绘制图像

绘制文本

'''

绘图API：绘制文本

1. 文本
2. 各种图形（直线，点，椭圆，弧，扇形，多边形等）
3. 图像

QPainter

painter = QPainter()

painter.begin()

painter.drawText(...)

painter.end()


必须在paintEvent事件方法中绘制各种元素


'''

import sys
from PyQt5.QtWidgets import QApplication,QWidget
from PyQt5.QtGui import QPainter,QColor,QFont
from PyQt5.QtCore import Qt

class DrawText(QWidget):
    def __init__(self):
        super(DrawText,self).__init__()
        self.setWindowTitle('在窗口上绘制文本')
        self.resize(300,200)
        self.text = "Python从菜鸟到高手"
    def paintEvent(self, event):
        painter = QPainter(self)
        painter.begin(self)
        painter.setPen(QColor(150,43,5))
        painter.setFont(QFont('SimSun',25))

        painter.drawText(event.rect(),Qt.AlignCenter,self.text)
        painter.end()

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

绘制像素点

'''

用像素点绘制正弦曲线

-2PI  2PI

drawPoint(x,y)

'''

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

class DrawPoints(QWidget):
    def __init__(self):
        super(DrawPoints,self).__init__()
        self.resize(300,300)
        self.setWindowTitle('在窗口上用像素点绘制2个周期的正弦曲线')

    def paintEvent(self, event):
        painter = QPainter()
        painter.begin(self)
        painter.setPen(Qt.blue)
        size = self.size()

        for i in range(1000):
            x = 100 * (-1 + 2.0 * i/1000) + size.width()/2.0
            y = -50 * math.sin((x - size.width()/2.0) * math.pi/50) + size.height()/2.0
            painter.drawPoint(x,y)

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

绘制不同类型直线

'''

绘制不同类型的直线



'''

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

class DrawMultiLine(QWidget):
    def __init__(self):
        super(DrawMultiLine,self).__init__()
        self.resize(300,300)
        self.setWindowTitle('设置Pen的样式')

    def paintEvent(self, event):
        painter = QPainter()
        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, 80, 250, 80)

        pen.setStyle(Qt.DashDotDotLine)
        painter.setPen(pen)
        painter.drawLine(20, 120, 250, 120)

        pen.setStyle(Qt.DotLine)
        painter.setPen(pen)
        painter.drawLine(20, 160, 250, 160)

        pen.setStyle(Qt.DashDotDotLine)
        painter.setPen(pen)
        painter.drawLine(20, 200, 250, 200)

        pen.setStyle(Qt.CustomDashLine)
        pen.setDashPattern([1,10,5,8])
        painter.setPen(pen)
        painter.drawLine(20, 240, 250, 240)


        size = self.size()



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

绘制各种图形

'''

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)
        #image.save('./images/book1.png')
        qp.drawImage(rect,image)

        qp.end()


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

画刷填充图形区域

'''

用画刷填充图形区域

'''

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

class FillRect(QWidget):
    def __init__(self):
        super(FillRect,self).__init__()
        self.resize(600,600)
        self.setWindowTitle('用画刷填充区域')

    def paintEvent(self,e):
        qp = QPainter()
        qp.begin(self)
        brush = QBrush(Qt.SolidPattern)
        qp.setBrush(brush)
        qp.drawRect(10,15,90,60)

        brush = QBrush(Qt.Dense1Pattern)
        qp.setBrush(brush)
        qp.drawRect(130,15,90,60)

        brush = QBrush(Qt.Dense2Pattern)
        qp.setBrush(brush)
        qp.drawRect(250,15,90,60)

        brush = QBrush(Qt.Dense3Pattern)
        qp.setBrush(brush)
        qp.drawRect(10, 105, 90, 60)

        brush = QBrush(Qt.HorPattern)
        qp.setBrush(brush)
        qp.drawRect(130, 105, 90, 60)
        qp.end()

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