public River(IslandTileCorner c)
{
this.data = c;
this.left = null;
this.right = null;
this.father = null;
}
//calculate elevation for each pixel
public float PixelElevation(Vector p, List <IslandTileCorner> bottomcorners)
{
//note: e0=u*e1+v*e2
IslandTileCorner c1 = bottomcorners[0];
IslandTileCorner c2 = bottomcorners[1];
Vector e0 = new Vector(p.data[0] - center.data[0], p.data[1] - center.data[1]);
//e0.data[0] = p.data[0] - center.data[0];
//e0.data[1] = p.data[1] - center.data[1];
Vector e1 = new Vector(c1.position.data[0] - center.data[0], c1.position.data[1] - center.data[1]);
//e1.data[0] = c1.position.data[0] - center.data[0];
//e1.data[1] = c1.position.data[1] - center.data[1];
Vector e2 = new Vector(c2.position.data[0] - center.data[0], c2.position.data[1] - center.data[1]);
//e2.data[0] = c2.position.data[0] - center.data[0];
//e2.data[1] = c2.position.data[1] - center.data[1];
double temp = e1.data[0] * e2.data[1] - e1.data[1] * e2.data[0];
double u = (e0.data[0] * e2.data[1] - e0.data[1] * e2.data[0]) / temp;
double v = (e0.data[1] * e1.data[0] - e0.data[0] * e1.data[1]) / temp;
//System.Console.WriteLine(u + " " + v);
float pixelelevation;
pixelelevation = (float)(elevation + (c1.elevation - elevation) * u + (c2.elevation - elevation) * v);
return(pixelelevation);
}
public void GenerateSubRiver(River sr)
{
//to make it easy I don't concider the subriver of a subriver
IslandTileCorner highest = sr.data;
foreach (var c in sr.data.adjacent)
{
if (c.elevation > highest.elevation)
{
highest = c;
}
}
if (sr.right == null)
{
sr.right = new River(highest);
sr.right.father = sr;
}
counts++;
if (counts < _subStreamLength)
{
GenerateSubRiver(sr.right);
}
}
//constructor of IslandTileEdge
public IslandTileEdge(VoronoiEdge e)
{
edge = e;
cornera = IslandTileCorner.Index[e.VVertexA];
cornerb = IslandTileCorner.Index[e.VVertexB];
}
public void AddCorners(VoronoiEdge e)
{
IslandTileCorner ca;
if (IslandTileCorner.Index.ContainsKey(e.VVertexA))
{
ca = IslandTileCorner.Index[e.VVertexA];
}
else
{//conflicts of out of boundaries
//and through this progress, all tile near border will be seted as water
//(IslandTile.water is false by default)
if (e.VVertexA.data[0] <= 0)
{
e.VVertexA.data[0] = 0;
//this.iswater = true;
}
if (e.VVertexA.data[0] >= (width - 1))
{
e.VVertexA.data[0] = (width - 1);
//this.iswater = true;
}
if (e.VVertexA.data[1] <= 0)
{
e.VVertexA.data[1] = 0;
//this.iswater = true;
}
if (e.VVertexA.data[1] >= (hight - 1))
{
e.VVertexA.data[1] = (hight - 1);
//this.iswater = true;
}
ca = new IslandTileCorner(e.VVertexA);
}
IslandTileCorner cb;
if (IslandTileCorner.Index.ContainsKey(e.VVertexB))
{
cb = IslandTileCorner.Index[e.VVertexB];
}
else
{
if (e.VVertexB.data[0] <= 0)
{
e.VVertexB.data[0] = 0;
//this.iswater = true;
}
if (e.VVertexB.data[0] >= (width - 1))
{
e.VVertexB.data[0] = (width - 1);
//this.iswater = true;
}
if (e.VVertexB.data[1] <= 0)
{
e.VVertexB.data[1] = 0;
//this.iswater = true;
}
if (e.VVertexB.data[1] >= (hight - 1))
{
e.VVertexB.data[1] = (hight - 1);
//this.iswater = true;
}
cb = new IslandTileCorner(e.VVertexB);
}
ca.adjacent.Add(cb);
cb.adjacent.Add(ca);
ca.protrudes.Add(e);
cb.protrudes.Add(e);
ca.touches.Add(this);
cb.touches.Add(this);
corners.Add(ca);
// total_corners.Add(ca);
corners.Add(cb);
//total_corners.Add(cb);
}
private void GenerateMainRiver(River rc)
{
IslandTileCorner maxima = rc.data;
bool existMaxima = false;
foreach (var c in rc.data.adjacent)
{
if (c.elevation > maxima.elevation)
{
maxima = c;
existMaxima = true;
}
}
if (!existMaxima)
{
return;
}
if (rc.right == null)
{
rc.right = new River(maxima);
rc.right.father = rc;
}
countm++;
if (countm < _mainStreamLength)
{
GenerateMainRiver(rc.right);
}
double doSplit = _rndGen.NextDouble();
if (doSplit > _riverSplitFreq)
{
return;
}
IslandTileCorner secondMaxima = rc.data;
bool existSecondMaxima = false;
foreach (var c in rc.data.adjacent)
{
if ((c.elevation > secondMaxima.elevation) && (c != maxima))
{
secondMaxima = c;
existSecondMaxima = true;
}
}
if (!existSecondMaxima)
{
return;
}
if (rc.left == null)
{
rc.left = new River(secondMaxima);
rc.left.father = rc;
}
GenerateSubRiver(rc.left);
counts = 0;
}
