Python学习笔记：PYQT5 文字及绘图旋转

import sys

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class window(QMainWindow):
    def __init__(self):
        super(window,self).__init__()
        self.setWindowTitle('旋转文字')
        self.setGeometry(300,300,800,600)
        print(self.geometry())

        self.rect = QRect(250, 250, 100, 100)

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

        painter.drawRect(self.rect)

        painter.setFont(QFont("Arial", 10))
        painter.drawText(self.rect, Qt.AlignCenter, "Hello Qt!")
        painter.drawRect(self.rect)
        print(self.geometry())

        pen = QPen()
        pen.setColor(QColor(255, 0, 0))
        pen.setWidth(4)
        painter.setFont(QFont("Arial", 10))
        painter.setPen(pen)
#------------------------画坐标--------------------------------------------------------------------------------------
        painter.drawLine(700,50,700,500)
        for i in range(10):
            y = i*50 + 50
            painter.drawLine(700, y, 730, y)

        painter.translate(0, 0)                              # 以QPoint(0,0)为旋转中点  画布原x 轴变为y轴 原y軕变为x軕
        painter.rotate(90)                                   #画布旋转90度

        for i in range(10):
            y = i*50+45
            painter.drawText(y,-750,str(i))                  # xy轴交换重新计算坐标点标识坐标值，另交换后Y轴为负值

        painter.transform()
#--------------------------------------画仪表-----------------------------------------------------------------------------------
        painter.translate(300, 300)

        for i in range(61):
            painter.translate(300, 300)
            painter.rotate(6*i)
            pen.setWidth(3)
            if ((6*i)%45 == 0):
                pen.setColor(QColor(255,0,0))
                pen.setWidth(8)
            else:
                pen.setColor(QColor(0, 0, 0))
                pen.setWidth(3)
            painter.setPen(pen)
            painter.drawLine(0,-200,0,-220)
            painter.resetTransform()


        pen.setWidth(1)
        painter.setPen(pen)
        rect = QRect(70,70,460,460)
        painter.drawRect(rect)

        pen.setWidth(50)
        pen.setColor(QColor(255,255,0))
        painter.setPen(pen)
        painter.drawArc(rect,16*6,77*16)

        pen.setWidth(50)
        pen.setColor(QColor(255, 0, 0))
        painter.setPen(pen)
        painter.drawArc(rect, 96*16, 80*16 )



        painter.end()



if __name__=='__main__':
    app = QApplication(sys.argv)
    form = window()
    form.show()
    app.exec_()