Android Open Source - Holo-Minimal-Snake Tile View

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Back to project page Holo-Minimal-Snake.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.kandarp.snake;
/* w w w. j av  a2  s  .  c  o  m*/
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;

public class TileView extends View {

  /**
   * Parameters controlling the size of the tiles and their range within view.
   * Width/Height are in pixels, and Drawables will be scaled to fit to these
   * dimensions. X/Y Tile Counts are the number of tiles that will be drawn.
   */

  protected static int mTileSize = 35;

  protected static int mXTileCount;
  protected static int mYTileCount;

  private static int mXOffset;
  private static int mYOffset;

  /**
   * A hash that maps integer handles specified by the subclasser to the
   * drawable that will be used for that reference
   */
  private Bitmap[] mTileArray;

  /**
   * A two-dimensional array of integers in which the number represents the
   * index of the tile that should be drawn at that locations
   */
  private int[][] mTileGrid;

  private final Paint mPaint = new Paint();

  public TileView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }

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

  public void internalRecalcTileGrid(int w, int h) {
    mXTileCount = (int) Math.floor(w / mTileSize);
    mYTileCount = (int) Math.floor(h / mTileSize);

    mXOffset = ((getWidth() - (mTileSize * mXTileCount)) / 2);
    mYOffset = ((getHeight() - (mTileSize * mYTileCount)) / 2);

    mTileGrid = new int[mXTileCount][mYTileCount];
    clearTiles();
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    internalRecalcTileGrid(w, h);
  }

  public void recalcTileGrid() {
    internalRecalcTileGrid(getWidth(), getHeight());
  }

  /**
   * Rests the internal array of Bitmaps used for drawing tiles, and sets the
   * maximum index of tiles to be inserted
   * 
   * @param tilecount
   */

  public void resetBitmapTiles(int tilecount) {
    mTileArray = new Bitmap[tilecount];
  }

  /**
   * Function to set the specified Drawable as the tile for a particular
   * integer key.
   * 
   * @param key
   * @param tile
   */
  public void loadBitmapTile(int key, Drawable tile) {
    Bitmap bitmap = Bitmap.createBitmap(mTileSize, mTileSize,
        Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    tile.setBounds(0, 0, mTileSize, mTileSize);
    tile.draw(canvas);

    mTileArray[key] = bitmap;
  }

  /**
   * Resets all tiles to 0 (empty)
   * 
   */
  public void clearTiles() {
    for (int x = 0; x < mXTileCount; x++) {
      for (int y = 0; y < mYTileCount; y++) {
        setTile(0, x, y);
      }
    }
  }

  /**
   * Used to indicate that a particular tile (set with loadTile and referenced
   * by an integer) should be drawn at the given x/y coordinates during the
   * next invalidate/draw cycle.
   * 
   * @param tileindex
   * @param x
   * @param y
   */
  public void setTile(int tileindex, int x, int y) {
    mTileGrid[x][y] = tileindex;
  }

  public int getTileIndex(int x, int y) {
    return mTileGrid[x][y];
  }

  @Override
  public void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    for (int x = 0; x < mXTileCount; x += 1) {
      for (int y = 0; y < mYTileCount; y += 1) {
        if (mTileGrid[x][y] > 0) {
          canvas.drawBitmap(mTileArray[mTileGrid[x][y]], mXOffset + x
              * mTileSize, mYOffset + y * mTileSize, mPaint);
        }
      }
    }

  }

}

Java Source Code List

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