Processing 1.0 - Processing Discourse - Slow down movement of connected "boids"

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Index › Programming Questions & Help › Programs › Slow down movement of connected "boids"

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Slow down movement of connected "boids" (Read 535 times)

MitraM

Slow down movement of connected "boids"
Mar 25^th, 2010, 1:58pm

hi,

i tried to introduce a button into my code that controls displaying the network-lines. that worked. the next step is now to slow down movement of connected boids, so that the pattern of the connected boids becomes stable after a while.

any ideas?? THX!

int mode = 0;
int gravitymode=0;

int n = 25; // amount of boids
int p = 25;
int o = 25;
int s = 25;
int a = 25;
float cDist = 50; // length of connecting lines
PImage imgred;

float inc = 0.01;

Boids[] boids = new Boids[n]; // array red

int canvasX = 700; // canvas size x-direction
int canvasY = 500; // canvas size y-direction

void keyPressed(){
if (key==' '){
noLoop();
}
if (key=='m'){
loop();
}

if (key=='h'){
mode=1;
}

if (key=='s'){
mode=0;
}
if (key=='g'){
gravitymode=1;
}

if (key=='r'){
gravitymode=0;
}
}

void setup() {

size(canvasX, canvasY);
smooth();

for (int i = 0; i < n; i++) { // boids red
boids[i] = new Boids(random(50,width-50),random(50,height-50));
}

imgred = loadImage("particlered.png");

}

void draw() {
background(0);
//stroke(234,45,65);
//strokeWeight(1);
for (int i = 0; i < n; i++) { // boids red update - display
if (mode==0){
boids[i].drawLine();
boids[i].update();
boids[i].display();
}else{
boids[i].drawnoLine();
boids[i].gravityupdate();
boids[i].display();
}
}
}

class Boids{

float ptsX;
float ptsY;
float posX;
float posY;
float posYY;
float posXX;
float ptsYY;
float ptsXX;

float inc = 0.001; // move increasement every loop
float inc2 =0.00001;

Boids (float _ptsX, float _ptsY){

ptsX = _ptsX;
ptsY = _ptsY;
posX = ptsX;
posY = ptsY;

// posXX = ptsXX;
//posYY = ptsYY;

}

void update(){

posX = noise(ptsX) * canvasX;
posY = noise(ptsY) * canvasY;
ptsX+=inc;
ptsY+=inc;
}

void gravityupdate(){
for (int i = 0; i < n-1; i++) {
Boids b=boids[i];
if (dist(posX, posY, b.posX, b.posY) > cDist) {
posX = noise(ptsX) * canvasX;
posY = noise(ptsY) * canvasY;
ptsX+=inc;
ptsY+=inc;
} else {
posX=300;
posY=300;
//posX =posXX;
//posY =posYY;
//posXX+=inc2;
//ptsYY+=inc2;
//posXX=posXX+1;
//posYY=posYY+1;
}
}
}

void display() { // rendering settings for boids
stroke (255);
strokeWeight(1);
imageMode(CENTER);
image(imgred, posX, posY);
//noStroke();
// ellipseMode(CENTER);
// fill(random (240,250), random (70,80), random (10,20),200);
// ellipse(posX, posY, 15,15);
}

void drawLine() {

for (int i = 0; i < n-1; i++) {
Boids b=boids[i];
if (dist(posX, posY, b.posX, b.posY) < cDist) {
line(posX, posY, b.posX, b.posY);

}
}
}

void drawnoLine() {
}

}

yconst

Re: Slow down movement of connected "boids"
Reply #1 - Mar 25^th, 2010, 2:41pm

Check this out (i altered your code a bit for the image):

Code:

int mode = 0; 
int gravitymode=0;

int n = 65;		// amount of boids
int p = 25;
int o = 25;
int s = 25;
int a = 25;
float cDist = 50;	// length of connecting lines
PImage imgred; 

 float inc = 0.01;

