markus / MarkupToPDF / Controls / Common / StringToPathConverter.cs @ 24c5e56c
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using System; |
|---|---|
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using System.Net; |
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using System.Windows; |
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using System.Windows.Controls; |
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using System.Windows.Documents; |
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using System.Windows.Ink; |
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using System.Windows.Input; |
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using System.Windows.Media; |
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using System.Windows.Media.Animation; |
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using System.Windows.Shapes; |
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using System.Windows.Data; |
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using System.Globalization; |
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|
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namespace MarkupToPDF.Controls.Common |
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{
|
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public class StringToPathConverter : IValueConverter, IDisposable |
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{
|
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#region Const & Private Variables |
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const bool AllowSign = true; |
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const bool AllowComma = true; |
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const bool IsFilled = true; |
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const bool IsClosed = true; |
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|
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IFormatProvider _formatProvider; |
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|
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PathFigure _figure = null; // Figure object, which will accept parsed segments |
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string _pathString; // Input string to be parsed |
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int _pathLength; |
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int _curIndex; // Location to read next character from |
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bool _figureStarted; // StartFigure is effective |
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|
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Point _lastStart; // Last figure starting point |
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Point _lastPoint; // Last point |
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Point _secondLastPoint; // The point before last point |
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|
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char _token; // Non whitespace character returned by ReadToken |
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#endregion |
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|
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#region Public Functionality |
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/// <summary> |
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/// Main conversion routine - converts string path data definition to PathGeometry object |
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/// </summary> |
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/// <param name="path">String with path data definition</param> |
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/// <returns>PathGeometry object created from string definition</returns> |
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public PathGeometry Convert(string path) |
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{
|
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if (null == path) |
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throw new ArgumentException("Path string cannot be null!");
|
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|
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if (path.Length == 0) |
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throw new ArgumentException("Path string cannot be empty!");
|
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|
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return parse(path); |
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} |
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|
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/// <summary> |
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/// Main back conversion routine - converts PathGeometry object to its string equivalent |
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/// </summary> |
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/// <param name="geometry">Path Geometry object</param> |
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/// <returns>String equivalent to PathGeometry contents</returns> |
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public string ConvertBack(PathGeometry geometry) |
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{
|
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if (null == geometry) |
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throw new ArgumentException("Path Geometry cannot be null!");
|
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|
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return parseBack(geometry); |
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} |
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#endregion |
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|
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#region Private Functionality |
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/// <summary> |
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/// Main parser routine, which loops over each char in received string, and performs actions according to command/parameter being passed |
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/// </summary> |
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/// <param name="path">String with path data definition</param> |
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/// <returns>PathGeometry object created from string definition</returns> |
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private PathGeometry parse(string path) |
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{
|
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PathGeometry _pathGeometry = null; |
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|
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|
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_formatProvider = CultureInfo.InvariantCulture; |
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_pathString = path; |
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_pathLength = path.Length; |
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_curIndex = 0; |
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|
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_secondLastPoint = new Point(0, 0); |
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_lastPoint = new Point(0, 0); |
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_lastStart = new Point(0, 0); |
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|
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_figureStarted = false; |
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|
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bool first = true; |
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|
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char last_cmd = ' '; |
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|
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while (ReadToken()) // Empty path is allowed in XAML |
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{
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char cmd = _token; |
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|
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if (first) |
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{
|
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if ((cmd != 'M') && (cmd != 'm')) // Path starts with M|m |
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{
