QOpenGL QTimer, how do I animate this?

[jessica101]

#include <QApplication>
#include <QWidget>
#include <QTimer>
#include <QPainter>
#include <QVector>
#include <QPointF>
#include <cmath>
 
class Triangle {
public:
    QPointF position;
    double angle; // Rotation angle
    double scale; // Scale factor
 
    Triangle(QPointF pos) : position(pos), angle(0), scale(1) {}
 
    void update() {
        // Update angle and scale for animation
        angle += 1; // Rotate by 1 degree
        scale = 1 + 0.5 * sin(M_PI * angle / 180); // Scale between 1 and 1.5
    }
};
 
class TriangleWidget : public QWidget {
    QVector<Triangle> triangles;
    QTimer timer;
 
public:
    TriangleWidget(QWidget *parent = nullptr) : QWidget(parent) {
        // Initialize triangles
        for (int i = 0; i < 10; ++i) {
            triangles.append(Triangle(QPointF(100 + i * 50, 100)));
        }
 
        // Set up the timer
        connect(&timer, &QTimer::timeout, this, &TriangleWidget::updateAnimation);
        timer.start(16); // Approximately 60 FPS
    }
 
protected:
    void paintEvent(QPaintEvent *) override {
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);
 
        for (const Triangle &triangle : triangles) {
            painter.save();
            painter.translate(triangle.position);
            painter.rotate(triangle.angle);
            painter.scale(triangle.scale, triangle.scale);
            painter.drawPolygon(QPolygonF() << QPointF(0, -20) << QPointF(-20, 20) << QPointF(20, 20));
            painter.restore();
        }
    }
 
private:
    void updateAnimation() {
        for (Triangle &triangle : triangles) {
            triangle.update();
        }
        update(); // Trigger a repaint
    }
};
 
int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    TriangleWidget window;
    window.resize(800, 600);
    window.show();
    return app.exec();
}

#include <QApplication>
#include <QWidget>
#include <QTimer>
#include <QPainter>
#include <QVector>
#include <QPointF>
#include <cmath>

class Triangle {
public:
    QPointF position;
    double angle; // Rotation angle
    double scale; // Scale factor

    Triangle(QPointF pos) : position(pos), angle(0), scale(1) {}
    
    void update() {
        // Update angle and scale for animation
        angle += 1; // Rotate by 1 degree
        scale = 1 + 0.5 * sin(M_PI * angle / 180); // Scale between 1 and 1.5
    }
};

class TriangleWidget : public QWidget {
    QVector<Triangle> triangles;
    QTimer timer;

public:
    TriangleWidget(QWidget *parent = nullptr) : QWidget(parent) {
        // Initialize triangles
        for (int i = 0; i < 10; ++i) {
            triangles.append(Triangle(QPointF(100 + i * 50, 100)));
        }

        // Set up the timer
        connect(&timer, &QTimer::timeout, this, &TriangleWidget::updateAnimation);
        timer.start(16); // Approximately 60 FPS
    }

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

        for (const Triangle &triangle : triangles) {
            painter.save();
            painter.translate(triangle.position);
            painter.rotate(triangle.angle);
            painter.scale(triangle.scale, triangle.scale);
            painter.drawPolygon(QPolygonF() << QPointF(0, -20) << QPointF(-20, 20) << QPointF(20, 20));
            painter.restore();
        }
    }

private:
    void updateAnimation() {
        for (Triangle &triangle : triangles) {
            triangle.update();
        }
        update(); // Trigger a repaint
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    TriangleWidget window;
    window.resize(800, 600);
    window.show();
    return app.exec();
}

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