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label correctly follows oblique lines

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This commit is contained in:
Luke Campagnola 2016-02-21 23:18:01 -08:00
parent 069a5bfeea
commit f3a584b8b7
1 changed files with 18 additions and 7 deletions
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25
pyqtgraph/graphicsItems/InfiniteLine.py
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@ -328,14 +328,25 @@ class InfLineLabel(TextItem):
# not in a viewbox, skip update
return
# 1. determine view extents along line axis
tr = view.childGroup.itemTransform(self.line)[0]
vr = tr.mapRect(view.viewRect())
pt1 = Point(vr.left(), 0)
pt2 = Point(vr.right(), 0)
# 2. pick relative point between extents and set position
lr = self.line.boundingRect()
pt1 = Point(lr.left(), 0)
pt2 = Point(lr.right(), 0)
if self.line.angle % 90 != 0:
# more expensive to find text position for oblique lines.
p = QtGui.QPainterPath()
p.moveTo(pt1)
p.lineTo(pt2)
p = self.line.itemTransform(view)[0].map(p)
vr = QtGui.QPainterPath()
vr.addRect(view.boundingRect())
paths = vr.intersected(p).toSubpathPolygons()
if len(paths) > 0:
l = list(paths[0])
pt1 = self.line.mapFromItem(view, l[0])
pt2 = self.line.mapFromItem(view, l[1])
pt = pt2 * self.orthoPos + pt1 * (1-self.orthoPos)
self.setPos(pt)
def setVisible(self, v):