public static River CreateRiverObject(GraphPath riverPath, PolygonMapGenerator PMG)
{
//Debug.Log("Creating mesh for river with " + riverPath.Nodes.Count + " points");
// Calculate vertices of river polygon
List <Vector2> polygonVerticesHalf1 = new List <Vector2>();
List <Vector2> polygonVerticesHalf2 = new List <Vector2>();
for (int i = 1; i < riverPath.Nodes.Count - 1; i++)
{
Vector2 startPoint = riverPath.Nodes[i - 1].Vertex;
Vector2 thisPoint = riverPath.Nodes[i].Vertex;
Vector2 nextPoint = riverPath.Nodes[i + 1].Vertex;
float startWidth = riverPath.Nodes[i - 1].RiverWidth;
float endWidth = riverPath.Nodes[i].RiverWidth;
//Debug.Log("River point " + i + ": startWidth = " + startWidth + ", endWidth = " + endWidth);
if (i == 1) // Add two starting points
{
Vector2 rotatedVector = GeometryFunctions.RotateVector((thisPoint - startPoint).normalized * startWidth, 90);
polygonVerticesHalf1.Add(startPoint + rotatedVector);
polygonVerticesHalf2.Add(startPoint - rotatedVector);
}
polygonVerticesHalf1.Add(GeometryFunctions.GetOffsetIntersection(startPoint, thisPoint, nextPoint, startWidth, endWidth, true));
polygonVerticesHalf2.Add(GeometryFunctions.GetOffsetIntersection(startPoint, thisPoint, nextPoint, startWidth, endWidth, false));
if (i == riverPath.Nodes.Count - 2) // Add two ending points (calculate river delta by taking intersecion between river and shoreline
{
GraphNode lastNode = riverPath.Nodes.Last();
List <GraphConnection> shoreDelta = lastNode.Connections.Where(x => x.Type == BorderType.Shore).ToList();
List <GraphNode> riverDeltaPoints = new List <GraphNode>();
foreach (GraphConnection delta in shoreDelta)
{
if (delta.StartNode == lastNode)
{
riverDeltaPoints.Add(delta.EndNode);
}
else
{
riverDeltaPoints.Add(delta.StartNode);
}
}
Vector2 endPoint1, endPoint2;
// BUG: this method doesn't work 100%
GraphPolygon firstPolygon = riverPath.Nodes[i].Polygons.FirstOrDefault(x => GeometryFunctions.IsPointInPolygon4(x.Nodes.Select(x => x.Vertex).ToList(), polygonVerticesHalf1.Last()));
if (firstPolygon == null)
{
throw new Exception("Couldn't find direction of river delta. is river too short? length = " + riverPath.Nodes.Count);
}
bool addDeltaMidPoint = true;
if (riverDeltaPoints[0].Polygons.Contains(firstPolygon))
{
endPoint1 = GeometryFunctions.GetOffsetIntersection(thisPoint, nextPoint, riverDeltaPoints[0].Vertex, endWidth, 0f, true);
endPoint2 = GeometryFunctions.GetOffsetIntersection(thisPoint, nextPoint, riverDeltaPoints[1].Vertex, endWidth, 0f, false);
if (!GeometryFunctions.IsPointOnLineSegment(endPoint1, riverDeltaPoints[0].Vertex, lastNode.Vertex))
{
endPoint1 = lastNode.Vertex;
addDeltaMidPoint = false;
}
if (!GeometryFunctions.IsPointOnLineSegment(endPoint2, riverDeltaPoints[1].Vertex, lastNode.Vertex))
{
endPoint2 = lastNode.Vertex;
addDeltaMidPoint = false;
}
}
else
{
endPoint1 = GeometryFunctions.GetOffsetIntersection(thisPoint, nextPoint, riverDeltaPoints[1].Vertex, endWidth, 0f, true);
endPoint2 = GeometryFunctions.GetOffsetIntersection(thisPoint, nextPoint, riverDeltaPoints[0].Vertex, endWidth, 0f, false);
if (!GeometryFunctions.IsPointOnLineSegment(endPoint1, riverDeltaPoints[1].Vertex, lastNode.Vertex))
{
endPoint1 = lastNode.Vertex;
addDeltaMidPoint = false;
}
if (!GeometryFunctions.IsPointOnLineSegment(endPoint2, riverDeltaPoints[0].Vertex, lastNode.Vertex))
{
endPoint2 = lastNode.Vertex;
addDeltaMidPoint = false;
}
}
polygonVerticesHalf1.Add(endPoint1);
if (addDeltaMidPoint)
{
polygonVerticesHalf1.Add(lastNode.Vertex);
}
polygonVerticesHalf2.Add(endPoint2);
}
}
polygonVerticesHalf2.Reverse();
List <Vector2> polygonVertices = polygonVerticesHalf1;
polygonVertices.AddRange(polygonVerticesHalf2);
List <Vector2> polygonVerticesList = polygonVertices.ToList();
if (GeometryFunctions.IsClockwise(polygonVerticesList))
{
polygonVerticesList.Reverse();
}
// Create object
GameObject riverObject = MeshGenerator.GeneratePolygon(polygonVerticesList, PMG, layer: PolygonMapGenerator.LAYER_RIVER);
River river = riverObject.AddComponent <River>();
river.Init(riverPath.Nodes.Select(x => x.BorderPoint).ToList(), riverPath.Connections.Select(x => x.Border).ToList(), riverPath.Polygons.Select(x => x.Region).ToList());
riverObject.GetComponent <MeshRenderer>().material.color = Color.red;
riverObject.name = "River";
return(river);
}
