/** Render the current frame */
private static void render() {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(30f, aspect, 1f, 10000000f);
float look = anchorL.z * 5;
gluLookAt(look, look, anchorL.z, 0, 0, 0, 0, 0, 1);
glClearColor(.5f, 0.5f, 0.5f, .5f);
// clear the screen
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
{
// int systemDimLength = cube.sideLength / 2;
// rotate square according to angle
glRotatef(angle, 0, 0, 1.0f);
// glColor3f(1f, 1f, 1f);
// cube.glSurfaceDraw();
/*
* Draw the particle in the system
*/
glColor3f(0.0f, 1.0f, 0.0f);
glPointSize(3.0f);
/*
* glBegin(GL_POINTS); { for (Particle p : system) {
* glVertex3f(p.x.x, p.x.y, p.x.z); } } glEnd();
*/
/*
* Draw the lines
*/
glLineWidth(2.0f);
for (Constraint p : constraints) {
glBegin(GL_LINES);
{
glVertex3f(p.getA().x.x, p.getA().x.y, p.getA().x.z);
glVertex3f(p.getB().x.x, p.getB().x.y, p.getB().x.z);
}
glEnd();
}
/*
* Shadows, just for effect!
*/
glColor4f(0, 0, 0, .5f);
/*
* glBegin(GL_POINTS); { for (Particle p : system) {
* glVertex3f(p.x.x, p.x.y, -systemDimLength); } } glEnd();
*/
/*
* Draw the line shadows
*/
for (Constraint p : constraints) {
glBegin(GL_LINES);
{
glVertex3f(p.getA().x.x, p.getA().x.y, -0);
glVertex3f(p.getB().x.x, p.getB().x.y, -0);
}
glEnd();
}
glBegin(GL_LINES);
{
glVertex3f(anchorL.x, anchorL.y, -0);
glVertex3f(anchorR.x, anchorR.y, -0);
}
glEnd();
glColor3f(1, 0, 0);
/*
* Draw the tension line
*/
glBegin(GL_LINES);
{
glVertex3f(anchorL.x, anchorL.y, -0);
glVertex3f(anchorL.x, anchorL.y, anchorL.z);
glVertex3f(anchorL.x, anchorL.y, anchorL.z);
glVertex3f(anchorR.x, anchorR.y, anchorR.z);
glVertex3f(anchorR.x, anchorR.y, anchorR.z);
glVertex3f(anchorR.x, anchorR.y, -0);
}
glEnd();
}
glPopMatrix();
}
/** Do all calculations, handle input, etc. */
private static void logic() {
if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) {
finished = true;
}
int dx = Mouse.getDX(), dy = Mouse.getDY(), dz = Mouse.getDWheel();
if (Mouse.isButtonDown(0) && Mouse.isInsideWindow()) {
Vector3 d = new Vector3(dx, dy, 0);
anchorL = anchorL.sub(d);
anchorR = anchorR.sub(d);
}
if (Mouse.isButtonDown(1) && Mouse.isInsideWindow()) {
Vector3 d = new Vector3(0, dy, 0);
anchorL = anchorL.sub(d);
anchorR = anchorR.add(d);
}
Vector3 zChange = new Vector3(0, 0, dz / 4);
anchorL = anchorL.add(zChange);
anchorR = anchorR.add(zChange);
/*
* Move those particles!
*/
// Clear force accumulator
for (Particle p : system) p.clearForces();
// Accumulate forces
for (Particle p : system) p.addForce(gravity);
// Integrate
for (Particle p : system) NewtonianIntegrators.verlet(p, stepSize);
/*
* Formal and informal constraint check.
*/
for (int i = 0; i < integrationIterations; i++) {
cloth[0][0][0].x = anchorL;
cloth[cloth[0].length / 2][0][0].x = anchorL.add(anchorR).scale(.5f);
cloth[cloth[0].length - 1][0][0].x = anchorR;
// bounds check
float dragFloat = 10;
Vector3 zFloor = new Vector3(0, 0, 1);
for (Particle p : system) {
if (p.x.z <= 0 + 1) {
p.x = p.x.add(zFloor);
p.xOld = p.x.add(p.xOld.scale(dragFloat)).scale(1f / (dragFloat + 1));
}
}
// for (Particle p : system) {
// if (cube.isWithin(p.x)) {
// cube.escape(p);
// }
// }
for (Constraint c : constraints) c.satisfy();
}
}
