PImage a; 

int buttonCount = 5;
TextButtons[] button = new TextButtons[buttonCount];

boolean clickAction;

PFont font;

void setup() {
  size(600, 600);
  stroke(255);
  frameRate(30);
  smooth();
  a = loadImage("triangle2.jpg");

  font = loadFont("UniversLTStd-Light-48.vlw");
  //font = loadFont("ScalaSans-Caps-32.vlw");
  
  button[0] = new TextButtons(100, 100, 150,50, "Resume", font, 30, "http://www.williamslabs.com/docs/PhelpsWilliamsResume2008.pdf", false);
  //button[1] = new TextButtons(400, 100, 150,150, "Contact", font, 30, "http://www.williamslabs.com/me.html");
  button[1] = new TextButtons(40, 360, 150,50, "Projects", font, 30, "http://www.williamslabs.com/projects/", false);
  button[2] = new TextButtons(420, 360, 150,150, "Molecubes", font, 30, "http://molecubes.org/", false);
  //button[4] = new TextButtons(100, 500, 150,50, "KepCalc", font, 30, "http://sourceforge.net/projects/kepcalc");
  button[3] = new TextButtons(240, 520, 150,150, "Pictures", font, 30, "http://picasaweb.google.com/phelpsw", false);
  button[4] = new TextButtons(370, 100, 150,150, "Pubs/Docs", font, 30, "http://www.williamslabs.com/docs/", false);
}

float angle;
float x;
float y;

float xe;
float ye;
float targetX, targetY;
float easing = 0.02;


void draw() {
  background(255);
 
 for(int i = 0; i<buttonCount; i++)
 {
  button[i].update();
  button[i].display();
 }clickAction = false;

  // ease angle
  targetX = mouseX;
  float dx = mouseX - xe;
  if(abs(dx) > 1) {
    xe += dx * easing;
  }
  
  targetY = mouseY;
  float dy = mouseY - ye;
  if(abs(dy) > 1) {
    ye += dy * easing;
  }
    
  x = xe - width/2;
  y = ye - height/2;
  angle = calcRadians(x, y);

  /*
  float textx = 50;
  float texty = 50;
  float textang = calcRadians(textx - width/2, texty - height/2);
  float fade = (float)Math.min(Math.abs(textang - angle), Math.abs(textang - (angle + 2*Math.PI)));
  fade = 1 - fade / (float)(Math.PI);
  
  textFont(font);
  fill(0, 0, 0, sq(fade)* 75 + 25);
  text("werd", textx,texty);
  */
  
  translate(width/2, height/2);
  scale(0.5);
  rotate(angle);
  pushMatrix(); 
  translate(-a.width/2, -a.height/2);
  image(a, 0, 0);
  popMatrix(); 

}


float calcRadians(float x, float y)
{
  float angle;
  if(x>=0){
    angle = (float)Math.atan(y/x) + (float)Math.PI/2;
  } else {
    angle = (float)Math.atan(y/x) + (float)(3*Math.PI/2);
  } return angle;
}

void mouseReleased() {
  clickAction = true; 
}


class Button
{
  int x, y;
  int w, h;
  boolean over = false;
  boolean pressed = false;   
  
  void pressed() {
    if(over && clickAction==true) {
      pressed = true;
    } else {
      pressed = false;
    }    
  }
  
  boolean overRect(int x, int y, int width, int height) {
  if (mouseX >= x && mouseX <= x+width && 
      mouseY >= y && mouseY <= y+height) {
    return true;
  } else {
    return false;
  }
}
}


class TextButtons extends Button 
{
  String txt;
  String uri;
  int txtsize;
  
  // used for fade calculation
  float textang;
  float fade;
  boolean newpage;
  TextButtons(int ix, int iy, int wd, int ht, String textin, PFont font, int itxtsize, String addr, boolean newp) 
  {
    x = ix;
    y = iy;
    w = wd;
    h = ht;
    txt = textin;
    uri = addr;
    txtsize = itxtsize;
    newpage = newp;
  }
  
  void update() 
  {
    over();
    pressed();
    if(pressed) {
      if(newpage) {
        link(uri, "_new");
      } else {
        link(uri);
      }
    //} else if (over){
      // make text glow or something
    //} else {
      // who cares!
    }
  }
  
  void over() 
  {
    if( overRect(x, y, w, h) ) {
      over = true;
    } else {
      over = false;
    }
  }
  
  void display() 
  {
    textang = calcRadians(x - width/2, y - height/2);
    fade = (float)Math.min(Math.abs(textang - angle), Math.abs(textang - (angle + 2*Math.PI)));
    fade = 1 - fade / (float)(PI);
    
    textFont(font,txtsize);
    fill(0, 0, 0, sq(fade)*170+85);
    text(txt, x,y,w,h);
  }
}