Android Open Source - DivisionByZero Zoom Control

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From Project

Back to project page DivisionByZero.

License

The source code is released under:

Apache License

Java Source Code

package com.ggstudios.divisionbyzero;
/*from ww w  .  j  a v  a 2 s  . co m*/
import com.ggstudios.divisionbyzero.Button.OnClickListener;

public class ZoomControl extends Drawable implements Clickable {

  private static final float ZOOM_INCREMENT = 0.25f;

  private Button btnZoomIn, btnZoomOut;

  public ZoomControl() {}

  private static class ZoomAnimation implements Updatable{

    private static final float DURATION = 0.3f;
    private float delta;
    private float time;
    private float base;

    private boolean finished = true;

    public void setDeltaZoom(float delta) {
      if(finished) {
        this.delta = delta;
        base = Core.zoom;
        time = 0;
        finished = false;
      } else {
        this.delta += delta;
        base = Core.zoom;
        time = 0;
      }
    }

    @Override
    public boolean update(float dt) {
      boolean result;
      
      float oldZoom = Core.zoom;
      
      time += dt;
      if(time < DURATION) {
        float newZoom;
        float t =  time / (DURATION /2f);
        if (t < 1) {
          newZoom = delta/2*t*t + base;
        } else {
          t--;
          newZoom = -delta/2 * (t*(t-2) - 1) + base;
        }
        
        result = Core.game.setZoom(newZoom);
      } else {
        Core.game.setZoom(base + delta);
        result = false;
      }
      
      if(!result) {
        finished = true;
      } else {
        float a_x = (0.5f) * ((Core.canvasWidth  / Core.zoom) - (Core.canvasWidth  / oldZoom));
        float a_y = (0.5f) * ((Core.canvasHeight  / Core.zoom) - (Core.canvasHeight / oldZoom));
        Core.offX += a_x;
        Core.offY += a_y;
        
        Core.game.onScrolled();
      }
      
      return result;
    }

  }

  private ZoomAnimation zoomAnimation = new ZoomAnimation();

  public void build() {
    btnZoomIn = new Button(Core.canvasWidth - Core.SDP * 1.5f, Core.SDP_H, Core.SDP, Core.SDP, R.drawable.zoom_control_in);
    btnZoomOut = new Button(Core.canvasWidth - Core.SDP * 1.5f, Core.SDP * 1.5f, Core.SDP, Core.SDP, R.drawable.zoom_control_out);

    btnZoomIn.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(Button sender) {
        zoomAnimation.setDeltaZoom(ZOOM_INCREMENT);
        if(!Core.gu.hasUiUpdatable(zoomAnimation)) {
          Core.gu.addUiUpdatable(zoomAnimation);
        }
      }

    });

    btnZoomOut.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(Button sender) {
        zoomAnimation.setDeltaZoom(-ZOOM_INCREMENT);
        if(!Core.gu.hasUiUpdatable(zoomAnimation)) {
          Core.gu.addUiUpdatable(zoomAnimation);
        }
      }

    });
  }

  @Override
  public void draw(float offX, float offY) {
    btnZoomIn.draw(0, 0);
    btnZoomOut.draw(0, 0);
  }

  @Override
  public void refresh() {
    btnZoomIn.refresh();
    btnZoomOut.refresh();
  }

  @Override
  public boolean onTouchEvent(int action, float x, float y) {
    return btnZoomIn.onTouchEvent(action, x, y) || btnZoomOut.onTouchEvent(action, x, y);  
  }

}

Java Source Code List

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