Dragging In Libgdx On Spritebatch

I am making a game where I have to drag objects of a Screen. I am making Screen objects using SpriteBatch.draw(....) method where I am using rotation so using only one Texture Regi

Solution 1:

package com.dance.utils;

import com.badlogic.gdx.input.GestureDetector;
import com.badlogic.gdx.input.GestureDetector.GestureListener;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.math.Vector3;
import com.dance.screen.GameScreen;


publicclassGameTouchProcessor 
{
private GameScreen gameScreen;
Vector3 touchPoint=newVector3();
Vector3 relativeTouchPoint=newVector3();

Vector2lastPosition=newVector2();

GestureListener listner=newGestureListener() 
{

    @Overridepublicbooleanzoom(float arg0, float arg1) {
        // TODO Auto-generated method stubreturnfalse;
    }


    @Overridepublicbooleanfling(float arg0, float arg1, int arg2) {
        // TODO Auto-generated method stubreturnfalse;
    }

    @OverridepublicbooleanlongPress(float arg0, float arg1) {
        // TODO Auto-generated method stubreturnfalse;
    }

    @Overridepublicbooleanpan(float arg0, float arg1, float arg2, float arg3) {
        if(gameScreen.isPlayerDraged)
        {
        gameScreen.cam.unproject(relativeTouchPoint.set(arg0, arg1, 0));
        GameScreen.position.set(lastPosition.x + relativeTouchPoint.x - touchPoint.x, lastPosition.y + relativeTouchPoint.y - touchPoint.y);
        }
        returnfalse;
    }

    @OverridepublicbooleanpanStop(float arg0, float arg1, int arg2, int arg3) {
        // TODO Auto-generated method stubreturnfalse;
    }

    @Overridepublicbooleantap(float arg0, float arg1, int arg2, int arg3) {
        // TODO Auto-generated method stubreturnfalse;
    }

    @OverridepublicbooleantouchDown(float arg0, float arg1, int arg2, int arg3) {
        gameScreen.cam.unproject(touchPoint.set(arg0, arg1, 0));
        lastPosition.set(GameScreen.position); //HERE POSITION IS A VECTOR2 I AM DRAWING MY OBJECT ON THIS POSITION SO WHEN POSITION IS CHANGED OBJECT MOVESreturnfalse;
    }


    @Overridepublicbooleanpinch(Vector2 arg0, Vector2 arg1, Vector2 arg2,
            Vector2 arg3) {
        // TODO Auto-generated method stubreturnfalse;
    }
};

public GestureDetector  detector=newGestureDetector(listner)
{

    publicbooleantouchUp(int arg0, int arg1, int arg2, int arg3)
    {
        gameScreen.isPlayerDraged=false;
        returnfalse;
    }
};


publicGameTouchProcessor(GameScreen gameScreen) 
{
    this.gameScreen=gameScreen;
}

}

IN YOUR GAME SCREEN (or whichever screen u want to drag)PUT THIS

    inputMultiplexer=newInputMultiplexer();
    inputMultiplexer.addProcessor(game);
    inputMultiplexer.addProcessor(newGameTouchProcessor(this).detector);
    Gdx.input.setInputProcessor(inputMultiplexer);

Dont get confused with snippets of my code

in gamescreen i am drawing my object on postion of a vector2 and i am modifing the vector2 in PAN method

for a better info on input processor

input processor

actually all the input in Libgdx is running on a seperate thread and a input processor is assigned to it. But when you want to make your own proceesor like in your case u wanted a pan callback to drag object.

So if you add your proccesor than Gdx default proceesor wont work and you will not get many of the important input call back so you will have to handle them explicitly.

So to avoid that we create a multiplexor and add both the input proceesor and your custom to it so it works with all the call backs

here my game class is implementing the inputproceesor (default one). i have merged the default input processor with my custom one