public static void DrawLine(this ICanvas canvas, double x1, double y1, double x2, double y2, Color color, double width = 1.0)
{
var p = new Path { Pen = new Pen (color, width) };
p.MoveTo (x1, y1);
p.LineTo (x2, y2);
p.Draw (canvas);
}
public static void DrawLine(this ICanvas canvas, Point start, Point end, Color color, double width = 1.0)
{
var p = new Path { Pen = new Pen (color, width) };
p.MoveTo (start);
p.LineTo (end);
p.Draw (canvas);
}
public static void DrawLine(this ICanvas canvas, Point start, Point end, Pen pen)
{
var p = new Path { Pen = pen };
p.MoveTo (start);
p.LineTo (end);
p.Draw (canvas);
}
public override Element TransformGeometry (Transform transform)
{
var p = new Path ();
base.SetCloneData (p);
p.Transform = Transform.Identity;
p.MoveTo (frame.TopLeft);
p.LineTo (frame.BottomLeft);
p.LineTo (frame.BottomRight);
p.LineTo (frame.TopRight);
p.Close ();
var tp = p.TransformGeometry (transform * Transform);
return tp;
}
void AddElement (IList<Element> list, XElement e, Pen inheritPen, Brush inheritBrush)
{
//
// Style
//
Element r = null;
Style eStyle = new Style();
ApplyStyle (e.Attributes ().ToDictionary (k => k.Name.LocalName, v => v.Value), eStyle);
var style = ReadString (e.Attribute ("style"));
if (!string.IsNullOrWhiteSpace (style)) {
ApplyStyle (style, eStyle);
}
if (!eStyle.hasPen) eStyle.pen = inheritPen;
if (!eStyle.hasBrush) eStyle.brush = inheritBrush;
//var id = ReadString (e.Attribute ("id"));
//
// Elements
//
switch (e.Name.LocalName) {
case "text":
{
var x = ReadNumber (e.Attribute ("x"));
var y = ReadNumber (e.Attribute ("y"));
var font = new Font ();
var fontFamily = ReadTextFontFamily(e);
if (!string.IsNullOrEmpty(fontFamily))
font.Family = fontFamily;
var fontSize = ReadTextFontSize(e);
if (fontSize >= 0)
font.Size = fontSize;
TextAlignment textAlignment = ReadTextAlignment(e);
var txt = new Text (new Rect (new Point (x, y), new Size (double.MaxValue, double.MaxValue)), font, textAlignment, eStyle.pen, eStyle.brush);
ReadTextSpans (txt, e);
r = txt;
}
break;
case "rect":
{
var x = ReadNumber (e.Attribute ("x"));
var y = ReadNumber (e.Attribute ("y"));
var width = ReadNumber (e.Attribute ("width"));
var height = ReadNumber (e.Attribute ("height"));
var rx = ReadNumber (e.Attribute ("rx"));
var ry = ReadNumber (e.Attribute ("ry"));
if (ry == 0) {
ry = rx;
}
r = new Rectangle (new Rect (new Point (x, y), new Size (width, height)), new Size (rx, ry), eStyle.pen, eStyle.brush);
}
break;
case "ellipse":
{
var cx = ReadNumber (e.Attribute ("cx"));
var cy = ReadNumber (e.Attribute ("cy"));
var rx = ReadNumber (e.Attribute ("rx"));
var ry = ReadNumber (e.Attribute ("ry"));
r = new Ellipse (new Point (cx - rx, cy - ry), new Size (2 * rx, 2 * ry), eStyle.pen, eStyle.brush);
}
break;
case "circle":
{
var cx = ReadNumber (e.Attribute ("cx"));
var cy = ReadNumber (e.Attribute ("cy"));
var rr = ReadNumber (e.Attribute ("r"));
r = new Ellipse (new Point (cx - rr, cy - rr), new Size (2 * rr, 2 * rr), eStyle.pen, eStyle.brush);
}
break;
case "path":
{
var dA = e.Attribute ("d");
