QBrush

QBrush也是图像的一个基本元素。是用来填充一些物体的背景图用的,比如矩形,椭圆,多边形等。有三种类型:预定义、渐变和纹理。
#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
ZetCode PyQt5 tutorial 
This example draws nine rectangles in different
brush styles.
Author: Jan Bodnar
Website: zetcode.com 
Last edited: August 2017
"""
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QBrush
from PyQt5.QtCore import Qt
import sys
class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):  
        self.setGeometry(300, 300, 355, 280)
        self.setWindowTitle('Brushes')
        self.show()
    def paintEvent(self, e):
        qp = QPainter()
        qp.begin(self)
        self.drawBrushes(qp)
        qp.end()
    def drawBrushes(self, qp):
        brush = QBrush(Qt.SolidPattern)
        qp.setBrush(brush)
        qp.drawRect(10, 15, 90, 60)
        brush.setStyle(Qt.Dense1Pattern)
        qp.setBrush(brush)
        qp.drawRect(130, 15, 90, 60)
        brush.setStyle(Qt.Dense2Pattern)
        qp.setBrush(brush)
        qp.drawRect(250, 15, 90, 60)
        brush.setStyle(Qt.DiagCrossPattern)
        qp.setBrush(brush)
        qp.drawRect(10, 105, 90, 60)
        brush.setStyle(Qt.Dense5Pattern)
        qp.setBrush(brush)
        qp.drawRect(130, 105, 90, 60)
        brush.setStyle(Qt.Dense6Pattern)
        qp.setBrush(brush)
        qp.drawRect(250, 105, 90, 60)
        brush.setStyle(Qt.HorPattern)
        qp.setBrush(brush)
        qp.drawRect(10, 195, 90, 60)
        brush.setStyle(Qt.VerPattern)
        qp.setBrush(brush)
        qp.drawRect(130, 195, 90, 60)
        brush.setStyle(Qt.BDiagPattern)
        qp.setBrush(brush)
        qp.drawRect(250, 195, 90, 60)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

我们画了9个不同的矩形。

brush = QBrush(Qt.SolidPattern)
qp.setBrush(brush)
qp.drawRect(10, 15, 90, 60)

创建了一个笔刷对象,添加笔刷样式,然后调用drawRect()方法画图。

下一节:可以使用PyQt5的QPainterPath创建贝塞尔曲线。绘画路径是由许多构建图形的对象,具体表现就是一些线的形状,比如矩形,椭圆,线和曲线。