Add 'paintboard.py'

paintboard.py

@@ -0,0 +1,82 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+import sys
+from PyQt5.QtWidgets import QWidget, QApplication
+from PyQt5.QtGui import QPixmap, QPainter, QPen, QColor
+from PyQt5.QtCore import Qt, QPoint, QSize
+
+class PaintBoard(QWidget):
+    def __init__(self, Parent = None, Size = QSize(320, 240), Fill = QColor(255,255,255,255)):
+        super().__init__(Parent)
+    
+        # 初始化参数
+        self.__size = Size                  # 画板尺寸
+        self.__fill = Fill                  # 画板默认填充颜色
+
+        self.__thickness = 18               # 默认画笔粗细
+        self.__penColor = QColor(0,0,0,255)   # 默认画笔颜色
+
+        self.__begin_point = QPoint()
+        self.__end_point = QPoint()
+
+        # 初始化画板界面
+        self.__board = QPixmap(self.__size)
+        self.__board.fill(Fill) 
+        self.setFixedSize(self.__size)
+        self.__painter = QPainter()         # 新建绘图工具
+
+
+    # 清空画板
+    def Clear(self):
+        self.__board.fill(self.__fill)
+        self.update()
+
+    def setBoardFill(self, fill):
+        self.__fill = fill
+        self.__board.fill(fill)
+        self.update()
+    
+    # 设置画笔颜色    
+    def setPenColor(self, color):
+        self.__penColor = color
+
+    # 设置画笔粗细    
+    def setPenThickness(self, thickness=10):    
+        self.__thickness = thickness  
+
+    # 获取画板QImage类型图片
+    def getContentAsQImage(self):
+        image = self.__board.toImage()
+        return image 
+
+    # 双缓冲绘图，绘图事件
+    def paintEvent(self, paintEvent):         
+        self.__painter.begin(self)
+        self.__painter.drawPixmap(0,0,self.__board)
+        self.__painter.end()
+
+    def mousePressEvent(self, mouseEvent):
+        if mouseEvent.button() == Qt.LeftButton:
+            self.__begin_point = mouseEvent.pos()
+            self.__end_point = self.__begin_point
+            # self.update()
+
+    def mouseMoveEvent(self, mouseEvent):
+        if mouseEvent.buttons() == Qt.LeftButton:
+            self.__end_point = mouseEvent.pos()
+
+            # 画入缓冲区
+            self.__painter.begin(self.__board)
+            self.__painter.setPen(QPen(self.__penColor,self.__thickness))  
+            self.__painter.drawLine(self.__begin_point, self.__end_point)
+            self.__painter.end()
+
+            self.__begin_point = self.__end_point
+            self.update()
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    demo = PaintBoard()
+    demo.show()
+    sys.exit(app.exec_())