使用QPainterPath类绘制图形

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本文介绍了在QT环境中如何使用QPainterPath类来绘制图形。通过创建QGraphicsView对象,设置QGraphicsScene,然后利用QPainterPath的各种函数绘制复杂图形,最终在QGraphicsView中展示绘制结果。

使用QPainterPath类绘制图形

在QT中,QPainterPath类提供了一组用于绘图的函数,可以帮助我们绘制各种复杂的图形。在本文中,我们将学习如何使用QPainterPath类来绘制图形。

  1. 在QT中创建一个新的工程,并在主窗口中添加一个QGraphicsView对象。

  2. 在主窗口的构造函数中创建一个QGraphicsScene对象,并将其设置为QGraphicsView的场景。

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    // 创建场景对象
    QGraphicsScene *scene = new QGraphicsScene;

    // 设置场景大小
    scene->setSceneRect(0, 0, 800, 600);

    // 设置场景为视图的场景
    ui->graphicsView->setScene(scene);
}
  1. 创建QPainterPath对象,并使用它来绘制图形。
void MainWindow::paintEvent(QPaintEvent *event)
{
    // 创建QPainterPath对象
    QPainterPath path;

    // 移动到某一点
    path.moveTo(100, 100);

    // 绘制一条线
    path.lineTo(200, 100);

    /
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