io.lonelyrobot.empires.client.core.R2CameraController.java Source code

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Here is the source code for io.lonelyrobot.empires.client.core.R2CameraController.java

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/* #########################################################################
 * Copyright (c) 2014 RANDOM ROBOT SOFTWORKS
 * (See @authors file)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *        http://www.apache.org/licenses/LICENSE-2.0
 * 
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ######################################################################### */
package io.lonelyrobot.empires.client.core;

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

/**
 * Basic camera controller to attach to any camera to implement scrolling and zooming. Functionality can be triggered
 * with enums
 * 
 * @author: Katharina Sabel <katharina.sabel@2rsoftworks.de>
 */
public class R2CameraController extends InputAdapter {
    private boolean allowZoom = false;
    private final OrthographicCamera camera;
    private final Vector3 curr = new Vector3();
    private final Vector3 last = new Vector3(-1, -1, -1);
    private final Vector3 delta = new Vector3();
    private float sclx, scly;

    public R2CameraController(boolean allowZoom) {
        this(allowZoom, null);
    }

    @Override
    public boolean touchDown(int x, int y, int pointer, int button) {
        Vector3 tmp = new Vector3(x * sclx, y * scly, 0);
        camera.unproject(tmp);
        return false;
    }

    public R2CameraController(boolean allowZoom, OrthographicCamera camera) {
        setCameraScaling(1f, 1f);
        this.camera = camera;
        this.allowZoom = allowZoom;
    }

    /** Inject the size of the Camera Viewport if the viewport isn't by default == screen port */
    public void setCameraScaling(float x, float y) {
        this.sclx = (float) Gdx.graphics.getWidth() / x;
        this.scly = (float) Gdx.graphics.getHeight() / y;
    }

    @Override
    public boolean touchUp(int x, int y, int pointer, int button) {
        last.set(-1, -1, -1);
        return false;
    }

    @Override
    public boolean touchDragged(int x, int y, int pointer) {
        curr.set(x, y, 0);
        if (!(last.x == -1 && last.y == -1 && last.z == -1)) {
            delta.set(last.x, last.y, 0);
            delta.sub(curr);
            delta.scl(camera.zoom);
            camera.position.add(delta.x, -delta.y, 0);
        }
        last.set(x, y, 0);

        return false;
    }

    @Override
    public boolean scrolled(int amount) {
        if (allowZoom) {
            float newZoom = camera.zoom * (1 + (amount < 0 ? 0.05f : -0.05f));
            changeZoom(newZoom, last.x, last.y);
            return true;
        } else
            return false;

    }

    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);
    }

}