流行的游戏Words with Friends在游戏板上绘制字母图块作为一个整体-
您可以在以下屏幕截图中看到应用于所有字母拼贴的黄色线性渐变，以及边缘上的浮雕效果：
在我的文字游戏中，我希望有类似的效果：
所以我创建了一个游戏板大小mBitmap，然后将所有图块绘制到其中，最后将位图绘制到我的自定义视图中-
设置：
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
// create yellow linear gradient
mGradStart = new Point(3 * mWidth / 4, mHeight / 3);
mGradEnd = new Point(mWidth / 4, 2 * mHeight / 3);
LinearGradient gradient = new LinearGradient(
mGradStart.x,
mGradStart.y,
mGradEnd.x,
mGradEnd.y,
new int[]{ 0xCCFFCC00, 0xCCFFCC99, 0xCCFFCC00 },
null,
TileMode.CLAMP);
// create the big bitmap holding all tiles
mBitmap = Bitmap.createBitmap(mWidth, mHeight, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mPaintGrad = new Paint();
mPaintGrad.setShader(gradient);
mPaintEmboss = new Paint();
mPaintEmboss.setShader(gradient);
EmbossMaskFilter filter = new EmbossMaskFilter(
new float[] { 0f, 1f, 0.5f }, 0.8f, 3f, 3f);
mPaintEmboss.setMaskFilter(filter);
绘画：
@Override
protected void onDraw(Canvas canvas) {
mGameBoard.draw(canvas);
// draw all tiles as rectangles into big bitmap
// (this code will move to onTouchEvent later)
mBitmap.eraseColor(Color.TRANSPARENT);
for (SmallTile tile: mTiles) {
mCanvas.drawRect(
tile.left,
tile.top,
tile.left + tile.width,
tile.top + tile.height,
mPaintGrad);
tile.draw(mCanvas);
}
canvas.drawBitmap(mBitmap, 0, 0, mPaintEmboss); // emboss NOT displayed
canvas.drawText("TEXT WORKS OK", 400, 400, mPaintEmboss); // ebmoss OK
canvas.drawRect(300, 600, 800, 1200, mPaintEmboss); // emboss OK
}
该EmbossMaskFilter效果适用于drawText()anddrawRect()调用，但不适用于drawBitmap()：
我的问题：是否可以使用PorterDuff.Mode（和extractAlpha？）的某些组合在我的大位图周围绘制浮雕？
更新：
通过查看HolographicOutlineHelper.java我已经能够添加外阴影：
在MyView.java中使用以下代码-
设置：
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
mScale = getResources().getDisplayMetrics().density;
mGradStart = new Point(3 * mWidth / 4, mHeight / 3);
mGradEnd = new Point(mWidth / 4, 2 * mHeight / 3);
LinearGradient gradient = new LinearGradient(
mGradStart.x,
mGradStart.y,
mGradEnd.x,
mGradEnd.y,
new int[]{ 0xCCFFCC00, 0xCCFFCC99, 0xCCFFCC00 },
null,
TileMode.CLAMP);
mBitmap = Bitmap.createBitmap(mWidth, mHeight, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mPaintGrad = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
mPaintGrad.setShader(gradient);
mPaintBlur = new Paint();
mPaintBlur.setColor(Color.BLACK);
BlurMaskFilter blurFilter = new BlurMaskFilter(mScale * 1, Blur.OUTER);
mPaintBlur.setMaskFilter(blurFilter);
}
绘画：
private void prepareBitmaps() {
mBitmap.eraseColor(Color.TRANSPARENT);
for (SmallTile tile: mTiles) {
mCanvas.drawRect(
tile.left,
tile.top,
tile.left + tile.width,
tile.top + tile.height,
mPaintGrad);
tile.draw(mCanvas);
}
mAlphaBitmap = mBitmap.extractAlpha(mPaintBlur, mOffset);
}
@Override
protected void onDraw(Canvas canvas) {
mGameBoard.draw(canvas);
canvas.drawBitmap(mAlphaBitmap, mOffset[0], mOffset[1], mPaintBlur);
canvas.drawBitmap(mBitmap, 0, 0, mPaintGrad);
}
但不幸的是，该应用程序现在运行缓慢 - 我仍然不知道如何在位图周围添加浮雕效果。
