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pyqtgraph/pyqtgraph/graphicsItems/ROI.py

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# -*- coding: utf-8 -*-
"""
ROI.py - Interactive graphics items for GraphicsView (ROI widgets)
Copyright 2010 Luke Campagnola
Distributed under MIT/X11 license. See license.txt for more infomation.
Implements a series of graphics items which display movable/scalable/rotatable shapes
for use as region-of-interest markers. ROI class automatically handles extraction
of array data from ImageItems.
The ROI class is meant to serve as the base for more specific types; see several examples
of how to build an ROI at the bottom of the file.
"""
from pyqtgraph.Qt import QtCore, QtGui
#if not hasattr(QtCore, 'Signal'):
#QtCore.Signal = QtCore.pyqtSignal
import numpy as np
from numpy.linalg import norm
import scipy.ndimage as ndimage
from pyqtgraph.Point import *
from pyqtgraph.SRTTransform import SRTTransform
from math import cos, sin
import pyqtgraph.functions as fn
from .GraphicsObject import GraphicsObject
from .UIGraphicsItem import UIGraphicsItem
__all__ = [
'ROI',
'TestROI', 'RectROI', 'EllipseROI', 'CircleROI', 'PolygonROI',
'LineROI', 'MultiLineROI', 'MultiRectROI', 'LineSegmentROI', 'PolyLineROI', 'SpiralROI',
]
def rectStr(r):
return "[%f, %f] + [%f, %f]" % (r.x(), r.y(), r.width(), r.height())
class ROI(GraphicsObject):
"""Generic region-of-interest widget.
Can be used for implementing many types of selection box with rotate/translate/scale handles.
Signals
----------------------- ----------------------------------------------------
sigRegionChangeFinished Emitted when the user stops dragging the ROI (or
one of its handles) or if the ROI is changed
programatically.
sigRegionChangeStarted Emitted when the user starts dragging the ROI (or
one of its handles).
sigRegionChanged Emitted any time the position of the ROI changes,
including while it is being dragged by the user.
sigHoverEvent Emitted when the mouse hovers over the ROI.
sigClicked Emitted when the user clicks on the ROI
sigRemoveRequested Emitted when the user selects 'remove' from the
ROI's context menu (if available).
----------------------- ----------------------------------------------------
"""
sigRegionChangeFinished = QtCore.Signal(object)
sigRegionChangeStarted = QtCore.Signal(object)
sigRegionChanged = QtCore.Signal(object)
sigHoverEvent = QtCore.Signal(object)
sigClicked = QtCore.Signal(object, object)
sigRemoveRequested = QtCore.Signal(object)
def __init__(self, pos, size=Point(1, 1), angle=0.0, invertible=False, maxBounds=None, snapSize=1.0, scaleSnap=False, translateSnap=False, rotateSnap=False, parent=None, pen=None, movable=True, removable=False):
#QObjectWorkaround.__init__(self)
GraphicsObject.__init__(self, parent)
self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
pos = Point(pos)
size = Point(size)
self.aspectLocked = False
self.translatable = movable
self.rotateAllowed = True
self.removable = removable
self.menu = None
self.freeHandleMoved = False ## keep track of whether free handles have moved since last change signal was emitted.
self.mouseHovering = False
if pen is None:
pen = (255, 255, 255)
self.setPen(pen)
self.handlePen = QtGui.QPen(QtGui.QColor(150, 255, 255))
self.handles = []
self.state = {'pos': Point(0,0), 'size': Point(1,1), 'angle': 0} ## angle is in degrees for ease of Qt integration
self.lastState = None
self.setPos(pos)
self.setAngle(angle)
self.setSize(size)
self.setZValue(10)
self.isMoving = False
self.handleSize = 5
self.invertible = invertible
self.maxBounds = maxBounds
self.snapSize = snapSize
self.translateSnap = translateSnap
self.rotateSnap = rotateSnap
self.scaleSnap = scaleSnap
#self.setFlag(self.ItemIsSelectable, True)
def getState(self):
return self.stateCopy()
def stateCopy(self):
sc = {}
sc['pos'] = Point(self.state['pos'])
sc['size'] = Point(self.state['size'])
sc['angle'] = self.state['angle']
return sc
def saveState(self):
"""Return the state of the widget in a format suitable for storing to disk. (Points are converted to tuple)"""
state = {}
state['pos'] = tuple(self.state['pos'])
state['size'] = tuple(self.state['size'])
state['angle'] = self.state['angle']
return state
def setState(self, state, update=True):
self.setPos(state['pos'], update=False)
self.setSize(state['size'], update=False)
self.setAngle(state['angle'], update=update)
def setZValue(self, z):
QtGui.QGraphicsItem.setZValue(self, z)
for h in self.handles:
h['item'].setZValue(z+1)
def parentBounds(self):
return self.mapToParent(self.boundingRect()).boundingRect()
def setPen(self, pen):
self.pen = fn.mkPen(pen)
self.currentPen = self.pen
self.update()
def size(self):
return self.getState()['size']
def pos(self):
return self.getState()['pos']
def angle(self):
return self.getState()['angle']
def setPos(self, pos, update=True, finish=True):
"""Set the position of the ROI (in the parent's coordinate system).
By default, this will cause both sigRegionChanged and sigRegionChangeFinished to be emitted.
If finish is False, then sigRegionChangeFinished will not be emitted. You can then use
stateChangeFinished() to cause the signal to be emitted after a series of state changes.
If update is False, the state change will be remembered but not processed and no signals
will be emitted. You can then use stateChanged() to complete the state change. This allows
multiple change functions to be called sequentially while minimizing processing overhead
and repeated signals. Setting update=False also forces finish=False.
"""
pos = Point(pos)
self.state['pos'] = pos
QtGui.QGraphicsItem.setPos(self, pos)
if update:
self.stateChanged(finish=finish)
def setSize(self, size, update=True, finish=True):
"""Set the size of the ROI. May be specified as a QPoint, Point, or list of two values.
See setPos() for an explanation of the update and finish arguments.
"""
size = Point(size)
self.prepareGeometryChange()
self.state['size'] = size
if update:
self.stateChanged(finish=finish)
def setAngle(self, angle, update=True, finish=True):
"""Set the angle of rotation (in degrees) for this ROI.
See setPos() for an explanation of the update and finish arguments.
"""
self.state['angle'] = angle
tr = QtGui.QTransform()
#tr.rotate(-angle * 180 / np.pi)
tr.rotate(angle)
self.setTransform(tr)
if update:
self.stateChanged(finish=finish)
def scale(self, s, center=[0,0], update=True, finish=True):
"""
Resize the ROI by scaling relative to *center*.
See setPos() for an explanation of the *update* and *finish* arguments.
"""
c = self.mapToParent(Point(center) * self.state['size'])
self.prepareGeometryChange()
newSize = self.state['size'] * s
c1 = self.mapToParent(Point(center) * newSize)
newPos = self.state['pos'] + c - c1
self.setSize(newSize, update=False)
self.setPos(newPos, update=update, finish=finish)
def translate(self, *args, **kargs):
"""
Move the ROI to a new position.
Accepts either (x, y, snap) or ([x,y], snap) as arguments
If the ROI is bounded and the move would exceed boundaries, then the ROI
is moved to the nearest acceptable position instead.
snap can be:
None (default): use self.translateSnap and self.snapSize to determine whether/how to snap
False: do not snap
Point(w,h) snap to rectangular grid with spacing (w,h)
True: snap using self.snapSize (and ignoring self.translateSnap)
Also accepts *update* and *finish* arguments (see setPos() for a description of these).
