/// <summary>
/// Returns TRUE if x,y is located on a road cell
/// </summary>
public bool IsRoad(DatLoader.Entity.ObjectDesc obj, float x, float y)
{
var cellX = (int)Math.Floor(x / LandDefs.CellLength);
var cellY = (int)Math.Floor(y / LandDefs.CellLength);
var terrain = Terrain[cellX * LandDefs.BlockSide + cellY]; // ensure within bounds?
return((terrain & 0x3) != 0); // TODO: more complicated check for within road range
}
/// <summary>
/// Aligns an object to a plane
/// </summary>
public static AFrame ObjAlign(DatLoader.Entity.ObjectDesc obj, Plane plane, Vector3 loc)
{
var frame = new AFrame(obj.BaseLoc);
frame.Origin = loc;
var negNormal = -plane.Normal;
var degrees = negNormal.get_heading();
frame.set_heading(degrees);
return(frame);
}
/// <summary>
/// Returns the rotation for a scenery object
/// </summary>
public static AFrame RotateObj(DatLoader.Entity.ObjectDesc obj, uint x, uint y, uint k, Vector3 loc)
{
var frame = new AFrame(obj.BaseLoc);
frame.Origin = loc;
if (obj.MaxRotation > 0.0f)
{
var degrees = (float)((1813693831 * y - (k + 63127) * (1360117743 * y * x + 1888038839) - 1109124029 * x) * 2.3283064e-10 * obj.MaxRotation);
frame.set_heading(degrees);
}
return(frame);
}
/// <summary>
/// Displaces a scenery object into a pseudo-randomized location
/// </summary>
/// <param name="obj">The object description</param>
/// <param name="ix">The global cell X-offset</param>
/// <param name="iy">The global cell Y-offset</param>
/// <param name="iq">The scene index of the object</param>
/// <returns>The new location of the object</returns>
public static Vector3 Displace(DatLoader.Entity.ObjectDesc obj, uint ix, uint iy, uint iq)
{
float x;
float y;
float z;
var loc = obj.BaseLoc.Origin;
if (obj.DisplaceX <= 0)
{
x = loc.X;
}
else
{
x = (float)((1813693831 * iy - (iq + 45773) * (1360117743 * iy * ix + 1888038839) - 1109124029 * ix)
* 2.3283064e-10 * obj.DisplaceX + loc.X);
}
if (obj.DisplaceY <= 0)
{
y = loc.Y;
}
else
{
y = (float)((1813693831 * iy - (iq + 72719) * (1360117743 * iy * ix + 1888038839) - 1109124029 * ix)
* 2.3283064e-10 * obj.DisplaceY + loc.Y);
}
z = loc.Z;
var quadrant = (1813693831 * iy - ix * (1870387557 * iy + 1109124029) - 402451965) * 2.3283064e-10;
if (quadrant >= 0.75)
{
return(new Vector3(y, -x, z));
}
if (quadrant >= 0.5)
{
return(new Vector3(-x, -y, z));
}
if (quadrant >= 0.25)
{
return(new Vector3(-y, x, z));
}
return(new Vector3(x, y, z));
}
/// <summary>
/// Returns the scale for a scenery object
/// </summary>
/// <param name="obj">The object decription</param>
/// <param name="x">The global cell X-offset</param>
/// <param name="y">The global cell Y-offset</param>
/// <param name="k">The scene index of the object</param>
public static float ScaleObj(DatLoader.Entity.ObjectDesc obj, uint x, uint y, uint k)
{
var scale = 1.0f;
var minScale = obj.MinScale;
var maxScale = obj.MaxScale;
if (minScale == maxScale)
{
scale = maxScale;
}
else
{
scale = (float)(Math.Pow(maxScale / minScale,
(1813693831 * y - (k + 32593) * (1360117743 * y * x + 1888038839) - 1109124029 * x) * 2.3283064e-10) * minScale);
}
return(scale);
}
/// <summary>
/// Returns TRUE if floor slope is within bounds for this object
/// </summary>
public static bool CheckSlope(DatLoader.Entity.ObjectDesc obj, float z)
{
return(z >= obj.MinSlope && z <= obj.MaxSlope);
}
