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SvgPathBuilder.cs
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SvgPathBuilder.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Threading;
using Svg.Pathing;
namespace Svg
{
public static class PointFExtensions
{
public static string ToSvgString(this PointF p)
{
return p.X.ToString(CultureInfo.InvariantCulture) + " " + p.Y.ToString(CultureInfo.InvariantCulture);
}
}
public class SvgPathBuilder : TypeConverter
{
/// <summary>
/// Parses the specified string into a collection of path segments.
/// </summary>
/// <param name="path">A <see cref="string"/> containing path data.</param>
public static SvgPathSegmentList Parse(string path)
{
if (path == null)
throw new ArgumentNullException("path");
var segments = new SvgPathSegmentList();
try
{
foreach (var commandSet in SplitCommands(path.TrimEnd(null)))
{
var command = commandSet[0];
var isRelative = char.IsLower(command);
// http://www.w3.org/TR/SVG11/paths.html#PathDataGeneralInformation
CreatePathSegment(command, segments, new CoordinateParser(commandSet.Trim()), isRelative);
}
}
catch (Exception exc)
{
Trace.TraceError("Error parsing path \"{0}\": {1}", path, exc.Message);
}
return segments;
}
private static void CreatePathSegment(char command, SvgPathSegmentList segments, CoordinateParser parser, bool isRelative)
{
var coords = new float[6];
switch (command)
{
case 'm': // relative moveto
case 'M': // moveto
if (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]))
segments.Add(new SvgMoveToSegment(ToAbsolute(coords[0], coords[1], segments, isRelative)));
while (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]))
{
segments.Add(new SvgLineSegment(segments.Last.End,
ToAbsolute(coords[0], coords[1], segments, isRelative)));
}
break;
case 'a':
case 'A':
bool size;
bool sweep;
while (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]) &&
parser.TryGetFloat(out coords[2]) && parser.TryGetBool(out size) &&
parser.TryGetBool(out sweep) && parser.TryGetFloat(out coords[3]) &&
parser.TryGetFloat(out coords[4]))
{
// A|a rx ry x-axis-rotation large-arc-flag sweep-flag x y
segments.Add(new SvgArcSegment(segments.Last.End, coords[0], coords[1], coords[2],
size ? SvgArcSize.Large : SvgArcSize.Small,
sweep ? SvgArcSweep.Positive : SvgArcSweep.Negative,
ToAbsolute(coords[3], coords[4], segments, isRelative)));
}
break;
case 'l': // relative lineto
case 'L': // lineto
while (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]))
{
segments.Add(new SvgLineSegment(segments.Last.End,
ToAbsolute(coords[0], coords[1], segments, isRelative)));
}
break;
case 'H': // horizontal lineto
case 'h': // relative horizontal lineto
while (parser.TryGetFloat(out coords[0]))
{
segments.Add(new SvgLineSegment(segments.Last.End,
ToAbsolute(coords[0], segments.Last.End.Y, segments, isRelative, false)));
}
break;
case 'V': // vertical lineto
case 'v': // relative vertical lineto
while (parser.TryGetFloat(out coords[0]))
{
segments.Add(new SvgLineSegment(segments.Last.End,
ToAbsolute(segments.Last.End.X, coords[0], segments, false, isRelative)));
}
break;
case 'Q': // curveto
case 'q': // relative curveto
while (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]) &&
parser.TryGetFloat(out coords[2]) && parser.TryGetFloat(out coords[3]))
{
segments.Add(new SvgQuadraticCurveSegment(segments.Last.End,
ToAbsolute(coords[0], coords[1], segments, isRelative),
ToAbsolute(coords[2], coords[3], segments, isRelative)));
}
break;
case 'T': // shorthand/smooth curveto
case 't': // relative shorthand/smooth curveto
while (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]))
{
var lastQuadCurve = segments.Last as SvgQuadraticCurveSegment;
var controlPoint = lastQuadCurve != null
? Reflect(lastQuadCurve.ControlPoint, segments.Last.End)
: segments.Last.End;
segments.Add(new SvgQuadraticCurveSegment(segments.Last.End, controlPoint,
ToAbsolute(coords[0], coords[1], segments, isRelative)));
}
break;
case 'C': // curveto
case 'c': // relative curveto
while (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]) &&
parser.TryGetFloat(out coords[2]) && parser.TryGetFloat(out coords[3]) &&
parser.TryGetFloat(out coords[4]) && parser.TryGetFloat(out coords[5]))
{
segments.Add(new SvgCubicCurveSegment(segments.Last.End,
ToAbsolute(coords[0], coords[1], segments, isRelative),
ToAbsolute(coords[2], coords[3], segments, isRelative),
