exercise 2.1 balloons

[Densou]

Below is my solution for exercise 2.1, balloons.

//code by Densou //email: tzdensou@gmail.com

Balloon[] balloons= new Balloon[10];

void setup(){ size(600,400); smooth(); for(int i=0; i<balloons.length;i++){ balloons[i]= new Balloon(i); }

}

void draw(){ background(200,40,60);

for(int i=0; i<balloons.length;i++){ balloons[i].render(); balloons[i].update(); balloons[i].checkCollision(); }

}

class Balloon{ //v for velocity //f for acceleration of flotage //r for acceleration of resistance //l for location //a for total acceleration //wind force PVector v, f, l, a, wind; //w,h:size of this balloon //stringl:string length //sw: string swing range //maxV stands for the max velocity a balloon can reach-- //when gracity and flotage get balance float w,h, maxV,stringl,sw; //covenient for array int array; //color of each balloon color c;

Balloon(int array){ v= new PVector(0,0); //f= new PVector(0,-0.02); //f minus 0.01, in case acceleration too small f= new PVector(0,random(0.02)-1-0.01); maxV= 2.5; w=random(15)+30; h=random(10)+w1.2; //l= new PVector(width/2,height); l = new PVector(random(width),random(height/2)+height*.5); stringl=80.0; sw=40; array=array; c=color(random(150)+100,random(150)+100,random(150)+100); //c=color(array%3150,(array+2)%3150,(array+1)%3*150); }

void update(){ wind= new PVector((noise(1,frameCount/200)-0.5)0.04,(noise(2,frameCount/200)-0.5)0.01); a=PVector.add(f,wind);//use static function here, otherwise a increases. //println(a.x,a.y); v.add(a); l.add(v); //println(v.y); v.limit(2.2); //if(v.y>maxV ){ // v.y=maxV; //}else if(v.y<-maxV){ // v.y=-maxV; //} }

void render(){ pushMatrix(); translate(l.x,l.y+h/2); //swinging string stroke(242,192,86); strokeWeight(1); noFill(); float t=frameCount/500.0; bezier( 0,0, 0,noise(1,array,t)stringl-stringl/2, noise(2,array,t)sw-sw/2,noise(3,array,t)stringl0.6, noise(4,array,t)sw-sw/2,noise(5,array,t)stringl );

//balloon ball
//fill(220,30,100);
fill(c);
noStroke();
//ellipse(l.x,l.y,w,h);
ellipse(0,-h/2,w,h);
popMatrix();

}

void checkCollision(){ if(l.y<h/2){ v.y=v.y-0.8; f.y=f.y0.8; if(v.y<0.02 && -0.02<v.y){ v.y=0; f.y=0; l.y=h/2; } } //println(v.y); if(l.x<w/2 || l.x>width-w/2){ v.x=v.x*-0.6; }
} }