|
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ThrowBadToken(); |
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} |
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|
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first = false; |
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} |
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|
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switch (cmd) |
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{
|
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case 'm': |
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case 'M': |
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// XAML allows multiple points after M/m |
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_lastPoint = ReadPoint(cmd, !AllowComma); |
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|
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_figure = new PathFigure(); |
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_figure.StartPoint = _lastPoint; |
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_figure.IsFilled = IsFilled; |
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_figure.IsClosed = !IsClosed; |
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//context.BeginFigure(_lastPoint, IsFilled, !IsClosed); |
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_figureStarted = true; |
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_lastStart = _lastPoint; |
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last_cmd = 'M'; |
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|
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while (IsNumber(AllowComma)) |
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{
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_lastPoint = ReadPoint(cmd, !AllowComma); |
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|
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LineSegment _lineSegment = new LineSegment(); |
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_lineSegment.Point = _lastPoint; |
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_figure.Segments.Add(_lineSegment); |
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//context.LineTo(_lastPoint, IsStroked, !IsSmoothJoin); |
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last_cmd = 'L'; |
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} |
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break; |
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|
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case 'l': |
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case 'L': |
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case 'h': |
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case 'H': |
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case 'v': |
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case 'V': |
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EnsureFigure(); |
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|
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do |
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{
|
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switch (cmd) |
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{
|
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case 'l': _lastPoint = ReadPoint(cmd, !AllowComma); break; |
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case 'L': _lastPoint = ReadPoint(cmd, !AllowComma); break; |
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case 'h': _lastPoint.X += ReadNumber(!AllowComma); break; |
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case 'H': _lastPoint.X = ReadNumber(!AllowComma); break; |
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case 'v': _lastPoint.Y += ReadNumber(!AllowComma); break; |
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case 'V': _lastPoint.Y = ReadNumber(!AllowComma); break; |
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} |
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|
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LineSegment _lineSegment = new LineSegment(); |
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_lineSegment.Point = _lastPoint; |
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_figure.Segments.Add(_lineSegment); |
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//context.LineTo(_lastPoint, IsStroked, !IsSmoothJoin); |
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} |
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while (IsNumber(AllowComma)); |
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|
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last_cmd = 'L'; |
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break; |
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|
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case 'c': |
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case 'C': // cubic Bezier |
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case 's': |
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case 'S': // smooth cublic Bezier |
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EnsureFigure(); |
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|
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do |
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{
|
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Point p; |
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|
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if ((cmd == 's') || (cmd == 'S')) |
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{
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if (last_cmd == 'C') |
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{
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p = Reflect(); |
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} |
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else |
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{
|
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p = _lastPoint; |
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} |
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|
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_secondLastPoint = ReadPoint(cmd, !AllowComma); |
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} |
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else |
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{
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p = ReadPoint(cmd, !AllowComma); |
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|
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_secondLastPoint = ReadPoint(cmd, AllowComma); |
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} |
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|
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_lastPoint = ReadPoint(cmd, AllowComma); |
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|
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BezierSegment _bizierSegment = new BezierSegment(); |
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_bizierSegment.Point1 = p; |
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_bizierSegment.Point2 = _secondLastPoint; |
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_bizierSegment.Point3 = _lastPoint; |
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_figure.Segments.Add(_bizierSegment); |
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//context.BezierTo(p, _secondLastPoint, _lastPoint, IsStroked, !IsSmoothJoin); |
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|
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last_cmd = 'C'; |
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} |
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while (IsNumber(AllowComma)); |
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|
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break; |
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|
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case 'q': |
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case 'Q': // quadratic Bezier |
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case 't': |
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case 'T': // smooth quadratic Bezier |
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EnsureFigure(); |
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|
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do |
