Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Tree: 6fc8a5ccaa
Fetching contributors…

Cannot retrieve contributors at this time

223 lines (188 sloc) 6.669 kB
# -*- coding: utf-8 -*-
from Qt import QtCore, QtGui
from Point import Point
import numpy as np
class Transform(QtGui.QTransform):
"""Transform that can always be represented as a combination of 3 matrices: scale * rotate * translate
This transform always has 0 shear.
"""
def __init__(self, init=None):
QtGui.QTransform.__init__(self)
self.reset()
if isinstance(init, dict):
self.restoreState(init)
elif isinstance(init, Transform):
self._state = {
'pos': Point(init._state['pos']),
'scale': Point(init._state['scale']),
'angle': init._state['angle']
}
self.update()
elif isinstance(init, QtGui.QTransform):
self.setFromQTransform(init)
def reset(self):
self._state = {
'pos': Point(0,0),
'scale': Point(1,1),
'angle': 0.0 ## in degrees
}
self.update()
def setFromQTransform(self, tr):
p1 = Point(tr.map(0., 0.))
p2 = Point(tr.map(1., 0.))
p3 = Point(tr.map(0., 1.))
dp2 = Point(p2-p1)
dp3 = Point(p3-p1)
## detect flipped axes
if dp2.angle(dp3) > 0:
#da = 180
da = 0
sy = -1.0
else:
da = 0
sy = 1.0
self._state = {
'pos': Point(p1),
'scale': Point(dp2.length(), dp3.length() * sy),
'angle': (np.arctan2(dp2[1], dp2[0]) * 180. / np.pi) + da
}
self.update()
def translate(self, *args):
"""Acceptable arguments are:
x, y
[x, y]
Point(x,y)"""
t = Point(*args)
self.setTranslate(self._state['pos']+t)
def setTranslate(self, *args):
"""Acceptable arguments are:
x, y
[x, y]
Point(x,y)"""
self._state['pos'] = Point(*args)
self.update()
def scale(self, *args):
"""Acceptable arguments are:
x, y
[x, y]
Point(x,y)"""
s = Point(*args)
self.setScale(self._state['scale'] * s)
def setScale(self, *args):
"""Acceptable arguments are:
x, y
[x, y]
Point(x,y)"""
self._state['scale'] = Point(*args)
self.update()
def rotate(self, angle):
"""Rotate the transformation by angle (in degrees)"""
self.setRotate(self._state['angle'] + angle)
def setRotate(self, angle):
"""Set the transformation rotation to angle (in degrees)"""
self._state['angle'] = angle
self.update()
def __div__(self, t):
"""A / B == B^-1 * A"""
dt = t.inverted()[0] * self
return Transform(dt)
def __mul__(self, t):
return Transform(QtGui.QTransform.__mul__(self, t))
def saveState(self):
p = self._state['pos']
s = self._state['scale']
if s[0] == 0:
raise Exception('Invalid scale')
return {'pos': (p[0], p[1]), 'scale': (s[0], s[1]), 'angle': self._state['angle']}
def restoreState(self, state):
self._state['pos'] = Point(state.get('pos', (0,0)))
self._state['scale'] = Point(state.get('scale', (1.,1.)))
self._state['angle'] = state.get('angle', 0)
self.update()
def update(self):
QtGui.QTransform.reset(self)
## modifications to the transform are multiplied on the right, so we need to reverse order here.
QtGui.QTransform.translate(self, *self._state['pos'])
QtGui.QTransform.rotate(self, self._state['angle'])
QtGui.QTransform.scale(self, *self._state['scale'])
def __repr__(self):
return str(self.saveState())
def matrix(self):
return np.array([[self.m11(), self.m12(), self.m13()],[self.m21(), self.m22(), self.m23()],[self.m31(), self.m32(), self.m33()]])
if __name__ == '__main__':
import widgets
import GraphicsView
from functions import *
app = QtGui.QApplication([])
win = QtGui.QMainWindow()
win.show()
cw = GraphicsView.GraphicsView()
#cw.enableMouse()
win.setCentralWidget(cw)
s = QtGui.QGraphicsScene()
cw.setScene(s)
win.resize(600,600)
cw.enableMouse()
cw.setRange(QtCore.QRectF(-100., -100., 200., 200.))
class Item(QtGui.QGraphicsItem):
def __init__(self):
QtGui.QGraphicsItem.__init__(self)
self.b = QtGui.QGraphicsRectItem(20, 20, 20, 20, self)
self.b.setPen(QtGui.QPen(mkPen('y')))
self.t1 = QtGui.QGraphicsTextItem(self)
self.t1.setHtml('<span style="color: #F00">R</span>')
self.t1.translate(20, 20)
self.l1 = QtGui.QGraphicsLineItem(10, 0, -10, 0, self)
self.l2 = QtGui.QGraphicsLineItem(0, 10, 0, -10, self)
self.l1.setPen(QtGui.QPen(mkPen('y')))
self.l2.setPen(QtGui.QPen(mkPen('y')))
def boundingRect(self):
return QtCore.QRectF()
def paint(self, *args):
pass
#s.addItem(b)
#s.addItem(t1)
item = Item()
s.addItem(item)
l1 = QtGui.QGraphicsLineItem(10, 0, -10, 0)
l2 = QtGui.QGraphicsLineItem(0, 10, 0, -10)
l1.setPen(QtGui.QPen(mkPen('r')))
l2.setPen(QtGui.QPen(mkPen('r')))
s.addItem(l1)
s.addItem(l2)
tr1 = Transform()
tr2 = Transform()
tr3 = QtGui.QTransform()
tr3.translate(20, 0)
tr3.rotate(45)
print "QTransform -> Transform:", Transform(tr3)
print "tr1:", tr1
tr2.translate(20, 0)
tr2.rotate(45)
print "tr2:", tr2
dt = tr2/tr1
print "tr2 / tr1 = ", dt
print "tr2 * tr1 = ", tr2*tr1
tr4 = Transform()
tr4.scale(-1, 1)
tr4.rotate(30)
print "tr1 * tr4 = ", tr1*tr4
w1 = widgets.TestROI((19,19), (22, 22), invertible=True)
#w2 = widgets.TestROI((0,0), (150, 150))
w1.setZValue(10)
s.addItem(w1)
#s.addItem(w2)
w1Base = w1.getState()
#w2Base = w2.getState()
def update():
tr1 = w1.getGlobalTransform(w1Base)
#tr2 = w2.getGlobalTransform(w2Base)
item.setTransform(tr1)
#def update2():
#tr1 = w1.getGlobalTransform(w1Base)
#tr2 = w2.getGlobalTransform(w2Base)
#t1.setTransform(tr1)
#w1.setState(w1Base)
#w1.applyGlobalTransform(tr2)
w1.sigRegionChanged.connect(update)
#w2.sigRegionChanged.connect(update2)
Jump to Line
Something went wrong with that request. Please try again.