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_())