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{
|
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if ((cmd == 't') || (cmd == 'T')) |
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{
|
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if (last_cmd == 'Q') |
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{
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_secondLastPoint = Reflect(); |
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} |
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else |
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{
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_secondLastPoint = _lastPoint; |
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} |
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|
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_lastPoint = ReadPoint(cmd, !AllowComma); |
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} |
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else |
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{
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_secondLastPoint = ReadPoint(cmd, !AllowComma); |
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_lastPoint = ReadPoint(cmd, AllowComma); |
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} |
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|
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QuadraticBezierSegment _quadraticBezierSegment = new QuadraticBezierSegment(); |
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_quadraticBezierSegment.Point1 = _secondLastPoint; |
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_quadraticBezierSegment.Point2 = _lastPoint; |
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_figure.Segments.Add(_quadraticBezierSegment); |
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//context.QuadraticBezierTo(_secondLastPoint, _lastPoint, IsStroked, !IsSmoothJoin); |
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|
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last_cmd = 'Q'; |
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} |
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while (IsNumber(AllowComma)); |
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break; |
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|
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case 'a': |
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case 'A': |
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EnsureFigure(); |
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|
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do |
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{
|
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// A 3,4 5, 0, 0, 6,7 |
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double w = ReadNumber(!AllowComma); |
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double h = ReadNumber(AllowComma); |
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double rotation = ReadNumber(AllowComma); |
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bool large = ReadBool(); |
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bool sweep = ReadBool(); |
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|
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_lastPoint = ReadPoint(cmd, AllowComma); |
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|
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ArcSegment _arcSegment = new ArcSegment(); |
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_arcSegment.Point = _lastPoint; |
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_arcSegment.Size = new Size(w, h); |
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_arcSegment.RotationAngle = rotation; |
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_arcSegment.IsLargeArc = large; |
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_arcSegment.SweepDirection = sweep ? SweepDirection.Clockwise : SweepDirection.Counterclockwise; |
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_figure.Segments.Add(_arcSegment); |
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//context.ArcTo( |
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// _lastPoint, |
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// new Size(w, h), |
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// rotation, |
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// large, |
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// sweep ? SweepDirection.Clockwise : SweepDirection.Counterclockwise, |
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// IsStroked, |
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// !IsSmoothJoin |
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// ); |
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} |
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while (IsNumber(AllowComma)); |
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|
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last_cmd = 'A'; |
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break; |
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|
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case 'z': |
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case 'Z': |
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EnsureFigure(); |
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_figure.IsClosed = IsClosed; |
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//context.SetClosedState(IsClosed); |
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|
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_figureStarted = false; |
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last_cmd = 'Z'; |
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|
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_lastPoint = _lastStart; // Set reference point to be first point of current figure |
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break; |
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|
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default: |
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ThrowBadToken(); |
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break; |
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} |
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} |
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|
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if (null != _figure) |
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{
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_pathGeometry = new PathGeometry(); |
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_pathGeometry.Figures.Add(_figure); |
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|
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} |
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return _pathGeometry; |
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} |
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|
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void SkipDigits(bool signAllowed) |
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{
|
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// Allow for a sign |
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if (signAllowed && More() && ((_pathString[_curIndex] == '-') || _pathString[_curIndex] == '+')) |
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{
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_curIndex++; |
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} |
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|
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while (More() && (_pathString[_curIndex] >= '0') && (_pathString[_curIndex] <= '9')) |
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{
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_curIndex++; |
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} |
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} |
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|
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bool ReadBool() |
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{
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SkipWhiteSpace(AllowComma); |
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|
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if (More()) |
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{
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_token = _pathString[_curIndex++]; |
