/// <summary>
/// Convert an absolute position in the same coordinate space as the
/// given rectangle to a relative position within the bound of the given rectangle
/// </summary>
private Point GetRelativePosition(EpsRect rect, Point absPosition)
{
var x = (absPosition.X - rect.Left) / (rect.Right - rect.Left);
var y = (absPosition.Y - rect.Top) / (rect.Bottom - rect.Top);
return(new Point(x, y));
}
/// <summary>
/// Get a brush
/// </summary>
public GraphicBrush GetBrush(Matrix matrix, EpsRect boundingBox)
{
var stops = function.GetBoundaryValues();
var linearGradientBrush = new GraphicLinearGradientBrush();
// The whole logic of the shape converter is able to handle both relative and
// absolute coordinates of gradients. WPF also allows both mapping modes. But
// there is one single case where absolute coordinates don't work: in a <Path/>
// object when the stretch mode is other than None. Such a path isn't really
// helpfull. That's why all parsers generate relative coordinates.
#if GENERATE_RELATIVE_COORDINATES
var p0 = coords0 * matrix;
linearGradientBrush.StartPoint = GetRelativePosition(boundingBox, p0);
var p1 = coords1 * matrix;
linearGradientBrush.EndPoint = GetRelativePosition(boundingBox, p1);
#else
linearGradientBrush.MappingMode = BrushMappingMode.Absolute;
var p0 = coords0 * matrix;
linearGradientBrush.StartPoint = p0;
var p1 = coords1 * matrix;
linearGradientBrush.EndPoint = p1;
#endif
linearGradientBrush.GradientStops = new List <GraphicGradientStop>();
for (int i = 0; i < stops.Count; i++)
{
var stop = stops[i];
var graphicGradientStop = new GraphicGradientStop();
linearGradientBrush.GradientStops.Add(graphicGradientStop);
var color = colorSpace.GetColor(stop.Value);
graphicGradientStop.Color = color;
graphicGradientStop.Position = stop.Stop;
}
return(linearGradientBrush);
}
/// <summary>
/// Get a brush
/// </summary>
public GraphicBrush GetBrush(Matrix matrix, EpsRect rect)
{
var linear = new GraphicLinearGradientBrush();
linear.StartPoint = new System.Windows.Point(0, 0);
linear.EndPoint = new System.Windows.Point(1, 1);
linear.GradientStops = new List <GraphicGradientStop>();
var stop = new GraphicGradientStop();
linear.GradientStops.Add(stop);
stop.Color = Colors.Yellow;
stop.Position = 0;
stop = new GraphicGradientStop();
linear.GradientStops.Add(stop);
stop.Color = Colors.Salmon;
stop.Position = 1;
return(linear);
}
/// <summary>
/// Get a brush
/// </summary>
public GraphicBrush GetBrush(Matrix matrix, EpsRect boundingBox)
{
var stops = function.GetBoundaryValues();
var linearGradientBrush = new GraphicRadialGradientBrush();
// see comment in LinearGradientShading.cs in GetBrush for more details
#if GENERATE_RELATIVE_COORDINATES
// calculate the start position relative to the object rectangle
var center0UserSpace = center0 * matrix;
linearGradientBrush.StartPoint = GetRelativePosition(boundingBox, center0UserSpace);
// calculate the end position relative to the object rectangle
var center1UserSpace = center1 * matrix;
linearGradientBrush.EndPoint = GetRelativePosition(boundingBox, center1UserSpace);
// get the center point and a point on the outer ring
// in user space coordinates
var centerPointUserSpace = new Point(0, 0) * matrix;
var outerPointUserSpace = new Point(1, 1) * matrix;
// get the radii in user space
var gradientRadiusXUserSpace = Math.Abs(outerPointUserSpace.X - centerPointUserSpace.X);
var gradientRadiusYUserSpace = Math.Abs(outerPointUserSpace.Y - centerPointUserSpace.Y);
// get the object's size in the user space, we need the radii relative to this size
var objectWidth = Math.Abs(boundingBox.Right - boundingBox.Left);
var objectHeight = Math.Abs(boundingBox.Bottom - boundingBox.Top);
// calculate the relative radius X
var relativeRadiusX = gradientRadiusXUserSpace / objectWidth;
linearGradientBrush.RadiusX = radius1 * relativeRadiusX;
// calculate the relative radius Y
var relativeRadiusY = gradientRadiusYUserSpace / objectHeight;
linearGradientBrush.RadiusY = radius1 * relativeRadiusY;
#else
linearGradientBrush.MappingMode = BrushMappingMode.Absolute;
// calculate the start position relative to the object rectangle
var center0UserSpace = center0 * matrix;
linearGradientBrush.StartPoint = center0UserSpace;
// calculate the end position relative to the object rectangle
var center1UserSpace = center1 * matrix;
linearGradientBrush.EndPoint = center1UserSpace;
// calculate the radius X
linearGradientBrush.RadiusX = TransformX(radius1, matrix);
// calculate the radius Y
linearGradientBrush.RadiusY = TransformY(radius1, matrix);
#endif
linearGradientBrush.GradientStops = new List <GraphicGradientStop>();
if (stops.Count > 0 && !DoubleUtilities.IsZero(stops[0].Stop) && !DoubleUtilities.IsZero(radius0))
{
var graphicGradientStop = new GraphicGradientStop();
linearGradientBrush.GradientStops.Add(graphicGradientStop);
graphicGradientStop.Color = Colors.Transparent;
graphicGradientStop.Position = 0;
graphicGradientStop = new GraphicGradientStop();
linearGradientBrush.GradientStops.Add(graphicGradientStop);
graphicGradientStop.Color = Colors.Transparent;
graphicGradientStop.Position = stops[0].Stop;
}
for (int i = 0; i < stops.Count; i++)
{
var stop = stops[i];
var graphicGradientStop = new GraphicGradientStop();
linearGradientBrush.GradientStops.Add(graphicGradientStop);
var color = colorSpace.GetColor(stop.Value);
graphicGradientStop.Color = color;
graphicGradientStop.Position = stop.Stop;
}
return(linearGradientBrush);
}
/// <summary>
/// Get a brush
/// </summary>
public GraphicBrush GetBrush(Matrix parentMatrix, EpsRect rect)
{
return(shading.GetBrush(matrix * parentMatrix, rect));
}
