【QTdesigner】课时52.绘制各种图形（paintEevnt()））【pyqt5+QTdesigner模式】

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视频链接

P51课时52.绘制各种图形

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课程重点

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代码位置

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完整代码

'''

绘制各种图形

弧
圆形
椭圆
矩形（正方形）
多边形
绘制图像

'''

import sys,math
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

class DrawAll(QWidget):
    def __init__(self):
        super(DrawAll,self).__init__()
        self.resize(300,600)
        self.setWindowTitle('绘制各种图形')

    def paintEvent(self, event):
        qp = QPainter()
        qp.begin(self)

        qp.setPen(Qt.blue)

        # 绘制弧
        rect = QRect(0,10,100,100)
        # alen: 1个alen等于1/16度   45 * 16
        qp.drawArc(rect,0, 50 * 16)
        # 通过弧绘制圆
        qp.setPen(Qt.red)
        qp.drawArc(120,10,100,100,0, 360 * 16)

        # 绘制带弦的弧
        qp.drawChord(10,120,100,100,12,130*16)

        # 绘制扇形
        qp.drawPie(10,240,100,100,12,130*16)

        # 椭圆
        qp.drawEllipse(120,120,150,100)
        # 绘制5边形
        point1 = QPoint(140,380)
        point2 = QPoint(270,420)
        point3 = QPoint(290,512)
        point4 = QPoint(290,588)
        point5 = QPoint(200,533)

        polygon = QPolygon([point1,point2,point3,point4,point5])
        qp.drawPolygon(polygon)

        # 绘制图像
        image = QImage('./images/book1.png')
        rect = QRect(10, 400, image.width()/3, image.height()/3)
        qp.drawImage(rect,image)

        qp.end()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = DrawAll()
    main.show()
    sys.exit(app.exec_())

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遇到的问题

改写的时候，因为paintEevnt（）是专用方法，所以必须调用QWidget才能正常使用

因为我是用self.ui调用的窗口，所以这里和默认的paintEevnt（）方法不配套，所以最后不显示内容，好烦。。解决不了

哈哈，终于解决了，找到了一片文章：
>>>PyQt5学习笔记4_loadUi加载ui文件

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改写效果展示

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改写注意点

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改写代码（QTdesigner模式）

# -*- coding:utf-8 -*-
'''
@Author: knocky
@Blog: https://blog.csdn.net/zzx188891020
@E-mail: [email protected]
@File: class52.py
@CreateTime: 2020/5/16 19:47
'''

import sys
from PyQt5.QtWidgets import QApplication,QWidget
from PyQt5 import uic
from PyQt5.QtGui import *
from PyQt5.QtCore import *

class my_form(QWidget):
    def __init__(self):
        super().__init__()
        # self.ui = uic.loadUi("../ui_package/class52.ui")
        uic.loadUi('../ui_package/class52.ui', self)

    def paintEvent(self, QPaintEvent):
        print('1')
        qp = QPainter()
        qp.begin(self)

        qp.setPen(Qt.blue)

        # 绘制弧
        rect = QRect(0,10,100,100)
        # alen: 1个alen等于1/16度   45 * 16
        qp.drawArc(rect,0, 50 * 16)
        # 通过弧绘制圆
        qp.setPen(Qt.red)
        qp.drawArc(120,10,100,100,0, 360 * 16)

        # 绘制带弦的弧
        qp.drawChord(10,120,100,100,12,130*16)

        # 绘制扇形
        qp.drawPie(10,240,100,100,12,130*16)

        # 椭圆
        qp.drawEllipse(120,120,150,100)
        # 绘制5边形
        point1 = QPoint(140,380)
        point2 = QPoint(270,420)
        point3 = QPoint(290,512)
        point4 = QPoint(290,588)
        point5 = QPoint(200,533)

        polygon = QPolygon([point1,point2,point3,point4,point5])
        qp.drawPolygon(polygon)

        # 绘制图像
        image = QImage('../2.images/book1.png')
        rect = QRect(10, 400, int(image.width()/3), int(image.height()/3))
        qp.drawImage(rect,image)

        qp.end()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = my_form()
    main.show()
    sys.exit(app.exec_())