The Interactive Image (Fall 2004)

Code

float[] xlines = new float[50];
float[] ylines = new float[50];

void setup(){
  size(400,400);
  framerate(20);
  smooth();
}

float bounce = .8;
float speed = .7;
float ltx,lty,lax,lay,lvx,lvy,lx,ly;
float r,ar,vr,angle;
boolean paused = false;

void loop(){
  background(255);
  if(!paused){
    angle = atan2(mouseX-pmouseX,mouseY-pmouseY);
  }
  ar = (angle-r)*bounce;
  vr += ar;
  vr *= speed;
  r += vr;
  translate(mouseX,mouseY);
  rotate(r);
  for(int i=xlines.length-1;i>0;i--){
    xlines[i] = xlines[i-1];
    //strokeWeight(5*(100-i)/100);
    stroke(i*5);
    line(xlines[i]-mouseX,-height*2,xlines[i]-mouseX,height*2);
  }
  for(int i=ylines.length-1;i>0;i--){
    ylines[i] = ylines[i-1];
    //strokeWeight(ceil(5-(i/ylines.length)*5));
    stroke(i*5);
    line(-width*2,ylines[i]-mouseY,width*2,ylines[i]-mouseY);
  }
  rotate(-r);
  ltx = constrain(mouseX,0,width);
  lty = constrain(mouseY,0,height);
  lax = (ltx-lx)*bounce;
  lay = (lty-ly)*bounce;
  lvx += lax;
  lvy += lay;
  lvx *= speed;
  lvy *= speed;
  lx += lvx;
  ly += lvy;
  xlines[0] = lx;
  ylines[0] = ly;
}

void keyPressed(){
  if(key=='s'){
    save("hundredlines.tif");
  }
}

void mousePressed(){
  if(paused){
    paused = false;
  }else{
    paused = true;
  }
}