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clean up textitem, fix anchoring

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This commit is contained in:
Luke Campagnola 2016-02-19 09:33:47 -08:00
parent 5172b782b5
commit a8510c3354
1 changed files with 47 additions and 21 deletions
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68
pyqtgraph/graphicsItems/TextItem.py
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@ -32,7 +32,7 @@ class TextItem(UIGraphicsItem):
UIGraphicsItem.__init__(self)
self.textItem = QtGui.QGraphicsTextItem()
self.textItem.setParentItem(self)
self.lastTransform = None
self._lastTransform = None
self._bounds = QtCore.QRectF()
if html is None:
self.setText(text, color)
@ -40,7 +40,7 @@ class TextItem(UIGraphicsItem):
self.setHtml(html)
self.fill = fn.mkBrush(fill)
self.border = fn.mkPen(border)
self.rotate(angle)
self.setAngle(angle)
#self.textItem.setFlag(self.ItemIgnoresTransformations) ## This is required to keep the text unscaled inside the viewport
def setText(self, text, color=(200,200,200)):
@ -100,23 +100,25 @@ class TextItem(UIGraphicsItem):
self.textItem.setFont(*args)
self.updateText()
#def setAngle(self, angle):
#self.angle = angle
#self.updateText()
def setAngle(self, angle):
self.textItem.resetTransform()
self.textItem.rotate(angle)
self.updateText()
def updateText(self):
# update text position to obey anchor
r = self.textItem.boundingRect()
tl = self.textItem.mapToParent(r.topLeft())
br = self.textItem.mapToParent(r.bottomRight())
offset = (br - tl) * self.anchor
self.textItem.setPos(-offset)
## Needed to maintain font size when rendering to image with increased resolution
self.textItem.resetTransform()
#self.textItem.rotate(self.angle)
if self._exportOpts is not False and 'resolutionScale' in self._exportOpts:
s = self._exportOpts['resolutionScale']
self.textItem.scale(s, s)
self.textItem.setTransform(self.sceneTransform().inverted()[0])
self.textItem.setPos(0,0)
self.textItem.setPos(-self.textItem.mapToParent(Point(0,0)))
### Needed to maintain font size when rendering to image with increased resolution
#self.textItem.resetTransform()
##self.textItem.rotate(self.angle)
#if self._exportOpts is not False and 'resolutionScale' in self._exportOpts:
#s = self._exportOpts['resolutionScale']
#self.textItem.scale(s, s)
def viewRangeChanged(self):
self.updateText()
@ -124,12 +126,15 @@ class TextItem(UIGraphicsItem):
def boundingRect(self):
return self.textItem.mapToParent(self.textItem.boundingRect()).boundingRect()
def viewTransformChanged(self):
# called whenever view transform has changed.
# Do this here to avoid double-updates when view changes.
self.updateTransform()
def paint(self, p, *args):
tr = p.transform()
if self.lastTransform is not None:
if tr != self.lastTransform:
self.viewRangeChanged()
self.lastTransform = tr
# this is not ideal because it causes another update to be scheduled.
# ideally, we would have a sceneTransformChanged event to react to..
self.updateTransform()
if self.border.style() != QtCore.Qt.NoPen or self.fill.style() != QtCore.Qt.NoBrush:
p.setPen(self.border)
@ -137,4 +142,25 @@ class TextItem(UIGraphicsItem):
p.setRenderHint(p.Antialiasing, True)
p.drawPolygon(self.textItem.mapToParent(self.textItem.boundingRect()))
def updateTransform(self):
# update transform such that this item has the correct orientation
# and scaling relative to the scene, but inherits its position from its
# parent.
# This is similar to setting ItemIgnoresTransformations = True, but
# does not break mouse interaction and collision detection.
p = self.parentItem()
if p is None:
pt = QtGui.QTransform()
else:
pt = p.sceneTransform()
if pt == self._lastTransform:
return
t = pt.inverted()[0]
# reset translation
t.setMatrix(t.m11(), t.m12(), t.m13(), t.m21(), t.m22(), t.m23(), 0, 0, t.m33())
self.setTransform(t)
self._lastTransform = pt