int width = 800;
int height = 600;

int button1X;
int button1Y;
int button1Width = width/20;
int button1Height = height/20;
int button2X;
int button2Y;
int button2Width = button1Width;
int button2Height = button1Height;
float buttonFont = button1Height/1.5;
float wordFont = button1Height;

int angle = 0;



color buttonColor, buttonHighlight, buttonPressed;

PFont font;

boolean button1Over = false;
boolean button2Over = false;

void setup() {
  
  size(width,height);
  smooth();
  font = loadFont("CourierNew36.vlw"); 
  buttonColor = color(255);
  buttonHighlight = color(200);
  buttonPressed = color(50);
  button1X = width/10 - button1Width/2;
  button1Y = height/5 - button1Height/2;
  button2X = 2*width/10 - button1Width/2;
  button2Y = height/5 - button1Height/2;
  
}

void draw() {
  
  update(mouseX,mouseY);
  background(0);
  
  if(button1Over) {
    fill(buttonHighlight);
  } else {
    fill(buttonColor);
  }
  stroke(0);
  rect(button1X,button1Y, button1Width, button1Height);
  
  if(button2Over) {
    fill(buttonHighlight);
  } else {
    fill(buttonColor);
  }
  stroke(0);
  rect(button2X,button2Y, button2Width, button2Height);
  
  textFont(font, buttonFont);
  fill(0);
  text("-1",button1X + button1Width/3.9,button1Y + button1Height/1.3);
  text("+1",button2X + button1Width/3.9,button1Y + button1Height/1.3);
  
  textFont(font, wordFont);
  fill(255);
  text("Inner Angle: " + angle,button2X + button1Width + width/20,button1Y + button1Height/1.2);
  
}

///////////////////////////////////

void update(int x, int y) {
  
  if(overButton(button1X,button1Y,button1Width,button1Height)){
    button1Over = true;
  } else {
    button1Over = false;
  }
  if(overButton(button2X,button2Y,button2Width,button2Height)){
    button2Over = true;
  } else {
    button2Over = false;
  }
  
}

void mousePressed() {
  
  if(button1Over) {
    println("Button1 pressed");
    angle = angle - 1;
    fill(buttonPressed);
    rect(button1X,button1Y, button1Width, button1Height);
  }
  if(button2Over) {
    println("Button2 pressed");
    angle = angle + 1;
    fill(buttonPressed);
    rect(button2X,button2Y, button2Width, button2Height);
  }
  
}

boolean overButton(int x, int y, int width, int height) {
  
  if(mouseX >= x && mouseX <= x+width && mouseY >= y && mouseY <= y+height) {
    return true;
  } else {
    return false;
  }
  
}