class OrientedCursor{
 
    constructor(elementID){
      
      this.elementID = elementID;
      this.tiltX = 0;
      this.tiltY = 0;
      this.pressure = 0;
      this.diameter = 0;
      
      this.targetAngle = 0;
      
      this.isOnCanvas = false;
    }
    
    // -----------------------------------------
    // -----------------------------------------
    
    
    catchCursor(){
      let getCanvas = document.getElementById(this.elementID);
      
      getCanvas.addEventListener("pointermove", (e) => {
        //console.log("pointerMove");
    
        if (this.isOnCanvas) {
          this.tiltX = e.tiltX;
          this.tiltY = e.tiltY;
          this.pressure = e.pressure;
        
          //console.log(inclinationX + ' ' + inclinationY + ' ' + pressure);
        }
      }, false);
  
      getCanvas.addEventListener("pointerdown", (e) => {
        //console.log("pointerDown");
        getCanvas.setPointerCapture(e.pointerId);
        this.isOnCanvas = true;
    
        this.tiltX = e.tiltX;
        this.tiltY = e.tiltY;
        this.pressure = e.pressure;
      
      }, false);
  
      getCanvas.addEventListener("pointerup", (e) => {
        //console.log("pointerUp");
      
        if (this.isOnCanvas) {
          getCanvas.releasePointerCapture(e.pointerId);
          this.isOnCanvas = false;
      
          this.tiltX = e.tiltX;
          this.tiltY = e.tiltY;
          this.pressure = e.pressure;
      
          //console.log(inclinationX + ' ' + inclinationY + ' ' + pressure);
        
        }
      }, false);
    }
    
    
    // -----------------------------------------
    // -----------------------------------------
    
    
    calculateAngle(){
      this.targetAngle = atan2(this.tiltY, this.tiltX);
    }
    
    
    // -----------------------------------------
    // -----------------------------------------
    
    
    showData(){
    // LIVE COORDINATES
    push();
      noFill();
      stroke('#fff')
      text('pressure: ' + this.pressure, 10, 30);
      text('tilt_X: ' + this.tiltX, 10, 50);
      text('tilt_Y: ' + this.tiltY, 10, 70);
      text('angle arctan: ' + this.targetAngle, 10, 90);
    pop();
    }
    
    // -----------------------------------------
    // -----------------------------------------
    
    
    mapPressure(){
      this.diameter = map(this.pressure, 0, 1, 1, 3);
    }
    
    // -----------------------------------------
    // -----------------------------------------
    
    
    process_rotate(){
      translate(mouseX, mouseY); //mouseX & mouseY
      rotate(this.targetAngle);
      translate(-mouseX, -mouseY); // -mouseX & -mouseY
    }
    
    // -----------------------------------------
    // -----------------------------------------
    
    
    showCursor(mouseX, mouseY){
      // POINTER CENTER   
      push();
        noStroke();
        fill(0, 0, 0);
        circle(mouseX, mouseY, 20);
      pop();
      
      // RECTANGLE SHAPE
      push();
        this.process_rotate()
  
        noFill();
        stroke(2)
        rectMode(CENTER)
        rect(mouseX, mouseY, this.diameter, 30); // reacts to pen pressure value
      
        noStroke();
        fill('yellow');
        circle(mouseX, mouseY, 10); // shows the pivot point 
      pop();
     
      // POINTS FROM STYLUS AT GOOD INCLINATION & PRESSURE VALUE
      push();
        this.process_rotate();
        noFill();
        stroke(1);
        ellipseMode(CENTER);
        circle(mouseX, mouseY + this.diameter, 10); // LEFT  || WEST
        circle(mouseX + this.diameter, mouseY, 10);// DOWN  || SOUTH
        circle(mouseX, mouseY - this.diameter, 10); // RIGHT || EAST
        circle(mouseX - this.diameter, mouseY, 10); // UP    || NORTH
      
      
      pop();
    
      circle(mouseX + this.diameter/4 * cos(this.targetAngle), mouseY + this.diameter/4 * sin(this.targetAngle), 1)
      circle(mouseX + this.diameter/4 * cos(this.targetAngle + PI), mouseY + this.diameter/4 * sin(this.targetAngle+ PI), 1)
    
   
    // TILT AXIS & LENGTH
    push();
      fill('red');
      circle(mouseX + this.tiltX, mouseY + this.tiltY, 10);
    
    pop();
    
    push();
      fill('blue'); 
      circle(mouseX - this.tiltX, mouseY - this.tiltY, 10);
    pop();
    }
    
  }