Boids[] boids = new Boids[n];			// array red


int canvasX = 700;     // canvas size x-direction 
int canvasY = 500;     // canvas size y-direction 


void keyPressed(){  
 if (key==' '){  
  noLoop();
 }
   if (key=='m'){  
  loop();
}

if (key=='h'){  
 mode=1; 
} 

if (key=='s'){  
 mode=0; 
}
if (key=='g'){  
 gravitymode=1; 
} 

if (key=='r'){  
 gravitymode=0; 
}
}



void setup() { 
   
size(canvasX, canvasY); 
smooth();
 
for (int i = 0; i < n; i++) {	// boids red
 boids[i] = new Boids(random(50,width-50),random(50,height-50)); 
}


imgred = loadImage("particlered.png"); 
     
}

void draw() {
background(0);
//stroke(234,45,65); 
//strokeWeight(1); 
 for (int i = 0; i < n; i++) {	// boids red update - display
  if (mode==0){ 
	boids[i].drawLine(); 
   boids[i].update();   
   boids[i].display();
  }else{ 
     boids[i].drawnoLine();
    boids[i].gravityupdate();     
   boids[i].display();
} 
}
}

class Boids{
 

 float ptsX; 
 float ptsY; 
 float posX; 
 float posY;
 float posYY;  
 float posXX; 
 float ptsYY; 
 float ptsXX; 

 float inc = 0.005;     // move increasement every loop
 float inc2 =0.00001;
 

 
Boids (float _ptsX, float _ptsY){ 
 
 ptsX = _ptsX;
 ptsY = _ptsY;
 posX = ptsX;
 posY = ptsY;
 
 
// posXX = ptsXX;
 //posYY = ptsYY;

}

void update(){

posX = noise(ptsX) * canvasX;
posY = noise(ptsY) * canvasY;
ptsX+=inc;
ptsY+=inc;
//inc*=1.04;
}
 
void gravityupdate(){
for (int i = 0; i < n-1; i++) { 
Boids b=boids[i];
    if (dist(posX, posY, b.posX, b.posY) > cDist) { 
	  posX = noise(ptsX) * canvasX;
	  posY = noise(ptsY) * canvasY;
	  ptsX+=inc;
	  ptsY+=inc;
	  } else { 
	    posX=300;
	    posY=300;	     
	    //posX =posXX;
	    //posY =posYY;
	    //posXX+=inc2;
	    //ptsYY+=inc2;
//posXX=posXX+1;
//posYY=posYY+1;
}
   }
  }

 

void display() {		 // rendering settings for boids
  stroke (255);
  strokeWeight(1);
     fill(255,0,0);
 ellipse( posX, posY,5,5); 
  //imageMode(CENTER);
 //image(imgred, posX, posY); 
  //noStroke();
 // ellipseMode(CENTER);
 // fill(random (240,250), random (70,80), random (10,20),200);
//  ellipse(posX, posY, 15,15);  
}


void drawLine() {

 for (int i = 0; i < n-1; i++) { 
  Boids b=boids[i];
  // Loop should also test whether b is not this boid.
     if (dist(posX, posY, b.posX, b.posY) < cDist && b!=this) { 
	 line(posX, posY, b.posX, b.posY); 
	 inc*=.98;//If we're close, reduce the speed.
     } 
   } 
 } 
 
void drawnoLine() {
}

}

You could prolly optimize your loops a bit cause now everything is performed twice: say you got 2 boids, b1 and b2: b1 will at somepoint perform the loop for p2 but then when p2's turn comes, it will perform the loop for p1, which is not necessary most of the times.

But it's a cool example. It reminds me a bit of that Diffusion Limited Aggregation, which produces complex forms.

Yiannis Chatzikonstantinou
volatile prototypes

MitraM YaBB Newbies Offline Posts: 5	Re: Slow down movement of connected "boids" Reply #2 - Mar 25^th, 2010, 4:25pm Wow, this is really helpful! Thanks a lot!!!

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