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Quellcode

#include "glwidget.h"
#include <gl/GLU.h>

GLWidget::GLWidget(QWidget *parent) : QGLWidget(parent)
{
}

void GLWidget::initializeGL()
{
    glDisable(GL_TEXTURE_2D);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_COLOR_MATERIAL);
    glEnable(GL_BLEND);
    glEnable(GL_POLYGON_SMOOTH);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glClearColor(0, 0, 0, 0);
}

void GLWidget::resizeGL(int w,int h)
{
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0f,(GLfloat)w/(GLfloat)h,0.1f,100.0f);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

}

Quellcode

void GLWidget::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glColor3f(12,22,0);


    glBegin(GL_POLYGON);
    glVertex2f(-0.1f,0.1f);
    glVertex2f(-0.1f,-0.1f);
    glVertex2f(0.1f,-0.1f);
    glVertex2f(0.1f,0.1f);
    glEnd();

    glLoadIdentity();
    glTranslatef(0.0f,0.0f,-2.0f);
}

void GLWidget::movePolygon()
{
    glLoadIdentity();
    glTranslatef(1.0f,0.0f,-5.0f);
    updateGL();
}

Quellcode

void GLWidget::mouseMoveEvent(QMouseEvent *event)
{
    float x = event->x();
    cout << event->x() << "=x";
    glLoadIdentity();

    if(x < 175)
    {
        glTranslatef(x/100 - 0.9f,0.0f,0.0f);
    }
    else
    {
        glTranslatef(0.9f,0.0f,0.0f);
    }
       updateGL();
}