aurelienribon.texturepackergui.PanZoomInputProcessor.java Source code

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Here is the source code for aurelienribon.texturepackergui.PanZoomInputProcessor.java

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/*******************************************************************************
 * Copyright 2011 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 aurelienribon.texturepackergui;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input.Buttons;
import com.badlogic.gdx.InputAdapter;
import com.badlogic.gdx.math.Vector2;

/**
 * @author Aurelien Ribon | http://www.aurelienribon.com/
 */
public class PanZoomInputProcessor extends InputAdapter {
    private final Canvas canvas;
    private final Vector2 lastTouch = new Vector2();
    private final int[] zoomLevels = { 5, 10, 16, 25, 33, 50, 66, 100, 150, 200, 300, 400, 600, 800, 1000 };
    private int zoomLevel = 100;

    public PanZoomInputProcessor(Canvas canvas) {
        this.canvas = canvas;
    }

    @Override
    public boolean touchDown(int x, int y, int pointer, int button) {
        Vector2 p = canvas.screenToWorld(x, y);
        lastTouch.set(p);
        return false;
    }

    @Override
    public boolean touchDragged(int x, int y, int pointer) {
        Vector2 p = canvas.screenToWorld(x, y);
        Vector2 delta = new Vector2(p).sub(lastTouch);
        canvas.getCamera().translate(-delta.x, -delta.y, 0);
        canvas.getCamera().update();
        lastTouch.set(canvas.screenToWorld(x, y));
        return false;
    }

    @Override
    public boolean scrolled(int amount) {
        if (zoomLevel == zoomLevels[0] && amount < 0) {
            zoomLevel = zoomLevels[1];
        } else if (zoomLevel == zoomLevels[zoomLevels.length - 1] && amount > 0) {
            zoomLevel = zoomLevels[zoomLevels.length - 2];
        } else {
            for (int i = 1; i < zoomLevels.length - 1; i++) {
                if (zoomLevels[i] == zoomLevel) {
                    zoomLevel = amount > 0 ? zoomLevels[i - 1] : zoomLevels[i + 1];
                    break;
                }
            }
        }

        canvas.getCamera().zoom = 100f / zoomLevel;
        canvas.getCamera().update();
        return false;
    }
}