QPainter QPen QBrush

最新推荐文章于 2025-09-07 09:02:07 发布

转载最新推荐文章于 2025-09-07 09:02:07 发布 · 91 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：https://my.oschina.net/osyunwei/blog/717666

文章标签：

#ui #python

本文介绍了一个使用Qt进行自定义绘图的示例程序，通过不同的按钮选择绘制直线、椭圆和扇形。代码展示了如何利用QPainter进行抗锯齿处理，并设置画笔样式来绘制不同类型的图形。

2019独角兽企业重金招聘Python工程师标准>>>

#include "widget.h"
#include "ui_widget.h"
#include <QPainter>




Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    switch(this->drawShape)
    {
    case Widget::Line:
        painter.setPen(QPen(Qt::red,20));
        painter.drawLine(80,100,200,100);

        painter.setPen(QPen(Qt::black,20,Qt::SolidLine,Qt::RoundCap));
        painter.drawLine(80,180,480,180);

        painter.setPen(QPen(Qt::blue,20,Qt::SolidLine,Qt::RoundCap));
        painter.drawLine(80,280,650,280);
        break;
    case Widget::Ellipse:

        painter.setPen(QPen(Qt::yellow,15,Qt::SolidLine,Qt::SquareCap));
       // painter.setPen(QPen(Qt::yellow,15,Qt::DashDotLine,Qt::RoundCap));
        painter.setBrush(QBrush(Qt::blue));
        painter.drawEllipse(200,300,150,300);

        break;
    case Widget::Pie:
        painter.setPen(QPen(Qt::black,15,Qt::SolidLine,Qt::RoundCap,Qt::MiterJoin));
        painter.setBrush(QBrush(Qt::blue,Qt::DiagCrossPattern));
      //  painter.drawEllipse(80,80,400,240);
        painter.drawPie(80,80,400,240,10*10,300*16);
        break;
    }
}


void Widget::on_drawLinepushButton_clicked()
{
    drawShape = Widget::Line;
    update();
}

void Widget::on_EllispepushButton_clicked()
{
    drawShape = Widget::Ellipse;
    update();
}

void Widget::on_PiepushButton_clicked()
{
    drawShape = Widget::Pie;
    update();
}

转载于:https://my.oschina.net/osyunwei/blog/717666