protected override RequestedAction RenderEffects(ImageState s)
{
if (base.RenderEffects(s) == RequestedAction.Cancel)
{
return(RequestedAction.Cancel); //Call extensions
}
if (s.destGraphics == null)
{
return(RequestedAction.None);
}
//parse shadow
Color shadowColor = ParseUtils.ParseColor(s.settings["shadowColor"], Color.Transparent);
int shadowWidth = s.settings.Get <int>("shadowWidth", -1);
//Skip on transparent or 0-width shadow
if (shadowColor == Color.Transparent || shadowWidth <= 0)
{
return(RequestedAction.None);
}
using (Brush b = new SolidBrush(shadowColor)) {
//Offsets may show inside the shadow - so we have to fix that
s.destGraphics.FillPolygon(b,
PolygonMath.InflatePoly(s.layout["shadowInner"], 1)); //Inflate 1 for FillPolygon rounding errors.
}
//Then we can draw the outer gradient
DrawOuterGradient(s.destGraphics, s.layout["shadowInner"],
shadowColor, Color.Transparent, shadowWidth);
return(RequestedAction.None);
}
protected override RequestedAction LayoutEffects(ImageState s)
{
float shadowWidth = s.settings.Get <float>("shadowWidth", 0);
if (shadowWidth != 0)
{
var offset = s.settings.GetList <float>("shadowOffset", 0, 2);
PointF shadowOffset = offset == null ? new PointF(0, 0) : new PointF(offset[0], offset[1]);
//Clone last ring, then offset it - provides the inner bounds of the shadow later
s.layout.AddInvisiblePolygon("shadowInner", PolygonMath.MovePoly(s.layout.LastRing.points, shadowOffset));
//Determine the outer bound of the shadow
s.layout.AddRing("shadow", PolygonMath.InflatePoly(s.layout.LastRing.points, new float[] {
Math.Max(0, shadowWidth - shadowOffset.Y),
Math.Max(0, shadowWidth + shadowOffset.X),
Math.Max(0, shadowWidth + shadowOffset.Y),
Math.Max(0, shadowWidth - shadowOffset.X)
}));
}
return(RequestedAction.None);
}
/// <summary>
/// Inflates the last ring using the specified padding options. Returns the resulting ring object
/// </summary>
/// <param name="name"></param>
/// <param name="padding"></param>
/// <returns></returns>
public PointSet AddRing(string name, BoxPadding padding)
{
return(AddRing(name, PolygonMath.InflatePoly(LastRing.points, padding.GetEdgeOffsets())));
}