private boolean collision(GravityObject GO) {
for (int i = 0; i < gravityObjectArray.length; i++) {
if (gravityObjectArray[i] != null) {
if (GO != gravityObjectArray[i]) {
double centerDistance =
Math.sqrt(
(Math.pow((GO.xP - gravityObjectArray[i].xP), 2))
+ (Math.pow((GO.yP - gravityObjectArray[i].yP), 2))); // <3 Pytagoras
if (centerDistance < GO.size + gravityObjectArray[i].size) {
if (GO.size > gravityObjectArray[i].size) {
GO.eat(gravityObjectArray[i]);
} else {
gravityObjectArray[i].eat(GO);
}
if (GO.size < gravityObjectArray[i].size) {
GO.remove();
} else {
gravityObjectArray[i].remove();
}
return true;
}
}
} else {
break;
}
}
return false;
}
static void drawTorus(float r, float R, int nsides, int rings) {
float ringDelta = 2.0f * (float) Math.PI / rings;
float sideDelta = 2.0f * (float) Math.PI / nsides;
float theta = 0.0f, cosTheta = 1.0f, sinTheta = 0.0f;
for (int i = rings - 1; i >= 0; i--) {
float theta1 = theta + ringDelta;
float cosTheta1 = (float) Math.cos(theta1);
float sinTheta1 = (float) Math.sin(theta1);
GL11.glBegin(GL11.GL_QUAD_STRIP);
float phi = 0.0f;
for (int j = nsides; j >= 0; j--) {
phi += sideDelta;
float cosPhi = (float) Math.cos(phi);
float sinPhi = (float) Math.sin(phi);
float dist = R + r * cosPhi;
GL11.glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
GL11.glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
GL11.glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
GL11.glVertex3f(cosTheta * dist, -sinTheta * dist, r * sinPhi);
}
GL11.glEnd();
theta = theta1;
cosTheta = cosTheta1;
sinTheta = sinTheta1;
}
}
private float[] randomColorArray() {
float[] array = new float[3];
array[0] = (float) Math.random();
array[1] = (float) Math.random();
array[2] = (float) Math.random();
return array;
}
private void drawVector() {
if (drawVector) {
for (int i = 0; i < gravityObjectArray.length; i++) {
if (gravityObjectArray[i] != null) {
GravityObject[] GOA = gravityObjectArray;
GravityObject GO = gravityObjectArray[i];
for (int j = 0; j < GOA.length; j++) {
if (GOA[j] != null
&& GOA[j].xP > 0
&& GOA[j].yP > 0
&& GOA[i].xP > 0
&& GOA[i].yP > 0) {
double distance =
Math.sqrt(
(Math.pow((GOA[j].xP - GOA[i].xP), 2))
+ (Math.pow((GOA[j].yP - GOA[i].yP), 2)));
double gravityForce =
gravConstant * (GOA[i].getMass() * GOA[j].getMass()) / Math.pow(distance, 2);
float[] gColAr = new float[3];
gColAr[0] = (float) (gravityForce * 1.3);
gColAr[1] = (float) (gravityForce * 1);
gColAr[2] = (float) (gravityForce * 1);
drawLine(
(int) (GOA[i].xP),
(int) (GOA[i].yP),
(int) (GOA[j].xP),
(int) (GOA[j].yP),
gColAr);
}
}
float[] sColAr = new float[3];
sColAr[0] = (float) (0.2);
sColAr[1] = (float) (0.2);
sColAr[2] = (float) (0);
drawLine(
((int) GO.xP),
((int) GO.yP),
((int) (GO.xP + GO.xV * (25))),
((int) (GO.yP + GO.yV * (25))),
sColAr);
}
}
}
}
private void drawCircle(double x, double y, int radius, float color[], float alpha) {
GL11.glColor4f(color[0], color[1], color[2], alpha);
float incr = (float) (2 * Math.PI / slices);
/*xCoord = xCoord + radius;
yCoord = yCoord + radius;*/
