Android circular rectangular picture production, and a rectangular image fillets

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Generally do circular picture, can be achieved only on the basis of the square, otherwise it becomes an ellipse, the following talk about how to make a rectangular picture generate circular images

Ado, no map no truth, first on the map it:

Original:

After turn into a perfect circle:

On the following codes:

public static Bitmap makeRoundCorner(Bitmap bitmap)
    {
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        int left = 0, top = 0, right = width, bottom = height;
        float roundPx = height/2;
        if (width > height) {
            left = (width - height)/2;
            top = 0;
            right = left + height;
            bottom = height;
        } else if (height > width) {
            left = 0;
            top = (height - width)/2;
            right = width;
            bottom = top + width;
            roundPx = width/2;
        }
        ZLog.i(TAG, "ps:"+ left +", "+ top +", "+ right +", "+ bottom);

        Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        int color = 0xff424242;
        Paint paint = new Paint();
        Rect rect = new Rect(left, top, right, bottom);
        RectF rectF = new RectF(rect);

        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;
    }

Here again explain:

Since the image is a rectangle, the width of the image, high side will certainly be less than the other side, to generate a square side had the smallest reference, again cutting the other side of the display range of the positioning

As for the fillet radius is half the width of the square, used CSS to know, it is convenient border-radius circle is set to 50% on it, is a reason

android's UI is really too cumbersome

Draw a rectangle with rounded corners codes:

public static Bitmap makeRoundCorner(Bitmap bitmap, int px)
    {
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        int color = 0xff424242;
        Paint paint = new Paint();
        Rect rect = new Rect(0, 0, width, height);
        RectF rectF = new RectF(rect);
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, px, px, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
        return output;
    }

Reproduced in: https: //my.oschina.net/zhouz/blog/213164