glTranslatef在glBegin中不起作用.. glEnd

问题描述

我正在尝试并排绘制不同颜色的2个正方形，我的问题是我无法让glTranslatef将第二个正方形向右移动，第二个正方形只是在第一个正方形之上绘制.

I'm trying to draw 2 squares side by side of different colours, my problem is I can't get glTranslatef to move my second square to the right, the second square just draws over the first.

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);   
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glPointSize(10);

    glBegin(GL_QUADS);

        glColor3f(0.0,1.0,0.0);
        drawSquare();

        glTranslatef(10,0,0);

        glColor3f(1.0,0.0,0.0);
        drawSquare();

    glEnd();    

    glFlush();  // Process all OpenGL routines
}

void drawSquare()
{
    glVertex3f(0,0,0);
    glVertex3f(10,0,0);
    glVertex3f(10,10,0);
    glVertex3f(0,10,0);
}

推荐答案

您无法在glBegin/glEnd块内进行翻译，您已将其分为两个块.

You cannot translate inside a glBegin/glEnd block, you have break it up into two blocks.

我建议您开始在代码中使用glGetError()，它将帮助您发现这样的错误.

I recommend to start using glGetError() in your code, it will help you find mistakes like this.

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