1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.snake;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.graphics.Bitmap;
22import android.graphics.Canvas;
23import android.graphics.Paint;
24import android.graphics.drawable.Drawable;
25import android.util.AttributeSet;
26import android.view.View;
27
28/**
29 * TileView: a View-variant designed for handling arrays of "icons" or other drawables.
30 *
31 */
32public class TileView extends View {
33
34    /**
35     * Parameters controlling the size of the tiles and their range within view. Width/Height are in
36     * pixels, and Drawables will be scaled to fit to these dimensions. X/Y Tile Counts are the
37     * number of tiles that will be drawn.
38     */
39
40    protected static int mTileSize;
41
42    protected static int mXTileCount;
43    protected static int mYTileCount;
44
45    private static int mXOffset;
46    private static int mYOffset;
47
48    private final Paint mPaint = new Paint();
49
50    /**
51     * A hash that maps integer handles specified by the subclasser to the drawable that will be
52     * used for that reference
53     */
54    private Bitmap[] mTileArray;
55
56    /**
57     * A two-dimensional array of integers in which the number represents the index of the tile that
58     * should be drawn at that locations
59     */
60    private int[][] mTileGrid;
61
62    public TileView(Context context, AttributeSet attrs) {
63        super(context, attrs);
64
65        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TileView);
66        mTileSize = a.getDimensionPixelSize(R.styleable.TileView_tileSize, 12);
67
68        a.recycle();
69    }
70
71    public TileView(Context context, AttributeSet attrs, int defStyle) {
72        super(context, attrs, defStyle);
73
74        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TileView);
75        mTileSize = a.getDimensionPixelSize(R.styleable.TileView_tileSize, 12);
76
77        a.recycle();
78
79    }
80
81    /**
82     * Resets all tiles to 0 (empty)
83     *
84     */
85    public void clearTiles() {
86        for (int x = 0; x < mXTileCount; x++) {
87            for (int y = 0; y < mYTileCount; y++) {
88                setTile(0, x, y);
89            }
90        }
91    }
92
93    /**
94     * Function to set the specified Drawable as the tile for a particular integer key.
95     *
96     * @param key
97     * @param tile
98     */
99    public void loadTile(int key, Drawable tile) {
100        Bitmap bitmap = Bitmap.createBitmap(mTileSize, mTileSize, Bitmap.Config.ARGB_8888);
101        Canvas canvas = new Canvas(bitmap);
102        tile.setBounds(0, 0, mTileSize, mTileSize);
103        tile.draw(canvas);
104
105        mTileArray[key] = bitmap;
106    }
107
108    @Override
109    public void onDraw(Canvas canvas) {
110        super.onDraw(canvas);
111        for (int x = 0; x < mXTileCount; x += 1) {
112            for (int y = 0; y < mYTileCount; y += 1) {
113                if (mTileGrid[x][y] > 0) {
114                    canvas.drawBitmap(mTileArray[mTileGrid[x][y]], mXOffset + x * mTileSize,
115                            mYOffset + y * mTileSize, mPaint);
116                }
117            }
118        }
119
120    }
121
122    /**
123     * Rests the internal array of Bitmaps used for drawing tiles, and sets the maximum index of
124     * tiles to be inserted
125     *
126     * @param tilecount
127     */
128
129    public void resetTiles(int tilecount) {
130        mTileArray = new Bitmap[tilecount];
131    }
132
133    /**
134     * Used to indicate that a particular tile (set with loadTile and referenced by an integer)
135     * should be drawn at the given x/y coordinates during the next invalidate/draw cycle.
136     *
137     * @param tileindex
138     * @param x
139     * @param y
140     */
141    public void setTile(int tileindex, int x, int y) {
142        mTileGrid[x][y] = tileindex;
143    }
144
145    @Override
146    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
147        mXTileCount = (int) Math.floor(w / mTileSize);
148        mYTileCount = (int) Math.floor(h / mTileSize);
149
150        mXOffset = ((w - (mTileSize * mXTileCount)) / 2);
151        mYOffset = ((h - (mTileSize * mYTileCount)) / 2);
152
153        mTileGrid = new int[mXTileCount][mYTileCount];
154        clearTiles();
155    }
156
157}
158