Android matrix camera處理圖片繞X軸Y軸翻轉(類似3D效果)

Android中實現圖片繞X軸、Y軸、Z軸翻轉可以使用matrix和camera，類似3D效果

具體參見代碼：

1. public class FlipImgEffectView extends View {
3. private Context context ;
4. private Bitmap showBmp ;
5. private Matrix matrix ; //作用矩陣
6. private Camera camera ;
7. private int deltaX , deltaY ; //翻轉角度差值
8. private int centerX , centerY ; //圖片中心點
10. public FlipImgEffectView(Context context) {
11. super(context);
12. this.context = context ;
13. initData();
14. }
16. private void initData(){
17. showBmp = BitmapFactory.decodeResource(context.getResources(), R.drawable.flower);
18. centerX = showBmp.getWidth()/2 ;
19. centerY = showBmp.getHeight()/2 ;
20. matrix = new Matrix();
21. camera = new Camera();
22. }
24. int lastMouseX ;
25. int lastMouseY ;
26. @Override
27. public boolean dispatchTouchEvent(MotionEvent event) {
28. int x = (int) event.getX();
29. int y = (int) event.getY();
30. switch(event.getAction()) {
31. case MotionEvent.ACTION_DOWN:
32. lastMouseX = x ;
33. lastMouseY = y ;
34. break;
35. case MotionEvent.ACTION_MOVE:
36. int dx = x - lastMouseX ;
37. int dy = y - lastMouseY ;
38. deltaX += dx ;
39. deltaY += dy ;
40. break;
41. }
43. invalidate();
44. return true;
45. }
47. @Override
48. protected void onDraw(Canvas canvas) {
50. camera.save();
51. //繞X軸翻轉
52. camera.rotateX(-deltaY);
53. //繞Y軸翻轉
54. camera.rotateY(deltaX);
55. //設置camera作用矩陣
56. camera.getMatrix(matrix);
57. camera.restore();
58. //設置翻轉中心點
59. matrix.preTranslate(-this.centerX, -this.centerY);
60. matrix.postTranslate(this.centerX, this.centerY);
62. canvas.drawBitmap(showBmp, matrix, null);
63. }
65. }

效果如圖：