图片处理，圆形圆角描边

来源：互联网发布：css布局书籍知乎编辑：程序博客网时间：2024/05/16 00:24

 1.圆形描边

public static Bitmap getCircleCornerBitmap(Bitmap source,int strokeWidth){        if (source == null || source.isRecycled()) {            return null;        }        int srcBitmapWidth = source.getWidth();        int srcBitmapHeight = source.getHeight();        boolean isY;//是否根据y轴来切        int targetLength=(isY=srcBitmapWidth<srcBitmapHeight)?srcBitmapWidth:srcBitmapHeight;//取图片较短的边来作为要生成图片的长和宽        Bitmap targetBitmap=Bitmap.createBitmap(targetLength+strokeWidth*2,targetLength+strokeWidth*2, Bitmap.Config.ARGB_8888);        Canvas canvas=new Canvas(targetBitmap);        canvas.save();//保存画布,为画布移动作准备        canvas.translate(strokeWidth,strokeWidth);//移动画布,为的是生成圆形头像居中        Paint paint = new Paint();        paint.setAntiAlias(true);        RectF dstRectF=new RectF(0,0,targetLength,targetLength);        canvas.drawRoundRect(dstRectF,targetLength/2,targetLength/2,paint);//创建一个矩阵圆        Rect srcRect ;//源图片要截取对应的矩阵        if(isY){            srcRect = new Rect(0, (srcBitmapHeight-targetLength)/2,targetLength, (srcBitmapHeight-targetLength)/2+targetLength);        }else{            srcRect=new Rect((srcBitmapWidth-targetLength)/2,0,(srcBitmapWidth-targetLength)/2+targetLength,targetLength);        }        //关键方法,用于合成圆形图片，若有不明白的，可参照：http://blog.csdn.net/wangduanqing5945/article/details/38796269        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(source,srcRect,dstRectF,paint);        canvas.restore();//对应canvas.save()来使用,为了恢复画布,为描边做准备        Paint strokePaint=new Paint();//描边的画笔        strokePaint.setAntiAlias(true);        strokePaint.setStyle(Paint.Style.STROKE);        //透明度5%        strokePaint.setColor(Color.argb(13, 0, 0, 0));        strokePaint.setStrokeWidth(strokeWidth);        canvas.drawCircle(targetLength/2+strokeWidth,targetLength/2+strokeWidth,targetLength/2,strokePaint);//描边就是画一个圆形        return targetBitmap;    }

2.圆角

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),            bitmap.getHeight(), Bitmap.Config.ARGB_8888);    Canvas canvas = new Canvas(output);    final int color = 0xff000000;    final Paint paint = new Paint();    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());    final RectF rectF = new RectF(rect);    final float roundPx = pixels;    paint.setAntiAlias(true);    // canvas.drawARGB(0, 0, 0, 0);    paint.setColor(color);    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));    canvas.drawBitmap(bitmap, rect, rect, paint);    return output;}

透明度

100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C
50% — 80
45% — 73
40% — 66
35% — 59
30% — 4D
25% — 40
20% — 33
15% — 26
10% — 1A
5% — 0D
0% — 00
格式如#00FFFFFF，前两位代表不透明度的十六进制。00表示完全透明，FF就是全不透明。依次递增。

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