gradient

public static void gradient(Graphics g, int color1, int color2, int left, int top, int width, int height, int orientation, int VERTICAL, boolean round) {
int max = orientation == VERTICAL ? height : width;

for (int i = 0; i < max; i++) {
int color = midColor(color1, color2, max * (max - 1 - i) / (max - 1), max);
g.setColor(color);
if (orientation == VERTICAL) {
if (i == 0 && round) {
g.drawLine(left + 3, top + i, left + width - 4, top + i);
} else if (i < 3 && round) {
g.drawLine(left + 1, top + i, left + width - 2, top + i);
} else {
g.drawLine(left, top + i, left + width - 1, top + i);
}

} else {
g.drawLine(left + i, top, left + i, top + height - 1);
}
}
}




public static int midColor(int color1, int color2, int prop, int max) {
int red = (((color1 >> 16) & 0xff) * prop + ((color2 >> 16) & 0xff) * (max - prop)) / max;
int green = (((color1 >> 8) & 0xff) * prop + ((color2 >> 8) & 0xff) * (max - prop)) / max;
int blue = (((color1 >> 0) & 0xff) * prop + ((color2 >> 0) & 0xff) * (max - prop)) / max;
int color = red << 16 | green << 8 | blue;
return color;
}