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
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; } 原理：把某东西画到某东西上 cm.setSaturation(0); 根据不同参数也有不同效果 更多学习请看androidAPI 其实学习了这个android ==学习了Java==学习了C#
都有这样的东西吧 哈
转载于:https://www.cnblogs.com/dongdong230/p/4155890.html
