在Qt中渲染圆锥体

#include <QtWidgets>
#include <QtOpenGL>

class GLWidget : public QGLWidget {
public:
    GLWidget(QWidget *parent = nullptr) : QGLWidget(parent) {}

protected:
    void initializeGL() override {
        glClearColor(0, 0, 0, 1);
    }

    void resizeGL(int w, int h) override {
        glViewport(0, 0, w, h);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(45, (float)w / h, 0.1, 100);
        glMatrixMode(GL_MODELVIEW);
    }

    void paintGL() override {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glLoadIdentity();
        gluLookAt(0, 0, 5, 0, 0, 0, 0, 1, 0);

        // 渲染圆锥体
        GLUquadric *quadric = gluNewQuadric();
        gluCylinder(quadric, 1, 0, 2, 20, 20);
        gluDeleteQuadric(quadric);
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    GLWidget widget;
    widget.resize(800, 600);
    widget.show();

    return app.exec();
}