android 将图片的四角圆化 与 剪裁圆形图片
/**
* 将图片的四角圆化
* @param bitmap 原图
* @param roundPixels 圆滑率
* @param half 是否截取半截
* @return
*/
public static Bitmap getRoundCornerImage(Bitmap bitmap, int roundPixels,int half)
{
int width=bitmap.getWidth();
int height=bitmap.getHeight();
//创建一个和原始图片一样大小位图
Bitmap roundConcerImage = Bitmap.createBitmap(width,height, Config.ARGB_8888);
//创建带有位图roundConcerImage的画布
Canvas canvas = new Canvas(roundConcerImage);
//创建画笔
Paint paint = new Paint();
//创建一个和原始图片一样大小的矩形
Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
RectF rectF = new RectF(rect);
// 去锯齿
paint.setAntiAlias(true);
//画一个和原始图片一样大小的圆角矩形
canvas.drawRoundRect(rectF, roundPixels, roundPixels , paint);
//设置相交模式
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
//把图片画到矩形去
canvas.drawBitmap(bitmap, null, rect, paint);
switch(half){
case HalfType.LEFT:
return Bitmap.createBitmap(roundConcerImage, 0, 0, width/2, height);
case HalfType.RIGHT:
return Bitmap.createBitmap(roundConcerImage, width/2, 0, width/2, height);
case HalfType.TOP:
return Bitmap.createBitmap(roundConcerImage, 0, 0, width, height/2);
case HalfType.BOTTOM:
return Bitmap.createBitmap(roundConcerImage, 0, height/2, width, height/2);
case HalfType.NONE:
return roundConcerImage;
default:
return roundConcerImage;
}
}
剪裁圆形图片
/**
* 转换图片成圆形
* @param bitmap 传入Bitmap对象
* @return
*/
public Bitmap toRoundBitmap(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float roundPx;
float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;
if (width <= height) {
roundPx = width / 2;
top = 0;
bottom = width;
left = 0;
right = width;
height = width;
dst_left = 0;
dst_top = 0;
dst_right = width;
dst_bottom = width;
} else {
roundPx = height / 2;
float clip = (width - height) / 2;
left = clip;
right = width - clip;
top = 0;
bottom = height;
width = height;
dst_left = 0;
dst_top = 0;
dst_right = height;
dst_bottom = height;
}
Bitmap output = Bitmap.createBitmap(width,
height, Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect src = new Rect((int)left, (int)top, (int)right, (int)bottom);
final Rect dst = new Rect((int)dst_left, (int)dst_top, (int)dst_right, (int)dst_bottom);
final RectF rectF = new RectF(dst);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, src, dst, paint);
return output;
}