259 lines
7.8 KiB
Python
259 lines
7.8 KiB
Python
# -*- coding: utf-8 -*-
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from .Qt import QtCore, QtGui
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from .Point import Point
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import numpy as np
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class SRTTransform(QtGui.QTransform):
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"""Transform that can always be represented as a combination of 3 matrices: scale * rotate * translate
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This transform has no shear; angles are always preserved.
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"""
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def __init__(self, init=None):
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QtGui.QTransform.__init__(self)
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self.reset()
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if init is None:
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return
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elif isinstance(init, dict):
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self.restoreState(init)
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elif isinstance(init, SRTTransform):
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self._state = {
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'pos': Point(init._state['pos']),
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'scale': Point(init._state['scale']),
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'angle': init._state['angle']
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}
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self.update()
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elif isinstance(init, QtGui.QTransform):
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self.setFromQTransform(init)
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elif isinstance(init, QtGui.QMatrix4x4):
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self.setFromMatrix4x4(init)
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else:
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raise Exception("Cannot create SRTTransform from input type: %s" % str(type(init)))
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def getScale(self):
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return self._state['scale']
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def getAngle(self):
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## deprecated; for backward compatibility
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return self.getRotation()
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def getRotation(self):
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return self._state['angle']
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def getTranslation(self):
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return self._state['pos']
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def reset(self):
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self._state = {
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'pos': Point(0,0),
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'scale': Point(1,1),
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'angle': 0.0 ## in degrees
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}
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self.update()
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def setFromQTransform(self, tr):
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p1 = Point(tr.map(0., 0.))
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p2 = Point(tr.map(1., 0.))
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p3 = Point(tr.map(0., 1.))
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dp2 = Point(p2-p1)
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dp3 = Point(p3-p1)
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## detect flipped axes
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if dp2.angle(dp3) > 0:
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#da = 180
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da = 0
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sy = -1.0
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else:
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da = 0
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sy = 1.0
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self._state = {
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'pos': Point(p1),
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'scale': Point(dp2.length(), dp3.length() * sy),
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'angle': (np.arctan2(dp2[1], dp2[0]) * 180. / np.pi) + da
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}
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self.update()
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def setFromMatrix4x4(self, m):
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m = SRTTransform3D(m)
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angle, axis = m.getRotation()
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if angle != 0 and (axis[0] != 0 or axis[1] != 0 or axis[2] != 1):
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print("angle: %s axis: %s" % (str(angle), str(axis)))
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raise Exception("Can only convert 4x4 matrix to 3x3 if rotation is around Z-axis.")
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self._state = {
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'pos': Point(m.getTranslation()),
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'scale': Point(m.getScale()),
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'angle': angle
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}
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self.update()
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def translate(self, *args):
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"""Acceptable arguments are:
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x, y
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[x, y]
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Point(x,y)"""
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t = Point(*args)
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self.setTranslate(self._state['pos']+t)
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def setTranslate(self, *args):
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"""Acceptable arguments are:
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x, y
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[x, y]
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Point(x,y)"""
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self._state['pos'] = Point(*args)
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self.update()
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def scale(self, *args):
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"""Acceptable arguments are:
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x, y
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[x, y]
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Point(x,y)"""
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s = Point(*args)
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self.setScale(self._state['scale'] * s)
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def setScale(self, *args):
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"""Acceptable arguments are:
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x, y
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[x, y]
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Point(x,y)"""
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self._state['scale'] = Point(*args)
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self.update()
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def rotate(self, angle):
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"""Rotate the transformation by angle (in degrees)"""
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self.setRotate(self._state['angle'] + angle)
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def setRotate(self, angle):
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"""Set the transformation rotation to angle (in degrees)"""
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self._state['angle'] = angle
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self.update()
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def __truediv__(self, t):
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"""A / B == B^-1 * A"""
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dt = t.inverted()[0] * self
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return SRTTransform(dt)
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def __div__(self, t):
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return self.__truediv__(t)
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def __mul__(self, t):
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return SRTTransform(QtGui.QTransform.__mul__(self, t))
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def saveState(self):
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p = self._state['pos']
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s = self._state['scale']
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#if s[0] == 0:
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#raise Exception('Invalid scale: %s' % str(s))
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return {'pos': (p[0], p[1]), 'scale': (s[0], s[1]), 'angle': self._state['angle']}
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def restoreState(self, state):
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self._state['pos'] = Point(state.get('pos', (0,0)))
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self._state['scale'] = Point(state.get('scale', (1.,1.)))