if (dA != null && !string.IsNullOrWhiteSpace (dA.Value)) {
var p = new Path (eStyle.pen, eStyle.brush);
ReadPath (p, dA.Value);
r = p;
}
}
break;
case "polygon":
{
var pA = e.Attribute ("points");
if (pA != null && !string.IsNullOrWhiteSpace (pA.Value)) {
var path = new Path (eStyle.pen, eStyle.brush);
ReadPoints (path, pA.Value, true);
r = path;
}
}
break;
case "polyline":
{
var pA = e.Attribute ("points");
if (pA != null && !string.IsNullOrWhiteSpace (pA.Value)) {
var path = new Path (eStyle.pen, eStyle.brush);
ReadPoints (path, pA.Value, false);
r = path;
}
}
break;
case "g":
{
var g = new Group ();
var groupId = e.Attribute("id");
if (groupId != null && !string.IsNullOrEmpty(groupId.Value))
g.Id = groupId.Value;
AddElements (g.Children, e.Elements (), eStyle.pen, eStyle.brush);
r = g;
}
break;
case "use":
{
var href = ReadString (e.Attributes ().FirstOrDefault (x => x.Name.LocalName == "href"));
if (!string.IsNullOrWhiteSpace (href)) {
XElement useE;
if (defs.TryGetValue (href.Trim ().Replace ("#", ""), out useE)) {
var useList = new List<Element> ();
AddElement (useList, useE, eStyle.pen, eStyle.brush);
r = useList.FirstOrDefault ();
}
}
}
break;
case "title":
Graphic.Title = ReadString (e);
break;
case "desc":
case "description":
Graphic.Description = ReadString (e);
break;
case "defs":
// Already read in earlier pass
break;
case "namedview":
case "metadata":
case "image":
// Ignore
break;
case "line":
{
var x1 = ReadNumber ( e.Attribute("x1") );
var x2 = ReadNumber ( e.Attribute("x2") );
var y1 = ReadNumber ( e.Attribute("y1") );
var y2 = ReadNumber ( e.Attribute("y2") );
var p = new Path (eStyle.pen, null);
p.MoveTo (x1, y1);
p.LineTo (x2, y2);
r = p;
}
break;
case "foreignObject":
{
var x = ReadNumber ( e.Attribute("x") );
var y = ReadNumber ( e.Attribute("y") );
var width = ReadNumber ( e.Attribute("width") );
var height = ReadNumber ( e.Attribute("height") );
r = new ForeignObject(new Point(x, y), new Size(width, height));
}
break;
case "pgf":
{
var id = e.Attribute("id");
System.Diagnostics.Debug.WriteLine("Ignoring pgf element" + (id != null ? ": '" + id.Value + "'" : ""));
}
break;
case "switch":
{
// Evaluate requiredFeatures, requiredExtensions and systemLanguage
foreach (var ee in e.Elements())
{
var requiredFeatures = ee.Attribute("requiredFeatures");
var requiredExtensions = ee.Attribute("requiredExtensions");
var systemLanguage = ee.Attribute("systemLanguage");
// currently no support for any of these restrictions
if (requiredFeatures == null && requiredExtensions == null && systemLanguage == null)
AddElement (list, ee, eStyle.pen, eStyle.brush);
}
}
break;
// color definition that can be referred to by other elements
case "linearGradient":
break;
default:
throw new NotSupportedException ("SVG element \"" + e.Name.LocalName + "\" is not supported");
}
if (r != null) {
eStyle.Apply(r);
r.Transform = ReadTransform (ReadString (e.Attribute ("transform")));
var ida = e.Attribute("id");
if (ida != null && !string.IsNullOrEmpty (ida.Value)) {
r.Id = ida.Value.Trim ();
}
list.Add (r);
}
}
