/// <summary>
/// Gets a linear gradient definition.
/// </summary>
public static LinearGradientColor GetLinearGradientColor(StructureDescriptor descriptor)
{
var linearGradientColor = new LinearGradientColor();
linearGradientColor.GradientStops = new List <GradientColorStop>();
linearGradientColor.GradientStops = GetGradientColor(descriptor, linearGradientColor);
return(linearGradientColor);
}
/// <summary>
/// Get our intermediate linear gradient color definition from the given psd color definition
/// </summary>
private (GraphicLinearGradientBrush, GraphicColorPrecision) GetLinearGradientBrush(LinearGradientColor linearGradientColor, double aspectRatio, bool returnDarkDefaultColor)
{
var gradient = new GraphicLinearGradientBrush();
double angle = linearGradientColor.Angle;
if (linearGradientColor.IsReverse)
{
angle += 180;
if (angle > 180)
{
angle -= 360;
}
}
var scale = linearGradientColor.Scale / 100;
double angleFullAbs = Math.Abs(angle);
double x2;
double x1;
double y2;
double y1;
if (angle == 90)
{
x1 = 0.5;
x2 = 0.5;
y1 = 0.5 + scale * 0.5;
y2 = 0.5 - scale * 0.5;
}
else
if (angle == -90)
{
x1 = 0.5;
x2 = 0.5;
y1 = 0.5 - scale * 0.5;
y2 = 0.5 + scale * 0.5;
}
else
{
var angleAbs = angleFullAbs;
if (angleFullAbs > 90)
{
angleAbs = 180 - angleFullAbs;
}
double angleRad = angleAbs * Math.PI / 180.0;
var beta = Math.Atan(aspectRatio);
if (angleRad < beta)
{
var a = 0.5 * Math.Tan(angleRad) * scale;
if (angleFullAbs <= 90)
{
x1 = 0.5 - scale * 0.5;
x2 = 0.5 + scale * 0.5;
}
else
{
x1 = 0.5 + scale * 0.5;
x2 = 0.5 - scale * 0.5;
}
if (angle >= 0)
{
y1 = 0.5 + a / aspectRatio;
y2 = 0.5 - a / aspectRatio;
}
else
{
y1 = 0.5 - a / aspectRatio;
y2 = 0.5 + a / aspectRatio;
}
}
else
{
var a = 0.5 * Math.Tan(Math.PI / 2 - angleRad) * scale;
if (angleFullAbs <= 90)
{
x1 = 0.5 - a * aspectRatio;
x2 = 0.5 + a * aspectRatio;
}
else
{
x1 = 0.5 + a * aspectRatio;
x2 = 0.5 - a * aspectRatio;
}
if (angle >= 0)
{
y1 = 0.5 + scale * 0.5;
y2 = 0.5 - scale * 0.5;
}
else
{
y1 = 0.5 - scale * 0.5;
y2 = 0.5 + scale * 0.5;
}
}
}
gradient.StartPoint = new Point(x1, y1);
gradient.EndPoint = new Point(x2, y2);
gradient.GradientStops = new List <GraphicGradientStop>();
GraphicColorPrecision precision;
foreach (var stop in linearGradientColor.GradientStops)
{
var gs = new GraphicGradientStop();
gradient.GradientStops.Add(gs);
(gs.Color, precision) = GetColor(stop.Color, returnDarkDefaultColor);
gs.Position = stop.Position / linearGradientColor.MaxPosition;
}
return(gradient, GraphicColorPrecision.Estimated);
}
