Problems with the image after the rotation of the

Hello world

I'm turning my .png image using the ImageManipulator library. Current rotation works fine, BUT - my image with alpha background is rendered on a gray square instead of alpha channel. What should I do with my image? How to preserve this alpha channel after rotation?

OK, finally I managed to solve it. For those who are facing the same bugs with alpha channel by using ImageManipulator, you must change the method ' private Sub paintTransformedBitmap (Graphics g, int textureOriginX, int textureOriginY)

private void paintTransformedBitmap(Graphics g, int textureOriginX, int textureOriginY) { // Make the drawing space transparent first before painting g.setGlobalAlpha(getBackgroundAlpha()); g.setBackgroundColor(getBackgroundColor()); g.clear(); g.setGlobalAlpha(255); /** * Keep the precision of our transformation and Scale the drawing as * well. Scale is applied as though a matrix of the form * *

         * | ScaleX  0     0|
         * | 0    ScaleY   0|
         * | 0       0     1|
         *

* is multiplied by the Transformation matrix * / dux int = Fixed32.div (transformMatrix [UX], resultantScaleX); DVX int = Fixed32.div (transformMatrix [VX], resultantScaleY); Duy int = Fixed32.div (transformMatrix [UY], resultantScaleX); dvy int = Fixed32.div (transformMatrix [VY], resultantScaleY); Necessary for alpha changes with Graphics.Clear 6.0 / / g.setColor (Graphics.WHITE); g.drawFilledPath (bitmapXPts, bitmapYPts, null, null); g.drawTexturedPath (bitmapXPts, bitmapYPts, null, null, textureOriginX, textureOriginY, dux, dvx, duy, dvy, bitmap); }

Notice the end of the method - setColor and drawFilledPath now commented and image appears.

Tags: BlackBerry Developers

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