void ReadPoints (Path p, string pathDescriptor, bool closePath)
{
var args = pathDescriptor.Split (new[]{' '}, StringSplitOptions.RemoveEmptyEntries);
var i = 0;
var n = args.Length;
if (n == 0)
throw new Exception ("No points specified");
while (i < n) {
var xy = args[i].Split(new[]{','}, StringSplitOptions.RemoveEmptyEntries);
var x = 0.0;
var y = 0.0;
var di = 1;
if (xy.Length == 1) {
x = ReadNumber (args [i]);
y = ReadNumber (args [i + 1]);
di = 2;
}
else {
x = ReadNumber (xy[0]);
y = ReadNumber (xy[1]);
}
if (i == 0) {
p.MoveTo (x, y);
} else {
p.LineTo (x, y);
}
i += di;
}
if (closePath)
p.Close ();
}
void ReadPath (Path p, string pathDescriptor)
{
Match m = pathRegex.Match(pathDescriptor);
while(m.Success)
{
var match = m.Value.TrimStart ();
var op = match[0];
if (op == 'z' || op == 'Z') {
p.Close ();
} else {
// make sure negative numbers are split properly
match = negativeNumberRe.Replace(match.Substring(1), " -");
var args = match.Split(WSC, StringSplitOptions.RemoveEmptyEntries);
Point previousPoint = new Point ();
int index = 0;
while(index < args.Length)
{
if (p.Operations.Count > 0 && !(p.Operations.Last() is ClosePath))
previousPoint = p.Operations.Last().EndPoint;
if ((op == 'M' || op == 'm') && args.Length >= index+2) {
var point = new Point (ReadNumber (args [index]), ReadNumber (args [index+1]));
if (op == 'm')
point += previousPoint;
p.MoveTo (point);
index += 2;
} else if ((op == 'L' || op == 'l') && args.Length >= index+2) {
var point = new Point (ReadNumber (args [index]), ReadNumber (args [index+1]));
if (op == 'l')
point += previousPoint;
p.LineTo (point);
index += 2;
} else if ((op == 'C' || op == 'c') && args.Length >= index+6) {
var c1 = new Point (ReadNumber (args [index]), ReadNumber (args [index+1]));
var c2 = new Point (ReadNumber (args [index+2]), ReadNumber (args [index+3]));
var pt = new Point (ReadNumber (args [index+4]), ReadNumber (args [index+5]));
if (op == 'c')
{
c1 += previousPoint;
c2 += previousPoint;
pt += previousPoint;
}
p.CurveTo (c1, c2, pt);
index += 6;
} else if ((op == 'S' || op == 's') && args.Length >= index+4) {
var c = new Point (ReadNumber (args [index]), ReadNumber (args [index+1]));
var pt = new Point (ReadNumber (args [index+2]), ReadNumber (args [index+3]));
if (op == 's')
{
c += previousPoint;
pt += previousPoint;
}
p.ContinueCurveTo (c, pt);
index += 4;
} else if ((op == 'A' || op == 'a') && args.Length >= index+7) {
var r = new Size (ReadNumber (args [index]), ReadNumber (args [index+1]));
// var xr = ReadNumber (args [i + 2]);
var laf = ReadNumber (args [index+3]) != 0;
var swf = ReadNumber (args [index+4]) != 0;
var pt = new Point (ReadNumber (args [index+5]), ReadNumber (args [index+6]));
if (op == 'a')
pt += previousPoint;
p.ArcTo (r, laf, swf, pt);
index += 7;
} else if ((op == 'V' || op == 'v') && args.Length >= index+1 && p.Operations.Count > 0) {
var previousX = previousPoint.X;
var y = ReadNumber(args[index]);
if (op == 'v')
y += previousPoint.Y;
var point = new Point(previousX, y);
p.LineTo(point);
index += 1;
} else if ((op == 'H' || op == 'h') && args.Length >= index+1 && p.Operations.Count > 0) {
