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void setup(){
size(400,400);

background(250);
noStroke();
smooth();
}
void draw(){
if(mousePressed){
maru(mouseX,mouseY,pmouseX,pmouseY);
}
}
void maru(float a, float b,int px,int py){
float speed = abs(a-px)+abs(b-py);
for(float i = speed; i > 0; i --){
fill(random(200)-(i*2.8),random(200)-(i*2.8),random(200)-(i*2.8));
ellipse(a,b,i,i);
}
}