/// <summary>
/// Split a region into top, middle, and bottom sections.
/// Split along points 1 & 2.
/// If resulting rect has zero height it is omitted from the results.
/// </summary>
private static List <ImageComponent> SplitAlongY(
int x,
int y,
int width,
int height,
int ySplit1,
int ySplit2,
TileBias xBias)
{
Contract.Requires(height != 0);
Contract.Requires(ySplit1 >= y);
Contract.Requires(ySplit2 >= y && ySplit2 > ySplit1);
var split = new List <ImageComponent>(3);
if (width == 0)
{
return(split);
}
// top
if (ySplit1 - y > 0)
{
var top = new Rectangle(x, y, width, ySplit1 - y);
split.Add(new ImageComponent(top, xBias, TileBias.Negative));
}
// middle
if (ySplit2 - ySplit1 > 0)
{
var middle = new Rectangle(x, ySplit1, width, ySplit2 - ySplit1);
split.Add(new ImageComponent(middle, xBias, TileBias.Neutral));
}
// bottom
if (y + height - ySplit2 > 0)
{
var bottom = new Rectangle(x, ySplit2, width, y + height - ySplit2);
split.Add(new ImageComponent(bottom, xBias, TileBias.Positive));
}
return(split);
}
public ImageComponent(Rectangle fragment, TileBias xBias, TileBias yBias)
{
this.Fragment = fragment;
this.XBias = xBias;
this.YBias = yBias;
}