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PORotate a bitmap in android about a point without animation of view
 

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  1. PORotate a bitmap in android about a point without animation of view
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    <p>I found some good resources for rotating a bitmap in android here and elsewher eon the net. I am close to getting my code to work but apparently I don't fully understand how the Matrix Translations work. The following is three main functions from my sprite class. THey worked great before I added things to facilitate the matrix rotation (namely in the onDraw I called the draw with just x,y and no matrix). I wrote some test code to add a sprite, and rotate it from 0 to 360 and back to 0 again repeatedly. It results it in rotating about like its orbiting some odd point. In reality I want it to just sit there and spin:</p> <pre><code>public void Rotate_Sprite(int transform, int deg) { int spriteCenterX = x+(width/2); int spriteCenterY = y+(height/2); mMatrix.setRotate(deg, spriteCenterX, spriteCenterY); } public void Draw_Sprite(Canvas c) { //c.drawBitmap(images[curr_frame], x, y, null); //this worked great esp in move sprite c.drawBitmap(images[curr_frame], mMatrix, null); } public void Create_Sprite(blah blah) { ... ... mMatrix = new Matrix(); mMatrix.reset(); } public int Move_Sprite() { //with the matrix stuff, I assume I need a translate. But it does't work right //for me at all. int lastx=this.x; int lasty=this.y; this.x+=this.vx; this.y+=this.vy; mMatrix.postTranslate(lastX-x,lastY-y); //doesn't work at all } </code></pre> <p>I did find this <a href="https://stackoverflow.com/questions/1478849/j2me-like-sprite-on-android"> J2me like reference here.</a> Though it seems to have all my sprites I call rotate on in orbit around one point.</p>
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