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self._state['angle'] = state.get('angle', 0)
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self.update()
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def update(self):
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QtGui.QTransform.reset(self)
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## modifications to the transform are multiplied on the right, so we need to reverse order here.
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QtGui.QTransform.translate(self, *self._state['pos'])
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QtGui.QTransform.rotate(self, self._state['angle'])
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QtGui.QTransform.scale(self, *self._state['scale'])
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def __repr__(self):
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return str(self.saveState())
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def matrix(self):
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return np.array([[self.m11(), self.m12(), self.m13()],[self.m21(), self.m22(), self.m23()],[self.m31(), self.m32(), self.m33()]])
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if __name__ == '__main__':
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from . import widgets
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import GraphicsView
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from .functions import *
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app = QtGui.QApplication([])
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win = QtGui.QMainWindow()
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win.show()
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cw = GraphicsView.GraphicsView()
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#cw.enableMouse()
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win.setCentralWidget(cw)
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s = QtGui.QGraphicsScene()
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cw.setScene(s)
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win.resize(600,600)
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cw.enableMouse()
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cw.setRange(QtCore.QRectF(-100., -100., 200., 200.))
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class Item(QtGui.QGraphicsItem):
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def __init__(self):
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QtGui.QGraphicsItem.__init__(self)
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self.b = QtGui.QGraphicsRectItem(20, 20, 20, 20, self)
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self.b.setPen(QtGui.QPen(mkPen('y')))
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self.t1 = QtGui.QGraphicsTextItem(self)
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self.t1.setHtml('<span style="color: #F00">R</span>')
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self.t1.translate(20, 20)
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self.l1 = QtGui.QGraphicsLineItem(10, 0, -10, 0, self)
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self.l2 = QtGui.QGraphicsLineItem(0, 10, 0, -10, self)
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self.l1.setPen(QtGui.QPen(mkPen('y')))
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self.l2.setPen(QtGui.QPen(mkPen('y')))
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def boundingRect(self):
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return QtCore.QRectF()
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def paint(self, *args):
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pass
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#s.addItem(b)
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#s.addItem(t1)
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item = Item()
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s.addItem(item)
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l1 = QtGui.QGraphicsLineItem(10, 0, -10, 0)
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l2 = QtGui.QGraphicsLineItem(0, 10, 0, -10)
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l1.setPen(QtGui.QPen(mkPen('r')))
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l2.setPen(QtGui.QPen(mkPen('r')))
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s.addItem(l1)
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s.addItem(l2)
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tr1 = SRTTransform()
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tr2 = SRTTransform()
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tr3 = QtGui.QTransform()
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tr3.translate(20, 0)
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tr3.rotate(45)
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print("QTransform -> Transform:", SRTTransform(tr3))
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print("tr1:", tr1)
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tr2.translate(20, 0)
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tr2.rotate(45)
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print("tr2:", tr2)
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dt = tr2/tr1
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print("tr2 / tr1 = ", dt)
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print("tr2 * tr1 = ", tr2*tr1)
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tr4 = SRTTransform()
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tr4.scale(-1, 1)
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tr4.rotate(30)
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print("tr1 * tr4 = ", tr1*tr4)
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w1 = widgets.TestROI((19,19), (22, 22), invertible=True)
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#w2 = widgets.TestROI((0,0), (150, 150))
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w1.setZValue(10)
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s.addItem(w1)
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#s.addItem(w2)
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w1Base = w1.getState()
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#w2Base = w2.getState()
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def update():
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tr1 = w1.getGlobalTransform(w1Base)
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#tr2 = w2.getGlobalTransform(w2Base)
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item.setTransform(tr1)
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#def update2():
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#tr1 = w1.getGlobalTransform(w1Base)
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#tr2 = w2.getGlobalTransform(w2Base)
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#t1.setTransform(tr1)
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#w1.setState(w1Base)
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#w1.applyGlobalTransform(tr2)
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w1.sigRegionChanged.connect(update)
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#w2.sigRegionChanged.connect(update2)
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from .SRTTransform3D import SRTTransform3D
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