Sourcecode Membuat Segitiga Rotate dan glut menu

Ini adalah percobaan membuat animasi mengunakan visual c++. Dimana coding ini akan membuat sebuah prongram yang membentuk segitiga yang berputar dan dapat diganti warnanya.

Sourcecodenya sebagai berikut:


#include GL/glut.h
#include stdio.h

#define RED 11
#define GREEN 12
#define BLUE 13

float angle = 0.0;
float red=1.0, blue=1.0, green=1.0;
int menu1,menu2,menu,flag;

void changeSize(int w, int h) {
if(h == 0)
h = 1;
float ratio = 1.0* w / h;

// Hapus koordinat sebelum di modifikasi
glMatrixMode(GL_PROJECTION);
glLoadIdentity();

// Set viewport
glViewport(0, 0, w, h);

// Set perspective.
gluPerspective(45,ratio,1,1000);
gluLookAt(0.0,0.0,5.0,
0.0,0.0,-1.0,
0.0f,1.0f,0.0f);
glMatrixMode(GL_MODELVIEW);
}

void renderScene(void) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glRotatef(angle,0.0,1.0,0.0);

glColor3f(red,green,blue);

glBegin(GL_TRIANGLES);
glVertex3f(-1.0,-1.0,0.0);
glVertex3f(1.0,0.0,0.0);
glVertex3f(0.0,1.0,0.0);
glEnd();
angle++;
glutSwapBuffers();
}

void processMenuEvents(int option) {
red = 0.0;
green = 0.0;
blue = 0.0;
switch (option) {
case RED : red = 1.0; break;
case GREEN : green = 1.0; break;
case BLUE : blue = 1.0; break;
}
}

void processSpecialKeys(int c, int x, int y) {
if (!flag) {
if (c == GLUT_KEY_F1) {
int x = glutGetMenu();
if (x == menu1)
glutSetMenu(menu2);
else
glutSetMenu(menu1);
glutAttachMenu(GLUT_RIGHT_BUTTON);
}
}
}

void createGLUTMenus() {
menu2 = glutCreateMenu(processMenuEvents);
glutAddMenuEntry("Blue",BLUE);
glutAddMenuEntry("Green",GREEN);
glutAddMenuEntry("Red",RED);

menu1 = glutCreateMenu(processMenuEvents);
glutAddMenuEntry("Red",RED);
glutAddMenuEntry("Green",GREEN);
glutAddMenuEntry("Blue",BLUE);
glutAttachMenu(GLUT_RIGHT_BUTTON);
}

void processMenuStatus(int status, int x, int y) {
if (status == GLUT_MENU_IN_USE)
flag = 1;
else
flag = 0;
}

void main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowPosition(100,100);
glutInitWindowSize(320,320);
glutCreateWindow("672004181");
glutDisplayFunc(renderScene);

glutIdleFunc(renderScene);
glutReshapeFunc(changeSize);
createGLUTMenus();
glutMenuStatusFunc(processMenuStatus);
glutSpecialFunc(processSpecialKeys);
glutMainLoop();
}
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Demikian sourcecodenya semoga berguna untuk tugas maupun pembelajaran anda. GBU