用vc搭建框架用openGl函数画正方形的问题 wxh zt

wxhwhmanshan

我已经用vc搭好了一个基于OpenGL的程序框架，然后在myDrawScene()函数中添加了如下代码：
void CLineView::myDrawScene()
{

glClearColor(1.0f,1.0f,1.0f,0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0,0.0,1.0);
glOrtho(-1.0,1.0,-1.0,1.0,-1.0,1.0);
glBegin(GL_POLYGON);
glVertex2f(-0.5,-0.5);
glVertex2f(-0.5,0.5);
glVertex2f(0.5,0.5);
glVertex2f(0.5,-0.5);
glEnd();
glFlush();
_sleep(2000);

}
执行以后没见到画出的正方形，但是我改变glClearColor()中的颜色值以后窗口的颜色会随之改变，但就是画不出图形来，一头雾水，有哪位高手能帮忙解决呢

wingser

切换距阵模式后再glortho,这是一个投影距阵函数,不要用在modelview距阵上
void CLineView::myDrawScene()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0,0.0,1.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0,1.0,-1.0,1.0,-1.0,1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glBegin(GL_POLYGON);
glVertex2f(-0.5,-0.5);
glVertex2f(-0.5,0.5);
glVertex2f(0.5,0.5);
glVertex2f(0.5,-0.5);
glEnd();
glFlush();
_sleep(2000);
}