public static double GetBrightness(this GsColor c)
{
return(Math.Sqrt(
c.R * c.R * .241 +
c.G * c.G * .691 +
c.B * c.B * .068));
}
public static GsColor LightOrDark(this GsColor color)
{
double bright = color.GetBrightness();
if (bright < 130)
{
return(color.Lighten());
}
else
{
return(color.Darken());
}
}
public static GsColor Interpolate(GsColor c1, GsColor c2, float amount, Func <float, float, float, float> op)
{
// start colours as lerp-able floats
float sr = c1.R, sg = c1.G, sb = c1.B;
// end colours as lerp-able floats
float er = c2.R, eg = c2.G, eb = c2.B;
// lerp the colours to get the difference
byte r = (byte)op(sr, er, amount),
g = (byte)op(sg, eg, amount),
b = (byte)op(sb, eb, amount);
// return the new colour
return(new GsColor(r, g, b));
}
public static GsColor SmoothStep(GsColor c1, GsColor c2, float amount)
{
return(Interpolate(c1, c2, amount, SmoothStep));
}
public static GsColor Lerp(GsColor c1, GsColor c2, float amount)
{
return(Interpolate(c1, c2, amount, Lerp));
}
public static GsColor Darken(this GsColor color, float amt = 0.5f)
{
return(GsMath.Lerp(color, GsColor.Black, amt));
}
public static GsColor Lighten(this GsColor color, float amt = 0.5f)
{
return(GsMath.Lerp(color, GsColor.White, amt));
}
public GsColor(GsColor rgb, byte a)
: this(a, rgb.R, rgb.G, rgb.B)
{
}
public static void FillRectangle(this IGsGraphics graphics, GsColor color, GsRectangle rect)
{
graphics.FillRectangle(color, rect.X, rect.Y, rect.Width, rect.Height);
}
public static void DrawString(this IGsGraphics graphics, GsFont font, string text, float x, float y, float width, float height, GsColor color, GsAlignment alignment)
{
var size = GsTextMeasurer.MeasureString(font, text);
var pos = CalculatePosition(size, x, y, width, height, alignment);
graphics.DrawString(font, text, pos.X, pos.Y, color);
}