ToAbsolute(coords[4], coords[5], segments, isRelative)));
}
break;
case 'S': // shorthand/smooth curveto
case 's': // relative shorthand/smooth curveto
while (parser.TryGetFloat(out coords[0]) && parser.TryGetFloat(out coords[1]) &&
parser.TryGetFloat(out coords[2]) && parser.TryGetFloat(out coords[3]))
{
var lastCubicCurve = segments.Last as SvgCubicCurveSegment;
var controlPoint = lastCubicCurve != null
? Reflect(lastCubicCurve.SecondControlPoint, segments.Last.End)
: segments.Last.End;
segments.Add(new SvgCubicCurveSegment(segments.Last.End, controlPoint,
ToAbsolute(coords[0], coords[1], segments, isRelative),
ToAbsolute(coords[2], coords[3], segments, isRelative)));
}
break;
case 'Z': // closepath
case 'z': // relative closepath
segments.Add(new SvgClosePathSegment());
break;
}
}
private static PointF Reflect(PointF point, PointF mirror)
{
var dx = Math.Abs(mirror.X - point.X);
var dy = Math.Abs(mirror.Y - point.Y);
var x = mirror.X + (mirror.X >= point.X ? dx : -dx);
var y = mirror.Y + (mirror.Y >= point.Y ? dy : -dy);
return new PointF(x, y);
}
/// <summary>
/// Creates point with absolute coorindates.
/// </summary>
/// <param name="x">Raw X-coordinate value.</param>
/// <param name="y">Raw Y-coordinate value.</param>
/// <param name="segments">Current path segments.</param>
/// <param name="isRelativeBoth"><b>true</b> if <paramref name="x"/> and <paramref name="y"/> contains relative coordinate values, otherwise <b>false</b>.</param>
/// <returns><see cref="PointF"/> that contains absolute coordinates.</returns>
private static PointF ToAbsolute(float x, float y, SvgPathSegmentList segments, bool isRelativeBoth)
{
return ToAbsolute(x, y, segments, isRelativeBoth, isRelativeBoth);
}
/// <summary>
/// Creates point with absolute coorindates.
/// </summary>
/// <param name="x">Raw X-coordinate value.</param>
/// <param name="y">Raw Y-coordinate value.</param>
/// <param name="segments">Current path segments.</param>
/// <param name="isRelativeX"><b>true</b> if <paramref name="x"/> contains relative coordinate value, otherwise <b>false</b>.</param>
/// <param name="isRelativeY"><b>true</b> if <paramref name="y"/> contains relative coordinate value, otherwise <b>false</b>.</param>
/// <returns><see cref="PointF"/> that contains absolute coordinates.</returns>
private static PointF ToAbsolute(float x, float y, SvgPathSegmentList segments, bool isRelativeX, bool isRelativeY)
{
var point = new PointF(x, y);
if ((isRelativeX || isRelativeY) && segments.Count > 0)
{
var lastSegment = segments.Last;
// if the last element is a SvgClosePathSegment the position of the previous element should be used because the position of SvgClosePathSegment is 0,0
if (lastSegment is SvgClosePathSegment)
lastSegment = segments.Reverse().OfType<SvgMoveToSegment>().First();
if (isRelativeX)
point.X += lastSegment.End.X;
if (isRelativeY)
point.Y += lastSegment.End.Y;
}
return point;
}
private static IEnumerable<string> SplitCommands(string path)
{
var commandStart = 0;
for (var i = 0; i < path.Length; ++i)
{
if (char.IsLetter(path[i]) && path[i] != 'e' && path[i] != 'E') // e is used in scientific notiation. but not svg path
{
var command = path.Substring(commandStart, i - commandStart).Trim();
commandStart = i;
if (!string.IsNullOrEmpty(command))
yield return command;
if (path.Length == i + 1)
yield return path[i].ToString();
}
else if (path.Length == i + 1)
{
var command = path.Substring(commandStart, i - commandStart + 1).Trim();
if (!string.IsNullOrEmpty(command))
yield return command;
}
}
}
//private static IEnumerable<float> ParseCoordinates(string coords)
//{
// if (string.IsNullOrEmpty(coords) || coords.Length < 2) yield break;
// var pos = 0;
// var currState = NumState.separator;
// var newState = NumState.separator;
// for (int i = 1; i < coords.Length; ++i)
// {
// switch (currState)
// {
// case NumState.separator:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.integer;
// }
// else if (IsCoordSeparator(coords[i]))
// {
// newState = NumState.separator;
// }
// else
// {
// switch (coords[i])
// {
// case '.':
// newState = NumState.decPlace;
// break;
// case '+':
// case '-':
// newState = NumState.prefix;
// break;
// default:
// newState = NumState.invalid;
// break;
// }
// }
// break;
// case NumState.prefix:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.integer;
// }
// else if (coords[i] == '.')