"""
if len(args) == 1:
pt = args[0]
else:
pt = args
newState = self.stateCopy()
newState['pos'] = newState['pos'] + pt
## snap position
#snap = kargs.get('snap', None)
#if (snap is not False) and not (snap is None and self.translateSnap is False):
snap = kargs.get('snap', None)
if snap is None:
snap = self.translateSnap
if snap is not False:
newState['pos'] = self.getSnapPosition(newState['pos'], snap=snap)
#d = ev.scenePos() - self.mapToScene(self.pressPos)
if self.maxBounds is not None:
r = self.stateRect(newState)
#r0 = self.sceneTransform().mapRect(self.boundingRect())
d = Point(0,0)
if self.maxBounds.left() > r.left():
d[0] = self.maxBounds.left() - r.left()
elif self.maxBounds.right() < r.right():
d[0] = self.maxBounds.right() - r.right()
if self.maxBounds.top() > r.top():
d[1] = self.maxBounds.top() - r.top()
elif self.maxBounds.bottom() < r.bottom():
d[1] = self.maxBounds.bottom() - r.bottom()
newState['pos'] += d
#self.state['pos'] = newState['pos']
update = kargs.get('update', True)
finish = kargs.get('finish', True)
self.setPos(newState['pos'], update=update, finish=finish)
#if 'update' not in kargs or kargs['update'] is True:
#self.stateChanged()
def rotate(self, angle, update=True, finish=True):
self.setAngle(self.angle()+angle, update=update, finish=finish)
def handleMoveStarted(self):
self.preMoveState = self.getState()
def addTranslateHandle(self, pos, axes=None, item=None, name=None, index=None):
pos = Point(pos)
return self.addHandle({'name': name, 'type': 't', 'pos': pos, 'item': item}, index=index)
def addFreeHandle(self, pos=None, axes=None, item=None, name=None, index=None):
if pos is not None:
pos = Point(pos)
return self.addHandle({'name': name, 'type': 'f', 'pos': pos, 'item': item}, index=index)
def addScaleHandle(self, pos, center, axes=None, item=None, name=None, lockAspect=False, index=None):
pos = Point(pos)
center = Point(center)
info = {'name': name, 'type': 's', 'center': center, 'pos': pos, 'item': item, 'lockAspect': lockAspect}
if pos.x() == center.x():
info['xoff'] = True
if pos.y() == center.y():
info['yoff'] = True
return self.addHandle(info, index=index)
def addRotateHandle(self, pos, center, item=None, name=None, index=None):
pos = Point(pos)
center = Point(center)
return self.addHandle({'name': name, 'type': 'r', 'center': center, 'pos': pos, 'item': item}, index=index)
def addScaleRotateHandle(self, pos, center, item=None, name=None, index=None):
pos = Point(pos)
center = Point(center)
if pos[0] != center[0] and pos[1] != center[1]:
raise Exception("Scale/rotate handles must have either the same x or y coordinate as their center point.")
return self.addHandle({'name': name, 'type': 'sr', 'center': center, 'pos': pos, 'item': item}, index=index)
def addRotateFreeHandle(self, pos, center, axes=None, item=None, name=None, index=None):
pos = Point(pos)
center = Point(center)
return self.addHandle({'name': name, 'type': 'rf', 'center': center, 'pos': pos, 'item': item}, index=index)
def addHandle(self, info, index=None):
## If a Handle was not supplied, create it now
if 'item' not in info or info['item'] is None:
h = Handle(self.handleSize, typ=info['type'], pen=self.handlePen, parent=self)
h.setPos(info['pos'] * self.state['size'])
info['item'] = h
else:
h = info['item']
if info['pos'] is None:
info['pos'] = h.pos()
## connect the handle to this ROI
#iid = len(self.handles)
h.connectROI(self)
if index is None:
self.handles.append(info)
else:
self.handles.insert(index, info)
h.setZValue(self.zValue()+1)
self.stateChanged()
return h
def indexOfHandle(self, handle):
if isinstance(handle, Handle):
index = [i for i, info in enumerate(self.handles) if info['item'] is handle]
if len(index) == 0:
raise Exception("Cannot remove handle; it is not attached to this ROI")
return index[0]
else:
return handle
def removeHandle(self, handle):
"""Remove a handle from this ROI. Argument may be either a Handle instance or the integer index of the handle."""
index = self.indexOfHandle(handle)
handle = self.handles[index]['item']
self.handles.pop(index)
handle.disconnectROI(self)
if len(handle.rois) == 0:
self.scene().removeItem(handle)
self.stateChanged()
def replaceHandle(self, oldHandle, newHandle):
"""Replace one handle in the ROI for another. This is useful when connecting multiple ROIs together.
*oldHandle* may be a Handle instance or the index of a handle."""
#print "========================="
#print "replace", oldHandle, newHandle
#print self
#print self.handles
#print "-----------------"
index = self.indexOfHandle(oldHandle)
info = self.handles[index]
self.removeHandle(index)
info['item'] = newHandle
info['pos'] = newHandle.pos()
self.addHandle(info, index=index)
#print self.handles
def checkRemoveHandle(self, handle):
## This is used when displaying a Handle's context menu to determine
## whether removing is allowed.
## Subclasses may wish to override this to disable the menu entry.
## Note: by default, handles are not user-removable even if this method returns True.
return True
def getLocalHandlePositions(self, index=None):
"""Returns the position of a handle in ROI coordinates"""
if index == None:
positions = []
for h in self.handles:
positions.append((h['name'], h['pos']))
return positions
else:
return (self.handles[index]['name'], self.handles[index]['pos'])
def getSceneHandlePositions(self, index=None):
if index == None:
positions = []
for h in self.handles:
positions.append((h['name'], h['item'].scenePos()))
return positions
else:
return (self.handles[index]['name'], self.handles[index]['item'].scenePos())
def getHandles(self):
return [h['item'] for h in self.handles]
def mapSceneToParent(self, pt):
return self.mapToParent(self.mapFromScene(pt))
def setSelected(self, s):
QtGui.QGraphicsItem.setSelected(self, s)
#print "select", self, s
if s:
for h in self.handles:
h['item'].show()
else:
for h in self.handles:
h['item'].hide()
def hoverEvent(self, ev):
hover = False
if not ev.isExit():
if self.translatable and ev.acceptDrags(QtCore.Qt.LeftButton):
hover=True
for btn in [QtCore.Qt.LeftButton, QtCore.Qt.RightButton, QtCore.Qt.MidButton]:
if int(self.acceptedMouseButtons() & btn) > 0 and ev.acceptClicks(btn):
hover=True
if self.contextMenuEnabled():
ev.acceptClicks(QtCore.Qt.RightButton)
if hover:
self.setMouseHover(True)
self.sigHoverEvent.emit(self)
ev.acceptClicks(QtCore.Qt.LeftButton) ## If the ROI is hilighted, we should accept all clicks to avoid confusion.
ev.acceptClicks(QtCore.Qt.RightButton)
ev.acceptClicks(QtCore.Qt.MidButton)
else:
self.setMouseHover(False)
def setMouseHover(self, hover):
## Inform the ROI that the mouse is(not) hovering over it
if self.mouseHovering == hover:
return
self.mouseHovering = hover
if hover:
self.currentPen = fn.mkPen(255, 255, 0)
else:
self.currentPen = self.pen
self.update()
def contextMenuEnabled(self):
return self.removable
def raiseContextMenu(self, ev):
if not self.contextMenuEnabled():
return
menu = self.getMenu()
menu = self.scene().addParentContextMenus(self, menu, ev)
pos = ev.screenPos()
menu.popup(QtCore.QPoint(pos.x(), pos.y()))
def getMenu(self):
if self.menu is None:
self.menu = QtGui.QMenu()
self.menu.setTitle("ROI")
remAct = QtGui.QAction("Remove ROI", self.menu)
remAct.triggered.connect(self.removeClicked)
self.menu.addAction(remAct)
self.menu.remAct = remAct
return self.menu
def removeClicked(self):
## Send remove event only after we have exited the menu event handler
self.removeTimer = QtCore.QTimer()
self.removeTimer.timeout.connect(lambda: self.sigRemoveRequested.emit(self))
self.removeTimer.start(0)
def mouseDragEvent(self, ev):
if ev.isStart():
#p = ev.pos()
#if not self.isMoving and not self.shape().contains(p):
#ev.ignore()
#return
if ev.button() == QtCore.Qt.LeftButton:
self.setSelected(True)
if self.translatable:
self.isMoving = True
self.preMoveState = self.getState()
self.cursorOffset = self.pos() - self.mapToParent(ev.buttonDownPos())
self.sigRegionChangeStarted.emit(self)
ev.accept()
else:
ev.ignore()
elif ev.isFinish():
if self.translatable:
if self.isMoving:
self.stateChangeFinished()
self.isMoving = False
return
if self.translatable and self.isMoving and ev.buttons() == QtCore.Qt.LeftButton:
snap = True if (ev.modifiers() & QtCore.Qt.ControlModifier) else None
newPos = self.mapToParent(ev.pos()) + self.cursorOffset
self.translate(newPos - self.pos(), snap=snap, finish=False)
def mouseClickEvent(self, ev):
if ev.button() == QtCore.Qt.RightButton and self.isMoving:
ev.accept()
self.cancelMove()
if ev.button() == QtCore.Qt.RightButton and self.contextMenuEnabled():
self.raiseContextMenu(ev)
ev.accept()
elif int(ev.button() & self.acceptedMouseButtons()) > 0:
ev.accept()
self.sigClicked.emit(self, ev)
else:
ev.ignore()
def cancelMove(self):
self.isMoving = False
self.setState(self.preMoveState)
#def pointDragEvent(self, pt, ev):
