/**
 * Mausfolgen
 * 
 * Die Maus malt eine orange Linie, die langsam verblasst.
 * muß wirklich noch verbessert werden
 */

int x0,y0,x1,y1,x2,y2;
boolean maus;
boolean anfang=true;
boolean stop=false;


int fill1=0 , fill2=3;
int hinter=42;

void setup() {

  size(600, 200);
  
  fill(fill1,fill2);
  stroke( 255, 223, 72);
  background(hinter);
  
  smooth();
  strokeWeight(6);
  frameRate(20);
  
}

void draw() {
  
 if (!stop) { 
   
  if (maus) {

    x2=mouseX;
    y2=mouseY;
    curve( x0,y0, x1,y1, x2,y2, x2,y2 );
    x0=x1;
    y0=y1;
    x1 = x2; 
    y1 = y2;

    maus = false;

  } // if maus

  rect(-4, -4, width+7, height+7);
  
 } // if !stop
 
}

void mouseMoved() {
  
  if ( abs(x2-mouseX)+abs(y2-mouseY)>2 ) { maus = true; }
  
  if (anfang) {
    x2=mouseX;
    y2=mouseY;
    x1 = x2; 
    y1 = y2;
    x0=x1;
    y0=y1;
    anfang = false;
  }  // if anfang
  
} // mausMoved

void mouseReleased() {
  
  if (mouseButton == LEFT) {
    
    fill(hinter,255);
    rect(-4, -4, width+7, height+7);
    fill(fill1,fill2);
    
    anfang = true;
    stop = false;
    x2=mouseX;
    y2=mouseY;
    x1 = x2; 
    y1 = y2;
    x0=x1;
    y0=y1;
    
  } else {
    stop = true;
  }
}