[筆記]rectangle and point

今天作的函式化的繪圖function



void rect(float ax,float ay,float bx,float by, float cx,float cy,float dx, float dy,float R,float G,float B)
{
     glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(R,G,B);
     glBegin(GL_POLYGON);
     glVertex2f(ax,ay);
     glVertex2f(bx,by);
     glVertex2f(cx,cy);
     glVertex2f(dx,dy);
     glEnd();        
}

void pt(float x,float y,float Size,float R,float G, float B)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(R,G,B);
glPointSize (Size);
glBegin(GL_POINTS);
glVertex2f(x,y);
glEnd();

}