Figure 8

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Figure 8
Note: the two figures keep moving fast.
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// Animation1.cpp : Defines the entry point for the console application.
//
/*
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*/
#include "stdafx.h"
#include

int width=400, height=300, x=50, y=100;
bool straight=false;

void drawStraight()
{
glVertex2i(x,y); glVertex2i(x+150,y); glVertex2i(x+150,y+100); glVertex2i(x,y+100);
}
void drawOblique()
{
glVertex2i(x,y); glVertex2i(x+100,y+100); glVertex2i(x,y+150); glVertex2i(x-50,y+100);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glColor3f(1,0,0);
glBegin(GL_POLYGON);//triangle
glVertex2i(200,50); glVertex2i(300,150); glVertex2i(100,150);
glEnd();



glColor3f(0,1,0);
glBegin(GL_POLYGON);//rectangle
if(straight) drawStraight();
else drawOblique();
glEnd();

glFlush();
}
void idle()
{
if(straight){ x=50; y=100; straight=false;}
else{ x=100; y=50; straight=true;}
glutPostRedisplay();
}
void main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB);
glutInitWindowSize(width, height);
glutCreateWindow("Animation1, moving rectangle");
gluOrtho2D(0, width, height, 0);
glClearColor(0,0,0,0);
glutDisplayFunc(display);
glutIdleFunc(idle);
glutMainLoop();
}