### just for handling drag start/stop.
### drag moves are handled through movePoint()
#if ev.isStart():
#self.isMoving = True
#self.preMoveState = self.getState()
#self.sigRegionChangeStarted.emit(self)
#elif ev.isFinish():
#self.isMoving = False
#self.sigRegionChangeFinished.emit(self)
#return
#def pointPressEvent(self, pt, ev):
##print "press"
#self.isMoving = True
#self.preMoveState = self.getState()
##self.emit(QtCore.SIGNAL('regionChangeStarted'), self)
#self.sigRegionChangeStarted.emit(self)
##self.pressPos = self.mapFromScene(ev.scenePos())
##self.pressHandlePos = self.handles[pt]['item'].pos()
#def pointReleaseEvent(self, pt, ev):
##print "release"
#self.isMoving = False
##self.emit(QtCore.SIGNAL('regionChangeFinished'), self)
#self.sigRegionChangeFinished.emit(self)
#def pointMoveEvent(self, pt, ev):
#self.movePoint(pt, ev.scenePos(), ev.modifiers())
def checkPointMove(self, handle, pos, modifiers):
"""When handles move, they must ask the ROI if the move is acceptable.
By default, this always returns True. Subclasses may wish override.
"""
return True
def movePoint(self, handle, pos, modifiers=QtCore.Qt.KeyboardModifier(), finish=True, coords='parent'):
## called by Handles when they are moved.
## pos is the new position of the handle in scene coords, as requested by the handle.
newState = self.stateCopy()
index = self.indexOfHandle(handle)
h = self.handles[index]
p0 = self.mapToParent(h['pos'] * self.state['size'])
p1 = Point(pos)
if coords == 'parent':
pass
elif coords == 'scene':
p1 = self.mapSceneToParent(p1)
else:
raise Exception("New point location must be given in either 'parent' or 'scene' coordinates.")
## transform p0 and p1 into parent's coordinates (same as scene coords if there is no parent). I forget why.
#p0 = self.mapSceneToParent(p0)
#p1 = self.mapSceneToParent(p1)
## Handles with a 'center' need to know their local position relative to the center point (lp0, lp1)
if 'center' in h:
c = h['center']
cs = c * self.state['size']
lp0 = self.mapFromParent(p0) - cs
lp1 = self.mapFromParent(p1) - cs
if h['type'] == 't':
snap = True if (modifiers & QtCore.Qt.ControlModifier) else None
#if self.translateSnap or ():
#snap = Point(self.snapSize, self.snapSize)
self.translate(p1-p0, snap=snap, update=False)
elif h['type'] == 'f':
newPos = self.mapFromParent(p1)
h['item'].setPos(newPos)
h['pos'] = newPos
self.freeHandleMoved = True
#self.sigRegionChanged.emit(self) ## should be taken care of by call to stateChanged()
elif h['type'] == 's':
## If a handle and its center have the same x or y value, we can't scale across that axis.
if h['center'][0] == h['pos'][0]:
lp1[0] = 0
if h['center'][1] == h['pos'][1]:
lp1[1] = 0
## snap
if self.scaleSnap or (modifiers & QtCore.Qt.ControlModifier):
lp1[0] = round(lp1[0] / self.snapSize) * self.snapSize
lp1[1] = round(lp1[1] / self.snapSize) * self.snapSize
## preserve aspect ratio (this can override snapping)
if h['lockAspect'] or (modifiers & QtCore.Qt.AltModifier):
#arv = Point(self.preMoveState['size']) -
lp1 = lp1.proj(lp0)
## determine scale factors and new size of ROI
hs = h['pos'] - c
if hs[0] == 0:
hs[0] = 1
if hs[1] == 0:
hs[1] = 1
newSize = lp1 / hs
## Perform some corrections and limit checks
if newSize[0] == 0:
newSize[0] = newState['size'][0]
if newSize[1] == 0:
newSize[1] = newState['size'][1]
if not self.invertible:
if newSize[0] < 0:
newSize[0] = newState['size'][0]
if newSize[1] < 0:
newSize[1] = newState['size'][1]
if self.aspectLocked:
newSize[0] = newSize[1]
## Move ROI so the center point occupies the same scene location after the scale
s0 = c * self.state['size']
s1 = c * newSize
cc = self.mapToParent(s0 - s1) - self.mapToParent(Point(0, 0))
## update state, do more boundary checks
newState['size'] = newSize
newState['pos'] = newState['pos'] + cc
if self.maxBounds is not None:
r = self.stateRect(newState)
if not self.maxBounds.contains(r):
return
self.setPos(newState['pos'], update=False)
self.setSize(newState['size'], update=False)
elif h['type'] in ['r', 'rf']:
if h['type'] == 'rf':
self.freeHandleMoved = True
if not self.rotateAllowed:
return
## If the handle is directly over its center point, we can't compute an angle.
if lp1.length() == 0 or lp0.length() == 0:
return
## determine new rotation angle, constrained if necessary
ang = newState['angle'] - lp0.angle(lp1)
if ang is None: ## this should never happen..
return
if self.rotateSnap or (modifiers & QtCore.Qt.ControlModifier):
ang = round(ang / 15.) * 15. ## 180/12 = 15
## create rotation transform
tr = QtGui.QTransform()
tr.rotate(ang)
## move ROI so that center point remains stationary after rotate
cc = self.mapToParent(cs) - (tr.map(cs) + self.state['pos'])
newState['angle'] = ang
newState['pos'] = newState['pos'] + cc
## check boundaries, update
if self.maxBounds is not None:
r = self.stateRect(newState)
if not self.maxBounds.contains(r):
return
#self.setTransform(tr)
self.setPos(newState['pos'], update=False)
self.setAngle(ang, update=False)
#self.state = newState
## If this is a free-rotate handle, its distance from the center may change.
if h['type'] == 'rf':
h['item'].setPos(self.mapFromScene(p1)) ## changes ROI coordinates of handle
elif h['type'] == 'sr':
if h['center'][0] == h['pos'][0]:
scaleAxis = 1
else:
scaleAxis = 0
if lp1.length() == 0 or lp0.length() == 0:
return
ang = newState['angle'] - lp0.angle(lp1)
if ang is None:
return
if self.rotateSnap or (modifiers & QtCore.Qt.ControlModifier):
#ang = round(ang / (np.pi/12.)) * (np.pi/12.)
ang = round(ang / 15.) * 15.
hs = abs(h['pos'][scaleAxis] - c[scaleAxis])
newState['size'][scaleAxis] = lp1.length() / hs
#if self.scaleSnap or (modifiers & QtCore.Qt.ControlModifier):
if self.scaleSnap: ## use CTRL only for angular snap here.
newState['size'][scaleAxis] = round(newState['size'][scaleAxis] / self.snapSize) * self.snapSize
if newState['size'][scaleAxis] == 0:
newState['size'][scaleAxis] = 1
c1 = c * newState['size']
tr = QtGui.QTransform()
tr.rotate(ang)
cc = self.mapToParent(cs) - (tr.map(c1) + self.state['pos'])
newState['angle'] = ang
newState['pos'] = newState['pos'] + cc
if self.maxBounds is not None:
r = self.stateRect(newState)
if not self.maxBounds.contains(r):
return
#self.setTransform(tr)
#self.setPos(newState['pos'], update=False)
#self.prepareGeometryChange()
#self.state = newState
self.setState(newState, update=False)
self.stateChanged(finish=finish)
def stateChanged(self, finish=True):
"""Process changes to the state of the ROI.
