Android Open Source - multidraw Drawing Panel

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License

The source code is released under:

This source code is available under the following license: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Full listing here: http://creativecommons.org/licenses/by-nc-nd/...

Java Source Code

package cz.halt.multidraw.app;
//from ww w.ja v a2s. com
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by Filip on 21. 4. 2014.
 */
public class DrawingPanel extends View
{
  private Bitmap bitmap;
  private Paint p = new Paint();
  private Rect r = new Rect();

  public DrawingPanel(Context context)
  {
    super(context);
  }

  public DrawingPanel(Context context, AttributeSet attrs)
  {
    super(context, attrs);
  }

  public DrawingPanel(Context context, AttributeSet attrs, int defStyleAttr)
  {
    super(context, attrs, defStyleAttr);
  }

  private int pow2(int a)
  {
    if(a <= 0)
    {
      return 1;
    }
    return pow2(a - 1) * 2;
  }

  private int getNextComplementSize(Canvas c)
  {
    int max = Math.max(c.getWidth(), c.getHeight());
    int log = (int) Math.ceil(Math.log((double) max) / Math.log(2.0) - 0.1);

    return pow2(log);
  }

  @Override
  protected void onDraw(Canvas canvas)
  {
    if(bitmap == null)
    {
      int size = getNextComplementSize(canvas);
      bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
      r.top = 0;
      r.left = 0;
      r.right = canvas.getWidth();
      r.bottom = canvas.getHeight();
    }
    ExampleDrawer.drawBitmap(bitmap, canvas.getWidth(), canvas.getHeight());
    canvas.drawBitmap(bitmap, r, r, p);
  }
}

Java Source Code List

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