public static IEnumerable <(int x, int y, uint value)> GetValues(this HeatMap heatMap, ulong tileId, uint resolution = 256)
{
var(xTile, yTile, scaledResolution) = heatMap.GetTilePosition(tileId);
if (scaledResolution < resolution)
{
throw new NotSupportedException("Upscaling of heatmap not supported.");
}
if (scaledResolution > resolution)
{
var factor = scaledResolution / resolution;
for (var x = 0; x < resolution; x++)
{
for (var y = 0; y < resolution; y++)
{
var xScaled = x * factor;
var yScaled = y * factor;
var count = 0U;
for (var dx = 0; dx < factor; dx++)
{
for (var dy = 0; dy < factor; dy++)
{
count += heatMap[xTile + xScaled + dx, yTile + yScaled + dy];
}
}
if (count != 0)
{
yield return(x, y, count);
}
}
}
}
for (var x = 0; x < resolution; x++)
{
for (var y = 0; y < resolution; y++)
{
var count = heatMap[xTile + x, yTile + y];
if (count != 0)
{
yield return(x, y, count);
}
}
}
}
