private List <Delaunay.DVertex> GenVertices(int vertexCount, float innerRadius, float outterRadius, int slpiceSegment, FPseudoRandom rnd)
{
float cx = .5f * this.col;
float cy = .5f * this.row;
float hw = .5f * (this.col - 1);
float hh = .5f * (this.row - 1);
List <Delaunay.DVertex> vertices = new List <Delaunay.DVertex>();
for (int i = 0; i < vertexCount; i++)
{
//横轴半径
int r1 = ( int )(hw * (rnd.NextFloat() * (outterRadius - innerRadius) + innerRadius));
//纵轴半径
int r2 = ( int )(hh * (rnd.NextFloat() * (outterRadius - innerRadius) + innerRadius));
//随机角度
float sita = rnd.NextFloat() * MathUtils.PI * 2f;
//椭圆极坐标参数方程
int x = ( int )(cx + r1 * MathUtils.Cos(sita));
int y = ( int )(cy + r2 * MathUtils.Sin(sita));
vertices.Add(new Delaunay.DVertex(x, y));
}
//取半径的平均单位比例
float avgRadius = (outterRadius + innerRadius) * 0.5f;
//椭圆周长近似公式
float p = MathUtils.Sqrt(0.5f * avgRadius * avgRadius * (hw * hw + hh * hh));
//按给定的分段数计算阈值
float threshold = 2f * MathUtils.PI * p / slpiceSegment;
//去掉距离较近的顶点
TripVertex(vertices, threshold);
return(vertices);
}
private Graph2D CreateFullDigraph(FPseudoRandom random)
{
Graph2D graph = new Graph2D(this.row, this.col);
for (int i = 1; i < this.row - 1; i++)
{
for (int j = 1; j < this.col - 1; j++)
{
int cur = i * this.col + j;
GraphNode node = graph[cur];
if (j < this.col - 2)
{
node.AddEdge(cur, cur + 1, random.NextFloat());
}
if (j > 1)
{
node.AddEdge(cur, cur - 1, random.NextFloat());
}
}
}
for (int i = 1; i < this.col - 1; i++)
{
for (int j = 1; j < this.row - 1; j++)
{
int cur = j * this.col + i;
GraphNode node = graph[cur];
if (j < this.row - 2)
{
node.AddEdge(cur, cur + this.col, random.NextFloat());
}
if (j > 1)
{
node.AddEdge(cur, cur - this.col, random.NextFloat());
}
}
}
return(graph);
}
