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POAndroid: how to warp images?
 

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  1. POAndroid: how to warp images?
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    <p>I want to warp images like this:</p> <p><img src="https://i.stack.imgur.com/IcWcW.jpg" alt="Example image"></p> <p><em>Added 08-04-2013</em>: I used this code but it's not working properly:</p> <pre><code> private static final int WIDTH = 20; private static final int HEIGHT = 20; private static final int COUNT = (WIDTH + 1) * (HEIGHT + 1); private final Bitmap mBitmap; private final float[] mVerts = new float[COUNT*2]; private final float[] mOrig = new float[COUNT*2]; private final Matrix mMatrix = new Matrix(); private final Matrix mInverse = new Matrix(); private static void setXY(float[] array, int index, float x, float y) { array[index*2 + 0] = x; array[index*2 + 1] = y; } public SampleView(Context context) { super(context); setFocusable(true); mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); float w = mBitmap.getWidth(); float h = mBitmap.getHeight(); // construct our mesh int index = 0; for (int y = 0; y &lt;= HEIGHT; y++) { float fy = h * y / HEIGHT; for (int x = 0; x &lt;= WIDTH; x++) { float fx = w * x / WIDTH; setXY(mVerts, index, fx, fy); setXY(mOrig, index, fx, fy); index += 1; } } mMatrix.setTranslate(10, 10); mMatrix.invert(mInverse); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(0xFFCCCCCC); canvas.concat(mMatrix); canvas.drawBitmapMesh(mBitmap, WIDTH, HEIGHT, mVerts, 0, null, 0, null); } private void warp(float cx, float cy) { final float K = 10000; float[] src = mOrig; float[] dst = mVerts; for (int i = 0; i &lt; COUNT*2; i += 2) { float x = src[i+0]; float y = src[i+1]; float dx = cx - x; float dy = cy - y; float dd = dx*dx + dy*dy; float d = FloatMath.sqrt(dd); float pull = K / (dd + 0.000001f); pull /= (d + 0.000001f); // android.util.Log.d("skia", "index " + i + " dist=" + d + " pull=" + pull); if (pull &gt;= 1) { dst[i+0] = cx; dst[i+1] = cy; } else { dst[i+0] = x + dx * pull; dst[i+1] = y + dy * pull; } } } private int mLastWarpX = -9999; // don't match a touch coordinate private int mLastWarpY; @Override public boolean onTouchEvent(MotionEvent event) { float[] pt = { event.getX(), event.getY() }; mInverse.mapPoints(pt); int x = (int)pt[0]; int y = (int)pt[1]; if (mLastWarpX != x || mLastWarpY != y) { mLastWarpX = x; mLastWarpY = y; warp(pt[0], pt[1]); invalidate(); } return true; } </code></pre>
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    1. COhttp://code.google.com/p/javamorph/ try this library.
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    2. COWhether you have seen this? https://github.com/huntergdavis/Easy_Image_Morph Hope this might help you.
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    3. COSharing your research helps everyone. Tell us what you've tried and why it didn’t meet your needs. This demonstrates that you’ve taken the time to try to help yourself, it saves us from reiterating obvious answers, and most of all it helps you get a more specific and relevant answer!
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