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#include <stdlib.h>
#include <stdio.h>
#include <GL\glut.h>
#define ESCAPE 27
GLfloat xt = 1.0, yt = 1.0 ;
GLint window;
void init (void)
{
glClearColor (1.0, 1.0, 1.0, 0.0);
glLineWidth(2.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, 500.0, 0.0, 500.0);
}
void myDisplay(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glTranslatef(xt, yt, 0.0);
glBegin(GL_POLYGON);
glColor3f(1.0,0.0,0.0);
glVertex2f(75.0,50.0);
glVertex2f(125.0,50.0);
glVertex2f(150.0,100.0);
glVertex2f(100.0,125.0);
glVertex2f(50.0,100.0);
glEnd();
glPopMatrix();
glutSwapBuffers();
glFlush();
}
void KeyboardAssign(GLubyte key, GLint x, GLint y)
{
switch(key)
{
case ESCAPE :
printf ("escape pressed. exit. \n");
glutDestroyWindow(window);
exit(0);
break;
case 'x' :
xt += 10.0;
glutPostRedisplay();
break;
case 'z' :
xt -= 10.0;
glutPostRedisplay();
break;
case 'y' :
xt -= 10.0;
glutPostRedisplay();
break;
case 't' :
xt -= 10.0;
glutPostRedisplay();
break;
case '2' :
xt *= 2.0;
yt *= 2.0;
glutPostRedisplay();
break;
case '3' :
xt *= 3.0;
yt *= 3.0;
glutPostRedisplay();
break;
defalut:
break;
}
}
void main (int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowPosition(50,50);
glutInitWindowSize(500,500);
glutCreateWindow("Translation : x=right, z=left, y=up, y=down, 2=double, 3=triple");
init();
glutDisplayFunc(myDisplay);
glutIdleFunc(myDisplay);
glutKeyboardFunc(KeyboardAssign);
glutMainLoop();
}
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