If there are any changes, then the positions of handles are updated accordingly
and sigRegionChanged is emitted. If finish is True, then
sigRegionChangeFinished will also be emitted."""
changed = False
if self.lastState is None:
changed = True
else:
for k in list(self.state.keys()):
if self.state[k] != self.lastState[k]:
changed = True
self.prepareGeometryChange()
if changed:
## Move all handles to match the current configuration of the ROI
for h in self.handles:
if h['item'] in self.childItems():
p = h['pos']
h['item'].setPos(h['pos'] * self.state['size'])
#else:
# trans = self.state['pos']-self.lastState['pos']
# h['item'].setPos(h['pos'] + h['item'].parentItem().mapFromParent(trans))
self.update()
self.sigRegionChanged.emit(self)
elif self.freeHandleMoved:
self.sigRegionChanged.emit(self)
self.freeHandleMoved = False
self.lastState = self.stateCopy()
if finish:
self.stateChangeFinished()
def stateChangeFinished(self):
self.sigRegionChangeFinished.emit(self)
def stateRect(self, state):
r = QtCore.QRectF(0, 0, state['size'][0], state['size'][1])
tr = QtGui.QTransform()
#tr.rotate(-state['angle'] * 180 / np.pi)
tr.rotate(-state['angle'])
r = tr.mapRect(r)
return r.adjusted(state['pos'][0], state['pos'][1], state['pos'][0], state['pos'][1])
def getSnapPosition(self, pos, snap=None):
## Given that pos has been requested, return the nearest snap-to position
## optionally, snap may be passed in to specify a rectangular snap grid.
## override this function for more interesting snap functionality..
if snap is None or snap is True:
if self.snapSize is None:
return pos
snap = Point(self.snapSize, self.snapSize)
return Point(
round(pos[0] / snap[0]) * snap[0],
round(pos[1] / snap[1]) * snap[1]
)
def boundingRect(self):
return QtCore.QRectF(0, 0, self.state['size'][0], self.state['size'][1]).normalized()
def paint(self, p, opt, widget):
p.save()
r = self.boundingRect()
p.setRenderHint(QtGui.QPainter.Antialiasing)
p.setPen(self.currentPen)
p.translate(r.left(), r.top())
p.scale(r.width(), r.height())
p.drawRect(0, 0, 1, 1)
p.restore()
def getArraySlice(self, data, img, axes=(0,1), returnSlice=True):
"""Return a tuple of slice objects that can be used to slice the region from data covered by this ROI.
Also returns the transform which maps the ROI into data coordinates.
If returnSlice is set to False, the function returns a pair of tuples with the values that would have
been used to generate the slice objects. ((ax0Start, ax0Stop), (ax1Start, ax1Stop))
If the slice can not be computed (usually because the scene/transforms are not properly
constructed yet), then the method returns None.
"""
#print "getArraySlice"
## Determine shape of array along ROI axes
dShape = (data.shape[axes[0]], data.shape[axes[1]])
#print " dshape", dShape
## Determine transform that maps ROI bounding box to image coordinates
try:
tr = self.sceneTransform() * fn.invertQTransform(img.sceneTransform())
except np.linalg.linalg.LinAlgError:
return None
## Modify transform to scale from image coords to data coords
#m = QtGui.QTransform()
tr.scale(float(dShape[0]) / img.width(), float(dShape[1]) / img.height())
#tr = tr * m
## Transform ROI bounds into data bounds
dataBounds = tr.mapRect(self.boundingRect())
#print " boundingRect:", self.boundingRect()
#print " dataBounds:", dataBounds
## Intersect transformed ROI bounds with data bounds
intBounds = dataBounds.intersect(QtCore.QRectF(0, 0, dShape[0], dShape[1]))
#print " intBounds:", intBounds
## Determine index values to use when referencing the array.
bounds = (
(int(min(intBounds.left(), intBounds.right())), int(1+max(intBounds.left(), intBounds.right()))),
(int(min(intBounds.bottom(), intBounds.top())), int(1+max(intBounds.bottom(), intBounds.top())))
)
#print " bounds:", bounds
if returnSlice:
## Create slice objects
sl = [slice(None)] * data.ndim
sl[axes[0]] = slice(*bounds[0])
sl[axes[1]] = slice(*bounds[1])
return tuple(sl), tr
else:
return bounds, tr
def getArrayRegion(self, data, img, axes=(0,1), returnMappedCoords=False, **kwds):
"""Use the position and orientation of this ROI relative to an imageItem to pull a slice from an array.
This method uses :func:`affineSlice <pyqtgraph.affineSlice>` to generate
the slice from *data* and uses :func:`getAffineSliceParams <pyqtgraph.ROI.getAffineSliceParams>` to determine the parameters to
pass to :func:`affineSlice <pyqtgraph.affineSlice>`.
If *returnMappedCoords* is True, then the method returns a tuple (result, coords)
such that coords is the set of coordinates used to interpolate values from the original
data, mapped into the parent coordinate system of the image. This is useful, when slicing
data from images that have been transformed, for determining the location of each value
in the sliced data.
All extra keyword arguments are passed to :func:`affineSlice <pyqtgraph.affineSlice>`.
"""
shape, vectors, origin = self.getAffineSliceParams(data, img, axes)
if not returnMappedCoords:
return fn.affineSlice(data, shape=shape, vectors=vectors, origin=origin, axes=axes, **kwds)
else:
kwds['returnCoords'] = True
result, coords = fn.affineSlice(data, shape=shape, vectors=vectors, origin=origin, axes=axes, **kwds)
#tr = fn.transformToArray(img.transform())[:2] ## remove perspective transform values
### separate translation from scale/rotate
#translate = tr[:,2]
#tr = tr[:,:2]
#tr = tr.reshape((2,2) + (1,)*(coords.ndim-1))
#coords = coords[np.newaxis, ...]
