/// OpenGL initializations
void init() {
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
// lighting setup
GLfloat mat_A[] = { 0.3, 0.3, 0.3, 1.0 };
GLfloat mat_D[] = { 0.5, 0.0, 0.75, 1.0 };
GLfloat mat_S[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat shine[] = { 128.0 };
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_A);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_D);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_S);
glMaterialfv(GL_FRONT, GL_SHININESS, shine);
GLfloat left_light_position[] = { 0.0f, 2.0f, 2.0f, 0.0f };
GLfloat right_light_position[] = { 0.0f, -2.0f, 2.0f, 0.0f };
GLfloat left_diffuse_light[] = { 1.0f, 1.0f, 1.0f, 1.0f };
GLfloat right_diffuse_light[] = { 1.0f, 1.0f, 1.0f, 1.0f };
glLightfv(GL_LIGHT0, GL_POSITION, left_light_position);
glLightfv(GL_LIGHT1, GL_POSITION, right_light_position);
glLightfv(GL_LIGHT0, GL_DIFFUSE, left_diffuse_light);
glLightfv(GL_LIGHT1, GL_DIFFUSE, right_diffuse_light);
glClearColor(1, 1, 1, 1);
glColor4f(1, 1, 0, 1);
rendermode = SMOOTH;
sceneT.identity();
std::time(&start);
frame = 0;
}
/// Implements the "zoomout" operation. Enlarges the view of the scene.
void zoomOut() {
AMatrix<float> mT;
mT.identity();
mT.scaling(1.0 / 1.2);
sceneT = mT*sceneT;
}
/// Mouse move function
void mousemove(int x, int y) {
if (buttonpressed == GLUT_MIDDLE_BUTTON) { // rotations handler
AMatrix<float> mT;
arcball.drag(x, winh - y, &mT);
sceneT = mT*sceneIniT;
}
else if (buttonpressed == GLUT_RIGHT_BUTTON) { // translations handler
double xw, yw, zw;
screenToWorld(x, winh - y, xw, yw, zw);
AMatrix<float> mT;
mT.identity();
mT.translation(xw - xwini, yw - ywini, zw - zwini);
sceneT = mT*sceneIniT;
}
else if (buttonpressed == GLUT_LEFT_BUTTON) {
Point2 p(x, winh - y);
stroke.push_back(p);
}
glutPostRedisplay();
}