var previousY = previousPoint.Y;
var x = ReadNumber(args[index]);
if (op == 'h')
x += previousPoint.X;
var point = new Point(x, previousY);
p.LineTo(point);
index += 1;
} else {
throw new NotSupportedException ("Path Operation " + op);
}
}
}
m = m.NextMatch();
}
}
void ReadPoints(Path p, string pathDescriptor, bool closePath)
{
var args = pathDescriptor.Split (new[]{' '}, StringSplitOptions.RemoveEmptyEntries);
var i = 0;
var n = args.Length;
if (n == 0)
throw new Exception ("Not supported point");
while (i < n) {
var xy = args[i].Split(new[]{','}, StringSplitOptions.RemoveEmptyEntries);
var x = ReadNumber (xy[0]);
var y = ReadNumber (xy[1]);
if (i == 0) {
p.MoveTo (x, y);
} else
p.LineTo (x, y);
i++;
}
if (closePath)
p.Close ();
}
void ReadPath(Path p, string pathDescriptor)
{
Match m = pathRegex.Match(pathDescriptor);
while(m.Success)
{
var match = m.Value.Trim();
var op = match.Substring(0, 1);
// make sure negative numbers are split properly
match = match.Replace("-", " -");
var args = match.Substring(1).Split(WSC, StringSplitOptions.RemoveEmptyEntries);
Point previousPoint = new Point ();
if (p.Operations.Count > 0 && !(p.Operations.Last() is ClosePath))
previousPoint = p.Operations.Last().EndPoint;
if ((op == "M" || op == "m") && args.Length >= 2) {
var point = new Point (ReadNumber (args [0]), ReadNumber (args [1]));
if (op == "m")
point += previousPoint;
p.MoveTo (point);
} else if ((op == "L" || op == "l") && args.Length >= 2) {
var point = new Point (ReadNumber (args [0]), ReadNumber (args [1]));
if (op == "l")
point += previousPoint;
p.LineTo (point);
} else if ((op == "C" || op == "c") && args.Length >= 6) {
var c1 = new Point (ReadNumber (args [0]), ReadNumber (args [1]));
var c2 = new Point (ReadNumber (args [2]), ReadNumber (args [3]));
var pt = new Point (ReadNumber (args [4]), ReadNumber (args [5]));
if (op == "c")
{
c1 += previousPoint;
c2 += previousPoint;
pt += previousPoint;
}
p.CurveTo (c1, c2, pt);
} else if ((op == "S" || op == "s") && args.Length >= 4) {
var c = new Point (ReadNumber (args [0]), ReadNumber (args [1]));
var pt = new Point (ReadNumber (args [2]), ReadNumber (args [3]));
if (op == "s")
{
c += previousPoint;
pt += previousPoint;
}
p.ContinueCurveTo (c, pt);
} else if ((op == "A" || op == "a") && args.Length >= 7) {
var r = new Size (ReadNumber (args [0]), ReadNumber (args [1]));
// var xr = ReadNumber (args [i + 2]);
var laf = ReadNumber (args [3]) != 0;
var swf = ReadNumber (args [4]) != 0;
var pt = new Point (ReadNumber (args [5]), ReadNumber (args [6]));
if (op == "a")
pt += previousPoint;
p.ArcTo (r, laf, swf, pt);
} else if ((op == "V" || op == "v") && args.Length >= 1 && p.Operations.Count > 0) {
var previousX = previousPoint.X;
var y = ReadNumber(args[0]);
if (op == "v")
y += previousPoint.Y;
var point = new Point(previousX, y);
p.LineTo(point);
} else if ((op == "H" || op == "h") && args.Length >= 1 && p.Operations.Count > 0) {
var previousY = previousPoint.Y;
var x = ReadNumber(args[0]);
if (op == "h")
x += previousPoint.X;
