CODEWITHSUNDEEP
androidbitmapimageviewcoordinatestransform
Dardan
Dardan

Reputation: 531

Transform Bitmap or ImageView at specific coordinates

I am trying to transform bitmap and imageview by dragging points to specific coordinates Example this is drawing app. Which is the best way to make it ? Should i use OpenGL ? Thank You

EDIT: I fixed by using canvas.drawBitmapMesh thank you all for your help i really appreciate it .

Upvotes: 2

Views: 945

Answers (1)

Damian Petla
Damian Petla

Reputation: 9103

You can try creating second mutable bitmap like this

Bitmap originalBitmap;
Bitmap b = Bitmap.createBitmap(originalBitmap.getWidth(), originalBitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b)

Then you can draw original bitmap on top of new bitmap applying transformations. See Canvas API for more details.

For example use the following method:

c.drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint)

Update

Regarding use of Matrix, it's just a guess, you can try method mapPoints(float[] src, float[] dest). I also did a quick search on Google and found web page with examples. Have a look.

Update 2

Dardan was able to achieve his goal with the following method:

drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight, float[] verts, int vertOffset, int[] colors, int colorOffset, Paint paint);

Method description:

Draw the bitmap through the mesh, where mesh vertices are evenly distributed across the bitmap. There are meshWidth+1 vertices across, and meshHeight+1 vertices down. The verts array is accessed in row-major order, so that the first meshWidth+1 vertices are distributed across the top of the bitmap from left to right. A more general version of this method is drawVertices().

Upvotes: 1

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