de.r2soft.r2physics.tests.CameraController.java Source code

Introduction

Here is the source code for de.r2soft.r2physics.tests.CameraController.java

Source

/* #########################################################################
 * Copyright (c) 2014 Random Robot Softworks
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 ######################################################################### */

package de.r2soft.r2physics.tests;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.InputAdapter;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.math.Vector3;

public class CameraController extends InputAdapter {
    final OrthographicCamera camera;
    private InputHandler other;
    final Vector3 curr = new Vector3();
    final Vector3 last = new Vector3(-1, -1, -1);
    final Vector3 delta = new Vector3();

    public CameraController(OrthographicCamera camera, InputHandler other) {
        this.camera = camera;
        this.other = other;
    }

    @Override
    public boolean touchDown(int screenX, int screenY, int pointer, int button) {

        if (other.isDragged())
            return true;

        float sclx = (float) Gdx.graphics.getWidth();
        float scly = (float) Gdx.graphics.getHeight();

        Vector3 tmp = new Vector3(screenX * sclx, screenY * scly, 0);
        camera.unproject(tmp);

        return false;
    }

    @Override
    public boolean touchDragged(int x, int y, int pointer) {
        if (other.isDragged())
            return true;

        curr.set(x, y, 0);
        if (!(last.x == -1 && last.y == -1 && last.z == -1)) {
            delta.set(last.x, last.y, 0);
            delta.scl(camera.zoom);
            delta.sub(curr);
            camera.position.add(delta.x, delta.y, 0);
        }
        last.set(x, y, 0);
        return false;
    }

    @Override
    public boolean touchUp(int x, int y, int pointer, int button) {
        if (other.isDragged())
            return true;

        last.set(-1, -1, -1);

        return false;
    }

    @Override
    public boolean scrolled(int amount) {
        float newZoom = camera.zoom * (1 + (amount < 0 ? 0.1f : -0.1f));
        changeZoom(newZoom, last.x, last.y);
        return true;
    }

    public void changeZoom(float zoom, float x, float y) {

        Vector3 before = new Vector3(x, y, 0);
        camera.unproject(before);

        camera.zoom = zoom;
        camera.update();
        Vector3 after = new Vector3(x, y, 0);
        camera.unproject(after);

        camera.translate(before.x - after.x, before.y - after.y, 0);
    }

}