448 lines
16 KiB
Python
448 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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"""
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GraphicsView.py - Extension of QGraphicsView
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Copyright 2010 Luke Campagnola
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Distributed under MIT/X11 license. See license.txt for more infomation.
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"""
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from PyQt4 import QtCore, QtGui, QtOpenGL, QtSvg
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#from numpy import vstack
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#import time
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from Point import *
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#from vector import *
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import sys
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class GraphicsView(QtGui.QGraphicsView):
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def __init__(self, parent=None, useOpenGL=True):
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"""Re-implementation of QGraphicsView that removes scrollbars and allows unambiguous control of the
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viewed coordinate range. Also automatically creates a QGraphicsScene and a central QGraphicsWidget
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that is automatically scaled to the full view geometry.
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By default, the view coordinate system matches the widget's pixel coordinates and
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automatically updates when the view is resized. This can be overridden by setting
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autoPixelRange=False. The exact visible range can be set with setRange().
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The view can be panned using the middle mouse button and scaled using the right mouse button if
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enabled via enableMouse()."""
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QtGui.QGraphicsView.__init__(self, parent)
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if 'linux' in sys.platform: ## linux has bugs in opengl implementation
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useOpenGL = False
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self.useOpenGL(useOpenGL)
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palette = QtGui.QPalette()
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brush = QtGui.QBrush(QtGui.QColor(0,0,0))
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brush.setStyle(QtCore.Qt.SolidPattern)
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palette.setBrush(QtGui.QPalette.Active,QtGui.QPalette.Base,brush)
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brush = QtGui.QBrush(QtGui.QColor(0,0,0))
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brush.setStyle(QtCore.Qt.SolidPattern)
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palette.setBrush(QtGui.QPalette.Inactive,QtGui.QPalette.Base,brush)
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brush = QtGui.QBrush(QtGui.QColor(244,244,244))
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brush.setStyle(QtCore.Qt.SolidPattern)
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palette.setBrush(QtGui.QPalette.Disabled,QtGui.QPalette.Base,brush)
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self.setPalette(palette)
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self.setProperty("cursor",QtCore.QVariant(QtCore.Qt.ArrowCursor))
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self.setFocusPolicy(QtCore.Qt.StrongFocus)
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self.setFrameShape(QtGui.QFrame.NoFrame)
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self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
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self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
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self.setTransformationAnchor(QtGui.QGraphicsView.NoAnchor)
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self.setResizeAnchor(QtGui.QGraphicsView.AnchorViewCenter)
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#self.setResizeAnchor(QtGui.QGraphicsView.NoAnchor)
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self.setViewportUpdateMode(QtGui.QGraphicsView.SmartViewportUpdate)
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self.setSceneRect(QtCore.QRectF(-1e10, -1e10, 2e10, 2e10))
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#self.setSceneRect(1, 1, 0, 0) ## Set an empty (but non-zero) scene rect so that the view doesn't try to automatically update for us.
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#self.setInteractive(False)
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self.lockedViewports = []
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self.lastMousePos = None
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#self.setMouseTracking(False)
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self.aspectLocked = False
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self.yInverted = True
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self.range = QtCore.QRectF(0, 0, 1, 1)
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self.autoPixelRange = True
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self.currentItem = None
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self.clearMouse()
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self.updateMatrix()
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self.sceneObj = QtGui.QGraphicsScene()
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self.setScene(self.sceneObj)
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self.centralWidget = None
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self.setCentralItem(QtGui.QGraphicsWidget())
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self.mouseEnabled = False
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self.scaleCenter = False ## should scaling center around view center (True) or mouse click (False)
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self.clickAccepted = False
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def useOpenGL(self, b=True):
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if b:
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v = QtOpenGL.QGLWidget()
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else:
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v = QtGui.QWidget()
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#v.setStyleSheet("background-color: #000000;")
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self.setViewport(v)
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def keyPressEvent(self, ev):
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ev.ignore()
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def setCentralItem(self, item):
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if self.centralWidget is not None:
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self.scene().removeItem(self.centralWidget)
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self.centralWidget = item
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self.sceneObj.addItem(item)
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def addItem(self, *args):
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return self.scene().addItem(*args)
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def removeItem(self, *args):
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return self.scene().removeItem(*args)
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def enableMouse(self, b=True):
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self.mouseEnabled = b
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self.autoPixelRange = (not b)
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def clearMouse(self):
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self.mouseTrail = []
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self.lastButtonReleased = None
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def resizeEvent(self, ev):
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if self.autoPixelRange:
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self.range = QtCore.QRectF(0, 0, self.size().width(), self.size().height())
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self.setRange(self.range, padding=0, disableAutoPixel=False)
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self.updateMatrix()
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def updateMatrix(self, propagate=True):
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#print "udpateMatrix:"
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translate = Point(self.range.center())
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if self.range.width() == 0 or self.range.height() == 0:
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return
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scale = Point(self.size().width()/self.range.width(), self.size().height()/self.range.height())
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m = QtGui.QMatrix()
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## First center the viewport at 0
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self.resetMatrix()
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center = self.viewportTransform().inverted()[0].map(Point(self.width()/2., self.height()/2.))
