NeHe教程Qt实现——lesson02

NeHe 系列教程之二： 绘制多边形

英文教程地址：lesson02

本课在第一课的代码基础上添加了绘制多边形的代码，具体如下：

void MyGLWidget::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);  // Clear The Screen And The Depth Buffer
    glLoadIdentity();       // Reset The Current Modelview Matrix

    glTranslatef(-1.5f,0.0f,-6.0f);     // Move Left 1.5 Units And Into The Screen 6.0
    glBegin(GL_TRIANGLES);                      // Drawing Using Triangles
        glVertex3f( 0.0f, 1.0f, 0.0f);              // Top
        glVertex3f(-1.0f,-1.0f, 0.0f);              // Bottom Left
        glVertex3f( 1.0f,-1.0f, 0.0f);              // Bottom Right
    glEnd();                            // Finished Drawing The Triangle

    glTranslatef(3.0f,0.0f,0.0f);                   // Move Right 3 Units
    glBegin(GL_QUADS);                      // Draw A Quad
           glVertex3f(-1.0f, 1.0f, 0.0f);              // Top Left
           glVertex3f( 1.0f, 1.0f, 0.0f);              // Top Right
           glVertex3f( 1.0f,-1.0f, 0.0f);              // Bottom Right
           glVertex3f(-1.0f,-1.0f, 0.0f);              // Bottom Left
    glEnd();                            // Done Drawing The Quad
}

运行效果如下所示：