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81 lines
2.4 KiB
81 lines
2.4 KiB
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import sys
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from PyQt5.QtWidgets import QWidget, QApplication
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from PyQt5.QtGui import QPixmap, QPainter, QPen, QColor
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from PyQt5.QtCore import Qt, QPoint, QSize
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class PaintBoard(QWidget):
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def __init__(self, Parent = None, Size = QSize(320, 240), Fill = QColor(255,255,255,255)):
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super().__init__(Parent)
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# 初始化参数
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self.__size = Size # 画板尺寸
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self.__fill = Fill # 画板默认填充颜色
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self.__thickness = 18 # 默认画笔粗细
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self.__penColor = QColor(0,0,0,255) # 默认画笔颜色
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self.__begin_point = QPoint()
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self.__end_point = QPoint()
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# 初始化画板界面
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self.__board = QPixmap(self.__size)
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self.__board.fill(Fill)
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self.setFixedSize(self.__size)
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self.__painter = QPainter() # 新建绘图工具
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# 清空画板
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def Clear(self):
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self.__board.fill(self.__fill)
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self.update()
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def setBoardFill(self, fill):
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self.__fill = fill
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self.__board.fill(fill)
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self.update()
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# 设置画笔颜色
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def setPenColor(self, color):
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self.__penColor = color
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# 设置画笔粗细
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def setPenThickness(self, thickness=10):
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self.__thickness = thickness
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# 获取画板QImage类型图片
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def getContentAsQImage(self):
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image = self.__board.toImage()
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return image
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# 双缓冲绘图，绘图事件
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def paintEvent(self, paintEvent):
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self.__painter.begin(self)
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self.__painter.drawPixmap(0,0,self.__board)
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self.__painter.end()
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def mousePressEvent(self, mouseEvent):
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if mouseEvent.button() == Qt.LeftButton:
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self.__begin_point = mouseEvent.pos()
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self.__end_point = self.__begin_point
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# self.update()
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def mouseMoveEvent(self, mouseEvent):
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if mouseEvent.buttons() == Qt.LeftButton:
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self.__end_point = mouseEvent.pos()
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# 画入缓冲区
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self.__painter.begin(self.__board)
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self.__painter.setPen(QPen(self.__penColor,self.__thickness))
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self.__painter.drawLine(self.__begin_point, self.__end_point)
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self.__painter.end()
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self.__begin_point = self.__end_point
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self.update()
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if __name__ == '__main__':
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app = QApplication(sys.argv)
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demo = PaintBoard()
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demo.show()
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sys.exit(app.exec_()) |