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if self.yInverted:
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m.translate(center.x(), center.y())
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#print " inverted; translate", center.x(), center.y()
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else:
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m.translate(center.x(), -center.y())
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#print " not inverted; translate", center.x(), -center.y()
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## Now scale and translate properly
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if self.aspectLocked:
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scale = Point(scale.min())
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if not self.yInverted:
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scale = scale * Point(1, -1)
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m.scale(scale[0], scale[1])
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#print " scale:", scale
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st = translate
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m.translate(-st[0], -st[1])
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#print " translate:", st
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self.setMatrix(m)
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self.currentScale = scale
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self.emit(QtCore.SIGNAL('viewChanged'), self.range)
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if propagate:
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for v in self.lockedViewports:
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v.setXRange(self.range, padding=0)
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def visibleRange(self):
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"""Return the boundaries of the view in scene coordinates"""
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## easier to just return self.range ?
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r = QtCore.QRectF(self.rect())
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return self.viewportTransform().inverted()[0].mapRect(r)
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def translate(self, dx, dy):
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self.range.adjust(dx, dy, dx, dy)
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self.updateMatrix()
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def scale(self, sx, sy, center=None):
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scale = [sx, sy]
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if self.aspectLocked:
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scale[0] = scale[1]
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#adj = (self.range.width()*0.5*(1.0-(1.0/scale[0])), self.range.height()*0.5*(1.0-(1.0/scale[1])))
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#print "======\n", scale, adj
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#print self.range
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#self.range.adjust(adj[0], adj[1], -adj[0], -adj[1])
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#print self.range
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if self.scaleCenter:
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center = None
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if center is None:
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center = self.range.center()
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w = self.range.width() / scale[0]
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h = self.range.height() / scale[1]
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self.range = QtCore.QRectF(center.x() - (center.x()-self.range.left()) / scale[0], center.y() - (center.y()-self.range.top()) /scale[1], w, h)
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self.updateMatrix()
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def setRange(self, newRect=None, padding=0.05, lockAspect=None, propagate=True, disableAutoPixel=True):
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if disableAutoPixel:
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self.autoPixelRange=False
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if newRect is None:
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newRect = self.visibleRange()
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padding = 0
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padding = Point(padding)
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newRect = QtCore.QRectF(newRect)
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pw = newRect.width() * padding[0]
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ph = newRect.height() * padding[1]
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self.range = newRect.adjusted(-pw, -ph, pw, ph)
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#print "New Range:", self.range
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self.centralWidget.setGeometry(self.range)
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self.updateMatrix(propagate)
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def lockXRange(self, v1):
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if not v1 in self.lockedViewports:
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self.lockedViewports.append(v1)
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def setXRange(self, r, padding=0.05):
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r1 = QtCore.QRectF(self.range)
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r1.setLeft(r.left())
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r1.setRight(r.right())
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self.setRange(r1, padding=[padding, 0], propagate=False)
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def setYRange(self, r, padding=0.05):
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r1 = QtCore.QRectF(self.range)
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r1.setTop(r.top())
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r1.setBottom(r.bottom())
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self.setRange(r1, padding=[0, padding], propagate=False)
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def invertY(self, invert=True):
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#if self.yInverted != invert:
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#self.scale[1] *= -1.
