Merge branch 'top-secret' into 'master'

package com.example.game2d;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

public class Joystick {

    private int outerCircleRadius;

    private int innerCircleRadius;

    private int outerCircleCenterPositionX;

    private int outerCircleCenterPositionY;

    private int innerCircleCenterPositionX;

    private int innerCircleCenterPositionY;

    private Paint innerCirclePaint;

    private Paint outerCirclePaint;

    private double joystickCenterToTouchDistance;

    private boolean isPressed;

    private double actuatorX;

    private double actuatorY;

    public Joystick(int centerPositionX, int centerPositionY, int outerCircleRadius, int innerCircleRadius) {

        // Outer and inner circle make up the joystick

        outerCircleCenterPositionX = centerPositionX;

        outerCircleCenterPositionY = centerPositionY;

        innerCircleCenterPositionX = centerPositionX;

        innerCircleCenterPositionY = centerPositionY;

        // Radii of circles

        this.outerCircleRadius = outerCircleRadius;

        this.innerCircleRadius = innerCircleRadius;

        // Paint of circles

        outerCirclePaint = new Paint();

        outerCirclePaint.setColor(Color.GRAY);

        outerCirclePaint.setStyle(Paint.Style.FILL_AND_STROKE);

        innerCirclePaint = new Paint();

        innerCirclePaint.setColor(Color.BLUE);

        innerCirclePaint.setStyle(Paint.Style.FILL_AND_STROKE);

    }

    public void draw(Canvas canvas) {

        // Draw outer circle

        canvas.drawCircle(

                outerCircleCenterPositionX,

                outerCircleCenterPositionY,

                outerCircleRadius,

                outerCirclePaint

        );

        // Draw inner circle

        canvas.drawCircle(

                innerCircleCenterPositionX,

                innerCircleCenterPositionY,

                innerCircleRadius,

                innerCirclePaint

        );

    }

    public void update() {

        updateInnerCirclePosition();

    }

    private void updateInnerCirclePosition() {

        innerCircleCenterPositionX = (int) (outerCircleCenterPositionX + actuatorX*outerCircleRadius);

        innerCircleCenterPositionY = (int) (outerCircleCenterPositionY + actuatorY*outerCircleRadius);

    }

    public boolean isPressed(double touchPositionX, double touchPositionY) {

        // pythagorean theorem lol

        joystickCenterToTouchDistance = Math.sqrt(

                Math.pow(outerCircleCenterPositionX - touchPositionX, 2) +

                Math.pow(outerCircleCenterPositionY - touchPositionY, 2)

        );

        return joystickCenterToTouchDistance < outerCircleRadius;

    }

    public void setIsPressed(boolean isPressed) {

        this.isPressed = isPressed;

    }

    public boolean getIsPressed() {

        return isPressed;

    }

    public void setActuator(double touchPositionX, double touchPositionY) {

        // distances from center of joystick to touch position

        double deltaX = touchPositionX - outerCircleCenterPositionX;

        double deltaY = touchPositionY - outerCircleCenterPositionY;

        // pythagorean theorem again lol (abstract away later)

        double deltaDistance = Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));

        // actuator value is percentage in range 0-1 where 1 is furthest

        if(deltaDistance < outerCircleRadius) {

            actuatorX = deltaX / outerCircleRadius;

            actuatorY = deltaY / outerCircleRadius;

        } else {

            // I don't really know why this has to be this way ("vector normalization")

            actuatorX = deltaX / deltaDistance;

            actuatorY = deltaY / deltaDistance;

        }

    }

    public void resetActuator() {

        actuatorX = 0.0;

        actuatorY = 0.0;

    }

    public double getActuatorX() {

        return actuatorX;

    }

    public double getActuatorY() {

        return actuatorY;

    }

}