QT实现带缩放的坐标系

最新推荐文章于 2024-09-10 20:46:20 发布

CoderIsArt

最新推荐文章于 2024-09-10 20:46:20 发布

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分类专栏： QT 文章标签： qt

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#include <QApplication>
#include <QWidget>
#include <QPainter>
#include <QWheelEvent>
#include <cmath>

#define M_PI 3.14159265358979323846

class RulerWidget : public QWidget
{
public:
    RulerWidget(QWidget *parent = nullptr) : QWidget(parent), scaleFactor(1.0) { }

protected:
    void paintEvent(QPaintEvent *event) override
    {
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);

        painter.scale(scaleFactor, scaleFactor);

        int width = this->width() / scaleFactor;
        int height = this->height() / scaleFactor;

        // 绘制坐标轴
        drawArrow(painter, 50, height - 50, 50, 50); // Y轴
        drawArrow(painter, 50, height - 50, width - 50, height - 50); // X轴

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