GL11.glBegin(GL11.GL_TRIANGLE_FAN);
for (int i = 0; i < slices; i++) {
float angle = incr * i;
float Xc = (float) (x + Math.cos(angle) * radius);
float Yc = (float) (y + Math.sin(angle) * radius);
GL11.glVertex2f(Xc, Yc);
}
GL11.glEnd();
}
private boolean gravityObjectCollision(int x, int y, int size) {
for (int i = 0; i < gravityObjectArray.length; i++) {
if (gravityObjectArray[i] != null) {
double centerDistance =
Math.sqrt(
(Math.pow((x - gravityObjectArray[i].xP), 2))
+ (Math.pow((y - gravityObjectArray[i].yP), 2))); // <3 Pytagoras
if (centerDistance <= size + gravityObjectArray[i].size) {
return true;
}
} else {
break;
}
}
return false;
}
public RenderEngine() {
glEnable(GL_DEPTH_TEST);
projection = new Matrix4().initPerspective((float) Math.toRadians(90), 16f / 9f, 0.001f, 1000);
}
private void applyPhysics() {
GravityObject[] GOA = gravityObjectArray;
for (int i = 0; i < GOA.length; i++) {
int c = 0;
if (GOA[i] != null) {
double[] xVelAr = new double[128];
double[] yVelAr = new double[128];
for (int j = 0; j < GOA.length; j++) {
if (GOA[j] != null) {
if (GOA[j].size != 0 && GOA[i].size != 0) {
if (i != j) {
double distance =
Math.sqrt(
(Math.pow((GOA[j].xP - GOA[i].xP), 2))
+ (Math.pow((GOA[j].yP - GOA[i].yP), 2)));
double gravityForce =
gravConstant * (GOA[i].getMass() * GOA[j].getMass()) / Math.pow(distance, 2);
// System.out.println("Gravitational force between "+i+" and "+ j+" is "+
// gravityForce);
double xDistance = GOA[j].xP - GOA[i].xP;
if (xDistance < 0) {
xDistance = GOA[i].xP - GOA[j].xP;
}
double yDistance = GOA[j].yP - GOA[i].yP;
if (yDistance < 0) {
yDistance = GOA[i].yP - GOA[j].yP;
}
// System.out.println("X, Y Distance: "+xDistance+" & "+yDistance);
double acceleration = gravityForce / GOA[i].getMass();
// System.out.println("Acceleration of object "+i+" is equal to "+acceleration);
// System.out.println("Object "+i+" moved towards "+j+" with a speed of:
// "+acceleration);
xVelAr[c] = (acceleration / (xDistance + yDistance)) * (GOA[j].xP - GOA[i].xP);
// System.out.println("xVelAr["+j+"] = ("+acceleration+" / ("+xDistance+" +
// "+yDistance+")) * ("+GOA[j].xP+" - "+GOA[i].xP+") En dat is: "+ xVelAr[j]);
yVelAr[c] = (acceleration / (xDistance + yDistance)) * (GOA[j].yP - GOA[i].yP);
c++; // C, C# etc...
}
}
} else {
break;
}
}
for (int k = 0; k < xVelAr.length; k++) {
double xTotalVel = 0;
if (xVelAr[k] != 0) {
xTotalVel += xVelAr[k];
} else {
break;
}
GOA[i].xV += xTotalVel;
}
for (int l = 0; l < xVelAr.length; l++) {
double yTotalVel = 0;
if (yVelAr[l] != 0) {
yTotalVel += yVelAr[l];
} else {
break;
}
GOA[i].yV += yTotalVel;
}
if (!collision(GOA[i])) {
GOA[i].move();
} else {
GOA[i].move();
// colliding is handled in collision()
}
} else {
break;
}
}
// Delete out of bounds spheres
for (int i = 0; i < gravityObjectArray.length; i++) {
if (gravityObjectArray[i] != null) {
if (gravityObjectArray[i].xP > screenWidth
|| gravityObjectArray[i].xP < 0
|| gravityObjectArray[i].yP > screenHeight
|| gravityObjectArray[i].yP < 0) {
gravityObjectArray[i].remove();
}
}
}
}