/// <summary>
/// Gets the tile at position. This can be used to obtain tile data, etc
/// -1 = no data or empty tile
/// </summary>
public Color GetInterpolatedColorAtPosition(Vector3 position)
{
Vector3 localPosition = transform.worldToLocalMatrix.MultiplyPoint(position);
int x = (int)((localPosition.x - data.tileOrigin.x) / data.tileSize.x);
int y = (int)((localPosition.y - data.tileOrigin.y) / data.tileSize.y);
if (colorChannel == null || colorChannel.IsEmpty)
{
return(Color.white);
}
if (x < 0 || x >= width ||
y < 0 || y >= height)
{
return(colorChannel.clearColor);
}
int offset;
ColorChunk colorChunk = colorChannel.FindChunkAndCoordinate(x, y, out offset);
if (colorChunk.Empty)
{
return(colorChannel.clearColor);
}
else
{
int colorChunkRowOffset = partitionSizeX + 1;
Color tileColorx0y0 = colorChunk.colors[offset];
Color tileColorx1y0 = colorChunk.colors[offset + 1];
Color tileColorx0y1 = colorChunk.colors[offset + colorChunkRowOffset];
Color tileColorx1y1 = colorChunk.colors[offset + colorChunkRowOffset + 1];
float wx = x * data.tileSize.x + data.tileOrigin.x;
float wy = y * data.tileSize.y + data.tileOrigin.y;
float ix = (localPosition.x - wx) / data.tileSize.x;
float iy = (localPosition.y - wy) / data.tileSize.y;
Color cy0 = Color.Lerp(tileColorx0y0, tileColorx1y0, ix);
Color cy1 = Color.Lerp(tileColorx0y1, tileColorx1y1, ix);
return(Color.Lerp(cy0, cy1, iy));
}
}