private Polygon GetCollisionBox(PointF center, SizeF offset, SizeF size, float angle)
{
var xPlus = Config.Envelope.MinX / SphericalMercator.Resolution(Config.ZoomLevel);
var yPlus = -Config.Envelope.MaxY / SphericalMercator.Resolution(Config.ZoomLevel);
var halfWidth = size.Width * 0.5f;
var halfHeight = size.Height * 0.5f;
var rotation = new Matrix();
rotation.RotateAt(angle, center);
var points = new[]
{
new PointF(center.X + offset.Width + halfWidth, center.Y + offset.Height + halfHeight),
new PointF(center.X + offset.Width - halfWidth, center.Y + offset.Height + halfHeight),
new PointF(center.X + offset.Width - halfWidth, center.Y + offset.Height - halfHeight),
new PointF(center.X + offset.Width + halfWidth, center.Y + offset.Height - halfHeight)
};
rotation.TransformPoints(points);
var poly = new Polygon(new LinearRing(new[]
{
new Coordinate(xPlus + points[0].X, yPlus + points[0].Y),
new Coordinate(xPlus + points[1].X, yPlus + points[1].Y),
new Coordinate(xPlus + points[2].X, yPlus + points[2].Y),
new Coordinate(xPlus + points[3].X, yPlus + points[3].Y),
new Coordinate(xPlus + points[0].X, yPlus + points[0].Y)
}));
return(poly);
}
internal PointF[] Project(Coordinate[] coords)
{
//TODO: Could consider simplifying https://github.com/mourner/simplify-js
//TODO: Clip polygons to map edge?
var spanX = Config.Envelope.MaxX - Config.Envelope.MinX;
var spanY = Config.Envelope.MaxY - Config.Envelope.MinY;
var reso = SphericalMercator.Resolution(Config.ZoomLevel);
var res = new PointF[coords.Length];
for (var i = 0; i < coords.Length; i++)
{
var c = coords[i];
res[i] = new PointF(
(float)((c.X - Config.Envelope.MinX) * SphericalMercator.TileSize / spanX),
(float)((c.Y - Config.Envelope.MaxY) * SphericalMercator.TileSize / -spanY)
);
}
return(res);
}