pyqt5讲解5：窗口绘图类控件QPainter,QPen,QBrush,QPixmap

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# @Author: yudengwu
# @Date  : 2020/8/20

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


class Drawing(QWidget):
    def __init__(self, parent=None):
        super(Drawing, self).__init__(parent)
        self.setWindowTitle("在窗口中绘制文字")
        self.setWindowIcon(QIcon("head.png"))
        self.resize(300, 200)
        self.text = "你好呀，总裁余"

    def paintEvent(self, event):
        painter = QPainter()
        painter.begin(self)
        # 自定义绘制方法
        self.draw_text(event, painter)
        painter.end()

    def draw_text(self, event, qp):
        # 设置画笔颜色
        qp.setPen(QColor(168, 34, 3))
        # 设置字体
        qp.setFont(QFont('SimSun', 20))
        # 绘制文字
        qp.drawText(event.rect(), Qt.AlignCenter, self.text)
if __name__ == "__main__":
    app = QApplication(sys.argv)
    demo = Drawing()
    demo.show()
    sys.exit(app.exec_())

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# @Author: yudengwu
# @Date  : 2020/8/20

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

class Drawing(QWidget):
    def __init__(self, parent=None):
        super(Drawing, self).__init__(parent)
        self.resize(300, 200)
        self.setWindowTitle("在窗口中画点")
        self.setWindowIcon(QIcon("limi.jpg"))
    def paintEvent(self, event):
        # 初始化绘图工具
        qp = QPainter()
        qp.begin(self)
        # 自定义画点方法
        self.drawPoints(qp)
        qp.end()

    def drawPoints(self, qp):
        qp.setPen(Qt.red)
        size = self.size()#判断当前窗口大小

        for i in range(1000):
            # 绘制正弦图形，周期 [-1000,1000]
            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
            qp.drawPoint(x, y)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = Drawing()
    win.show()
    sys.exit(app.exec_())

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

class Drawing(QWidget):
	def __init__(self):
		super().__init__()
		self.initUI()

	def initUI(self):   
		self.setGeometry(300, 300, 280, 270)
		self.setWindowTitle('钢笔样式例子')        

	def paintEvent(self, e): 
		qp = QPainter()
		qp.begin(self)
		self.drawLines(qp)
		qp.end()

	def drawLines(self, qp):
		pen = QPen(Qt.black, 2, Qt.SolidLine)

		qp.setPen(pen)
		qp.drawLine(20, 40, 250, 40)

		pen.setStyle(Qt.DashLine)
		qp.setPen(pen)
		qp.drawLine(20, 80, 250, 80)

		pen.setStyle(Qt.DashDotLine)
		qp.setPen(pen)
		qp.drawLine(20, 120, 250, 120)

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

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

		pen.setStyle(Qt.CustomDashLine)
		pen.setDashPattern([1, 4, 5, 4])
		qp.setPen(pen)
		qp.drawLine(20, 240, 250, 240)

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

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# -*- coding: utf-8 -*-
 
"""
    【简介】
    绘图中QBrush 的例子 ,绘制九个不同样式的矩形。
     
"""

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

class Drawing(QWidget): 
	def __init__(self):
		super().__init__()  
		self.initUI()

	def initUI(self):   
		self.setGeometry(300, 300, 365, 280)
		self.setWindowTitle('画刷例子')        
		self.show()

	def paintEvent(self, e): 
		qp = QPainter()
		qp.begin(self)
		self.drawLines(qp)
		qp.end()

	def drawLines(self, qp): 
		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.DiagCrossPattern)
		qp.setBrush(brush)
		qp.drawRect(10, 105, 90, 60)

		brush = QBrush(Qt.Dense5Pattern)
		qp.setBrush(brush)
		qp.drawRect(130, 105, 90, 60)

		brush = QBrush(Qt.Dense6Pattern)
		qp.setBrush(brush)
		qp.drawRect(250, 105, 90, 60)

		brush = QBrush(Qt.HorPattern)
		qp.setBrush(brush)
		qp.drawRect(10, 195, 90, 60)

		brush = QBrush(Qt.VerPattern)
		qp.setBrush(brush)
		qp.drawRect(130, 195, 90, 60)

		brush = QBrush(Qt.BDiagPattern)
		qp.setBrush(brush)
		qp.drawRect(250, 195, 90, 60)
                         		
if __name__ == '__main__':
	app = QApplication(sys.argv)
	demo = Drawing()
	demo.show()
	sys.exit(app.exec_())

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# -*- coding: utf-8 -*-

'''
    【简介】
	PyQt5中 QPixmap 例子
   
  
'''

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

if __name__ == '__main__':
	app = QApplication(sys.argv)
	win = QWidget()
	lab1 = QLabel()
	lab1.setPixmap(QPixmap("D:机器学习学习草稿duoren.jpg"))
	vbox=QVBoxLayout()
	vbox.addWidget(lab1)
	win.setLayout(vbox)
	win.setWindowTitle("QPixmap 例子")
	win.show()
	sys.exit(app.exec_())