public void GenerateRoadPolygon(int steps)
{
if (RoadPolygons == null)
{
RoadPolygons = new Ets2Point[0];
}
if (RoadPolygons != null && RoadPolygons.Count() == steps)
{
return;
}
if (StartNode == null || EndNode == null)
{
return;
}
if (Type != Ets2ItemType.Road)
{
return;
}
var ps = new Ets2Point[steps];
var sx = StartNode.X;
var ex = EndNode.X;
var sz = StartNode.Z;
var ez = EndNode.Z;
var radius = (float)Math.Sqrt((sx - ex) * (sx - ex) + (sz - ez) * (sz - ez));
var tangentSX = (float)Math.Cos(-StartNode.Yaw) * radius;
var tangentEX = (float)Math.Cos(-EndNode.Yaw) * radius;
var tangentSZ = (float)Math.Sin(-StartNode.Yaw) * radius;
var tangentEZ = (float)Math.Sin(-EndNode.Yaw) * radius;
for (int k = 0; k < steps; k++)
{
var s = (float)k / (float)(steps - 1);
var x = (float)Ets2CurveHelper.Hermite(s, sx, ex, tangentSX, tangentEX);
var z = (float)Ets2CurveHelper.Hermite(s, sz, ez, tangentSZ, tangentEZ);
ps[k] = new Ets2Point(x, 0, z, 0);
}
RoadPolygons = ps;
}
/// <summary>
/// Generate road curves for a specific lane. The curve is generated with [steps]
/// nodes and positioned left or right from the road's middle point.
/// Additionally, each extra lane is shifted 4.5 game units outward.
/// </summary>
/// <param name="steps"></param>
/// <param name="leftlane"></param>
/// <param name="lane"></param>
/// <returns></returns>
public IEnumerable <Ets2Point> GenerateRoadCurve(int steps, bool leftlane, int lane)
{
var ps = new Ets2Point[steps];
var sx = StartNode.X;
var ex = EndNode.X;
var sz = StartNode.Z;
var ez = EndNode.Z;
if (steps == 2)
{
sx += (float)Math.Sin(-StartNode.Yaw) * (leftlane ? -1 : 1) * (RoadLook.Offset + (0.5f + lane) * 4.5f);
sz += (float)Math.Cos(-StartNode.Yaw) * (leftlane ? -1 : 1) * (RoadLook.Offset + (0.5f + lane) * 4.5f);
ex += (float)Math.Sin(-EndNode.Yaw) * (leftlane ? -1 : 1) * (RoadLook.Offset + (0.5f + lane) * 4.5f);
ez += (float)Math.Cos(-EndNode.Yaw) * (leftlane ? -1 : 1) * (RoadLook.Offset + (0.5f + lane) * 4.5f);
ps[0] = new Ets2Point(sx, 0, sz, StartNode.Yaw);
ps[1] = new Ets2Point(ex, 0, ez, EndNode.Yaw);
return(ps);
}
var radius = (float)Math.Sqrt((sx - ex) * (sx - ex) + (sz - ez) * (sz - ez));
var tangentSX = (float)Math.Cos(-StartNode.Yaw) * radius;
var tangentEX = (float)Math.Cos(-EndNode.Yaw) * radius;
var tangentSZ = (float)Math.Sin(-StartNode.Yaw) * radius;
var tangentEZ = (float)Math.Sin(-EndNode.Yaw) * radius;
for (int k = 0; k < steps; k++)
{
var s = (float)k / (float)(steps - 1);
var x = (float)Ets2CurveHelper.Hermite(s, sx, ex, tangentSX, tangentEX);
var z = (float)Ets2CurveHelper.Hermite(s, sz, ez, tangentSZ, tangentEZ);
var tx = (float)Ets2CurveHelper.HermiteTangent(s, sx, ex, tangentSX, tangentEX);
var ty = (float)Ets2CurveHelper.HermiteTangent(s, sz, ez, tangentSZ, tangentEZ);
var yaw = (float)Math.Atan2(ty, tx);
x += (float)Math.Sin(-yaw) * (leftlane ? -1 : 1) * (RoadLook.Offset + (0.5f + lane) * 4.5f);
z += (float)Math.Cos(-yaw) * (leftlane ? -1 : 1) * (RoadLook.Offset + (0.5f + lane) * 4.5f);
ps[k] = new Ets2Point(x, 0, z, yaw);
}
return(ps);
}