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self.yInverted = invert
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self.updateMatrix()
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def wheelEvent(self, ev):
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if not self.mouseEnabled:
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return
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QtGui.QGraphicsView.wheelEvent(self, ev)
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sc = 1.001 ** ev.delta()
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#self.scale *= sc
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#self.updateMatrix()
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self.scale(sc, sc)
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def setAspectLocked(self, s):
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self.aspectLocked = s
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#def mouseDoubleClickEvent(self, ev):
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#QtGui.QGraphicsView.mouseDoubleClickEvent(self, ev)
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#pass
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### This function is here because interactive mode is disabled due to bugs.
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#def graphicsSceneEvent(self, ev, pev=None, fev=None):
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#ev1 = GraphicsSceneMouseEvent()
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#ev1.setPos(QtCore.QPointF(ev.pos().x(), ev.pos().y()))
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#ev1.setButtons(ev.buttons())
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#ev1.setButton(ev.button())
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#ev1.setModifiers(ev.modifiers())
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#ev1.setScenePos(self.mapToScene(QtCore.QPoint(ev.pos())))
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#if pev is not None:
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#ev1.setLastPos(pev.pos())
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#ev1.setLastScenePos(pev.scenePos())
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#ev1.setLastScreenPos(pev.screenPos())
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#if fev is not None:
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#ev1.setButtonDownPos(fev.pos())
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#ev1.setButtonDownScenePos(fev.scenePos())
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#ev1.setButtonDownScreenPos(fev.screenPos())
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#return ev1
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def mousePressEvent(self, ev):
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QtGui.QGraphicsView.mousePressEvent(self, ev)
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#print "Press over:"
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#for i in self.items(ev.pos()):
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# print i.zValue(), int(i.acceptedMouseButtons()), i, i.scenePos()
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#print "Event accepted:", ev.isAccepted()
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#print "Grabber:", self.scene().mouseGrabberItem()
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if not self.mouseEnabled:
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return
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self.lastMousePos = Point(ev.pos())
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self.mousePressPos = ev.pos()
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self.clickAccepted = ev.isAccepted()
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if not self.clickAccepted:
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self.scene().clearSelection()
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return ## Everything below disabled for now..
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#self.currentItem = None
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#maxZ = None
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#for i in self.items(ev.pos()):
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#if maxZ is None or maxZ < i.zValue():
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#self.currentItem = i
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#maxZ = i.zValue()
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#print "make event"
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#self.pev = self.graphicsSceneEvent(ev)
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#self.fev = self.pev
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#if self.currentItem is not None:
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#self.currentItem.mousePressEvent(self.pev)
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##self.clearMouse()
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##self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
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#self.emit(QtCore.SIGNAL("mousePressed(PyQt_PyObject)"), self.mouseTrail)
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def mouseReleaseEvent(self, ev):
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QtGui.QGraphicsView.mouseReleaseEvent(self, ev)
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if not self.mouseEnabled:
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return
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#self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
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self.emit(QtCore.SIGNAL("mouseReleased"), ev)
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self.lastButtonReleased = ev.button()
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return ## Everything below disabled for now..
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##self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
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#self.emit(QtCore.SIGNAL("mouseReleased(PyQt_PyObject)"), self.mouseTrail)
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#if self.currentItem is not None:
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#pev = self.graphicsSceneEvent(ev, self.pev, self.fev)
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#self.pev = pev
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#self.currentItem.mouseReleaseEvent(pev)
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#self.currentItem = None
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def mouseMoveEvent(self, ev):
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QtGui.QGraphicsView.mouseMoveEvent(self, ev)
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if not self.mouseEnabled:
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return
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self.emit(QtCore.SIGNAL("sceneMouseMoved(PyQt_PyObject)"), self.mapToScene(ev.pos()))
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#print "moved. Grabber:", self.scene().mouseGrabberItem()
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if self.lastMousePos is None:
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self.lastMousePos = Point(ev.pos())
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if self.clickAccepted: ## Ignore event if an item in the scene has already claimed it.
