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- asymmetric scaling by mousewheel over scales (ScaleItem)

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Ingo B. 2011-02-10 17:03:28 +01:00
parent a8260b641c
commit a1edf60ea9
1 changed files with 19 additions and 8 deletions
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27
graphicsItems.py
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@ -1338,11 +1338,15 @@ class ScaleItem(QtGui.QGraphicsWidget):
else: else:
self.setHeight(0) self.setHeight(0)
QtGui.QGraphicsWidget.hide(self) QtGui.QGraphicsWidget.hide(self)
def wheelEvent(self, ev):
if self.linkedView is None: return
if self.orientation in ['left', 'right']:
self.linkedView.wheelEvent(ev, axis=1)
else:
self.linkedView.wheelEvent(ev, axis=0)
ev.accept()
class ViewBox(QtGui.QGraphicsWidget): class ViewBox(QtGui.QGraphicsWidget):
@ -1497,11 +1501,18 @@ class ViewBox(QtGui.QGraphicsWidget):
#self.replot(autoRange=False) #self.replot(autoRange=False)
#self.updateMatrix() #self.updateMatrix()
def wheelEvent(self, ev): def wheelEvent(self, ev, axis=None):
mask = np.array(self.mouseEnabled, dtype=np.float) mask = np.array(self.mouseEnabled, dtype=np.float)
degree = ev.delta() / 8.0; degree = ev.delta() / 8.0;
dif = np.array([degree, degree]) dif = np.zeros(2) # FIXME: insert axis count here ..
s = ((mask * 0.02) + 1) ** dif if axis is not None and axis >= 0 and axis < len(dif):
# set axis for asymmetric scaling
dif.itemset(axis, 1.0)
else:
dif += 1.0 # scale symmetrical by default
dif *= degree
s = ((mask * 0.02) + 1) ** dif # actual scaling factor
# scale 'around' mouse cursor position
center = Point(self.childGroup.transform().inverted()[0].map(ev.pos())) center = Point(self.childGroup.transform().inverted()[0].map(ev.pos()))
self.scaleBy(s, center) self.scaleBy(s, center)
self.emit(QtCore.SIGNAL('rangeChangedManually'), self.mouseEnabled) self.emit(QtCore.SIGNAL('rangeChangedManually'), self.mouseEnabled)