### map coordinates and return
#mapped = (tr*coords).sum(axis=0) ## apply scale/rotate
#mapped += translate.reshape((2,1,1))
mapped = fn.transformCoordinates(img.transform(), coords)
return result, mapped
### transpose data so x and y are the first 2 axes
#trAx = range(0, data.ndim)
#trAx.remove(axes[0])
#trAx.remove(axes[1])
#tr1 = tuple(axes) + tuple(trAx)
#arr = data.transpose(tr1)
### Determine the minimal area of the data we will need
#(dataBounds, roiDataTransform) = self.getArraySlice(data, img, returnSlice=False, axes=axes)
### Pad data boundaries by 1px if possible
#dataBounds = (
#(max(dataBounds[0][0]-1, 0), min(dataBounds[0][1]+1, arr.shape[0])),
#(max(dataBounds[1][0]-1, 0), min(dataBounds[1][1]+1, arr.shape[1]))
#)
### Extract minimal data from array
#arr1 = arr[dataBounds[0][0]:dataBounds[0][1], dataBounds[1][0]:dataBounds[1][1]]
### Update roiDataTransform to reflect this extraction
#roiDataTransform *= QtGui.QTransform().translate(-dataBounds[0][0], -dataBounds[1][0])
#### (roiDataTransform now maps from ROI coords to extracted data coords)
### Rotate array
#if abs(self.state['angle']) > 1e-5:
#arr2 = ndimage.rotate(arr1, self.state['angle'] * 180 / np.pi, order=1)
### update data transforms to reflect this rotation
#rot = QtGui.QTransform().rotate(self.state['angle'] * 180 / np.pi)
#roiDataTransform *= rot
### The rotation also causes a shift which must be accounted for:
#dataBound = QtCore.QRectF(0, 0, arr1.shape[0], arr1.shape[1])
#rotBound = rot.mapRect(dataBound)
#roiDataTransform *= QtGui.QTransform().translate(-rotBound.left(), -rotBound.top())
#else:
#arr2 = arr1
#### Shift off partial pixels
## 1. map ROI into current data space
#roiBounds = roiDataTransform.mapRect(self.boundingRect())
## 2. Determine amount to shift data
#shift = (int(roiBounds.left()) - roiBounds.left(), int(roiBounds.bottom()) - roiBounds.bottom())
#if abs(shift[0]) > 1e-6 or abs(shift[1]) > 1e-6:
## 3. pad array with 0s before shifting
#arr2a = np.zeros((arr2.shape[0]+2, arr2.shape[1]+2) + arr2.shape[2:], dtype=arr2.dtype)
#arr2a[1:-1, 1:-1] = arr2
## 4. shift array and udpate transforms
#arr3 = ndimage.shift(arr2a, shift + (0,)*(arr2.ndim-2), order=1)
#roiDataTransform *= QtGui.QTransform().translate(1+shift[0], 1+shift[1])
#else:
#arr3 = arr2
#### Extract needed region from rotated/shifted array
## 1. map ROI into current data space (round these values off--they should be exact integer values at this point)
#roiBounds = roiDataTransform.mapRect(self.boundingRect())
##print self, roiBounds.height()
##import traceback
##traceback.print_stack()
#roiBounds = QtCore.QRect(round(roiBounds.left()), round(roiBounds.top()), round(roiBounds.width()), round(roiBounds.height()))
##2. intersect ROI with data bounds
#dataBounds = roiBounds.intersect(QtCore.QRect(0, 0, arr3.shape[0], arr3.shape[1]))
##3. Extract data from array
#db = dataBounds
#bounds = (
#(db.left(), db.right()+1),
#(db.top(), db.bottom()+1)
#)
#arr4 = arr3[bounds[0][0]:bounds[0][1], bounds[1][0]:bounds[1][1]]
#### Create zero array in size of ROI
#arr5 = np.zeros((roiBounds.width(), roiBounds.height()) + arr4.shape[2:], dtype=arr4.dtype)
### Fill array with ROI data
#orig = Point(dataBounds.topLeft() - roiBounds.topLeft())
#subArr = arr5[orig[0]:orig[0]+arr4.shape[0], orig[1]:orig[1]+arr4.shape[1]]
#subArr[:] = arr4[:subArr.shape[0], :subArr.shape[1]]
### figure out the reverse transpose order
#tr2 = np.array(tr1)
#for i in range(0, len(tr2)):
#tr2[tr1[i]] = i
#tr2 = tuple(tr2)
### Untranspose array before returning
#return arr5.transpose(tr2)
def getAffineSliceParams(self, data, img, axes=(0,1)):
"""
Returns the parameters needed to use :func:`affineSlice <pyqtgraph.affineSlice>` to
extract a subset of *data* using this ROI and *img* to specify the subset.
See :func:`getArrayRegion <pyqtgraph.ROI.getArrayRegion>` for more information.
"""
if self.scene() is not img.scene():
raise Exception("ROI and target item must be members of the same scene.")
shape = self.state['size']
origin = self.mapToItem(img, QtCore.QPointF(0, 0))
## vx and vy point in the directions of the slice axes, but must be scaled properly
vx = self.mapToItem(img, QtCore.QPointF(1, 0)) - origin
vy = self.mapToItem(img, QtCore.QPointF(0, 1)) - origin
lvx = np.sqrt(vx.x()**2 + vx.y()**2)
lvy = np.sqrt(vy.x()**2 + vy.y()**2)
pxLen = img.width() / float(data.shape[axes[0]])
#img.width is number of pixels or width of item?
#need pxWidth and pxHeight instead of pxLen ?
sx = pxLen / lvx
sy = pxLen / lvy
vectors = ((vx.x()*sx, vx.y()*sx), (vy.x()*sy, vy.y()*sy))
shape = self.state['size']
shape = [abs(shape[0]/sx), abs(shape[1]/sy)]
origin = (origin.x(), origin.y())
return shape, vectors, origin
def getGlobalTransform(self, relativeTo=None):
"""Return global transformation (rotation angle+translation) required to move
from relative state to current state. If relative state isn't specified,
then we use the state of the ROI when mouse is pressed."""
if relativeTo == None:
relativeTo = self.preMoveState
st = self.getState()
## this is only allowed because we will be comparing the two
relativeTo['scale'] = relativeTo['size']
st['scale'] = st['size']
t1 = SRTTransform(relativeTo)
t2 = SRTTransform(st)
return t2/t1
#st = self.getState()
### rotation
#ang = (st['angle']-relativeTo['angle']) * 180. / 3.14159265358
#rot = QtGui.QTransform()
#rot.rotate(-ang)
### We need to come up with a universal transformation--one that can be applied to other objects
### such that all maintain alignment.
### More specifically, we need to turn the ROI's position and angle into
### a rotation _around the origin_ and a translation.
#p0 = Point(relativeTo['pos'])
### base position, rotated
#p1 = rot.map(p0)
#trans = Point(st['pos']) - p1
#return trans, ang
def applyGlobalTransform(self, tr):
st = self.getState()
st['scale'] = st['size']
st = SRTTransform(st)
st = (st * tr).saveState()
st['size'] = st['scale']
self.setState(st)
class Handle(UIGraphicsItem):
types = { ## defines number of sides, start angle for each handle type
't': (4, np.pi/4),
'f': (4, np.pi/4),
's': (4, 0),
'r': (12, 0),
'sr': (12, 0),
'rf': (12, 0),
}
sigClicked = QtCore.Signal(object, object) # self, event
sigRemoveRequested = QtCore.Signal(object) # self
def __init__(self, radius, typ=None, pen=(200, 200, 220), parent=None, deletable=False):
#print " create item with parent", parent
#self.bounds = QtCore.QRectF(-1e-10, -1e-10, 2e-10, 2e-10)
#self.setFlags(self.ItemIgnoresTransformations | self.ItemSendsScenePositionChanges)
self.rois = []
self.radius = radius
self.typ = typ
self.pen = fn.mkPen(pen)
self.currentPen = self.pen
self.pen.setWidth(0)
self.pen.setCosmetic(True)
self.isMoving = False
self.sides, self.startAng = self.types[typ]
self.buildPath()
self._shape = None
self.menu = self.buildMenu()
UIGraphicsItem.__init__(self, parent=parent)
self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
self.deletable = deletable
if deletable:
self.setAcceptedMouseButtons(QtCore.Qt.RightButton)
#self.updateShape()
self.setZValue(11)
def connectROI(self, roi):
### roi is the "parent" roi, i is the index of the handle in roi.handles
self.rois.append(roi)
def disconnectROI(self, roi):
self.rois.remove(roi)
#for i, r in enumerate(self.roi):
#if r[0] == roi:
#self.roi.pop(i)
#def close(self):
#for r in self.roi:
#r.removeHandle(self)
def setDeletable(self, b):
self.deletable = b
if b:
self.setAcceptedMouseButtons(self.acceptedMouseButtons() | QtCore.Qt.RightButton)
else:
self.setAcceptedMouseButtons(self.acceptedMouseButtons() & ~QtCore.Qt.RightButton)
def removeClicked(self):
self.sigRemoveRequested.emit(self)
def hoverEvent(self, ev):
hover = False
if not ev.isExit():
if ev.acceptDrags(QtCore.Qt.LeftButton):
hover=True
for btn in [QtCore.Qt.LeftButton, QtCore.Qt.RightButton, QtCore.Qt.MidButton]:
if int(self.acceptedMouseButtons() & btn) > 0 and ev.acceptClicks(btn):
hover=True
if hover:
self.currentPen = fn.mkPen(255, 255,0)
else:
self.currentPen = self.pen
self.update()
#if (not ev.isExit()) and ev.acceptDrags(QtCore.Qt.LeftButton):
#self.currentPen = fn.mkPen(255, 255,0)
#else:
#self.currentPen = self.pen
#self.update()
def mouseClickEvent(self, ev):
## right-click cancels drag
if ev.button() == QtCore.Qt.RightButton and self.isMoving:
self.isMoving = False ## prevents any further motion
self.movePoint(self.startPos, finish=True)
#for r in self.roi:
#r[0].cancelMove()
ev.accept()
elif int(ev.button() & self.acceptedMouseButtons()) > 0:
ev.accept()
if ev.button() == QtCore.Qt.RightButton and self.deletable:
self.raiseContextMenu(ev)
self.sigClicked.emit(self, ev)
else:
ev.ignore()
#elif self.deletable:
#ev.accept()
#self.raiseContextMenu(ev)
#else:
#ev.ignore()
def buildMenu(self):
menu = QtGui.QMenu()
menu.setTitle("Handle")
self.removeAction = menu.addAction("Remove handle", self.removeClicked)
return menu
def getMenu(self):
return self.menu
def getContextMenus(self, event):
return [self.menu]
def raiseContextMenu(self, ev):
menu = self.scene().addParentContextMenus(self, self.getMenu(), ev)
## Make sure it is still ok to remove this handle
removeAllowed = all([r.checkRemoveHandle(self) for r in self.rois])
self.removeAction.setEnabled(removeAllowed)
pos = ev.screenPos()
menu.popup(QtCore.QPoint(pos.x(), pos.y()))
def mouseDragEvent(self, ev):
if ev.button() != QtCore.Qt.LeftButton:
return
ev.accept()
