protected virtual SKPicture OnSnapshot ()
{
var recorder = new SKPictureRecorder ();
var canvas = recorder.BeginRecording (Bounds);
Draw (canvas, 0, 0);
return recorder.EndRecording ();
}
private SKPicture Load(XDocument xdoc)
{
var svg = xdoc.Root;
var ns = svg.Name.Namespace;
// find the defs (gradients) - and follow all hrefs
foreach (var d in svg.Descendants())
{
var id = d.Attribute("id")?.Value?.Trim();
if (!string.IsNullOrEmpty(id))
{
defs[id] = ReadDefinition(d);
}
}
Version = svg.Attribute("version")?.Value;
Title = svg.Element(ns + "title")?.Value;
Description = svg.Element(ns + "desc")?.Value ?? svg.Element(ns + "description")?.Value;
if (CanvasSize.IsEmpty)
{
// get the dimensions
var widthA = svg.Attribute("width");
var heightA = svg.Attribute("height");
var width = ReadNumber(widthA);
var height = ReadNumber(heightA);
var size = new SKSize(width, height);
var viewBox = SKRect.Create(size);
var viewBoxA = svg.Attribute("viewBox") ?? svg.Attribute("viewPort");
if (viewBoxA != null)
{
viewBox = ReadRectangle(viewBoxA.Value);
}
if (widthA != null && widthA.Value.Contains("%"))
{
size.Width *= viewBox.Width;
}
if (heightA != null && heightA.Value.Contains("%"))
{
size.Height *= viewBox.Height;
}
// set the property
CanvasSize = size;
}
// create the picture from the elements
using (var recorder = new SKPictureRecorder())
using (var canvas = recorder.BeginRecording(SKRect.Create(CanvasSize)))
{
LoadElements(svg.Elements(), canvas);
Picture = recorder.EndRecording();
}
return(Picture);
}
private SKPicture Load(XDocument xdoc)
{
var svg = xdoc.Root;
var ns = svg.Name.Namespace;
// find the defs (gradients) - and follow all hrefs
foreach (var d in svg.Descendants())
{
var id = d.Attribute("id")?.Value?.Trim();
if (!string.IsNullOrEmpty(id))
{
defs[id] = ReadDefinition(d);
}
}
Version = svg.Attribute("version")?.Value;
Title = svg.Element(ns + "title")?.Value;
Description = svg.Element(ns + "desc")?.Value ?? svg.Element(ns + "description")?.Value;
// TODO: parse the "preserveAspectRatio" values properly
var preserveAspectRatio = svg.Attribute("preserveAspectRatio")?.Value;
// get the SVG dimensions
var viewBoxA = svg.Attribute("viewBox") ?? svg.Attribute("viewPort");
if (viewBoxA != null)
{
ViewBox = ReadRectangle(viewBoxA.Value);
}
else
{
var widthA = svg.Attribute("width");
var heightA = svg.Attribute("height");
var width = ReadNumber(widthA);
var height = ReadNumber(heightA);
var size = new SKSize(width, height);
ViewBox = SKRect.Create(size);
}
if (CanvasSize.IsEmpty)
{
// get the user dimensions
var widthA = svg.Attribute("width");
var heightA = svg.Attribute("height");
var width = ReadNumber(widthA);
var height = ReadNumber(heightA);
var size = new SKSize(width, height);
if (widthA == null)
{
size.Width = ViewBox.Width;
}
else if (widthA.Value.Contains("%"))
{
size.Width *= ViewBox.Width;
}
if (heightA == null)
{
size.Height = ViewBox.Height;
}
else if (heightA != null && heightA.Value.Contains("%"))
{
size.Height *= ViewBox.Height;
}
// set the property
CanvasSize = size;
}
// create the picture from the elements
using (var recorder = new SKPictureRecorder())
using (var canvas = recorder.BeginRecording(SKRect.Create(CanvasSize)))
{
// scale the SVG dimensions to fit inside the user dimensions
if (ViewBox.Width != CanvasSize.Width || ViewBox.Height != CanvasSize.Height)
{
if (preserveAspectRatio == "none")
{
canvas.Scale(CanvasSize.Width / ViewBox.Width, CanvasSize.Height / ViewBox.Height);
}
else
{
// TODO: just center scale for now
var scale = Math.Min(CanvasSize.Width / ViewBox.Width, CanvasSize.Height / ViewBox.Height);
var centered = SKRect.Create(CanvasSize).AspectFit(ViewBox.Size);
canvas.Translate(centered.Left, centered.Top);
canvas.Scale(scale, scale);
}
}
// translate the canvas by the viewBox origin
canvas.Translate(-ViewBox.Left, -ViewBox.Top);
LoadElements(svg.Elements(), canvas);
Picture = recorder.EndRecording();
}
return(Picture);
}
){kind=link}