def __init__(self, scene):
super(ScalingView, self).__init__(scene)
#from PyQt4 import QtOpenGL
#self.opengl = QtOpenGL.QGLWidget(QtOpenGL.QGLFormat(QtOpenGL.QGL.SampleBuffers))
#self.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
#self.setViewport(self.opengl)
#this would work if scene used a bitmap for background brush
#self.setCacheMode(self.CacheBackground)
self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.scaler = ScaleAnimation(self)
self.scaler.finished.connect(self.scale_finished)
self.scroller = ViewScrollAnimation(self)
self.scroller.finished.connect(self.scroll_finished)
self.viewport_changed.connect(scene.widget._onViewportChanged)
self.scale_changed.connect(scene.widget._onViewScaleChanged)
self.scale_started.connect(scene._onViewScaleStarted)
self.scale_finished.connect(scene._onViewScaleFinished)
self.scroll_started.connect(scene._onViewScrollStarted)
self.scroll_finished.connect(scene._onViewScrollFinished)
self.horizontalScrollBar().valueChanged.connect(self._onValueChanged)
self.verticalScrollBar().valueChanged.connect(self._onValueChanged)
class ScalingView(QtGui.QGraphicsView):
scale_changed = QtCore.pyqtSignal(float)
scale_started = QtCore.pyqtSignal()
scale_finished = QtCore.pyqtSignal()
scroll_started = QtCore.pyqtSignal()
scroll_finished = QtCore.pyqtSignal()
viewport_changed = QtCore.pyqtSignal(QtCore.QRectF, float)
def __init__(self, scene):
super(ScalingView, self).__init__(scene)
#from PyQt4 import QtOpenGL
#self.opengl = QtOpenGL.QGLWidget(QtOpenGL.QGLFormat(QtOpenGL.QGL.SampleBuffers))
#self.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
#self.setViewport(self.opengl)
#this would work if scene used a bitmap for background brush
#self.setCacheMode(self.CacheBackground)
self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.scaler = ScaleAnimation(self)
self.scaler.finished.connect(self.scale_finished)
self.scroller = ViewScrollAnimation(self)
self.scroller.finished.connect(self.scroll_finished)
self.viewport_changed.connect(scene.widget._onViewportChanged)
self.scale_changed.connect(scene.widget._onViewScaleChanged)
self.scale_started.connect(scene._onViewScaleStarted)
self.scale_finished.connect(scene._onViewScaleFinished)
self.scroll_started.connect(scene._onViewScrollStarted)
self.scroll_finished.connect(scene._onViewScrollFinished)
self.horizontalScrollBar().valueChanged.connect(self._onValueChanged)
self.verticalScrollBar().valueChanged.connect(self._onValueChanged)
def _onValueChanged(self, value):
rect = self.viewport().geometry()
new = self.mapToScene(rect).boundingRect()
self.viewport_changed.emit(new, self.getScale())
def getScale(self):
t = self.transform()
sx, sy = t.m11(), t.m22()
if sx != sy:
raise ValueError('Aspect Ratio Corrupt')
return sx
def setScale(self, factor):
t = QtGui.QTransform.fromScale(1, 1)
t.scale(factor, factor)
self.setTransform(t)
self.scale_changed.emit(factor)
scale = QtCore.pyqtProperty('float', getScale, setScale)
def getHpos(self): return self.horizontalScrollBar().value()
def setHpos(self, value): return self.horizontalScrollBar().setValue(value)
hpos = QtCore.pyqtProperty('int', getHpos, setHpos)
def getVpos(self): return self.verticalScrollBar().value()
def setVpos(self, value): return self.verticalScrollBar().setValue(value)
vpos = QtCore.pyqtProperty('int', getVpos, setVpos)
def zoom(self, scale):
self.scale_started.emit()
self.scaler.scaleTo(scale)
def scroll(self, direction):
self.scroller.scroll(direction)
