Android Open Source - slider Piece Drawer Factory

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License

The source code is released under:

Apache License

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Java Source Code

package de.devisnik.android.sliding.tile;
/*w w w.  j  av a2  s. c  om*/
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Bitmap.Config;
import de.devisnik.android.sliding.Settings;
import de.devisnik.sliding.Point;

public class PieceDrawerFactory {

  private final int itsWidth;
  private final int itsHeight;
  private final Settings itsSettings;
  private final Point itsPieceSize;

  PieceDrawerFactory(final int width, final int height, final Settings settings) {
    itsWidth = width;
    itsHeight = height;
    itsSettings = settings;
    itsPieceSize = Point.divide(width, height, settings.getFrameSize(width, height));
  }

  public IPieceDrawer create() {
    if (itsSettings.isUseDefaultImage())
      return createCachedNumberDrawer();
    Bitmap storedImage = itsSettings.readImage();
    if (storedImage == null)
      return createCachedNumberDrawer();
    return new ImagePieceDrawer(createTargetBitmap(storedImage), itsPieceSize);
  }

  private Bitmap createTargetBitmap(final Bitmap bitmap) {
    if (bitmap == null)
      return null;
    Config bitmapConfig = bitmap.getConfig();
    Bitmap output = Bitmap.createBitmap(itsWidth, itsHeight, bitmapConfig == null ? Config.ARGB_8888
        : Config.ARGB_8888);
    Canvas canvas = new Canvas(output);
    Paint paint = new Paint();
    Rect clipRect = computeClipRectangle(bitmap);
    Rect targetRect = new Rect(0, 0, itsWidth, itsHeight);
    paint.setAntiAlias(true);
    canvas.drawBitmap(bitmap, clipRect, targetRect, paint);
    return output;
  }

  private Rect computeClipRectangle(final Bitmap bitmap) {
    float targetRatio = ((float) itsWidth) / itsHeight;
    Point bitmapArea = new Point(bitmap.getWidth(), bitmap.getHeight());
    float bitmapRatio = bitmapArea.ratio();
    Point clipArea = bitmapArea.copy();
    if (targetRatio <= bitmapRatio)
      clipArea.x = Math.round(targetRatio * clipArea.y);
    else
      clipArea.y = Math.round(clipArea.x / targetRatio);
    Point shift = Point.diff(bitmapArea, clipArea).divideBy(2);
    return new Rect(shift.x, shift.y, clipArea.x + shift.x, clipArea.y + shift.y);
  }

  private IPieceDrawer createCachedNumberDrawer() {
    return new BitmapCachingPieceDrawer(new NumberPieceDrawer(itsPieceSize));
  }

}

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