安卓开发 bitmap实现旋转 缩放 变色 透明度绘制
//将bitmap渲染成指定颜色
public static Bitmap tintBitmap(Bitmap inBitmap , int tintColor) {
if (inBitmap == null) {
return null;
}
Bitmap outBitmap = Bitmap.createBitmap (inBitmap.getWidth(), inBitmap.getHeight() , inBitmap.getConfig());
Canvas canvas = new Canvas(outBitmap);
Paint paint = new Paint();
paint.setColorFilter( new PorterDuffColorFilter(tintColor, PorterDuff.Mode.SRC_IN)) ;
canvas.drawBitmap(inBitmap , 0, 0, paint) ;
return outBitmap ;
}这个方法不是很好，渲染之后的眼色变成一致的颜色了，对于线性图标确实不错，但有时候要的不是这种效果
if(color!=0){
float r = ((float)((color>>16)&0xff))/255;
float g = ((float)((color>>8)&0xff))/255;
float b = ((float)((color)&0xff))/255;
float a = ((float)alpha)/255;
// 生成色彩矩阵
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
r,0,0,0,0,
0,g,0,0,0,
0,0,b,0,0,
0,0,0,a,0
});
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
作者：石头
链接：https://www.jianshu.com/p/62fce0137867
bitmap翻转及镜像
Bitmap convert(Bitmap a, int width, int height)
{
int w = a.getWidth();
int h = a.getHeight();
Bitmap newb = Bitmap.createBitmap(ww, wh, Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
Canvas cv = new Canvas(newb);
Matrix m = new Matrix();
m.postScale(1, -1); //镜像垂直翻转
m.postScale(-1, 1); //镜像水平翻转
m.postRotate(-90); //旋转-90度
Bitmap new2 = Bitmap.createBitmap(a, 0, 0, w, h, m, true);
cv.drawBitmap(new2, new Rect(0, 0, new2.getWidth(), new2.getHeight()),new Rect(0, 0, ww, wh), null);
return newb;
}bitmap镜像绘制
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm3);
imageView1.setImageBitmap(bm);
Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
Canvas canvas = new Canvas(modBm);
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setAntiAlias(true);
Matrix matrix = new Matrix();
//matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
//matrix.setTranslate(20, 20);
//镜子效果
matrix.setScale(-1, 1);
matrix.postTranslate(bm.getWidth(), 0);
canvas.drawBitmap(bm, matrix, paint);
imageView2.setImageBitmap(modBm);
}最近在做精灵编辑器，需要用到一个可以同时支持旋转，翻转，变色，透明度绘制的方法，所以写了一个包含多种效果的集合方法
/**
* 实现图片的旋转 缩放 翻转 设置透明度绘制
* @param bitmap 图片
* @param origin_x 旋转 缩放 原点x
* @param origin_y 旋转 缩放原点 y
* @param x 绘制x坐标
* @param y 绘制y坐标
* @param zoom 缩放比例
* @param flag 翻转状态 1左右翻转 2上下翻转
* @param rotate 旋转角度
* @param alpha 不透明度
* @param color 颜色
*/
public static void drawBitmap(Canvas canvas,Bitmap bitmap, float origin_x, float origin_y, float x, float y, float zoom,int flag, float rotate, int alpha, int color){
Matrix matrix = new Matrix();
Paint paint = new Paint();
if (flag == 1) //左右翻转
matrix.setScale(-1, 1,origin_x,origin_y);
if (flag == 2) //上下翻转
matrix.setScale(1, -1,origin_x,origin_y);
// 缩放
matrix.postScale(zoom, zoom,origin_x,origin_y);
// 旋转
matrix.postRotate(rotate,origin_x,origin_y);
matrix.postTranslate(x,y);
//颜色渲染
/*
if(color!=0){
color = (alpha<<24)|(color&0xffffff);
paint.setColorFilter( new PorterDuffColorFilter(color, PorterDuff.Mode.SRC_IN)) ;
paint.setColor(color);
}
*/
if(color!=0){
float r = ((float)((color>>16)&0xff))/255;
float g = ((float)((color>>8)&0xff))/255;
float b = ((float)((color)&0xff))/255;
float a = ((float)alpha)/255;
// 生成色彩矩阵
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
r,0,0,0,0,
0,g,0,0,0,
0,0,b,0,0,
0,0,0,a,0
});
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
}
else{
//设置透明度
paint.setAlpha(alpha);
}
canvas.drawBitmap(bitmap,matrix,paint);
}超级绘图方法 这个方法主要是为手机CAPP做的
/**
* 实现图片的旋转 缩放 翻转 设置透明度绘制
* @param bitmap 图片
* @param origin_x 旋转 缩放 原点x
* @param origin_y 旋转 缩放原点 y
* @param x 绘制x坐标
* @param y 绘制y坐标
* @param zoom_v 纵向缩放比例
* @param zoom_h 横向缩放比例
* @param rotate 旋转角度
* @param color 颜色
*/
public void drawBitmap(Canvas canvas,Bitmap bitmap, float origin_x, float origin_y, float x, float y,
float zoom_h,float zoom_v,float rotate, int color){
Matrix matrix = new Matrix();
Paint paint = new Paint();
// 缩放
matrix.postScale(zoom_h, zoom_v,origin_x,origin_y);
// 旋转
matrix.postRotate(rotate,origin_x,origin_y);
matrix.postTranslate(x,y);
//颜色渲染
/*
if(color!=0){
color = (alpha<<24)|(color&0xffffff);
paint.setColorFilter( new PorterDuffColorFilter(color, PorterDuff.Mode.SRC_IN)) ;
paint.setColor(color);
}
*/
if(color!=0){
float r = ((float)((color>>16)&0xff))/255;
float g = ((float)((color>>8)&0xff))/255;
float b = ((float)((color)&0xff))/255;
float a = ((float)alpha)/255;
// 生成色彩矩阵
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
r,0,0,0,0,
0,g,0,0,0,
0,0,b,0,0,
0,0,0,a,0
});
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
}
canvas.drawBitmap(bitmap,matrix,paint);
}参考资料：
https://blog.csdn.net/harvic880925/article/details/512539
https://www.jb51.net/article/123593.htm