## Inform ROIs that a drag is happening
## note: the ROI is informed that the handle has moved using ROI.movePoint
## this is for other (more nefarious) purposes.
#for r in self.roi:
#r[0].pointDragEvent(r[1], ev)
if ev.isFinish():
if self.isMoving:
for r in self.rois:
r.stateChangeFinished()
self.isMoving = False
elif ev.isStart():
for r in self.rois:
r.handleMoveStarted()
self.isMoving = True
self.startPos = self.scenePos()
self.cursorOffset = self.scenePos() - ev.buttonDownScenePos()
if self.isMoving: ## note: isMoving may become False in mid-drag due to right-click.
pos = ev.scenePos() + self.cursorOffset
self.movePoint(pos, ev.modifiers(), finish=False)
def movePoint(self, pos, modifiers=QtCore.Qt.KeyboardModifier(), finish=True):
for r in self.rois:
if not r.checkPointMove(self, pos, modifiers):
return
#print "point moved; inform %d ROIs" % len(self.roi)
# A handle can be used by multiple ROIs; tell each to update its handle position
for r in self.rois:
r.movePoint(self, pos, modifiers, finish=finish, coords='scene')
def buildPath(self):
size = self.radius
self.path = QtGui.QPainterPath()
ang = self.startAng
dt = 2*np.pi / self.sides
for i in range(0, self.sides+1):
x = size * cos(ang)
y = size * sin(ang)
ang += dt
if i == 0:
self.path.moveTo(x, y)
else:
self.path.lineTo(x, y)
def paint(self, p, opt, widget):
### determine rotation of transform
#m = self.sceneTransform()
##mi = m.inverted()[0]
#v = m.map(QtCore.QPointF(1, 0)) - m.map(QtCore.QPointF(0, 0))
#va = np.arctan2(v.y(), v.x())
### Determine length of unit vector in painter's coords
##size = mi.map(Point(self.radius, self.radius)) - mi.map(Point(0, 0))
##size = (size.x()*size.x() + size.y() * size.y()) ** 0.5
#size = self.radius
#bounds = QtCore.QRectF(-size, -size, size*2, size*2)
#if bounds != self.bounds:
#self.bounds = bounds
#self.prepareGeometryChange()
p.setRenderHints(p.Antialiasing, True)
p.setPen(self.currentPen)
#p.rotate(va * 180. / 3.1415926)
#p.drawPath(self.path)
p.drawPath(self.shape())
#ang = self.startAng + va
#dt = 2*np.pi / self.sides
#for i in range(0, self.sides):
#x1 = size * cos(ang)
#y1 = size * sin(ang)
#x2 = size * cos(ang+dt)
#y2 = size * sin(ang+dt)
#ang += dt
#p.drawLine(Point(x1, y1), Point(x2, y2))
def shape(self):
if self._shape is None:
s = self.generateShape()
if s is None:
return self.path
self._shape = s
self.prepareGeometryChange() ## beware--this can cause the view to adjust, which would immediately invalidate the shape.
return self._shape
def boundingRect(self):
#print 'roi:', self.roi
s1 = self.shape()
#print " s1:", s1
#s2 = self.shape()
#print " s2:", s2
return self.shape().boundingRect()
def generateShape(self):
## determine rotation of transform
#m = self.sceneTransform() ## Qt bug: do not access sceneTransform() until we know this object has a scene.
#mi = m.inverted()[0]
dt = self.deviceTransform()
if dt is None:
self._shape = self.path
return None
v = dt.map(QtCore.QPointF(1, 0)) - dt.map(QtCore.QPointF(0, 0))
va = np.arctan2(v.y(), v.x())
dti = fn.invertQTransform(dt)
devPos = dt.map(QtCore.QPointF(0,0))
tr = QtGui.QTransform()
tr.translate(devPos.x(), devPos.y())
tr.rotate(va * 180. / 3.1415926)
return dti.map(tr.map(self.path))
def viewRangeChanged(self):
GraphicsObject.viewRangeChanged(self)
self._shape = None ## invalidate shape, recompute later if requested.
#self.updateShape()
#def itemChange(self, change, value):
#if change == self.ItemScenePositionHasChanged:
#self.updateShape()
class TestROI(ROI):
def __init__(self, pos, size, **args):
#QtGui.QGraphicsRectItem.__init__(self, pos[0], pos[1], size[0], size[1])
ROI.__init__(self, pos, size, **args)
#self.addTranslateHandle([0, 0])
self.addTranslateHandle([0.5, 0.5])
self.addScaleHandle([1, 1], [0, 0])
self.addScaleHandle([0, 0], [1, 1])
self.addScaleRotateHandle([1, 0.5], [0.5, 0.5])
self.addScaleHandle([0.5, 1], [0.5, 0.5])
self.addRotateHandle([1, 0], [0, 0])
self.addRotateHandle([0, 1], [1, 1])
class RectROI(ROI):
def __init__(self, pos, size, centered=False, sideScalers=False, **args):
#QtGui.QGraphicsRectItem.__init__(self, 0, 0, size[0], size[1])
ROI.__init__(self, pos, size, **args)
if centered:
center = [0.5, 0.5]
else:
center = [0, 0]
#self.addTranslateHandle(center)
self.addScaleHandle([1, 1], center)
if sideScalers:
self.addScaleHandle([1, 0.5], [center[0], 0.5])
self.addScaleHandle([0.5, 1], [0.5, center[1]])
class LineROI(ROI):
def __init__(self, pos1, pos2, width, **args):
pos1 = Point(pos1)
pos2 = Point(pos2)
d = pos2-pos1
l = d.length()
ang = Point(1, 0).angle(d)
ra = ang * np.pi / 180.
c = Point(-width/2. * sin(ra), -width/2. * cos(ra))
pos1 = pos1 + c
ROI.__init__(self, pos1, size=Point(l, width), angle=ang, **args)
self.addScaleRotateHandle([0, 0.5], [1, 0.5])
self.addScaleRotateHandle([1, 0.5], [0, 0.5])
self.addScaleHandle([0.5, 1], [0.5, 0.5])
class MultiRectROI(QtGui.QGraphicsObject):
"""
Chain of rectangular ROIs connected by handles.
This is generally used to mark a curved path through
an image similarly to PolyLineROI. It differs in that each segment
of the chain is rectangular instead of linear and thus has width.
