在java中为图像添加像素边框

Question

I am trying to create an image that adds a border to an existing image on Java by copying the pixels from their old locations to new coordinates. So far, this is what I have done:

 public static NewPic border(NewPic p, int borderWidth, Pixel borderColor) {
    int w = 2 * borderWidth;
    int h = 2 * borderWidth;


    Pixel[][] src = p.getBitmap();
    Pixel[][] tgt = new Pixel[w][h];

    for (int x = 0; x < w; x++) {
        for (int y = 0; y < h; y++) {
            if (x < borderWidth || x >= (w - borderWidth) ||
                    y < borderWidth)
                tgt[x][y] = borderColor;
            else
                tgt[x][y] = src[x - borderWidth][y - borderWidth]; 

        }
    }

return new NewPic(tgt);    

}

Not sure why this isn't passing my test case. Can anybody provide me with any guidance?

Thanks!

Answer 1

Shouldn't w and h be the width and height of src plus twice the borderwidth? You're creating tgt just big enough to hold the border color.

Hope that helps.

Answer 2

您可以使用图形和绘制线条。