float[][] anpts = {
  new float[] { 
    250f, 150f   }
  ,new float[] { 
    250f,  250f   }
};
float[][] cvpts = {
  new float[] {
     350f, 150f   }
  ,new float[] { 
     350f,250f   }
};
char [] ad = {
  'a', 'd'};
char [] bc = {
  'b', 'c'};
Handle[] anchors = new Handle[2];
Handle[] curvs = new Handle[2];
PFont myFont;
String  string ;
float squishy = 0.0;
PSlider slider1 ;
color bkColor = color(220,255,255);

void setup() {
  size( 600, 500 );
  slider1 = new PSlider (5, 480, 150, 15, "squishiness= ", -10.0, 20.0);
  slider1.initPos(18.0);
  for (int i=0; i<2; i++) {
    {
      anchors[i] = new Handle( anpts[i][0], anpts[i][1], 10, color(0,255,200), "Square" );
      curvs[i] = new Handle( cvpts[i][0], cvpts[i][1], 10, color(0,255,200), "Square" );                                                                           
    }
  }
  myFont = loadFont("Verdana-Bold-12.vlw");
  textFont(myFont);
  ellipseMode( CORNER );
  framerate(30);
}

void draw() {
  squishy = slider1.slv;
  curveTightness(squishy);
  background(bkColor);
  fill(0);
  rect(0,0,600,400);
  fill(50);
  text("Created by Koo-Chul Lee (Nov./10/'05))", 330,15);      
  text("I hear, I forget; I see, I remember; I do, I understand. - A Chinese proverb", 30,395);      
  slider1.display();
  for (int i=0; i<2; i++) 
  {
    anchors[i].display(); 
    curvs[i].display();
  }
  fill(255);
  for (int i=0; i<2; i++) 
  { 
    string =  ad[i] + " ("+nf(anpts[i][0], 3,0)+",  "+nf(anpts[i][1], 3,0) + ")";
    text(string, anpts[i][0]-20, anpts[i][1]-8);
    string = bc[i] + " ("+nf(cvpts[i][0], 3,0)+",  "+nf(cvpts[i][1], 3,0) + ")";
    text(string, cvpts[i][0]-20, cvpts[i][1]-8);
  }
  updatePos();
  stroke(255,255,255);
  curve (anpts[0][0],anpts[0][1],cvpts[0][0],cvpts[0][1], cvpts[1][0],cvpts[1][1],anpts[1][0],anpts[1][1]);
  stroke(255, 100, 100);
  curve (anpts[1][0],anpts[1][1], anpts[0][0],anpts[0][1],cvpts[0][0],cvpts[0][1], cvpts[1][0],cvpts[1][1]);
  stroke(100, 255, 100);
  curve (cvpts[1][0],cvpts[1][1],anpts[1][0],anpts[1][1],anpts[0][0],anpts[0][1],cvpts[0][0],cvpts[0][1]);
  stroke(100, 100, 255);
  curve (cvpts[0][0],cvpts[0][1], cvpts[1][0],cvpts[1][1],anpts[1][0],anpts[1][1],anpts[0][0],anpts[0][1]);
  fill(0);
  text("curveTightness( " + nfs(slider1.slv, 1,2) + " );",  10, 420); 
  text("stroke(255, 255, 255); curve( a, b, c, d); stroke(255, 100, 100); curve( d, a, b, c); " ,  10, 440);
  text("stroke(100, 255, 100); curve( c, d, a, b); stroke(100, 100, 255); curve( b, c, d, a); " ,  10, 460);
 stroke(0);
}

void updatePos() {
  for (int i=0; i<2; i++) {
    anpts[i][0] = anchors[i].x + anchors[i].w/2;
    anpts[i][1] = anchors[i].y + anchors[i].w/2;
    cvpts[i][0] = curvs[i].x + curvs[i].w/2;
    cvpts[i][1] = curvs[i].y + curvs[i].w/2;
  }
}



void mousePressed()
{  
  slider1.dragThumb();
  if(slider1.over()) slider1.changeValue();
  for (int i=0; i<2; i++) {
    anchors[i].drag(); 
    curvs[i].drag();
  }
}


void mouseReleased() {
  slider1.dragThumb();
  if(slider1.over()) slider1.changeValue();
  for (int i=0; i<2; i++) {
    anchors[i].drag(); 
    curvs[i].drag();
  }
}