/**
Arcos.
Mueva el mouse en sentido vertical y horizontal.
/ Emiliano Causa - Julio 2006
/ e_causa@yahoo.com.ar
/ www.emiliano-causa.com.ar
*/

void setup(){
  size(400,400);
  smooth();
  noFill(); 
  stroke(255);
  strokeWeight(5);
}
void draw(){
  fill(0,0,55,6);
  rect(-10,-10,420,420);
  float distancia = dist(mouseX,mouseY,pmouseX,pmouseY);
  float angulo = atan2(mouseY-pmouseY,mouseX-pmouseX);
  float diam = linea(distancia, -10 , 10 , 0 , 200);   
  arc(200, 200, diam, diam, angulo - HALF_PI/2, angulo + HALF_PI/2);    
}
float linea(float x , float x1 , float x2, float y1 , float y2 ){
  return (x-x1)/(x2-x1)*(y2-y1)+y1;
}