var point = new Point(x, previousY);
p.LineTo(point);
} else if (op == "z" || op == "Z") {
p.Close ();
} else {
throw new NotSupportedException ("Path Operation " + op);
}
m = m.NextMatch();
}
}
void ReadPolygon(Path p, string pathDescriptor)
{
var args = pathDescriptor.Split (new[]{' '}, StringSplitOptions.RemoveEmptyEntries);
var i = 0;
var n = args.Length;
if (n == 0)
throw new Exception ("Not supported polygon");
while (i < n) {
var x = ReadNumber (args [i]);
var y = ReadNumber (args [i + 1]);
if (i == 0) {
p.MoveTo (x, y);
} else
p.LineTo (x, y);
i += 2;
}
p.Close ();
}
void AddElement(IList<IDrawable> list, XElement e, Pen inheritPen, Brush inheritBrush)
{
//
// Style
//
Element r = null;
Pen pen = null;
Brush brush = null;
bool hasPen, hasBrush;
ApplyStyle (e.Attributes ().ToDictionary (k => k.Name.LocalName, v => v.Value), ref pen, out hasPen, ref brush, out hasBrush);
var style = ReadString (e.Attribute ("style"));
if (!string.IsNullOrWhiteSpace (style)) {
ApplyStyle (style, ref pen, out hasPen, ref brush, out hasBrush);
}
pen = hasPen ? pen : inheritPen;
brush = hasBrush ? brush : inheritBrush;
//var id = ReadString (e.Attribute ("id"));
//
// Elements
//
switch (e.Name.LocalName) {
case "text":
{
var x = ReadNumber (e.Attribute ("x"));
var y = ReadNumber (e.Attribute ("y"));
var text = e.Value.Trim ();
var fontFamilyAttribute = e.Attribute("font-family");
var font = new Font ();
//if (fontFamilyAttribute != null)
// font.Family = fontFamilyAttribute.Value.Trim('\'');
var fontSizeAttribute = e.Attribute("font-size");
if (fontSizeAttribute != null)
font.Size = ReadNumber(fontSizeAttribute.Value);
r = new Text (text, new Rect (new Point (x, y), new Size (double.MaxValue, double.MaxValue)), font, TextAlignment.Left, pen, brush);
}
break;
case "rect":
{
var x = ReadNumber (e.Attribute ("x"));
var y = ReadNumber (e.Attribute ("y"));
var width = ReadNumber (e.Attribute ("width"));
var height = ReadNumber (e.Attribute ("height"));
r = new Rectangle (new Point (x, y), new Size (width, height), pen, brush);
}
break;
case "ellipse":
{
var cx = ReadNumber (e.Attribute ("cx"));
var cy = ReadNumber (e.Attribute ("cy"));
var rx = ReadNumber (e.Attribute ("rx"));
var ry = ReadNumber (e.Attribute ("ry"));
r = new Ellipse (new Point (cx - rx, cy - ry), new Size (2 * rx, 2 * ry), pen, brush);
}
break;
case "circle":
{
var cx = ReadNumber (e.Attribute ("cx"));
var cy = ReadNumber (e.Attribute ("cy"));
var rr = ReadNumber (e.Attribute ("r"));
r = new Ellipse (new Point (cx - rr, cy - rr), new Size (2 * rr, 2 * rr), pen, brush);
}
break;
case "path":
{
var dA = e.Attribute ("d");
if (dA != null && !string.IsNullOrWhiteSpace (dA.Value)) {
var p = new Path (pen, brush);
ReadPath (p, dA.Value);
r = p;
}
}
break;
case "polygon":
{
var pA = e.Attribute ("points");
if (pA != null && !string.IsNullOrWhiteSpace (pA.Value)) {
var path = new Path (pen, brush);
ReadPolygon (path, pA.Value);
r = path;
}
}
break;
case "g":
{
var g = new Group ();
AddElements (g.Children, e.Elements (), pen, brush);
r = g;
}
break;
case "use":
{
