在OPhone编程中有时候需要对图片做特殊的处理，比如将图片做出黑白的，或者老照片的效果，有时候还要对图片进行变换，以拉伸，扭曲等等。这些效果在OPhone中有很好的支持，通过颜色矩阵（ColorMatrix）和坐标变换矩阵（Matrix）可以xx的做出上面的所说的效果，下面将分别介绍这两个矩阵的用法和相关的函数。

1. CMatrix类：
2. public class CMatrix extends Activity?{
4. private Button?change;
5. private EditText?[]?et=new EditText[20];
6. private float []carray=new float[20];
7. private MyImage?sv;
8. @Override
9. public void onCreate(Bundle?savedInstanceState)?{
10. super.onCreate(savedInstanceState);
11. setContentView(R.layout.main);
13. change=(Button)findViewById(R.id.set);
14. sv=(MyImage)findViewById(R.id.MyImage);
16. for(int i=0;i<20;i++){
18. et[i]=(EditText)findViewById(R.id.indexa+i);
19. carray[i]=Float.valueOf(et[i].getText().toString());
20. }
22. change.setOnClickListener(l);
23. }
25. private Button.OnClickListener?l=new Button.OnClickListener(){
27. @Override
28. public void onClick(View?arg0)?{
29. //?TODO?Auto-generated?method?stub
30. getValues();
31. sv.setValues(carray);
32. sv.invalidate();
33. }
35. };
36. public void getValues(){
37. for(int i=0;i<20;i++){
39. carray[i]=Float.valueOf(et[i].getText().toString());
40. }
42. }
45. }
46. MyImage类继承自View类：
47. public class MyImage extends View?{
48. private Paint?mPaint?= new Paint(Paint.ANTI_ALIAS_FLAG);
49. private Bitmap?mBitmap;
50. private float []?array=new float[20];
52. private float mAngle;
54. public MyImage(Context?context,AttributeSet?attrs)?{
55. super(context,attrs);
57. mBitmap????=?BitmapFactory.decodeResource(context.getResources(),
58. R.drawable.test);
59. invalidate();
60. }
63. public void setValues(float []?a){
64. for(int i=0;i<20;i++){
65. array[i]=a[i];
66. }
68. }
70. @Override protected void onDraw(Canvas?canvas)?{
71. Paint?paint?=?mPaint;
75. paint.setColorFilter(null);
76. canvas.drawBitmap(mBitmap,?0, 0,?paint);
78. ColorMatrix?cm?=?new ColorMatrix();
79. //设置颜色矩阵
80. cm.set(array);
81. //颜色滤镜，将颜色矩阵应用于图片
82. paint.setColorFilter(new ColorMatrixColorFilter(cm));
83. //绘图
84. canvas.drawBitmap(mBitmap,?0, 0,?paint);
85. Log.i(“CMatrix”, “———>onDraw”);
88. }
90. }?
    

1. CooMatrix 类：
3. public class CooMatrix extends Activity?{
5. private Button?change;
6. private EditText?[]?et=new EditText[9];
7. private float []carray=new float[9];
8. private MyImage?sv;
9. /**?Called?when?the?activity?is?first?created.?*/
10. @Override
11. public void onCreate(Bundle?savedInstanceState)?{
12. super.onCreate(savedInstanceState);
13. setContentView(R.layout.main);
15. change=(Button)findViewById(R.id.set);
16. sv=(MyImage)findViewById(R.id.MyImage);
18. for(int i=0;i<9;i++){
20. et[i]=(EditText)findViewById(R.id.indexa+i);
21. carray[i]=Float.valueOf(et[i].getText().toString());
23. }
25. change.setOnClickListener(l);
28. }
30. private Button.OnClickListener?l=new Button.OnClickListener(){
32. @Override
33. public void onClick(View?arg0)?{
34. //?TODO?Auto-generated?method?stub
35. getValues();
36. sv.setValues(carray);
37. sv.invalidate();
38. }
40. };
41. public void getValues(){
42. for(int i=0;i<9;i++){
44. carray[i]=Float.valueOf(et[i].getText().toString());
45. }
47. }
50. }
51. MyImage类继承自View类：
52. public class MyImage extends View?{
53. private Paint?mPaint?= new Paint(Paint.ANTI_ALIAS_FLAG);
54. private Bitmap?mBitmap;
55. private float []?array=new float[9];
59. public MyImage(Context?context,AttributeSet?attrs)?{
60. super(context,attrs);
62. mBitmap?=?BitmapFactory.decodeResource(context.getResources(),
63. R.drawable.ic_launcher_android);
64. invalidate();
65. }
68. public void setValues(float []?a){
69. for(int i=0;i<9;i++){
70. array[i]=a[i];
71. }
73. }
75. @Override protected void onDraw(Canvas?canvas)?{
76. Paint?paint?=?mPaint;
77. canvas.drawBitmap(mBitmap,?0, 0,?paint);
78. //new?一个坐标变换矩阵
79. Matrix?cm?=?new Matrix();
80. //为坐标变换矩阵设置响应的值
81. cm.setValues(array);
82. //按照坐标变换矩阵的描述绘图
83. canvas.drawBitmap(mBitmap,?cm,?paint);
84. Log.i(“CMatrix”, “———>onDraw”);
87. }
89. }?
    

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