/// <summary>
/// Gets a linear gradient definition.
/// </summary>
public static RadialGradientColor GetRadialGradientColor(StructureDescriptor descriptor)
{
var radialGradientColor = new RadialGradientColor();
radialGradientColor.GradientStops = GetGradientColor(descriptor, radialGradientColor);
return(radialGradientColor);
}
/// <summary>
/// Get our intermediate radial gradient color definition from the given psd color definition
/// </summary>
private (GraphicRadialGradientBrush, GraphicColorPrecision) GetRadialGradientBrush(RadialGradientColor radialGradientColor, double aspectRatio, bool returnDarkDefaultColor)
{
var gradient = new GraphicRadialGradientBrush();
gradient.StartPoint = new Point(0.5, 0.5);
gradient.EndPoint = new Point(0.5, 0.5);
var alpha = Math.Abs(radialGradientColor.Angle) % 90;
double angleRad = alpha * Math.PI / 180.0;
var beta = Math.Atan(aspectRatio);
if (angleRad < beta)
{
var radius = 0.5 / Math.Cos(angleRad);
gradient.RadiusX = radius;
gradient.RadiusY = radius / aspectRatio;
}
else
{
var radius = 0.5 / Math.Cos(Math.PI / 2 - angleRad);
gradient.RadiusY = radius;
gradient.RadiusX = radius * aspectRatio;
}
gradient.GradientStops = new List <GraphicGradientStop>();
GraphicColorPrecision precision;
var scale = radialGradientColor.Scale / 100;
foreach (var stop in radialGradientColor.GradientStops)
{
var gs = new GraphicGradientStop();
gradient.GradientStops.Add(gs);
(gs.Color, precision) = GetColor(stop.Color, returnDarkDefaultColor);
gs.Position = stop.Position / radialGradientColor.MaxPosition;
if (radialGradientColor.IsReverse)
{
gs.Position = 1 - gs.Position;
}
if (radialGradientColor.Scale != 100)
{
gs.Position *= scale;
}
}
return(gradient, GraphicColorPrecision.Estimated);
}