var href = ReadString (e.Attributes ().FirstOrDefault (x => x.Name.LocalName == "href"));
if (!string.IsNullOrWhiteSpace (href)) {
XElement useE;
if (defs.TryGetValue (href.Trim ().Replace ("#", ""), out useE)) {
var useList = new List<IDrawable> ();
AddElement (useList, useE, pen, brush);
r = useList.OfType<Element> ().FirstOrDefault ();
}
}
}
break;
case "title":
Graphic.Title = ReadString (e);
break;
case "desc":
case "description":
Graphic.Description = ReadString (e);
break;
case "defs":
// Already read in earlier pass
break;
case "namedview":
case "metadata":
case "image":
// Ignore
break;
case "line":
{
var x1 = ReadNumber ( e.Attribute("x1") );
var x2 = ReadNumber ( e.Attribute("x2") );
var y1 = ReadNumber ( e.Attribute("y1") );
var y2 = ReadNumber ( e.Attribute("y2") );
r = new Line(new Point(x1, y1), new Point(x2, y2), pen);
}
break;
// color definition that can be referred to by other elements
case "linearGradient":
break;
default:
throw new NotSupportedException ("SVG element \"" + e.Name.LocalName + "\" is not supported");
}
if (r != null) {
r.Transform = ReadTransform (ReadString (e.Attribute ("transform")));
list.Add (r);
}
}
void ReadPath(Path p, string pathDescriptor)
{
var args = pathDescriptor.Split (WSC, StringSplitOptions.RemoveEmptyEntries);
var i = 0;
var n = args.Length;
while (i < n) {
var a = args[i];
//
// Get the operation
//
var op = "";
if (a.Length == 1) {
op = a;
i++;
} else {
op = a.Substring (0, 1);
args [i] = a.Substring (1);
}
//
// Execute
//
if (op == "M" && i + 1 < n) {
p.MoveTo (new Point (ReadNumber (args [i]), ReadNumber (args [i + 1])));
i += 2;
} else if (op == "L" && i + 1 < n) {
p.LineTo (new Point (ReadNumber (args [i]), ReadNumber (args [i + 1])));
i += 2;
} else if (op == "C" && i + 5 < n) {
var c1 = new Point (ReadNumber (args [i]), ReadNumber (args [i + 1]));
var c2 = new Point (ReadNumber (args [i + 2]), ReadNumber (args [i + 3]));
var pt = new Point (ReadNumber (args [i + 4]), ReadNumber (args [i + 5]));
p.CurveTo (c1, c2, pt);
i += 6;
} else if (op == "S" && i + 3 < n) {
var c = new Point (ReadNumber (args [i]), ReadNumber (args [i + 1]));
var pt = new Point (ReadNumber (args [i + 2]), ReadNumber (args [i + 3]));
p.ContinueCurveTo (c, pt);
i += 4;
} else if (op == "A" && i + 6 < n) {
var r = new Size (ReadNumber (args [i]), ReadNumber (args [i + 1]));
// var xr = ReadNumber (args [i + 2]);
var laf = ReadNumber (args [i + 3]) != 0;
var swf = ReadNumber (args [i + 4]) != 0;
var pt = new Point (ReadNumber (args [i + 5]), ReadNumber (args [i + 6]));
p.ArcTo (r, laf, swf, pt);
i += 7;
} else if (op == "z" || op == "Z") {
p.Close ();
} else {
throw new NotSupportedException ("Path Operation " + op);
}
}
}
public static void DrawPath(this ICanvas canvas, Action<Path> draw, Pen pen = null, Brush brush = null)
{
var p = new Path (pen, brush);
draw (p);
p.Draw (canvas);
}
public static void FillPath(this ICanvas canvas, Action<Path> draw, Brush brush)
{
var p = new Path (null, brush);
draw (p);
p.Draw (canvas);
}
public virtual void EndVisit (Path path)
{
EndVisitElement (path);
}
