public static IEnumerable <GridVector> ScaDir(Vector2 start, Vector2 dir, float dist)
{
GridVector startGrid = new GridVector(start);
if (Mathf.Abs(dir.x) >= Mathf.Abs(dir.y))
{
foreach (GridVector point in scanX(startGrid, dir, dist))
{
yield return(point);
}
}
else
{
foreach (GridVector point in scanY(startGrid, dir, dist))
{
yield return(point);
}
}
}
static IEnumerable <GridVector> scanY(GridVector start, Vector2 dir, float dist)
{
float ratioXY = Mathf.Abs(dir.x / dir.y);
dist /= GRID_SIZE;
int disty = Mathf.CeilToInt(dist / Mathf.Sqrt(1 + ratioXY * ratioXY));
int signx = (int)Mathf.Sign(dir.x);
int signy = (int)Mathf.Sign(dir.y);
for (int y = 0; y <= disty; ++y)
{
int x = Mathf.RoundToInt(y * ratioXY);
GridVector grid = new GridVector(start.x + x * signx, start.y + y * signy);
yield return(grid);
yield return(grid + GridVector.left);
yield return(grid + GridVector.right);
}
}
static IEnumerable <GridVector> scanX(GridVector start, Vector2 dir, float dist)
{
float ratioYX = Mathf.Abs(dir.y / dir.x);
dist /= GRID_SIZE;
int distx = Mathf.CeilToInt(dist / Mathf.Sqrt(1 + ratioYX * ratioYX)); // dist = sqrt(distx^2 + (distx*ratioYX)^2)
int signx = (int)Mathf.Sign(dir.x);
int signy = (int)Mathf.Sign(dir.y);
for (int x = 0; x <= distx; ++x)
{
int y = Mathf.RoundToInt(x * ratioYX);
GridVector grid = new GridVector(start.x + x * signx, start.y + y * signy);
yield return(grid);
yield return(grid + GridVector.up);
yield return(grid + GridVector.down);
}
}