Morphing pada OpenGL

sesuai janji pada tulisan sebelumnya,, kita akan belajar morphing menggunakan openGL seperti yang telah dibahas kemaren. Morphing secara sederhana dapat dilakukan dengan menggunakan interpolasi linier, nah langsung contoh ya kawan

#include “stdafx.h”
#include <stdlib.h>
#include <windows.h>
#include <GL/glut.h>
int a=0,b=0,c=0,d=0,e=0,f=0,g=0,h=0,i=0,j=0,k=0,l=0;

int rumus(int x1, int y1, int x2, int y2, int x){
int y=(x*(y2-y1)+x2*y1-x1*y2)/(x2-x1);
return y;
}

void tampilkan(){
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0,0,0,0);
glLoadIdentity();
glBegin(GL_QUADS);
glColor3f(0.0,0.0,1.0);
glVertex2d(2,2);
glVertex2d(5,2);
glVertex2d(8+c,11);
glVertex2d(7+d,rumus(7,14,2,11,7+d));
glEnd();
glBegin(GL_QUADS);
glVertex2d(7+e,rumus(7,14,5,11,7+e));
glVertex2d(9+f,rumus(9,14,2,11,9+f));
glVertex2d(14+g,rumus(14,2,2,14,14+g));
glVertex2d(11+h,rumus(11,2,5,14,11+h));
glEnd();
glBegin(GL_QUADS);
glVertex2d(6+i,rumus(6,5,5,2,6+i));
glVertex2d(6+j,rumus(6,7,12,2,6+j));
glVertex2d(10+k,rumus(10,7,12,5,10+k));
glVertex2d(10+l,rumus(10,5,5,5,10+l));
glEnd();
glFlush();
Sleep(500);
if(8+c>5){
c–;
}
if(7+d>2){
d–;
}
if(7+e>5){
e–;
}
if(9+f>2){
f–;
}
if(14+g>2){
g–;
}
if(11+h>5){
h–;
}
if(6+i>5){
i–;
}
if(6+j<12){
j++;
}
if(10+k<12){
k++;
}
if(10+l>5){
l–;
}
}

void init (void)
{
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0,16,0,16);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize (500,500); //Ukuran window
glutCreateWindow (“Morphing_Alifah 09032”);
glutDisplayFunc(tampilkan);
init ();
glutIdleFunc(tampilkan);
glutMainLoop();
return 0;
}