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|
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if (_token == '0') |
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{
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return false; |
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} |
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else if (_token == '1') |
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{
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return true; |
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} |
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} |
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|
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ThrowBadToken(); |
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|
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return false; |
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} |
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|
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private Point Reflect() |
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{
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return new Point(2 * _lastPoint.X - _secondLastPoint.X, |
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2 * _lastPoint.Y - _secondLastPoint.Y); |
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} |
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|
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private void EnsureFigure() |
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{
|
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if (!_figureStarted) |
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{
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_figure = new PathFigure(); |
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_figure.StartPoint = _lastStart; |
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|
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//_context.BeginFigure(_lastStart, IsFilled, !IsClosed); |
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_figureStarted = true; |
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} |
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} |
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|
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double ReadNumber(bool allowComma) |
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{
|
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if (!IsNumber(allowComma)) |
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{
|
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ThrowBadToken(); |
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} |
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|
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bool simple = true; |
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int start = _curIndex; |
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|
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// |
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// Allow for a sign |
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// |
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// There are numbers that cannot be preceded with a sign, for instance, -NaN, but it's |
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// fine to ignore that at this point, since the CLR parser will catch this later. |
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// |
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if (More() && ((_pathString[_curIndex] == '-') || _pathString[_curIndex] == '+')) |
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{
|
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_curIndex++; |
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} |
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|
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// Check for Infinity (or -Infinity). |
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if (More() && (_pathString[_curIndex] == 'I')) |
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{
|
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// |
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// Don't bother reading the characters, as the CLR parser will |
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// do this for us later. |
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// |
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_curIndex = Math.Min(_curIndex + 8, _pathLength); // "Infinity" has 8 characters |
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simple = false; |
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} |
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// Check for NaN |
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else if (More() && (_pathString[_curIndex] == 'N')) |
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{
|
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// |
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// Don't bother reading the characters, as the CLR parser will |
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// do this for us later. |
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// |
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_curIndex = Math.Min(_curIndex + 3, _pathLength); // "NaN" has 3 characters |
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simple = false; |
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} |
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else |
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{
|
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SkipDigits(!AllowSign); |
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|
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// Optional period, followed by more digits |
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if (More() && (_pathString[_curIndex] == '.')) |
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{
|
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simple = false; |
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_curIndex++; |
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SkipDigits(!AllowSign); |
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} |
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|
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// Exponent |
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if (More() && ((_pathString[_curIndex] == 'E') || (_pathString[_curIndex] == 'e'))) |
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{
|
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simple = false; |
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_curIndex++; |
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SkipDigits(AllowSign); |
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} |
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} |
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|
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if (simple && (_curIndex <= (start + 8))) // 32-bit integer |
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{
|
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int sign = 1; |
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|
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if (_pathString[start] == '+') |
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{
|
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start++; |
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} |
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else if (_pathString[start] == '-') |
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{
|
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start++; |
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sign = -1; |
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} |
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|
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int value = 0; |
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|
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while (start < _curIndex) |
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{
|
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value = value * 10 + (_pathString[start] - '0'); |
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start++; |
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} |
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|
