/// <summary>
/// 对方向进行判断，若方向符合条件则渲染连接桥（四边型）以及对应的三角形
/// </summary>
/// <param name="direction">对应处理的方向</param>
/// <param name="cell">六边形</param>
/// <param name="v1">六边形内上顶点</param>
/// <param name="v2">六边形内下顶点</param>
void TriangulateConnection(HexDirection direction, HexCell cell, Vector3 v1, Vector3 e1, Vector3 e2, Vector3 e3, Vector3 v2)
{
if (direction <= HexDirection.SE && cell.GetNeighbor(direction) != null)
{
//添加矩形连接桥
HexCell neighbor = cell.GetNeighbor(direction) ?? cell;
Vector3 bright = HexMetrics.GetBirdge(direction);
Vector3 v3 = v1 + bright;
Vector3 v4 = v2 + bright;
//将对面连接点添加高度修正
v3.y = v4.y = neighbor.Position.y;
//增加多顶点，添加细节
//e4,e5,e6为对面顶点
Vector3 e4 = Vector3.Lerp(v3, v4, 0.25f);
Vector3 e5 = Vector3.Lerp(v3, v4, 0.5f);
Vector3 e6 = Vector3.Lerp(v3, v4, 0.75f);
if (cell.HasRiverThroughEdge(direction))
{
e5.y = neighbor.StreamBedY;
}
//限制只在倾斜时进行阶梯化
if (cell.GetEdgeType(direction) == HexEdgeType.Slope)
{
TriangulateEdgeTerraces(v1, e1, cell, v3, e4, neighbor);
TriangulateEdgeTerraces(e1, e2, cell, e4, e5, neighbor);
TriangulateEdgeTerraces(e2, e3, cell, e5, e6, neighbor);
TriangulateEdgeTerraces(e3, v2, cell, e6, v4, neighbor);
}
else
{
//AddQuad(v1, v2, v3, v4);
//AddQuadColor(cell.Color, neighbor.Color);
AddQuad(v1, e1, v3, e4);
AddQuadColor(cell.Color, neighbor.Color);
AddQuad(e1, e2, e4, e5);
AddQuadColor(cell.Color, neighbor.Color);
AddQuad(e2, e3, e5, e6);
AddQuadColor(cell.Color, neighbor.Color);
AddQuad(e3, v2, e6, v4);
AddQuadColor(cell.Color, neighbor.Color);
}
//处理三角形连接
HexCell nextNeighbor = cell.GetNeighbor(direction.Next());
if (nextNeighbor)
{
Vector3 v5 = v2 + HexMetrics.GetBirdge(direction.Next());
v5.y = nextNeighbor.Position.y;
//TriangulateCorner(v2, cell, v4, neighbor, v5, nextNeighbor);
//找出最小的一个cell，然后顺时针将三个cell传入
if (cell.Elevation <= neighbor.Elevation)
{
if (cell.Elevation <= nextNeighbor.Elevation)
{
TriangulateCorner(v2, cell, v4, neighbor, v5, nextNeighbor);
}
else
{
TriangulateCorner(v5, nextNeighbor, v2, cell, v4, neighbor);
}
}
else
{
if (neighbor.Elevation <= nextNeighbor.Elevation)
{
TriangulateCorner(v4, neighbor, v5, nextNeighbor, v2, cell);
}
else
{
TriangulateCorner(v5, nextNeighbor, v2, cell, v4, neighbor);
}
}
}
}
}