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@CSchoel
Created January 27, 2015 13:30
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Snow falling on a randomly generated mountain
//Autor: Christopher Schölzel
float FRONT_WIDTH = 20;
class Snowflake {
float noiseX;
float noiseY;
float x,y;
float vx,vy;
float w;
Snowflake(float x, float y, float vx, float vy, float w) {
this.x = x;
this.y = y;
this.vx = vx;
this.vy = vy;
this.w = w;
noiseX = random(1000);
noiseY = random(1000);
}
void move() {
/*vx += 0.1*(noise((noiseX++)*0.1)-0.5);
vy += 0.05*(noise((noiseY++)*0.1)-0.5);*/
vx += random(-0.1,0.1);
vy += random(-0.1,0.1);
vy = max(vy,0.5);
vy = min(vy,5);
vx = max(vx,-3);
vx = min(vx, 3);
x += vx;
y += vy*w/FRONT_WIDTH;
if(!visible() && y > 0) reset();
}
void reset() {
y = -w;
x = random(width);
vx = random(-3,3);
vy = random(0.5,3);
}
boolean visible() {
return x > -w && x < width+w && y > -w && y < height+w;
}
void display() {
fill(255);
noStroke();
ellipse(x,y,w,w);
}
}
ArrayList<Snowflake> snow;
void setup() {
size(600,400);
snow = new ArrayList<Snowflake>();
int flakes = 400;
for(int i = 0; i < flakes; i++) {
Snowflake sf = new Snowflake(
random(width),-10-random(height),
random(-3,3),0.2+random(2),
5+random(15)
);
snow.add(sf);
}
}
void draw() {
background(0);
for(int i = 0; i < width; i++) {
float n = 300*noise(i*0.01);
stroke(180);
line(i,height/2.0+n,i,height);
}
for(Snowflake s : snow) {
s.move();
s.display();
}
}
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