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return
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delta = Point(ev.pos()) - self.lastMousePos
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self.lastMousePos = Point(ev.pos())
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if ev.buttons() == QtCore.Qt.RightButton:
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delta = Point(clip(delta[0], -50, 50), clip(-delta[1], -50, 50))
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scale = 1.01 ** delta
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#if self.yInverted:
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#scale[0] = 1. / scale[0]
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self.scale(scale[0], scale[1], center=self.mapToScene(self.mousePressPos))
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self.emit(QtCore.SIGNAL('regionChanged(QRectF)'), self.range)
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elif ev.buttons() in [QtCore.Qt.MidButton, QtCore.Qt.LeftButton]: ## Allow panning by left or mid button.
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tr = -delta / self.currentScale
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self.translate(tr[0], tr[1])
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self.emit(QtCore.SIGNAL('regionChanged(QRectF)'), self.range)
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#return ## Everything below disabled for now..
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##self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
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#if self.currentItem is not None:
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#pev = self.graphicsSceneEvent(ev, self.pev, self.fev)
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#self.pev = pev
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#self.currentItem.mouseMoveEvent(pev)
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def writeSvg(self, fileName=None):
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if fileName is None:
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fileName = str(QtGui.QFileDialog.getSaveFileName())
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self.svg = QtSvg.QSvgGenerator()
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self.svg.setFileName(fileName)
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self.svg.setSize(self.size())
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self.svg.setResolution(600)
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painter = QtGui.QPainter(self.svg)
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self.render(painter)
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def writeImage(self, fileName=None):
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if fileName is None:
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fileName = str(QtGui.QFileDialog.getSaveFileName())
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self.png = QtGui.QImage(self.size(), QtGui.QImage.Format_ARGB32)
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painter = QtGui.QPainter(self.png)
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rh = self.renderHints()
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self.setRenderHints(QtGui.QPainter.Antialiasing)
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self.render(painter)
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self.setRenderHints(rh)
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self.png.save(fileName)
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def writePs(self, fileName=None):
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if fileName is None:
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fileName = str(QtGui.QFileDialog.getSaveFileName())
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printer = QtGui.QPrinter(QtGui.QPrinter.HighResolution)
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printer.setOutputFileName(fileName)
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painter = QtGui.QPainter(printer)
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self.render(painter)
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painter.end()
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#def getFreehandLine(self):
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## Wait for click
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#self.clearMouse()
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#while self.lastButtonReleased != QtCore.Qt.LeftButton:
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#QtGui.qApp.sendPostedEvents()
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#QtGui.qApp.processEvents()
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#time.sleep(0.01)
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#fl = vstack(self.mouseTrail)
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#return fl
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#def getClick(self):
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#fl = self.getFreehandLine()
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#return fl[-1]
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#class GraphicsSceneMouseEvent(QtGui.QGraphicsSceneMouseEvent):
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#"""Stand-in class for QGraphicsSceneMouseEvent"""
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#def __init__(self):
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#QtGui.QGraphicsSceneMouseEvent.__init__(self)
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#def setPos(self, p):
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#self.vpos = p
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#def setButtons(self, p):
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#self.vbuttons = p
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#def setButton(self, p):
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#self.vbutton = p
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#def setModifiers(self, p):
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#self.vmodifiers = p
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#def setScenePos(self, p):
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#self.vscenePos = p
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#def setLastPos(self, p):
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#self.vlastPos = p
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#def setLastScenePos(self, p):
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#self.vlastScenePos = p
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#def setLastScreenPos(self, p):
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#self.vlastScreenPos = p
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#def setButtonDownPos(self, p):
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#self.vbuttonDownPos = p
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#def setButtonDownScenePos(self, p):
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#self.vbuttonDownScenePos = p
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#def setButtonDownScreenPos(self, p):
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#self.vbuttonDownScreenPos = p
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#def pos(self):
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#return self.vpos
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#def buttons(self):
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#return self.vbuttons
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#def button(self):
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#return self.vbutton
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#def modifiers(self):
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#return self.vmodifiers
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#def scenePos(self):
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#return self.vscenePos
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#def lastPos(self):
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#return self.vlastPos
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#def lastScenePos(self):
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#return self.vlastScenePos
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#def lastScreenPos(self):
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#return self.vlastScreenPos
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#def buttonDownPos(self):
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#return self.vbuttonDownPos
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#def buttonDownScenePos(self):
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#return self.vbuttonDownScenePos
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#def buttonDownScreenPos(self):
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#return self.vbuttonDownScreenPos
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