collision problem with floating bubbles

Programming Questions

madsky

collision problem with floating bubbles

in Programming Questions • 1 year ago

hi again,

i know maybe i ask too much but i should really know where my problem is.. my firends and teachers in my university have no idea what processing is.. maybe they heard about it, but they cant be helpful.

so; my code was only one bubble, now there are many. and i wrote a void collision() but it seems it doesnt effective.

i'm sure that my void collision() is true, and i dont see any fail messages. i saw a collision example, and i just want my bubbles have the same collision effect. am i missing something?

here is my code:

int numBlob = 15;
float spring = 0.005;
float gravity = 0.0003;
float friction = -0.9;
Blob[] blobs = new Blob[numBlob];
void setup()
{
size(1000, 600);
stroke(0);
smooth();
//noStroke();
frameRate(320);
for(int i = 0; i < numBlob; i++)
{
blobs[i] = new Blob(25,random(10,70),50,50,random(10, 90),i,blobs);
}
/*blobs[0] = new Blob(41,52,6,22,random(20, 40),blobs);
blobs[1] = new Blob(41,52,6,22,blobs);
blobs[2] = new Blob(30, 35,2,33,blobs);
blobs[3] = new Blob(12, 30,25,30,blobs);
blobs[4] = new Blob(66, 10,6,24,blobs);
blobs[5] = new Blob(10, 10,6,22,blobs);
blobs[6] = new Blob(20, 20,12,35,blobs);
*/
}
void draw()
{
fill(118, 0, 0,50);
//background(#C95F45);
rect(0, 0, width, height);
strokeWeight(0.001);
for (int i = 0; i < numBlob; i++)
{
blobs[i].collide();
blobs[i].move();
blobs[i].ciz();
}
}
class Blob
{
float vx = 0;
float vy = 0;
int id;
float diameter;
float ci_x = random(1,30);
float ci_y = random(1,30);
/*float ci_x;
float ci_y;*/
float move_x = noise(50);
float move_y = noise(50);
float currentx;
float currenty;
float num = random(50);
int Segments;
float buyuk;
Blob[] others;
Blob(int seg, float b, float cx, float cy, float din, int idin, Blob[] oin)
{
currentx = width / 2;
currenty = height / 2;
ci_x = cx;
ci_y = cy;
Segments = seg;
buyuk = b;
diameter = din;
id = idin;
others = oin;
}
void move()
{
/*vy += gravity;
ci_x += vx;
ci_y += vy;*/
if (ci_x + diameter/2 > width) {
ci_x = width - diameter/2;
move_x = -move_x;
move_x *= friction;
}
if (ci_y + diameter/2 > height) {
ci_y = height - diameter/2;
move_y = -move_y;
move_y *= friction;
}
if (ci_x - diameter/2 < 0) {
//ci_x = 0;
ci_x = diameter/2;
move_x = -move_x;
move_x *= friction;
}
if (ci_y - diameter/2 < 0) {
//ci_y = 0;
ci_y = diameter/2;
move_y = -move_y;
move_y *= friction;
}
}
void ciz() {
translate(width * noise(num+30), height * noise(num+70));
rotate(20 * noise(num+10));
num = num + 0.0009;
float x[] = new float[Segments];
float y[] = new float[Segments];
for (int i=0; i<Segments; i++) {
//float reb = random(5);
float angle = float(i) / float(Segments) * TWO_PI;
float distance = buyuk + 5 * noise(i, frameCount/80.0);
x[i] = ci_x + sin(angle) * distance+30;
y[i] = ci_y + cos(angle) * distance+30;
}
beginShape();
fill(200);
for (int i=0; i<Segments+4; i++) {
curveVertex(x[i % Segments], y[i % Segments]);
}
endShape();
resetMatrix();
}
void collide()
{
for (int i = id + 1; i < numBlob; i++) {
float dx = others[i].ci_x - ci_x;
float dy = others[i].ci_y - ci_y;
float distance = sqrt(dx*dx + dy*dy);
float minDist = others[i].diameter/2 + diameter/2;
if (distance < minDist) {
float angle2 = atan2(dy, dx);
float targetX = ci_x + cos(angle2) * minDist;
float targetY = ci_y + sin(angle2) * minDist;
float ax = (targetX - others[i].ci_x) * spring;
float ay = (targetY - others[i].ci_y) * spring;
vx -= ax;
vy -= ay;
others[i].vx += ax;
others[i].vy += ay;
}
}
}
}

Replies(3)

amnon.owed

Re: collision problem with floating bubbles

1 year ago

The problem is that your ciz() function is not visualizing the Blobs based on their position. You can see this yourself by commenting out collide() and move(). As you will notice the Blobs are still moving in the same way they were before. When you look at the ciz() function this is confirmed. It seems the position is determined by the lines below, which are both completely independent from the position of the Blob, but rather based on noise and a num variable.

translate(width * noise(num+30), height * noise(num+70));
rotate(20 * noise(num+10));

madsky

Re: collision problem with floating bubbles

1 year ago

i think my ciz() func. is for moving the blobs and for their segments. some blobs are following each other, but rest are moving independetly.

i thought in this line +30 and +70 are moving line of bubbles..if i delete these two numbers, bubbles are moving only between top left and bottom right. and i use translate for every bubble should not be on each other. sorry for my english, i hope i can explained what i mean.

translate(width * noise(num+30), height * noise(num+70));

amnon.owed

Re: collision problem with floating bubbles

1 year ago

In a sense you are correct. Your current translate function is indeed moving your Blobs. The noise function returns values between 0 and 1. Since it is multiplied with width and height respectively the Blobs will be moved within the dimensions of the window. The numbers 30 and 70 do not move the Blobs, but they make sure the noise function returns a different result and thus the x and y position are different. The fact that all the different Blobs have a different position is due to the fact that each has their own num (which is randomly set to somewhere between 0 and 50). If you just want moving Blobs like this you can delete the collide and move functions from your class and all the variables associated with them, since they serve no purpose.

However if you want collision, you need movement based on a position that changed based on velocity etc. On closer inspection I noticed you have copy-pasted the collision function from the BouncyBubbles examples. Just dragging and dropping in code won't work, because right now there is little interaction between the variables and functions in your class. For example you have several variables related to the x position: ci_x, move_x and currentx. But as mentioned earlier, you are not using them anywhere to control/display the position of your Blob. Similarly your copy-pasted collision code doesn't affect variables related to the position.

My advice is to look more in detail at the BouncyBubbles example and especially at how the different functions and variables interact with each other. Try changing some of the code in that example and see the effects. Once you understand better how that example works, it will be easier to integrate and/or use it's code.

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