public bool IsPointWithinContour(Vector2 xzPoint, IHexCell cell, HexDirection direction)
{
var contour = GetContourForCellEdge(cell, direction);
Vector2 midpoint = cell.AbsolutePositionXZ;
for (int i = 1; i < contour.Count; i++)
{
if (Geometry2D.IsPointWithinTriangle(xzPoint, midpoint, contour[i - 1], contour[i]))
{
return(true);
}
}
return(false);
}
public bool TryGetSextantOfPointInCell(Vector2 xzPoint, IHexCell cell, out HexDirection sextant)
{
sextant = HexDirection.NE;
foreach (var candidate in EnumUtil.GetValues <HexDirection>())
{
sextant = candidate;
if (Geometry2D.IsPointWithinTriangle(
xzPoint, cell.AbsolutePositionXZ,
cell.AbsolutePositionXZ + RenderConfig.GetFirstCornerXZ(candidate),
cell.AbsolutePositionXZ + RenderConfig.GetSecondCornerXZ(candidate)
))
{
return(true);
}
}
return(false);
}
public bool DoesXZFrustumOverlap(
Vector2 bottomLeftFrustum, Vector2 topLeftFrustum, Vector2 topRightFrustum, Vector2 bottomRightFrustum
)
{
Vector2 topMiddleFrustum = (topLeftFrustum + topRightFrustum) / 2f;
Vector2 bottomLeftChunk = transform.position.ToXZ();
Vector2 topLeftChunk = transform.position.ToXZ() + new Vector2(0f, Terrain.terrainData.size.z);
Vector2 topRightChunk = transform.position.ToXZ() + new Vector2(Terrain.terrainData.size.x, Terrain.terrainData.size.z);
Vector2 bottomRightChunk = transform.position.ToXZ() + new Vector2(Terrain.terrainData.size.x, 0f);
//The projected frustum is divided into three triangles, each of which are tested
return((
//Are the points in the rightmost triangle?
Geometry2D.IsPointWithinTriangle(bottomLeftChunk, bottomLeftFrustum, topLeftFrustum, topMiddleFrustum) ||
Geometry2D.IsPointWithinTriangle(topLeftChunk, bottomLeftFrustum, topLeftFrustum, topMiddleFrustum) ||
Geometry2D.IsPointWithinTriangle(topRightChunk, bottomLeftFrustum, topLeftFrustum, topMiddleFrustum) ||
Geometry2D.IsPointWithinTriangle(bottomRightChunk, bottomLeftFrustum, topLeftFrustum, topMiddleFrustum)
) || (
//Are the points in the leftmost triangle?
Geometry2D.IsPointWithinTriangle(bottomLeftChunk, bottomRightFrustum, topMiddleFrustum, topRightFrustum) ||
Geometry2D.IsPointWithinTriangle(topLeftChunk, bottomRightFrustum, topMiddleFrustum, topRightFrustum) ||
Geometry2D.IsPointWithinTriangle(topRightChunk, bottomRightFrustum, topMiddleFrustum, topRightFrustum) ||
Geometry2D.IsPointWithinTriangle(bottomRightChunk, bottomRightFrustum, topMiddleFrustum, topRightFrustum)
) || (
//Are the points in the middle triangle?
Geometry2D.IsPointWithinTriangle(bottomLeftChunk, bottomLeftFrustum, topMiddleFrustum, bottomRightFrustum) ||
Geometry2D.IsPointWithinTriangle(topLeftChunk, bottomLeftFrustum, topMiddleFrustum, bottomRightFrustum) ||
Geometry2D.IsPointWithinTriangle(topRightChunk, bottomLeftFrustum, topMiddleFrustum, bottomRightFrustum) ||
Geometry2D.IsPointWithinTriangle(bottomRightChunk, bottomLeftFrustum, topMiddleFrustum, bottomRightFrustum)
));
}