SetPolyToPoly not applicable

Question

Can someone help me with the graphical release that I have. This code does not apply setPolyToPoly at all .. it rotates the camera, but not polyToPoly conversion .. I don’t understand why ..

final Camera camera = mCamera; final Matrix matrix = t.getMatrix(); camera.save(); camera.translate(x, y, z); camera.getMatrix(matrix); camera.restore(); matrix.setPolyToPoly(sourceArr, 0, destArr, 0, sourceArr.length >> 1); matrix.preTranslate(-0, -height); matrix.postTranslate(0, height); 

Answer 1

This sample does not fully correspond to your question, but may lead you in the right direction. In this example, the matrix is ​​applied to a raster image that is placed in perspective. If I compare your snippet, you set a political copoly, but it does not apply to the camera.

  Bitmap bitmap2 = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888); Canvas canvas2 = new Canvas(bitmap2); canvas2.drawColor(Color.WHITE); Paint rectPaint2 = new Paint(); rectPaint2.setColor(Color.GREEN); canvas2.drawRect(20, 20, 180, 180, rectPaint2); Matrix matrix2 = new Matrix(); float deform2 = 20f; float[] src2 = new float[] { 0, 0, bitmap2.getWidth(), 0, bitmap2.getWidth(), bitmap2.getHeight(), 0, bitmap2.getHeight() }; float[] dst2 = new float[] { 0, 0, bitmap2.getWidth() - deform2, deform2, bitmap2.getWidth() - deform2, bitmap2.getHeight() - deform2, 0, bitmap2.getHeight() }; matrix2.setPolyToPoly(src2, 0, dst2, 0, src2.length >> 1); Bitmap bMatrix2= Bitmap.createBitmap(bitmap2, 0, 0, bitmap2.getWidth(), bitmap2.getHeight(), matrix2, true); ImageView ivSecond = (ImageView) findViewById(R.id.ivSecond); ivSecond.setImageBitmap(bMatrix2);