我有一个功能强大的绘图应用程序对图像进行分割。为此,我有两层,原始图像和我正在绘制的图像层。在
我现在想实现一个删除方法。我已经实现了撤销功能,但我也希望用户能够选择一个笔刷“颜色”,以便能够擦除特定的部分,如画笔中的橡皮擦。我原以为用不透明度的颜色来绘制是可能的,但结果就是没有画线。在
因此,我的目标是画一条线,删除图像层中的像素值,这样我就能看到底层图像
from PyQt5.QtWidgets import QApplication, QMainWindow, QMenuBar, QMenu, QAction
from PyQt5.QtGui import QIcon, QImage, QPainter, QPen
from PyQt5.QtCore import Qt, QPoint
from PyQt5.QtGui import QColor
import sys
class Window(QMainWindow):
def __init__(self):
super().__init__()
top = 400
left = 400
width = 800
height = 600
self.setWindowTitle("MyPainter")
self.setGeometry(top, left, width, height)
self.image = QImage(self.size(), QImage.Format_ARGB32)
self.image.fill(Qt.white)
self.imageDraw = QImage(self.size(), QImage.Format_ARGB32)
self.imageDraw.fill(Qt.transparent)
self.drawing = False
self.brushSize = 2
self.brushColor = Qt.black
self.lastPoint = QPoint()
self.change = False
mainMenu = self.menuBar()
changeColour = mainMenu.addMenu("changeColour")
changeColourAction = QAction("change",self)
changeColour.addAction(changeColourAction)
changeColourAction.triggered.connect(self.changeColour)
def mousePressEvent(self, event):
if event.button() == Qt.LeftButton:
self.drawing = True
self.lastPoint = event.pos()
def mouseMoveEvent(self, event):
if event.buttons() and Qt.LeftButton and self.drawing:
painter = QPainter(self.imageDraw)
painter.setPen(QPen(self.brushColor, self.brushSize, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
painter.drawLine(self.lastPoint, event.pos())
self.lastPoint = event.pos()
self.update()
def mouseReleaseEvent(self, event):
if event.button == Qt.LeftButton:
self.drawing = False
def paintEvent(self, event):
canvasPainter = QPainter(self)
canvasPainter.drawImage(self.rect(), self.image, self.image.rect())
canvasPainter.drawImage(self.rect(), self.imageDraw, self.imageDraw.rect())
def changeColour(self):
if not self.change:
# erase
self.brushColor = QColor(255,255,255,0)
else:
self.brushColor = Qt.black
self.change = not self.change
if __name__ == "__main__":
app = QApplication(sys.argv)
window = Window()
window.show()
app.exec()
在这个例子中,changeColour
函数中的self.brushColor
应该被赋予什么颜色?在
白色不是解决方案,因为在现实中,底部的图像是一个复杂的图像,因此我希望在擦除时使顶层再次“透明”。在
{{a1}必须用^ 1}来擦除^ 1}。在
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