public static void Swirl(SS_Texture texture, int aX, int aY, int radius, float twists)
{
SS_Texture tmpTexture = new SS_Texture(texture.Width, texture.Height, Color.clear);
for (int y = 0; y < texture.Height; y++)
{
for (int x = 0; x < texture.Width; x++)
{
// compute the distance and angle from the swirl center:
int pixelX = x - aX;
int pixelY = y - aY;
float pixelDistance = Mathf.Sqrt((pixelX * pixelX) + (pixelY * pixelY));
float pixelAngle = Mathf.Atan2(pixelY, pixelX);
// work out how much of a swirl to apply (1.0 in the center fading out to 0.0 at the radius):
float swirlAmount = 1.0f - (pixelDistance / radius);
if (swirlAmount > 0.0f)
{
float twistAngle = twists * swirlAmount * Mathf.PI * 2.0f;
// adjust the pixel angle and compute the adjusted pixel co-ordinates:
pixelAngle += twistAngle;
pixelX = (int)(Mathf.Cos(pixelAngle) * pixelDistance);
pixelY = (int)(Mathf.Sin(pixelAngle) * pixelDistance);
}
// read and write the pixel
tmpTexture.SetPixel(x, y, texture.GetPixel(aX + pixelX, aY + pixelY));
}
}
texture.SetPixels(tmpTexture.GetPixels());
}
public static void FloodFillArea(SS_Texture texture, SS_Point pt, Color aColor)
{
int w = texture.Width;
int h = texture.Height;
Color[] colors = texture.GetPixels();
Color refCol = colors[pt.x + pt.y * w];
Queue <SS_Point> nodes = new Queue <SS_Point>();
nodes.Enqueue(new SS_Point(pt.x, pt.y));
while (nodes.Count > 0)
{
SS_Point current = nodes.Dequeue();
for (int i = current.x; i < w; i++)
{
Color C = colors[i + current.y * w];
if (C != refCol || C == aColor)
{
break;
}
colors[i + current.y * w] = aColor;
if (current.y + 1 < h)
{
C = colors[i + current.y * w + w];
if (C == refCol && C != aColor)
{
nodes.Enqueue(new SS_Point(i, current.y + 1));
}
}
if (current.y - 1 >= 0)
{
C = colors[i + current.y * w - w];
if (C == refCol && C != aColor)
{
nodes.Enqueue(new SS_Point(i, current.y - 1));
}
}
}
for (int i = current.x - 1; i >= 0; i--)
{
Color C = colors[i + current.y * w];
if (C != refCol || C == aColor)
{
break;
}
colors[i + current.y * w] = aColor;
if (current.y + 1 < h)
{
C = colors[i + current.y * w + w];
if (C == refCol && C != aColor)
{
nodes.Enqueue(new SS_Point(i, current.y + 1));
}
}
if (current.y - 1 >= 0)
{
C = colors[i + current.y * w - w];
if (C == refCol && C != aColor)
{
nodes.Enqueue(new SS_Point(i, current.y - 1));
}
}
}
}
texture.SetPixels(colors);
}
