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Thread: Unexpected Offset in paintEvent

  1. #1
    Join Date
    Feb 2021
    Posts
    2
    Thanks
    1
    Qt products
    Qt5
    Platforms
    Windows

    Default Unexpected Offset in paintEvent

    Does anybody know, why the Rect drawn in the paintEvent does not cover the exact area of my QWidget but instead starts at an weird offset?

    Qt Code:
    1. class ContainerWidget(QWidget):
    2. def __init__(self):
    3. super().__init__()
    4. pal = QPalette()
    5. pal.setColor(QPalette.Window, Qt.magenta)
    6. self.setAutoFillBackground(True)
    7. self.setPalette(pal)
    8. def paintEvent(self, event):
    9. opt = QStyleOption()
    10. opt.initFrom(self)
    11. painter = QPainter(self)
    12. painter.setBrush( Qt.red )
    13. painter.drawRect(self.geometry().x(), self.geometry().y(), self.geometry().width(), self.geometry().height())
    14.  
    15.  
    16. class TopWidget(QWidget):
    17. def __init__(self):
    18. super().__init__()
    19. pal = QPalette()
    20. pal.setColor(QPalette.Window, Qt.yellow)
    21. self.setAutoFillBackground(True)
    22. self.setPalette(pal)
    23. def paintEvent(self, event):
    24. painter = QPainter(self)
    25. painter.setBrush( Qt.green )
    26. painter.drawRect(self.x(), self.y(), self.width(), self.height())
    27.  
    28. class BottomWidget(QWidget):
    29. def __init__(self):
    30. super().__init__()
    31. pal = QPalette()
    32. pal.setColor(QPalette.Window, Qt.gray)
    33. self.setAutoFillBackground(True)
    34. self.setPalette(pal)
    35. def paintEvent(self, event):
    36. painter = QPainter(self)
    37. painter.setBrush( Qt.blue )
    38. painter.drawRect(self.x(), self.y(), self.width(), self.height())
    39.  
    40. def main():
    41. app = QApplication()
    42. containerWidget = ContainerWidget()
    43. containerLayout = QVBoxLayout(containerWidget)
    44. containerWidget.resize(800,600)
    45. containerLayout.setSpacing(0)
    46. containerLayout.setContentsMargins(0,0,0,0)
    47.  
    48.  
    49. containerWidget.show()
    50. sys.exit(app.exec_())
    51.  
    52. if __name__ == "__main__":
    53. main()
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    paintevent_off.jpg

  2. #2
    Join Date
    Jan 2008
    Location
    Alameda, CA, USA
    Posts
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    Qt products
    Qt5
    Platforms
    Windows Android

    Default Re: Unexpected Offset in paintEvent

    You are using the QWidget::geometry() to paint the rect instead of the widget's position and size (QWidget::rect())
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  3. The following user says thank you to d_stranz for this useful post:

    shambalain61 (10th April 2021)

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