package liu.roundimagedemo.view;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import com.squareup.picasso.Transformation;
/**
* Created by 刘楠 on 2016/8/31 0031.23:09
*/
public class CircleTransform implements Transformation {
@Override
public Bitmap transform(Bitmap source) {
/**
* 求出宽和高的哪个小
*/
int size = Math.min(source.getWidth(), source.getHeight());
/**
* 求中心点
*/
int x = (source.getWidth() - size) / 2;
int y = (source.getHeight() - size) / 2;
/**
* 生成BitMap
*/
Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
if (squaredBitmap != source) {
//释放
source.recycle();
}
/**
* 建立新的Bitmap
*/
Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());
/**
* 画布画笔
*/
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
BitmapShader shader = new BitmapShader(squaredBitmap,
BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
paint.setShader(shader);
paint.setAntiAlias(true);
float r = size / 2f;
/**
* 画圆
*/
canvas.drawCircle(r, r, r, paint);
squaredBitmap.recycle();
return bitmap;
}
@Override
public String key() {
return "circle";
}
}