"""
sigRegionChangeFinished = QtCore.Signal(object)
sigRegionChangeStarted = QtCore.Signal(object)
sigRegionChanged = QtCore.Signal(object)
def __init__(self, points, width, pen=None, **args):
QtGui.QGraphicsObject.__init__(self)
self.pen = pen
self.roiArgs = args
self.lines = []
if len(points) < 2:
raise Exception("Must start with at least 2 points")
## create first segment
self.addSegment(points[1], connectTo=points[0], scaleHandle=True)
## create remaining segments
for p in points[2:]:
self.addSegment(p)
def paint(self, *args):
pass
def boundingRect(self):
return QtCore.QRectF()
def roiChangedEvent(self):
w = self.lines[0].state['size'][1]
for l in self.lines[1:]:
w0 = l.state['size'][1]
if w == w0:
continue
l.scale([1.0, w/w0], center=[0.5,0.5])
self.sigRegionChanged.emit(self)
def roiChangeStartedEvent(self):
self.sigRegionChangeStarted.emit(self)
def roiChangeFinishedEvent(self):
self.sigRegionChangeFinished.emit(self)
def getHandlePositions(self):
"""Return the positions of all handles in local coordinates."""
pos = [self.mapFromScene(self.lines[0].getHandles()[0].scenePos())]
for l in self.lines:
pos.append(self.mapFromScene(l.getHandles()[1].scenePos()))
return pos
def getArrayRegion(self, arr, img=None, axes=(0,1)):
rgns = []
for l in self.lines:
rgn = l.getArrayRegion(arr, img, axes=axes)
if rgn is None:
continue
#return None
rgns.append(rgn)
#print l.state['size']
## make sure orthogonal axis is the same size
## (sometimes fp errors cause differences)
ms = min([r.shape[axes[1]] for r in rgns])
sl = [slice(None)] * rgns[0].ndim
sl[axes[1]] = slice(0,ms)
rgns = [r[sl] for r in rgns]
#print [r.shape for r in rgns], axes
return np.concatenate(rgns, axis=axes[0])
def addSegment(self, pos=(0,0), scaleHandle=False, connectTo=None):
"""
Add a new segment to the ROI connecting from the previous endpoint to *pos*.
(pos is specified in the parent coordinate system of the MultiRectROI)
"""
## by default, connect to the previous endpoint
if connectTo is None:
connectTo = self.lines[-1].getHandles()[1]
## create new ROI
newRoi = ROI((0,0), [1, 5], parent=self, pen=self.pen, **self.roiArgs)
self.lines.append(newRoi)
## Add first SR handle
if isinstance(connectTo, Handle):
self.lines[-1].addScaleRotateHandle([0, 0.5], [1, 0.5], item=connectTo)
newRoi.movePoint(connectTo, connectTo.scenePos(), coords='scene')
else:
h = self.lines[-1].addScaleRotateHandle([0, 0.5], [1, 0.5])
newRoi.movePoint(h, connectTo, coords='scene')
## add second SR handle
h = self.lines[-1].addScaleRotateHandle([1, 0.5], [0, 0.5])
newRoi.movePoint(h, pos)
## optionally add scale handle (this MUST come after the two SR handles)
if scaleHandle:
newRoi.addScaleHandle([0.5, 1], [0.5, 0.5])
newRoi.translatable = False
newRoi.sigRegionChanged.connect(self.roiChangedEvent)
newRoi.sigRegionChangeStarted.connect(self.roiChangeStartedEvent)
newRoi.sigRegionChangeFinished.connect(self.roiChangeFinishedEvent)
self.sigRegionChanged.emit(self)
def removeSegment(self, index=-1):
"""Remove a segment from the ROI."""
roi = self.lines[index]
self.lines.pop(index)
self.scene().removeItem(roi)
roi.sigRegionChanged.disconnect(self.roiChangedEvent)
roi.sigRegionChangeStarted.disconnect(self.roiChangeStartedEvent)
roi.sigRegionChangeFinished.disconnect(self.roiChangeFinishedEvent)
self.sigRegionChanged.emit(self)
class MultiLineROI(MultiRectROI):
def __init__(self, *args, **kwds):
MultiRectROI.__init__(self, *args, **kwds)
print("Warning: MultiLineROI has been renamed to MultiRectROI. (and MultiLineROI may be redefined in the future)")
class EllipseROI(ROI):
def __init__(self, pos, size, **args):
#QtGui.QGraphicsRectItem.__init__(self, 0, 0, size[0], size[1])
ROI.__init__(self, pos, size, **args)
self.addRotateHandle([1.0, 0.5], [0.5, 0.5])
self.addScaleHandle([0.5*2.**-0.5 + 0.5, 0.5*2.**-0.5 + 0.5], [0.5, 0.5])
def paint(self, p, opt, widget):
r = self.boundingRect()
p.setRenderHint(QtGui.QPainter.Antialiasing)
p.setPen(self.currentPen)
p.scale(r.width(), r.height())## workaround for GL bug
r = QtCore.QRectF(r.x()/r.width(), r.y()/r.height(), 1,1)
p.drawEllipse(r)
def getArrayRegion(self, arr, img=None):
arr = ROI.getArrayRegion(self, arr, img)
if arr is None or arr.shape[0] == 0 or arr.shape[1] == 0:
return None
w = arr.shape[0]
h = arr.shape[1]
## generate an ellipsoidal mask
mask = np.fromfunction(lambda x,y: (((x+0.5)/(w/2.)-1)**2+ ((y+0.5)/(h/2.)-1)**2)**0.5 < 1, (w, h))
return arr * mask
def shape(self):
self.path = QtGui.QPainterPath()
self.path.addEllipse(self.boundingRect())
return self.path
class CircleROI(EllipseROI):
def __init__(self, pos, size, **args):
ROI.__init__(self, pos, size, **args)
self.aspectLocked = True
#self.addTranslateHandle([0.5, 0.5])
self.addScaleHandle([0.5*2.**-0.5 + 0.5, 0.5*2.**-0.5 + 0.5], [0.5, 0.5])
class PolygonROI(ROI):
## deprecated. Use PloyLineROI instead.
def __init__(self, positions, pos=None, **args):
if pos is None:
pos = [0,0]
ROI.__init__(self, pos, [1,1], **args)
#ROI.__init__(self, positions[0])
for p in positions:
self.addFreeHandle(p)
self.setZValue(1000)
print("Warning: PolygonROI is deprecated. Use PolyLineROI instead.")
def listPoints(self):
return [p['item'].pos() for p in self.handles]
#def movePoint(self, *args, **kargs):
#ROI.movePoint(self, *args, **kargs)
#self.prepareGeometryChange()
#for h in self.handles:
#h['pos'] = h['item'].pos()
def paint(self, p, *args):
p.setRenderHint(QtGui.QPainter.Antialiasing)
p.setPen(self.currentPen)
for i in range(len(self.handles)):
h1 = self.handles[i]['item'].pos()
h2 = self.handles[i-1]['item'].pos()
p.drawLine(h1, h2)
def boundingRect(self):
r = QtCore.QRectF()
for h in self.handles:
r |= self.mapFromItem(h['item'], h['item'].boundingRect()).boundingRect() ## |= gives the union of the two QRectFs
return r
def shape(self):
p = QtGui.QPainterPath()
p.moveTo(self.handles[0]['item'].pos())
for i in range(len(self.handles)):
p.lineTo(self.handles[i]['item'].pos())
return p
def stateCopy(self):
sc = {}
sc['pos'] = Point(self.state['pos'])
sc['size'] = Point(self.state['size'])
sc['angle'] = self.state['angle']
#sc['handles'] = self.handles
return sc
class PolyLineROI(ROI):
"""Container class for multiple connected LineSegmentROIs. Responsible for adding new
line segments, and for translation/(rotation?) of multiple lines together."""
def __init__(self, positions, closed=False, pos=None, **args):
if pos is None:
pos = [0,0]
ROI.__init__(self, pos, size=[1,1], **args)
self.closed = closed
self.segments = []
for p in positions:
self.addFreeHandle(p)
start = -1 if self.closed else 0
for i in range(start, len(self.handles)-1):
self.addSegment(self.handles[i]['item'], self.handles[i+1]['item'])
def addSegment(self, h1, h2, index=None):
seg = LineSegmentROI(handles=(h1, h2), pen=self.pen, parent=self, movable=False)
if index is None:
self.segments.append(seg)
else:
self.segments.insert(index, seg)
seg.sigClicked.connect(self.segmentClicked)
seg.setAcceptedMouseButtons(QtCore.Qt.LeftButton)
seg.setZValue(self.zValue()+1)
for h in seg.handles:
h['item'].setDeletable(True)
h['item'].setAcceptedMouseButtons(h['item'].acceptedMouseButtons() | QtCore.Qt.LeftButton) ## have these handles take left clicks too, so that handles cannot be added on top of other handles
def setMouseHover(self, hover):
## Inform all the ROI's segments that the mouse is(not) hovering over it
ROI.setMouseHover(self, hover)
for s in self.segments:
s.setMouseHover(hover)
def addHandle(self, info, index=None):
h = ROI.addHandle(self, info, index=index)
h.sigRemoveRequested.connect(self.removeHandle)
return h
def segmentClicked(self, segment, ev=None, pos=None): ## pos should be in this item's coordinate system
if ev != None:
pos = segment.mapToParent(ev.pos())
elif pos != None:
pos = pos
else:
raise Exception("Either an event or a position must be given.")
