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/**
* metaballs (low resolution)
*
* @author aa_debdeb
* @date 2016/06/24
*/
int num = 10;
ArrayList<Particle> particles;
int cellNum = 100;
float cellSize = 5;
float[][] cells;
void setup(){
size(500, 500);
cells = new float[cellNum + 1][cellNum + 1];
particles = new ArrayList<Particle>();
for(int i = 0; i < num; i++){
particles.add(new Particle());
}
}
void draw(){
background(0, 0, 26);
for(int y = 0; y < cellNum + 1; y++){
for(int x = 0; x < cellNum + 1; x++){
PVector c = new PVector(x * cellSize, y * cellSize);
cells[x][y] = 0.0;
for(Particle p: particles){
cells[x][y] += p.radious / PVector.sub(c, p.loc).mag();
}
}
}
for(int y = 0; y < cellNum; y++){
for(int x = 0; x < cellNum; x++){
float v = (cells[x][y] + cells[x + 1][y] + cells[x][y + 1] + cells[x + 1][y + 1]) / 4.0;
float alpha = map(v, 0.8, 1.2, 0, 255);
noStroke();
fill(255, 236, 230, alpha);
rect(x * cellSize, y * cellSize, cellSize, cellSize);
}
}
for(Particle p: particles){
p.update();
}
}
class Particle{
float radious;
PVector loc, vel;
Particle(){
radious = random(10, 20);
loc = new PVector(random(radious, width - radious), random(radious, height - radious));
float velSize = random(2, 5);
float velAng = random(TWO_PI);
vel = new PVector(velSize * cos(velAng), velSize * sin(velAng));
}
void update(){
loc.add(vel);
if(loc.x < radious){
vel.x *= -1;
loc.x += vel.x;
}
if(loc.x >= width - radious){
vel.x *= -1;
loc.x += vel.x;
}
if(loc.y < radious){
vel.y *= -1;
loc.y += vel.y;
}
if(loc.y >= height - radious){
vel.y *= -1;
loc.y += vel.y;
}
}
}