PyQt5绘制图形（圆、矩形、斜矩形、多边形）

矩形

from PyQt5.QtCore import Qt, QRect
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtWidgets import QWidget, QApplicationclass DrawRect(QWidget):def __init__(self, parent=None):super(DrawRect, self).__init__(parent)self.resize(600, 400)self.start_point = Noneself.end_point = Noneself.start = Falseself.drawing = Falseself.setCursor(Qt.CrossCursor)self.setMouseTracking(True)def paintEvent(self, event):super(DrawRect, self).paintEvent(event)if self.drawing:painter = QPainter()painter.begin(self)pen = QPen(Qt.red, 5)painter.setPen(pen)painter.drawRect(QRect(self.start_point, self.end_point))painter.end()def mousePressEvent(self, event):if not self.start:self.start_point = event.pos()self.start = Truedef mouseReleaseEvent(self, event):if self.drawing:self.drawing = Falseself.start = Falsedef mouseMoveEvent(self, event):if self.start:self.end_point = event.pos()self.drawing = Trueself.update()if __name__ == '__main__':app = QApplication([])demo = DrawRect()demo.show()app.exec_()

圆

import mathfrom PyQt5.QtCore import Qt
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtWidgets import QWidget, QApplicationclass DrawRect(QWidget):def __init__(self, parent=None):super(DrawRect, self).__init__(parent)self.resize(600, 400)self.start_point = Noneself.end_point = Noneself.start = Falseself.drawing = Falseself.radius = 0self.setCursor(Qt.CrossCursor)self.setMouseTracking(True)def paintEvent(self, event):super(DrawRect, self).paintEvent(event)if self.drawing:painter = QPainter()painter.begin(self)pen = QPen(Qt.red, 5)painter.setPen(pen)painter.drawEllipse(self.start_point, self.radius, self.radius)painter.end()def mousePressEvent(self, event):if not self.start:self.start_point = event.pos()self.start = Truedef mouseReleaseEvent(self, event):if self.drawing:self.drawing = Falseself.start = Falsedef mouseMoveEvent(self, event):if self.start:self.end_point = event.pos()self.radius = self.calc_radius()self.drawing = Trueself.update()def calc_radius(self):return math.sqrt((self.start_point.x() - self.end_point.x()) ** 2 + (self.start_point.y() - self.end_point.y()) ** 2)if __name__ == '__main__':app = QApplication([])demo = DrawRect()demo.show()app.exec_()

斜矩形

from PyQt5.QtCore import Qt, QPointF, QLineF
from PyQt5.QtGui import QPainter, QPen, QPolygonF
from PyQt5.QtWidgets import QWidget, QApplicationclass DrawRect(QWidget):def __init__(self, parent=None):super(DrawRect, self).__init__(parent)self.resize(600, 400)self.point1 = Noneself.point2 = Noneself.cursor_point = Noneself.point_count = 0self.line = Noneself.polygon = Noneself.end = Falseself.is_line = Falseself.is_polygon = Falseself.setCursor(Qt.CrossCursor)self.setMouseTracking(True)def paintEvent(self, event):super(DrawRect, self).paintEvent(event)if self.is_polygon and self.polygon:painter = QPainter()painter.begin(self)pen = QPen(Qt.red, 5)painter.setPen(pen)painter.drawPolygon(self.polygon)painter.end()elif self.is_line and self.line:painter = QPainter()painter.begin(self)pen = QPen(Qt.red, 5)painter.setPen(pen)painter.drawLine(self.line)painter.end()def mousePressEvent(self, event):if self.point_count == 0:self.point1 = event.pos()self.point_count = 1elif self.point_count == 1:self.point2 = event.pos()self.point_count = 2def mouseReleaseEvent(self, event):if self.end:self.end = Falseself.point_count = 0def mouseMoveEvent(self, event):if self.point_count == 1:self.is_line = Trueself.is_polygon = Falseself.point2 = event.pos()self.calc_line()if self.point_count == 2:self.cursor_point = event.pos()self.calc_polygon()self.end = Trueself.is_line = Falseself.is_polygon = Trueself.update()def calc_line(self):self.line = QLineF(self.point1, self.point2)def calc_polygon(self):point_list = [self.point1, self.point2]x1 = self.point1.x()y1 = self.point1.y()x2 = self.point2.x()y2 = self.point2.y()x3 = self.cursor_point.x()y3 = (x2 ** 2 - 2 * x1 * x2 + y2 ** 2 - 2 * y1 * y2 + y2 ** 2 + x2 ** 2 - 2 * x2 * x3 + 2 * x1 * x3) / (2 * y2 - 2 * y1)# 参考链接：https://blog.csdn.net/zhouschina/article/details/14647587dx = x2 - x3dy = y2 - y3if abs(dx) < 0.00000001 and abs(dy) < 0.00000001:returnu = (self.cursor_point.x() - x2) * (x2 - x3) + (self.cursor_point.y() - y2) * (y2 - y3)u = u / ((dx * dx) + (dy * dy))x3 = x2 + u * dxy3 = y2 + u * dypoint3 = QPointF(x3, y3)point_list.append(point3)x4 = x1 + x3 - x2y4 = y1 + y3 - y2point4 = QPointF(x4, y4)point_list.append(point4)self.polygon = QPolygonF(point_list)if __name__ == '__main__':app = QApplication([])demo = DrawRect()demo.show()app.exec_()

多边形

from PyQt5.QtCore import Qt, QLineF
from PyQt5.QtGui import QPainter, QPen, QPolygonF
from PyQt5.QtWidgets import QWidget, QApplicationclass DrawPolygon(QWidget):def __init__(self, parent=None):super(DrawPolygon, self).__init__(parent)self.resize(600, 400)self.setCursor(Qt.CrossCursor)self.setMouseTracking(True)self.line_list = []self.point_list = []self.cursor_point = Noneself.end_point = Nonedef paintEvent(self, event):super(DrawPolygon, self).paintEvent(event)if not self.point_list:returnif self.end_point:painter = QPainter()painter.begin(self)pen = QPen(Qt.red, 5)painter.setPen(pen)polygon = QPolygonF(self.point_list)painter.drawPolygon(polygon)painter.end()returnif len(self.point_list) == 1:painter = QPainter()painter.begin(self)pen = QPen(Qt.red, 5)painter.setPen(pen)line = QLineF(self.point_list[0], self.cursor_point)painter.drawLine(line)painter.end()else:painter = QPainter()painter.begin(self)pen = QPen(Qt.red, 5)painter.setPen(pen)polygon = QPolygonF(self.point_list + [self.cursor_point])painter.drawPolygon(polygon)painter.end()def mousePressEvent(self, event):if self.end_point:# 重新开始绘制self.point_list = []self.end_point = Noneself.point_list.append(event.pos())self.update()def mouseDoubleClickEvent(self, event) -> None:self.end_point = event.pos()self.point_list.append(self.end_point)self.update()def mouseMoveEvent(self, event):self.cursor_point = event.pos()self.update()if __name__ == '__main__':app = QApplication([])demo = DrawPolygon()demo.show()app.exec_()

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PyQt5绘制图形（圆、矩形、斜矩形、多边形）

矩形

圆

斜矩形

多边形

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