这个算法对我很好。
private void FloodFill(Bitmap bmp, Point pt, int targetColor, int replacementColor) { Queue<Point> q = new linkedList<Point>(); q.add(pt); while (q.size() > 0) { Point n = q.poll(); if (bmp.getPixel(n.x, n.y) != targetColor) continue; Point w = n, e = new Point(n.x + 1, n.y); while ((w.x > 0) && (bmp.getPixel(w.x, w.y) == targetColor)) { bmp.setPixel(w.x, w.y, replacementColor); if ((w.y > 0) && (bmp.getPixel(w.x, w.y - 1) == targetColor)) q.add(new Point(w.x, w.y - 1)); if ((w.y < bmp.getHeight() - 1) && (bmp.getPixel(w.x, w.y + 1) == targetColor)) q.add(new Point(w.x, w.y + 1)); w.x--; } while ((e.x < bmp.getWidth() - 1) && (bmp.getPixel(e.x, e.y) == targetColor)) { bmp.setPixel(e.x, e.y, replacementColor); if ((e.y > 0) && (bmp.getPixel(e.x, e.y - 1) == targetColor)) q.add(new Point(e.x, e.y - 1)); if ((e.y < bmp.getHeight() - 1) && (bmp.getPixel(e.x, e.y + 1) == targetColor)) q.add(new Point(e.x, e.y + 1)); e.x++; } }}
