小渣渣学习笔记 python day46【 PyQt5 画直线，画图形，画图片，画文字】

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内容图文

#绘制各种图形      #弧形    #椭圆    #圆    #矩形    #多边形    #绘制图像
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import math

class DrawAll(QWidget):
    def __init__(self):
        super(DrawAll,self).__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('绘制各种图形')
        self.resize(500,800)
    def paintEvent(self, QPaintEvent):
        painter = QPainter(self)
        painter.begin(self)
        painter.setPen(Qt.blue)
        rect = QRect(0,10,100,100)
        painter.drawArc(rect,0,50*16) #画弧

        painter.setPen(Qt.red)
        painter.drawArc(120,10,100,100,0,360*16) #画圆
        painter.drawChord(0,120,100,100,0,50*16) #画弦 0-50度
        painter.drawPie(120,120,100,100,15*16,130*16) #画扇形，右起15度到130度
        painter.drawEllipse(10,240,150,100) #椭圆 10 240是左上角  ，150的宽度和100的高度
        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])
        painter.drawPolygon(polygon) #多边形

        image = QImage('./python.jpg')#装载图像 QImage
        rect = QRect(10,600,image.width()/3,image.height()/3)
        painter.drawImage(rect,image)

        #画个表盘
        painter.drawArc(300,100,100,100,0,360*16)
        pointX = 350
        pointY= 150
        r = 50
        for i in range(1,13):
            x1 = pointX - math.cos(i*30/180*math.pi)*50
            y1 = pointY - math.sin(i*30/180*math.pi)*50
            x2 = pointX - math.cos(i * 30 / 180 * math.pi)*9/10*50
            y2 = pointY - math.sin(i * 30 / 180 * math.pi)*9/10*50
            painter.drawLine(x1,y1,x2,y2)
        painter.end()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = DrawAll()
    main.show()
    sys.exit(app.exec_())

#绘制直线
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import math

class DrawLines(QWidget):
    def __init__(self):
        super(DrawLines,self).__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('画直线')
        self.resize(300,200)
    def paintEvent(self, QPaintEvent):
        painter = QPainter(self)
        painter.begin(self)
        pen = QPen(Qt.red,3,Qt.SolidLine)
        painter.setPen(pen)
        painter.drawLine(20,40,250,40)

        pen.setStyle(Qt.DashLine)
        painter.setPen(pen)
        painter.drawLine(20,50,250,50)

        pen.setStyle(Qt.DashDotDotLine)
        painter.setPen(pen)
        painter.drawLine(20, 60, 250, 60)

        pen.setStyle(Qt.DotLine)
        painter.setPen(pen)
        painter.drawLine(20, 70, 250, 70)

        pen.setStyle(Qt.CustomDashLine) #自定义线类型
        pen.setDashPattern([1,4,8,4]) #分别代表 长度1 ，间隔1，长度2，间隔2，循环
        painter.setPen(pen)
        painter.drawLine(20, 80, 250, 80)

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

#用像素点绘制正弦曲线
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import math

class DrawPoints(QWidget):
    def __init__(self):
        super(DrawPoints,self).__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('窗口上用像素点绘制正弦曲线')
        self.resize(300,200)
    def paintEvent(self, QPaintEvent):
        painter = QPainter(self)
        painter.begin(self)
        size = self.size()
        num =10000
        for i in range(num):
            x = (size.width()-100)/2.0+100.0*i/num #变量是i 用i 来表示x 和 y ，这里给他限定一个周期的正弦曲线占用100宽和100高的空间
            y = size.height()/2.0-50*math.sin(math.pi*2.0*i/num)
            painter.drawPoint(x,y)
        painter.end()

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

#QPainter 绘制文字

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

class QPainterDemo(QWidget):
    def __init__(self):
        super(QPainterDemo,self).__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('QPainter Demo')
        self.resize(300,200)
        self.text = 'hello world'

    def paintEvent(self, event): #重写paintEvent方法 窗口改变，就会不断调用这个方法
        painter = QPainter() #创建QPainter对象
        painter.begin(self) #开始 加参数
        painter.setPen(QColor(150,43,5)) #设置画笔
        painter.setFont(QFont('Arial',20))#设置字体
        painter.drawText(event.rect(),Qt.AlignCenter,self.text)
        painter.end() #结束

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

内容总结

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