h1 = segment.handles[0]['item']
h2 = segment.handles[1]['item']
i = self.segments.index(segment)
h3 = self.addFreeHandle(pos, index=self.indexOfHandle(h2))
self.addSegment(h3, h2, index=i+1)
segment.replaceHandle(h2, h3)
def removeHandle(self, handle, updateSegments=True):
ROI.removeHandle(self, handle)
handle.sigRemoveRequested.disconnect(self.removeHandle)
if not updateSegments:
return
segments = handle.rois[:]
if len(segments) == 1:
self.removeSegment(segments[0])
else:
handles = [h['item'] for h in segments[1].handles]
handles.remove(handle)
segments[0].replaceHandle(handle, handles[0])
self.removeSegment(segments[1])
def removeSegment(self, seg):
for handle in seg.handles[:]:
seg.removeHandle(handle['item'])
self.segments.remove(seg)
seg.sigClicked.disconnect(self.segmentClicked)
self.scene().removeItem(seg)
def checkRemoveHandle(self, h):
## called when a handle is about to display its context menu
if self.closed:
return len(self.handles) > 3
else:
return len(self.handles) > 2
def paint(self, p, *args):
#for s in self.segments:
#s.update()
#p.setPen(self.currentPen)
#p.setPen(fn.mkPen('w'))
#p.drawRect(self.boundingRect())
#p.drawPath(self.shape())
pass
def boundingRect(self):
return self.shape().boundingRect()
#r = QtCore.QRectF()
#for h in self.handles:
#r |= self.mapFromItem(h['item'], h['item'].boundingRect()).boundingRect() ## |= gives the union of the two QRectFs
#return r
def shape(self):
p = QtGui.QPainterPath()
if len(self.handles) == 0:
return p
p.moveTo(self.handles[0]['item'].pos())
for i in range(len(self.handles)):
p.lineTo(self.handles[i]['item'].pos())
p.lineTo(self.handles[0]['item'].pos())
return p
def getArrayRegion(self, data, img, axes=(0,1), returnMappedCoords=False, **kwds):
sl = self.getArraySlice(data, img, axes=(0,1))
if sl is None:
return None
sliced = data[sl[0]]
im = QtGui.QImage(sliced.shape[axes[0]], sliced.shape[axes[1]], QtGui.QImage.Format_ARGB32)
im.fill(0x0)
p = QtGui.QPainter(im)
p.setPen(fn.mkPen(None))
p.setBrush(fn.mkBrush('w'))
p.setTransform(self.itemTransform(img)[0])
bounds = self.mapRectToItem(img, self.boundingRect())
p.translate(-bounds.left(), -bounds.top())
p.drawPath(self.shape())
p.end()
mask = fn.imageToArray(im)[:,:,0].astype(float) / 255.
shape = [1] * data.ndim
shape[axes[0]] = sliced.shape[axes[0]]
shape[axes[1]] = sliced.shape[axes[1]]
return sliced * mask.reshape(shape)
class LineSegmentROI(ROI):
"""
ROI subclass with two freely-moving handles defining a line.
"""
def __init__(self, positions=(None, None), pos=None, handles=(None,None), **args):
if pos is None:
pos = [0,0]
ROI.__init__(self, pos, [1,1], **args)
#ROI.__init__(self, positions[0])
if len(positions) > 2:
raise Exception("LineSegmentROI must be defined by exactly 2 positions. For more points, use PolyLineROI.")
for i, p in enumerate(positions):
self.addFreeHandle(p, item=handles[i])
def listPoints(self):
return [p['item'].pos() for p in self.handles]
def paint(self, p, *args):
p.setRenderHint(QtGui.QPainter.Antialiasing)
p.setPen(self.currentPen)
h1 = self.handles[0]['item'].pos()
h2 = self.handles[1]['item'].pos()
p.drawLine(h1, h2)
def boundingRect(self):
return self.shape().boundingRect()
def shape(self):
p = QtGui.QPainterPath()
h1 = self.handles[0]['item'].pos()
h2 = self.handles[1]['item'].pos()
dh = h2-h1
if dh.length() == 0:
return p
pxv = self.pixelVectors(dh)[1]
if pxv is None:
return p
pxv *= 4
p.moveTo(h1+pxv)
p.lineTo(h2+pxv)
p.lineTo(h2-pxv)
p.lineTo(h1-pxv)
p.lineTo(h1+pxv)
return p
def getArrayRegion(self, data, img, axes=(0,1)):
"""
Use the position of this ROI relative to an imageItem to pull a slice from an array.
Since this pulls 1D data from a 2D coordinate system, the return value will have ndim = data.ndim-1
"""
imgPts = [self.mapToItem(img, h['item'].pos()) for h in self.handles]
rgns = []
for i in range(len(imgPts)-1):
d = Point(imgPts[i+1] - imgPts[i])
o = Point(imgPts[i])
r = fn.affineSlice(data, shape=(int(d.length()),), vectors=[Point(d.norm())], origin=o, axes=axes, order=1)
rgns.append(r)
return np.concatenate(rgns, axis=axes[0])
class SpiralROI(ROI):
def __init__(self, pos=None, size=None, **args):
if size == None:
size = [100e-6,100e-6]
if pos == None:
pos = [0,0]
ROI.__init__(self, pos, size, **args)
self.translateSnap = False
self.addFreeHandle([0.25,0], name='a')
self.addRotateFreeHandle([1,0], [0,0], name='r')
#self.getRadius()
#QtCore.connect(self, QtCore.SIGNAL('regionChanged'), self.
def getRadius(self):
radius = Point(self.handles[1]['item'].pos()).length()
#r2 = radius[1]
#r3 = r2[0]
return radius
def boundingRect(self):
r = self.getRadius()
return QtCore.QRectF(-r*1.1, -r*1.1, 2.2*r, 2.2*r)
#return self.bounds
#def movePoint(self, *args, **kargs):
#ROI.movePoint(self, *args, **kargs)
#self.prepareGeometryChange()
#for h in self.handles:
#h['pos'] = h['item'].pos()/self.state['size'][0]
def stateChanged(self, finish=True):
ROI.stateChanged(self, finish=finish)
if len(self.handles) > 1:
self.path = QtGui.QPainterPath()
h0 = Point(self.handles[0]['item'].pos()).length()
a = h0/(2.0*np.pi)
theta = 30.0*(2.0*np.pi)/360.0
self.path.moveTo(QtCore.QPointF(a*theta*cos(theta), a*theta*sin(theta)))
x0 = a*theta*cos(theta)
y0 = a*theta*sin(theta)
radius = self.getRadius()
theta += 20.0*(2.0*np.pi)/360.0
i = 0
while Point(x0, y0).length() < radius and i < 1000:
x1 = a*theta*cos(theta)
y1 = a*theta*sin(theta)
self.path.lineTo(QtCore.QPointF(x1,y1))
theta += 20.0*(2.0*np.pi)/360.0
x0 = x1
y0 = y1
i += 1
return self.path
def shape(self):
p = QtGui.QPainterPath()
p.addEllipse(self.boundingRect())
return p
def paint(self, p, *args):
p.setRenderHint(QtGui.QPainter.Antialiasing)
#path = self.shape()
p.setPen(self.currentPen)
p.drawPath(self.path)
p.setPen(QtGui.QPen(QtGui.QColor(255,0,0)))
p.drawPath(self.shape())
p.setPen(QtGui.QPen(QtGui.QColor(0,0,255)))
p.drawRect(self.boundingRect())
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