// {
// newState = NumState.decPlace;
// }
// else
// {
// newState = NumState.invalid;
// }
// break;
// case NumState.integer:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.integer;
// }
// else if (IsCoordSeparator(coords[i]))
// {
// newState = NumState.separator;
// }
// else
// {
// switch (coords[i])
// {
// case '.':
// newState = NumState.decPlace;
// break;
// case 'e':
// newState = NumState.exponent;
// break;
// case '+':
// case '-':
// newState = NumState.prefix;
// break;
// default:
// newState = NumState.invalid;
// break;
// }
// }
// break;
// case NumState.decPlace:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.fraction;
// }
// else if (IsCoordSeparator(coords[i]))
// {
// newState = NumState.separator;
// }
// else
// {
// switch (coords[i])
// {
// case 'e':
// newState = NumState.exponent;
// break;
// case '+':
// case '-':
// newState = NumState.prefix;
// break;
// default:
// newState = NumState.invalid;
// break;
// }
// }
// break;
// case NumState.fraction:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.fraction;
// }
// else if (IsCoordSeparator(coords[i]))
// {
// newState = NumState.separator;
// }
// else
// {
// switch (coords[i])
// {
// case '.':
// newState = NumState.decPlace;
// break;
// case 'e':
// newState = NumState.exponent;
// break;
// case '+':
// case '-':
// newState = NumState.prefix;
// break;
// default:
// newState = NumState.invalid;
// break;
// }
// }
// break;
// case NumState.exponent:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.expValue;
// }
// else if (IsCoordSeparator(coords[i]))
// {
// newState = NumState.invalid;
// }
// else
// {
// switch (coords[i])
// {
// case '+':
// case '-':
// newState = NumState.expPrefix;
// break;
// default:
// newState = NumState.invalid;
// break;
// }
// }
// break;
// case NumState.expPrefix:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.expValue;
// }
// else
// {
// newState = NumState.invalid;
// }
// break;
// case NumState.expValue:
// if (char.IsNumber(coords[i]))
// {
// newState = NumState.expValue;
// }
// else if (IsCoordSeparator(coords[i]))
// {
// newState = NumState.separator;
// }
// else
// {
// switch (coords[i])
// {
// case '.':
// newState = NumState.decPlace;
// break;
// case '+':
// case '-':
// newState = NumState.prefix;
// break;
// default:
// newState = NumState.invalid;
// break;
// }
// }
// break;
// }
// if (newState < currState)
// {
// yield return float.Parse(coords.Substring(pos, i - pos), NumberStyles.Float, CultureInfo.InvariantCulture);
// pos = i;
// }
// else if (newState != currState && currState == NumState.separator)
// {
// pos = i;
// }
// if (newState == NumState.invalid) yield break;
// currState = newState;
// }
// if (currState != NumState.separator)
// {
// yield return float.Parse(coords.Substring(pos, coords.Length - pos), NumberStyles.Float, CultureInfo.InvariantCulture);
// }
//}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string)
return Parse((string)value);
return base.ConvertFrom(context, culture, value);
}
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == typeof(string))
{
var paths = value as SvgPathSegmentList;
if (paths != null)
{
var curretCulture = CultureInfo.CurrentCulture;
try
{
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
var s = string.Join(" ", paths.Select(p => p.ToString()).ToArray());
return s;
}
finally
{
// Make sure to set back the old culture even an error occurred.
Thread.CurrentThread.CurrentCulture = curretCulture;
}
}
}
return base.ConvertTo(context, culture, value, destinationType);
}
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(string))
return true;
return base.CanConvertTo(context, destinationType);
}
}
}