/// Returns the stripe vertex of the last point of the curve. The vertex lies on the way from the point to
/// the terrain boundary. The distance is computed so that it corresponds to the desired thickness of the stripe.
private Vector3 ComputeLastStripeVertex()
{
// boundary point
Vector2 endBorderPoint = TerrainCurve[TerrainCurve.Count - 1].position;
Boundary.ProjectEndPointToBoundary(ref endBorderPoint);
Vector3 lastStripeVertex = endBorderPoint;
if (endBorderPoint != TerrainCurve[TerrainCurve.Count - 1].position)
{
Vector2 delta2 = TerrainCurve[TerrainCurve.Count - 1].position - TerrainCurve[TerrainCurve.Count - 2].position;
Vector2 move2 = GetNodeStripeSize(TerrainCurve.Count - 1) * new Vector2(delta2.y, -delta2.x).normalized;
Vector2 borderDirection = endBorderPoint - TerrainCurve[TerrainCurve.Count - 1].position;
Vector2 move;
if (!e2dUtils.HalfLineAndLineIntersect(Vector2.zero, borderDirection, move2, move2 + delta2, out move))
{
// the segment is perpendicular to the border or is in concave angle to the border
move = Vector2.zero;
}
lastStripeVertex = TerrainCurve[TerrainCurve.Count - 1].position + move;
Boundary.EnsurePointIsInBoundary(ref lastStripeVertex);
}
return(lastStripeVertex);
}
/// Returns the stripe vertex of the first point of the curve. The vertex lies on the way from the point to
/// the terrain boundary. The distance is computed so that it corresponds to the desired thickness of the stripe.
private Vector3 ComputeFirstStripeVertex()
{
// boundary point
Vector2 startBorderPoint = TerrainCurve[0].position;
Boundary.ProjectStartPointToBoundary(ref startBorderPoint);
Vector3 firstStripeVertex = startBorderPoint;
if (startBorderPoint != TerrainCurve[0].position)
{
Vector2 delta1 = TerrainCurve[1].position - TerrainCurve[0].position;
Vector2 move1 = GetNodeStripeSize(0) * new Vector2(delta1.y, -delta1.x).normalized;
Vector2 borderDirection = startBorderPoint - TerrainCurve[0].position;
Vector2 move;
if (!e2dUtils.HalfLineAndLineIntersect(Vector2.zero, borderDirection, move1, move1 + delta1, out move))
{
// the segment is perpendicular to the border or is in concave angle to the border
move = Vector2.zero;
}
firstStripeVertex = TerrainCurve[0].position + move;
Boundary.EnsurePointIsInBoundary(ref firstStripeVertex);
}
return(firstStripeVertex);
}
/// Returns the stripe vertex of the given segment of the curve. The vertex goes towards the inside of the terrain.
/// The direction and distance is computed so that it complies to the desired thickness of the stripe.
private Vector3 ComputeStripeVertex(int nodeIndex)
{
// compute the stripe point from the segment stripes around this point
Vector2 delta1 = TerrainCurve[nodeIndex + 0].position - TerrainCurve[nodeIndex - 1].position;
Vector2 delta2 = TerrainCurve[nodeIndex + 1].position - TerrainCurve[nodeIndex + 0].position;
Vector2 move1 = new Vector2(delta1.y, -delta1.x).normalized;
Vector2 move2 = new Vector2(delta2.y, -delta2.x).normalized;
Vector2 move = GetNodeStripeSize(nodeIndex) * (move1 + move2).normalized;
Vector3 stripeVertex = TerrainCurve[nodeIndex].position + move;
// NOTE: by disabling this we allowed the stripe to reach out of the terrain boundary. The user will fix
// the boundary if he doesn't like that.
// But right now it seems better when it's enabled.
Boundary.EnsurePointIsInBoundary(ref stripeVertex);
return(stripeVertex);
}