public VisibilityCheck(World world)
{
this.world = world;
this.trace = new DivLine();
this.occluder = new DivLine();
}
/// <summary>
/// Returns the fractional intercept point along the first divline.
/// This is only called by the addthings and addlines traversers.
/// </summary>
private Fixed InterceptVector(DivLine v2, DivLine v1)
{
var den = (v1.Dy >> 8) * v2.Dx - (v1.Dx >> 8) * v2.Dy;
if (den == Fixed.Zero)
{
return(Fixed.Zero);
}
var num = ((v1.X - v2.X) >> 8) * v1.Dy + ((v2.Y - v1.Y) >> 8) * v1.Dx;
var frac = num / den;
return(frac);
}
public PathTraversal(World world)
{
this.world = world;
this.intercepts = new Intercept[256];
for (var i = 0; i < this.intercepts.Length; i++)
{
this.intercepts[i] = new Intercept();
}
this.target = new DivLine();
this.trace = new DivLine();
this.lineInterceptFunc = this.AddLineIntercepts;
this.thingInterceptFunc = this.AddThingIntercepts;
}
