public static IFastImage Render(LightMap lightMap, IEnumerable <LightDefinition> lights, int scale = 10)
{
var image = Render(lightMap, scale);
foreach (var light in lights)
{
image.SetPixel(light.Center.X, light.Center.Y, light.Height switch
{
LightHeight.Ceiling => SKColors.Orange,
LightHeight.Middle => SKColors.HotPink,
LightHeight.Floor => SKColors.Red,
_ => throw new Exception("Impossible")
});
public static IFastImage Render(LightMap lightMap, int scale = 10)
{
var image = new FastImage(lightMap.Size.Width, lightMap.Size.Height, scale);
for (int y = 0; y < lightMap.Size.Height; y++)
{
for (int x = 0; x < lightMap.Size.Width; x++)
{
var light = lightMap[x, y];
byte intensity = (byte)((((double)light + lightMap.Range.DarkLevels) / lightMap.Range.Total) * 256);
image.SetPixel(x, y, new SKColor(intensity, intensity, intensity));
}
}
return(image);
}
public static (LightMap FloorLight, LightMap CeilingLight) Trace(
Size dimensions,
Func <Position, bool> isPositionObscured,
LightRange lightRange,
IEnumerable <LightDefinition> lights)
{
var floorLight = new LightMap(lightRange, dimensions).Blackout();
var ceilingLight = new LightMap(lightRange, dimensions).Blackout();
foreach (var light in lights)
{
// Check a big square around the light. This is very brute force but it doesn't appear to cause any
// problems.
for (int y = 0; y < light.LengthAffected; y++)
{
for (int x = 0; x < light.LengthAffected; x++)
{
var delta = new PositionDelta(x, y) - light.Radius;
var location = light.Center + delta;
if (!dimensions.Contains(location))
{
continue;
}
// check for line of sight
var obscured =
DrawingUtil.BresenhamLine(
start: light.Center,
end: location)
.Any(isPositionObscured);
if (!obscured)
{
var(floorIncrement, ceilingIncrement) = light.GetBrightness(location);
floorLight.Lighten(location, floorIncrement);
ceilingLight.Lighten(location, ceilingIncrement);
}
}
}
}
return(floorLight, ceilingLight);
}
