pyqt5 图像上划线_PyQt5之QPen画笔类学习

QPen

QPen是一个基本的图形对象。它用于绘制矩形，椭圆，多边形或其他形状的线条，曲线和轮廓。

例子如下：

from PyQt5.Qt import QWidget, QApplication

from PyQt5.QtGui import QPainter, QPen

from PyQt5.QtCore import Qt

import sys

class Example(QWidget):

def __init__(self):

super().__init__()

self.initUI()

def initUI(self):

self.setGeometry(300, 300, 280, 270)

self.setWindowTitle('Pen styles')

self.show()

def paintEvent(self, e):

qp = QPainter()

qp.begin(self)

self.drawLines(qp)

qp.end()

#画线事件函数

def drawLines(self, qp):

#调用构造函数初始化

pen = QPen(Qt.black, 2, Qt.SolidLine)

qp.setPen(pen)

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

#画虚线

pen.setStyle(Qt.DashLine)

qp.setPen(pen)

qp.drawLine(20, 80, 250, 80)

#画虚点画线

pen.setStyle(Qt.DashDotLine)

qp.setPen(pen)

qp.drawLine(20, 120, 250, 120)

#画点线

pen.setStyle(Qt.DotLine)

qp.setPen(pen)

qp.drawLine(20, 160, 250, 160)

#画虚点点划线

pen.setStyle(Qt.DashDotDotLine)

qp.setPen(pen)

qp.drawLine(20, 200, 250, 200)

#画经典的虚线

pen.setStyle(Qt.CustomDashLine)

pen.setDashPattern([1, 4, 5, 4])

qp.setPen(pen)

qp.drawLine(20, 240, 250, 240)

#主函数

if __name__ == '__main__':

app = QApplication(sys.argv)

ex = Example()

sys.exit(app.exec_())

程序运行结果如下图：

from PyQt5.Qt import QWidget, QApplication

from PyQt5.QtGui import QPainter, QPen

from PyQt5.QtCore import Qt

import sys

class Example(QWidget):

def init(self):

super().init()

self.initUI()

def initUI(self):

self.setGeometry(300, 300, 280, 270)

self.setWindowTitle('Pen styles')

self.show()

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)

ex = Example()

sys.exit(app.exec_())

```

程序运行结果如下图：