[英]Painting on a widget that contains a QGridLayout in PySide/PyQt
我正在制作一个自定义QWidget,其中有一个QGridLayout,并在网格中的特定元素上绘制了一个矩形。 我还手动绘制线来描绘网格元素的位置(使用QPainter.DrawLines)。
绘制线条之后,我将在一个网格元素中绘制矩形,并使用QGridLayout坐标系指定其位置。
问题是,矩形不局限于其网格元素。 例如,在下面的示例中,蓝色矩形和黑色网格线不对齐,因此我最终得到一个在空间中漂浮的蓝色框。
我尚未通过Google或SO找到对此问题的明确讨论。
编辑:
请注意,正如接受的答案中指出的那样,错误是我本应使用点坐标(即列,行)时使用网格坐标在网格上绘制的。 也就是说,以下代码中的错误是网格中的元素的x和y坐标颠倒了。
from PySide import QtGui, QtCore
class HighlightSquare(QtGui.QWidget):
def __init__(self, parent = None):
QtGui.QWidget.__init__(self, parent=None)
self.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding))
self.setMinimumSize(self.minimumSizeHint())
layout = QtGui.QGridLayout()
layout.addItem(QtGui.QSpacerItem(10,10), 0, 0)
layout.addItem(QtGui.QSpacerItem(10,10), 0, 1)
layout.addItem(QtGui.QSpacerItem(10,10), 1, 0)
layout.addItem(QtGui.QSpacerItem(10,10), 1, 1)
self.setLayout(layout)
self.resize(150, 150)
self.update()
def paintEvent(self, event = None):
painter = QtGui.QPainter(self)
painter.setRenderHint(QtGui.QPainter.Antialiasing)
winHeight=self.size().height(); heightStep=winHeight/2
winWidth=self.size().width(); widthStep=winWidth/2
#Draw lines
painter.setPen(QtCore.Qt.black)
for i in range(4):
#vertical lines
painter.drawLine(QtCore.QPoint(i*widthStep,0), QtCore.QPoint(i*widthStep, winHeight))
#horizontal lines
painter.drawLine(QtCore.QPoint(0,heightStep*i), QtCore.QPoint(winWidth, heightStep*i))
#Draw blue outline around box 1,1
highlightCoordinate=(1,1)
pen=QtGui.QPen(QtCore.Qt.blue, 3)
painter.setPen(pen)
coordHighlight=[QtCore.QPoint(highlightCoordinate[1]*heightStep, highlightCoordinate[0]*widthStep),\
QtCore.QPoint(highlightCoordinate[1]*heightStep, (highlightCoordinate[0]+1)*widthStep),\
QtCore.QPoint((highlightCoordinate[1]+1)*heightStep, (highlightCoordinate[0]+1)*widthStep),\
QtCore.QPoint((highlightCoordinate[1]+1)*heightStep, highlightCoordinate[0]*widthStep),\
QtCore.QPoint(highlightCoordinate[1]*heightStep, highlightCoordinate[0]*widthStep)]
#print coordHighlight
painter.drawPolyline(coordHighlight)
def minimumSizeHint(self):
return QtCore.QSize(120,120)
if __name__=="__main__":
import sys
app=QtGui.QApplication(sys.argv)
myLight = HighlightSquare()
myLight.show()
sys.exit(app.exec_())
您是否已阅读QtCore.QPoint
类的构造函数的定义? 在方法QPoint.__init__ (self, int xpos, int ypos)
您的代码被反转(ypos, xpos)
。 我修好了它。
import sys
from PyQt4 import QtGui, QtCore
class QHighlightSquareWidget (QtGui.QWidget):
def __init__ (self, parent = None):
QtGui.QWidget.__init__(self, parent = None)
self.setSizePolicy (
QtGui.QSizePolicy (
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding))
self.setMinimumSize(self.minimumSizeHint())
allQGridLayout = QtGui.QGridLayout()
allQGridLayout.addItem(QtGui.QSpacerItem(10,10), 0, 0)
allQGridLayout.addItem(QtGui.QSpacerItem(10,10), 0, 1)
allQGridLayout.addItem(QtGui.QSpacerItem(10,10), 1, 0)
allQGridLayout.addItem(QtGui.QSpacerItem(10,10), 1, 1)
self.setLayout(allQGridLayout)
self.resize(150, 150)
self.update()
def paintEvent (self, eventQPaintEvent):
myQPainter = QtGui.QPainter(self)
myQPainter.setRenderHint(QtGui.QPainter.Antialiasing)
winHeight = self.size().height()
heightStep = winHeight / 2
winWidth = self.size().width()
widthStep = winWidth / 2
myQPainter.setPen(QtCore.Qt.black)
for i in range(4):
myQPainter.drawLine(QtCore.QPoint(i * widthStep, 0 ), QtCore.QPoint(i * widthStep, winHeight ))
myQPainter.drawLine(QtCore.QPoint(0, heightStep * i), QtCore.QPoint(winWidth, heightStep * i))
highlightCoordinate = (1, 1)
myQPen = QtGui.QPen(QtCore.Qt.blue, 3)
myQPainter.setPen(myQPen)
coordHighlight = [
QtCore.QPoint( highlightCoordinate[0] * widthStep, highlightCoordinate[1] * heightStep),
QtCore.QPoint((highlightCoordinate[0] + 1) * widthStep, highlightCoordinate[1] * heightStep),
QtCore.QPoint((highlightCoordinate[0] + 1) * widthStep, (highlightCoordinate[1] + 1) * heightStep),
QtCore.QPoint( highlightCoordinate[0] * widthStep, (highlightCoordinate[1] + 1) * heightStep),
QtCore.QPoint( highlightCoordinate[0] * widthStep, highlightCoordinate[1] * heightStep)]
myQPainter.drawPolyline(*coordHighlight)
def minimumSizeHint (self):
return QtCore.QSize(120, 120)
if __name__=="__main__":
myQApplication = QtGui.QApplication(sys.argv)
myQHighlightSquareWidget = QHighlightSquareWidget()
myQHighlightSquareWidget.show()
sys.exit(myQApplication.exec_())
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