Processing controlP5 round button

gistfile1.java

import controlP5.*;


ControlPad cp;
ControlP5 controlP5;

void setup() {
  size(400, 400);
  frameRate(30);
  smooth();
  controlP5 = new ControlP5(this);

  cp = new ControlPad(controlP5, "DIY", 60, 40, 100, 200);

  controlP5.register(cp);
}

void draw() {
  background(0);
}

void controlEvent(ControlEvent theEvent) {
  println(theEvent.arrayValue());
}


class ControlPad extends Controller {
  ControlPad(ControlP5 theControlP5, String theName, int theX, int theY, int theWidth, int theHeight) {
    super(theControlP5, (Tab)(theControlP5.getTab("default")), theName, theX, theY, theWidth, theHeight);
  }


  public void updateInternalEvents(PApplet theApplet) {
    // get your actions here
  }
  
  protected boolean inside() {
    float centerX = position.x+width/2;
    float centerY = position.y+height/2;
    float majorRadius, minorRadius, focalDistance, fp1x, fp1y, fp2x, fp2y;
    if (width>height) {
      majorRadius=width/2;
      minorRadius=height/2;
      focalDistance=sqrt(pow(majorRadius, 2)-pow(minorRadius, 2));
      fp1x=centerX-focalDistance;
      fp2x=centerX+focalDistance;
      fp1y=centerY;
      fp2y=centerY;
    }
    else {
      majorRadius=height/2;
      minorRadius=width/2;
      focalDistance=sqrt(pow(majorRadius, 2)-pow(minorRadius, 2));
      fp1y=centerY-focalDistance;
      fp2y=centerY+focalDistance;
      fp1x=centerX;
      fp2x=centerX;
    }
    float fp1Distance=dist(fp1x, fp1y, mouseX, mouseY);
    float fp2Distance=dist(fp2x, fp2y, mouseX, mouseY);

    return (fp1Distance+fp2Distance<2*majorRadius);
  }

  // overwrite the draw method for the controller's visual representation.
  public void draw(PApplet theApplet) {
    // use pushMatrix and popMatrix when drawing
    // the controller.
    theApplet.pushMatrix();
    theApplet.translate(position().x(), position().y());
    // draw the background of the controller.
    if (getIsInside()) {
      theApplet.fill(150);
    } 
    else {
      theApplet.fill(100);
    }
    ellipse(0, 0, width, height);

    theApplet.popMatrix();
 } 
 void setValue(float v){}

  public void addToXMLElement(ControlP5XMLElement theElement) {
  }
}

void drawCrossAir(float x, float y) {
  stroke(255, 0, 0);
  line(x-5, y-5, x+5, y+5);
  line(x-5, y+5, x+5, y-5);
}