Add Qpainter

Author: zkep

QPainter/Data/qt-logo.png

@@ -0,0 +1,93 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2022年12月12日
+@site: https://pyqt.site , https://github.com/PyQt5
+@description: QPainter画图
+"""
+import sys
+try:
+    from PyQt5.QtWidgets import QApplication, QWidget, qApp
+    from PyQt5.QtGui import QPainter, QFont, QColor, QPixmap
+    from PyQt5.QtCore import Qt, pyqtSignal
+    from PyQt5.Qt import QPoint, QPolygon
+except ImportError:
+    from PySide2.QtWidgets import QApplication, QWidget, qApp
+    from PySide2.QtGui import QPainter, QFont, QColor, QPixmap
+    from PySide2.QtCore import Qt, pyqtSignal
+    from PySide2.Qt import QPoint, QPolygon
+
+
+
+class draw(QWidget):
+
+
+    drawsig = pyqtSignal(bool)
+
+    def __init__(self):
+        super(draw, self).__init__()
+        self.setWindowTitle("QPainter画图")
+        self._painter = QPainter()
+        self.scale = 1.0
+        self.pixmap = QPixmap()
+        self.setMouseTracking(True)
+        self.setFocusPolicy(Qt.WheelFocus)
+        self.drawEnable = False
+        self.points = []
+        self.current_points = []
+        self.drawsig.connect(self.setDrawEnable)
+
+
+    def setDrawEnable(self, enable=False):
+        self.drawEnable = enable
+        self.update()
+
+    def mouseMoveEvent(self, ev):
+        if self.drawEnable:
+            def in_end_range(curr, first):
+                return first.x() - 5 <= curr.x() <= first.x() + 5 and first.y() - 5 <= curr.y() <= first.y() + 5
+
+            if len(self.current_points) > 0 and in_end_range(ev.pos(), self.current_points[0]):
+                self.current_points.append(self.current_points[0])
+                self.points.append(self.current_points)
+                self.current_points = []
+            else:
+                self.current_points.append(ev.pos())
+        elif len(self.current_points) > 0:
+            self.current_points.append(ev.pos())
+            self.points.append(self.current_points)
+            self.current_points = []
+
+        self.update()
+
+    def mousePressEvent(self, ev):
+        if Qt.LeftButton & ev.button():
+            self.drawsig.emit(True)
+    def mouseReleaseEvent(self, ev):
+        if Qt.LeftButton & ev.button():
+            self.drawsig.emit(False)
+
+    def paintEvent(self, ev):
+        if len(self.points) <= 0 and len(self.current_points) <= 0 :  return
+        p = self._painter
+        p.begin(self)
+        p.setRenderHint(QPainter.Antialiasing)
+        p.setRenderHint(QPainter.HighQualityAntialiasing)
+        p.setRenderHint(QPainter.SmoothPixmapTransform)
+        p.scale(self.scale, self.scale)
+        p.setPen(QColor(0, 0, 0))
+        for pts in self.points:
+            p.drawPolyline(QPolygon(pts))
+        if len(self.current_points) > 0:
+            p.drawPolyline(QPolygon(self.current_points))
+        p.end()
+
+
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    mainWin = draw()
+    mainWin.show()
+    sys.exit(app.exec_())
+

QPainter/Draw.py

@@ -1 +1,16 @@
-# QPainter
+# QPainter
+
+
+- 目录
+  - [利用QPainter绘制各种图形](#QPainter绘制各种图形)
+  - [简易画板](#简易画板)
+  
+## 1、QPainter绘制各种图形
+[运行 StockDialog.py](StockDialog.py)
+
+![CountDownClose](ScreenShot/StockDialog.gif)
+
+## 2、简易画板
+[运行 Draw.py](Draw.py)
+
+![CustomColorIcon](ScreenShot/Draw.gif)