仅舍入一个图像角 - 不是全部四个

Question

我正在使用这个非常普通的课程来圆角:

   public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
                .getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final int color = 0xff424242;
        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(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;
    }

我想修改它,以便只有左上角是圆角的.我在代码中找不到这个参数吗？有人可以帮忙吗？

Answer 1

这可能不是最有效的方法,但您可以通过在当前面具上绘画来填充圆角.您可以从当前代码开始,然后在适当的区域(角落)上使用canvas.drawRect(在调用之后canvas.drawRoundRect).我想像这样的东西只围绕左上角:

public static Bitmap getRoundedTopLeftCornerBitmap(Bitmap bitmap, int pixels) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
            .getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    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;
    final Rect topRightRect = new Rect(bitmap.getWidth()/2, 0, bitmap.getWidth(), bitmap.getHeight()/2);
    final Rect bottomRect = new Rect(0, bitmap.getHeight()/2, bitmap.getWidth(), bitmap.getHeight());

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
    // Fill in upper right corner
    canvas.drawRect(topRightRect, paint);
    // Fill in bottom corners
    canvas.drawRect(bottomRect, paint);

    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}

如果您愿意,可以在这里进行一些优化,但我认为它应该可行.一般的想法肯定应该.我没有尝试或测试过这个代码,如果pixels > bitmap.getWidth()/2或者它看起来不正确pixels > bitmap.getHeight()/2.然后,这也可能是真的.