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我想在QLabel上繪製一個自定義的Pixmap。我必須在一個圓圈中顯示圖像,並且該小部件在鼠標懸停上有動畫(例如,輪廓顏色突出顯示和屬性動畫)。我試圖在小部件的paintEvent內繪製整個圖像。但是性能下降速度是非常難以接受的。所以我製作了圖像緩存並在繪製事件中設置了像素圖,但圖像變得像素化。我究竟做錯了什麼? paintEvent中的相同功能可以繪製出高質量的圖像。如何使用QPainter高效地繪製圖像?
這是我的緩存像素圖
def fancyDraw(self, outlinePen):
hasValidImage = self._validateImage(self.image)
option = qg.QStyleOption()
option.initFrom(self)
x = option.rect.x()
y = option.rect.y()
width = option.rect.width() * self.radius
if not hasValidImage and self.shortName:
srcImage = qg.QPixmap(200, 200)
srcImage.fill(qc.Qt.transparent)
painter = qg.QPainter(srcImage)
# painter.begin()
painter.setRenderHint(qg.QPainter.Antialiasing)
painter.setBrush(self._brushText)
painter.setPen(self._penClear)
text_path = qg.QPainterPath()
text_width = self.font_metrics.width(self.shortName)
text_height = self.font().pointSize()
text_path.addText((200 - text_width)/2,
(200 - ((200 - text_height))/2) - 1,
self.font(), self.shortName)
painter.drawPath(text_path)
painter.end()
else:
srcImage = qg.QPixmap(qc.QString(self.image))
if srcImage.isNull():
logger.error("Failed to load image %s" % self.image)
resizedImage = srcImage.scaled(self.width(), self.height(),
qc.Qt.KeepAspectRatio,
qc.Qt.SmoothTransformation)
pixmap = qg.QPixmap(width, width)
pixmap.fill(qg.QColor("transparent"))
imgPainter = qg.QPainter(pixmap)
imgPainter.setRenderHint(qg.QPainter.Antialiasing)
clip = qg.QPainterPath()
clip.addEllipse(x + 1, y + 1, width - 2, width - 2)
imgPainter.setClipPath(clip)
imgPainter.drawPixmap(0, 0, width, width, resizedImage)
imgPainter.end()
painter = qg.QPainter(pixmap)
painter.setRenderHint(qg.QPainter.Antialiasing)
painter.setPen(outlinePen)
painter.drawEllipse(x + 1, y + 1, width - 2, width - 2)
painter.end()
return pixmap
我這是怎麼設置的像素圖內畫家
self.normalPaint = self.fancyDraw(self._penBorder)
self.hoverPaint = self.fancyDraw(self._penBorder)
def paintEvent(self, event):
painter = qg.QPainter(self)
painter.drawPixmap(qc.QRect(self.x(), self.y(), self.width(), self.width()),
self.normalPaint)
我不是一個專業的開發商,只是自學。這是我在stackoverflow中的第一個問題。對不起,如果有什麼是非常錯誤的。謝謝。