private void BuildWater(Path clipRect)
{
_clipper.AddPaths(_tile.Canvas.Water.Select(a => a.Points),
PolyType.ptSubject, _scale, true);
var solution = new Paths();
_clipper.Execute(ClipType.ctUnion, solution);
_clipper.Clear();
_water = new MeshCanvas.Region {
Shape = ClipByRectangle(clipRect, solution)
};
}
private void BuildRoads(Path clipRect)
{
var carRoadPaths = GetOffsetSolution(
BuildRoadMap(_tile.Canvas.Roads.Where(r => r.Type == RoadElement.RoadType.Car)));
var walkRoadsPaths = GetOffsetSolution(
BuildRoadMap(_tile.Canvas.Roads.Where(r => r.Type == RoadElement.RoadType.Pedestrian)));
_clipper.AddPaths(carRoadPaths, PolyType.ptClip, true);
_clipper.AddPaths(walkRoadsPaths, PolyType.ptSubject, true);
var extrudedWalkRoads = new Paths();
_clipper.Execute(ClipType.ctDifference, extrudedWalkRoads);
_clipper.Clear();
_carRoads = CreateRoadRegionData(clipRect, carRoadPaths);
_walkRoads = CreateRoadRegionData(clipRect, extrudedWalkRoads);
}
private void BuildBackground(Path clipRect)
{
_clipper.AddPath(clipRect, PolyType.ptSubject, true);
_clipper.AddPaths(_carRoads.Shape, PolyType.ptClip, true);
_clipper.AddPaths(_walkRoads.Shape, PolyType.ptClip, true);
_clipper.AddPaths(_water.Shape, PolyType.ptClip, true);
_clipper.AddPaths(_surfaces.SelectMany(r => r.Shape), PolyType.ptClip, true);
var solution = new Paths();
_clipper.Execute(ClipType.ctDifference, solution, PolyFillType.pftPositive,
PolyFillType.pftPositive);
_clipper.Clear();
_background = new MeshCanvas.Region()
{
Shape = solution
};
}
private MeshRegion CreateMeshRegions(Path clipRect, MeshCanvas.Region region,
RenderMode renderMode, ref Rectangle2d rect, bool useContours = false)
{
using (var polygon = new Polygon(256, _objectPool))
{
var simplifiedPath = ClipByRectangle(clipRect, region.Shape);
var contours = new List <List <Point> >(useContours ? simplifiedPath.Count : 0);
foreach (var path in simplifiedPath)
{
var area = Clipper.Area(path);
// skip small polygons to prevent triangulation issues
if (Math.Abs(area / DoubleScale) < 0.001)
{
continue;
}
var vertices = GetVertices(path, renderMode, ref rect);
// sign of area defines polygon orientation
polygon.AddContour(vertices, area < 0);
if (useContours)
{
contours.Add(vertices);
}
}
contours.ForEach(c => c.Reverse());
var mesh = polygon.Points.Any() ? GetMesh(polygon, renderMode) : null;
return(new MeshRegion
{
GradientKey = region.GradientKey,
ElevationNoiseFreq = region.ElevationNoiseFreq,
ColorNoiseFreq = region.ColorNoiseFreq,
ModifyMeshAction = region.ModifyMeshAction,
Mesh = mesh,
Contours = contours
});
}
}
