QGraphicsEllipseItem gives wrong shape #1095
Description
I'm trying to combine multiple QGraphicsEllipseItem to one QPainterPath. To archive this I use the shape() function and simplify the QPainterPath.
When I set the span angle to 360 degrees I get the right output. But when I use a lower degree (e. g. 359 or 180) I get strange shape.
Red is what I want and blue is what I get.
Short description
QGraphicsEllipseItem gives strange shape when the span angle is below 360 degrees.
Expected behavior
The red shape
Real behavior
The blue shape
Code to reproduce
import pyqtgraph as pg
from pyqtgraph.Qt import QtGui
app = QtGui.QApplication([])
pg.setConfigOption('background', 'w')
pg.setConfigOption('foreground', 'k')
win = pg.GraphicsWindow()
canvas1 = win.addPlot()
canvas2 = win.addPlot()
canvas1.setAspectLocked(True)
canvas2.setAspectLocked(True)
ellipse1 = QtGui.QGraphicsEllipseItem(0, 0, 20, 20)
ellipse1.setStartAngle(0 * 16)
ellipse1.setSpanAngle(180 * 16)
ellipse1.setPen(pg.mkPen(0, 0, 0, 255))
ellipse1.setBrush(pg.mkBrush(255, 0, 0, 255))
canvas1.addItem(ellipse1)
ellipse2 = QtGui.QGraphicsEllipseItem(0, 20, 20, 20)
ellipse2.setStartAngle(0 * 16)
ellipse2.setSpanAngle(360 * 16)
ellipse2.setPen(pg.mkPen(0, 0, 0, 255))
ellipse2.setBrush(pg.mkBrush(255, 0, 0, 255))
canvas1.addItem(ellipse2)
painter_path1 = ellipse1.shape().simplified()
painter_path2 = ellipse2.shape().simplified()
painter_path = QtGui.QPainterPath()
for p in [painter_path1, painter_path2]:
painter_path += p
#painter_path.closeSubpath()
area = QtGui.QGraphicsPathItem(painter_path)
area.setPen(pg.mkPen(0, 0, 0, 255))
area.setBrush(pg.mkBrush(0, 0, 255, 255))
canvas2.addItem(area)
win.showMaximized()
if __name__ == '__main__':
QtGui.QApplication.instance().exec_()Tested environment(s)
- PyQtGraph version: 0.10.0 (also tried with development version 0.11.0)
- Qt Python binding: PyQt5 5.13.2 Qt 5.13.2
- Python version: 3.5.2 and 3.7.5
- Operating system: Ubuntu 16.04
- Installation method: pip