?
?
?
?
?
?
分析：
?
?
那还有一组 MRERSP_0 MRERSP_1是干什么的呢？
等下告诉你
如：选择90度? 那九十度就放进去a角里
Float [] x={1.0f,0.0f,0.0f,0.0f,-1.0f,0.0f,0.0f,0.0f,0.0f};
Matrix matrix=new Matrix();
matrix.setValues(f);
也有简单一点的：
matrix.setRotate(90);
?
如果想围绕哪个点：
matrix.setRotate(90,x,y);
matrix.setRotate(90,0,0);
?
或者：Float [] x={1.0f,0.0f,0.0f,0.0f,-1.0f,0.0f,0.0f,0.0f,0.0f};
而围绕100,100可以这样：如下：
Float [] x={
1.0f,0.0f,100.0f,
0.0f,-1.0f,100.0f,
0.0f,0.0f,0.0f};
现在清楚MRERSP_0 MRERSP_1是干什么的吧？
??
?
归根结底是这个图，重点在 a b d?e 记好他们的位置? 然后套用公式：
X=aX1+bY1;
Y=dX1+eY1;
?
?
如：y=-x;
?
那需要什么条件? 问自己a b d e 怎么设置吧? 其他同理
对称效果图：
?
?
实例：
//锐化效果
? public static Bitmap toSharp(Bitmap bit)
???? {?
???????? long start =System.currentTimeMillis();?
???????? // 拉普拉斯矩阵??
???????? int[] laplacian = new int[] { -1, -1, -1, -1, 9, -1, -1, -1, -1 };?
??????????
???????? int width = bit.getWidth();?
???????? int height = bit.getHeight();?
???????? Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);?
??????????
???????? int pixR = 0;?
???????? int pixG = 0;?
???????? int pixB = 0;?
??????????
???????? int pixColor = 0;?
??????????
???????? int newR = 0;?
???????? int newG = 0;?
???????? int newB = 0;?
??????????
???????? int idx = 0;?
???????? float alpha = 0.3F;?
???????? int[] pixels = new int[width * height];?
???????? bit.getPixels(pixels, 0, width, 0, 0, width, height);?
???????? for (int i = 1, length = height - 1; i < length; i++)?
???????? {?
???????????? for (int k = 1, len = width - 1; k < len; k++)?
???????????? {?
???????????????? idx = 0;?
???????????????? for (int m = -1; m <= 1; m++)?
???????????????? {?
???????????????????? for (int n = -1; n <= 1; n++)?
???????????????????? {?
???????????????????????? pixColor = pixels[(i + n) * width + k + m];?
???????????????????????? pixR = Color.red(pixColor);?
???????????????????????? pixG = Color.green(pixColor);?
???????????????????????? pixB = Color.blue(pixColor);?
??????????????????????????
???????????????????????? newR = newR + (int) (pixR * laplacian[idx] * alpha);?
???????????????????????? newG = newG + (int) (pixG * laplacian[idx] * alpha);?
???????????????????????? newB = newB + (int) (pixB * laplacian[idx] * alpha);?
???????????????????????? idx++;?
???????????????????? }?
???????????????? }?
??????????????????
???????????????? newR = Math.min(255, Math.max(0, newR));?
???????????????? newG = Math.min(255, Math.max(0, newG));?
???????????????? newB = Math.min(255, Math.max(0, newB));?
??????????????????
???????????????? pixels[i * width + k] = Color.argb(255, newR, newG, newB);?
???????????????? newR = 0;?
???????????????? newG = 0;?
???????????????? newB = 0;?
???????????? }?
???????? }?
??????????
???????? bitmap.setPixels(pixels, 0, width, 0, 0, width, height);?
???????? long end = System.currentTimeMillis();?
???????? //Log.d("may", "used time="+(end - start));?
???????? return bitmap;?
???? }
?
? //旋轉90度
? public static Bitmap ToNinety(Bitmap bitmap){
?? int w=bitmap.getWidth();
?? int h=bitmap.getHeight();
?? float fw=((float)100/w);
?? float fh=((float)100/h);
?? Canvas canvas=new Canvas(bitmap);
?? Matrix matrix=new Matrix();
?? Paint paint=new Paint();
?? paint.setColor(Color.RED);
??
方便大家看 我把 数组这样写：
?? final float jingxiang[]={
???? 0.0f,1.0f,0.0f,
???? -1.0f,0.0f,0.0f,
???? 0.0f,0.0f,1.0f};
??
??matrix.setValues(jingxiang);
??//matrix.setRotate(90);
??matrix.postScale(fw, fh);
??
??canvas.drawBitmap(bitmap, matrix, paint);
??Bitmap newbitmap = Bitmap.createBitmap(bitmap, 0, 0, w,h, matrix, true);
??return newbitmap;
? }
这里有个要点：并不是每个createBitmap()方法都可以达到你想要的，不同参数效果不一样，我觉得归根结底是哪个true 影响了一切
但有些效果又不用带true参数的createBitmap（）方法
如黑白照片效果：
//把图片变成黑白
?public static Bitmap toGrayscale(Bitmap bmpOriginal) {
??int width, height;
??height = bmpOriginal.getHeight();
??width = bmpOriginal.getWidth();
??Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,
????Bitmap.Config.RGB_565);
??Canvas c = new Canvas(bmpGrayscale);
??Paint paint = new Paint();
??ColorMatrix cm = new ColorMatrix();
??cm.setSaturation(0);
??ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
??paint.setColorFilter(f);
??c.drawBitmap(bmpOriginal, 0, 0, paint);
??return bmpGrayscale;
?}
还有图片的变化等效果? 想怎样就怎么去计算吧 哈
?
接下来介绍
ColorMatrix
?
?
?
大家可以把那个有颜色坐标看成一个六面体 每个面都是混合颜色的渐变效果
这个ColorMatrix我犯错就搞了一日了。。虽然很浪费时间 但是却是知道了更多
原理与Matrix 差不多
只是数组变成RGBA
所谓的Red Green Blue Alpha
通常：
1 ,0 ,0, 0, 0,
0 ,1 ,0 ,0 ,0,
0 ,0, 1, 0, 0,
0 ,0 ,0 ,1 ,0?
这样就是普通效果
现在可以根据参数来设置自己的效果了
简单例子：
?
public static Bitmap What(Bitmap bitmap) {
??? int w=bitmap.getWidth();
??? int h=bitmap.getHeight();
??? Bitmap result = Bitmap.createBitmap(w, h,
??????Bitmap.Config.RGB_565);
????Canvas c = new Canvas(bmpGrayscale);
????Paint paint = new Paint();
????ColorMatrix cm = new ColorMatrix();
????cm.set(new float[]{
??????1 ,0 ,0, 0, 0,
??????0 ,1 ,0 ,0 ,0,
??????0 ,0, 1, 0, 0,
??????0 ,0 ,0 ,1 ,0
????});
????ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
????paint.setColorFilter(f);
????c.drawBitmap(bitmap, 0, 0, paint);
????return result;???
??}
?
?
有一个也挺好玩的就是黑白效果介绍那里
?
?
?
??int width, height;
??height = bmpOriginal.getHeight();
??width = bmpOriginal.getWidth();
??Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,
????Bitmap.Config.RGB_565);
??Canvas c = new Canvas(bmpGrayscale);
??Paint paint = new Paint();
??ColorMatrix cm = new ColorMatrix();
??cm.setSaturation(0);
??ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
??paint.setColorFilter(f);
??c.drawBitmap(bmpOriginal, 0, 0, paint);
??return bmpGrayscale;
?}
?
?