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return value * sign; |
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} |
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else |
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{
|
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string subString = _pathString.Substring(start, _curIndex - start); |
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|
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try |
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{
|
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return System.Convert.ToDouble(subString, _formatProvider); |
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} |
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catch (FormatException except) |
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{
|
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throw new FormatException(string.Format("Unexpected character in path '{0}' at position {1}", _pathString, _curIndex - 1), except);
|
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} |
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} |
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} |
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|
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private bool IsNumber(bool allowComma) |
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{
|
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bool commaMet = SkipWhiteSpace(allowComma); |
| 475 |
|
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if (More()) |
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{
|
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_token = _pathString[_curIndex]; |
| 479 |
|
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// Valid start of a number |
| 481 |
if ((_token == '.') || (_token == '-') || (_token == '+') || ((_token >= '0') && (_token <= '9')) |
| 482 |
|| (_token == 'I') // Infinity |
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|| (_token == 'N')) // NaN |
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{
|
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return true; |
| 486 |
} |
| 487 |
} |
| 488 |
|
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if (commaMet) // Only allowed between numbers |
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{
|
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ThrowBadToken(); |
| 492 |
} |
| 493 |
|
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return false; |
| 495 |
} |
| 496 |
|
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private Point ReadPoint(char cmd, bool allowcomma) |
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{
|
| 499 |
double x = ReadNumber(allowcomma); |
| 500 |
double y = ReadNumber(AllowComma); |
| 501 |
|
| 502 |
if (cmd >= 'a') // 'A' < 'a'. lower case for relative |
| 503 |
{
|
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x += _lastPoint.X; |
| 505 |
y += _lastPoint.Y; |
| 506 |
} |
| 507 |
|
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return new Point(x, y); |
| 509 |
} |
| 510 |
|
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private bool ReadToken() |
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{
|
| 513 |
SkipWhiteSpace(!AllowComma); |
| 514 |
|
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// Check for end of string |
| 516 |
if (More()) |
| 517 |
{
|
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_token = _pathString[_curIndex++]; |
| 519 |
|
| 520 |
return true; |
| 521 |
} |
| 522 |
else |
| 523 |
{
|
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return false; |
| 525 |
} |
| 526 |
} |
| 527 |
|
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bool More() |
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{
|
| 530 |
return _curIndex < _pathLength; |
| 531 |
} |
| 532 |
|
| 533 |
// Skip white space, one comma if allowed |
| 534 |
private bool SkipWhiteSpace(bool allowComma) |
| 535 |
{
|
| 536 |
bool commaMet = false; |
| 537 |
|
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while (More()) |
| 539 |
{
|
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char ch = _pathString[_curIndex]; |
| 541 |
|
| 542 |
switch (ch) |
| 543 |
{
|
| 544 |
case ' ': |
| 545 |
case '\n': |
| 546 |
case '\r': |
| 547 |
case '\t': // SVG whitespace |
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break; |
| 549 |
case ';': |
| 550 |
case ',': |
| 551 |
if (allowComma) |
| 552 |
{
|
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commaMet = true; |
| 554 |
allowComma = false; // one comma only |
| 555 |
} |
| 556 |
else |
| 557 |
{
|
| 558 |
ThrowBadToken(); |
| 559 |
} |
| 560 |
break; |
| 561 |
|
| 562 |
default: |
| 563 |
// Avoid calling IsWhiteSpace for ch in (' ' .. 'z']
|
| 564 |
if (((ch > ' ') && (ch <= 'z')) || !Char.IsWhiteSpace(ch)) |
| 565 |
{
|
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return commaMet; |
| 567 |
} |
| 568 |
break; |
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} |
| 570 |
|
| 571 |
_curIndex++; |
| 572 |
} |
| 573 |
|
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return commaMet; |
| 575 |
} |
| 576 |
|
| 577 |
private void ThrowBadToken() |
| 578 |
{
|
| 579 |
throw new FormatException(string.Format("Unexpected character in path '{0}' at position {1}", _pathString, _curIndex - 1));
|
| 580 |
} |
| 581 |
|
| 582 |
static internal char GetNumericListSeparator(IFormatProvider provider) |
| 583 |
{
|
| 584 |
char numericSeparator = ','; |
| 585 |
|
| 586 |
// Get the NumberFormatInfo out of the provider, if possible |
| 587 |
// If the IFormatProvider doesn't not contain a NumberFormatInfo, then |
| 588 |
// this method returns the current culture's NumberFormatInfo. |
| 589 |
NumberFormatInfo numberFormat = NumberFormatInfo.GetInstance(provider); |
| 590 |
|
| 591 |
// Is the decimal separator is the same as the list separator? |
| 592 |
// If so, we use the ";". |
| 593 |
if ((numberFormat.NumberDecimalSeparator.Length > 0) && (numericSeparator == numberFormat.NumberDecimalSeparator[0])) |
| 594 |
{
|
| 595 |
numericSeparator = ';'; |
| 596 |
} |
| 597 |
|
| 598 |
return numericSeparator; |
| 599 |
} |
| 600 |
|
| 601 |
private string parseBack(PathGeometry geometry) |
| 602 |
{
|
| 603 |
System.Text.StringBuilder sb = new System.Text.StringBuilder(); |
| 604 |
IFormatProvider provider = new System.Globalization.CultureInfo("en-us");
|
| 605 |
string format = null; |
| 606 |
|
| 607 |
foreach (PathFigure figure in geometry.Figures) |
| 608 |
{
|
| 609 |
sb.Append("M " + ((IFormattable)figure.StartPoint).ToString(format, provider) + " ");
|
| 610 |
|
| 611 |
foreach (PathSegment segment in figure.Segments) |
| 612 |
{
|
| 613 |
char separator = GetNumericListSeparator(provider); |
| 614 |
|
| 615 |
if (segment.GetType() == typeof(LineSegment)) |
| 616 |
{
|
| 617 |
LineSegment _lineSegment = segment as LineSegment; |
| 618 |
|
| 619 |
sb.Append("L " + ((IFormattable)_lineSegment.Point).ToString(format, provider) + " ");
|
| 620 |
} |
| 621 |
else if (segment.GetType() == typeof(BezierSegment)) |
| 622 |
{
|
| 623 |
BezierSegment _bezierSegment = segment as BezierSegment; |
| 624 |
|
| 625 |
sb.Append(String.Format(provider, |
| 626 |
"C{1:" + format + "}{0}{2:" + format + "}{0}{3:" + format + "} ",
|
| 627 |
separator, |
| 628 |
_bezierSegment.Point1, |
| 629 |
_bezierSegment.Point2, |
| 630 |
_bezierSegment.Point3 |
| 631 |
)); |
| 632 |
} |
| 633 |
else if (segment.GetType() == typeof(QuadraticBezierSegment)) |
| 634 |
{
|
| 635 |
QuadraticBezierSegment _quadraticBezierSegment = segment as QuadraticBezierSegment; |
| 636 |
|
| 637 |
sb.Append(String.Format(provider, |
| 638 |
"Q{1:" + format + "}{0}{2:" + format + "} ",
|
| 639 |
separator, |
| 640 |
_quadraticBezierSegment.Point1, |
| 641 |
_quadraticBezierSegment.Point2)); |
| 642 |
} |
| 643 |
else if (segment.GetType() == typeof(ArcSegment)) |
| 644 |
{
|
| 645 |
ArcSegment _arcSegment = segment as ArcSegment; |
| 646 |
|
| 647 |
sb.Append(String.Format(provider, |
| 648 |
"A{1:" + format + "}{0}{2:" + format + "}{0}{3}{0}{4}{0}{5:" + format + "} ",
|
| 649 |
separator, |
| 650 |
_arcSegment.Size, |
| 651 |
_arcSegment.RotationAngle, |
| 652 |
_arcSegment.IsLargeArc ? "1" : "0", |
| 653 |
_arcSegment.SweepDirection == SweepDirection.Clockwise ? "1" : "0", |
| 654 |
_arcSegment.Point)); |
| 655 |
} |
| 656 |
} |
| 657 |
|
| 658 |
if (figure.IsClosed) |
| 659 |
sb.Append("Z");
|
| 660 |
} |
| 661 |
|
| 662 |
return sb.ToString(); |
| 663 |
} |
| 664 |
#endregion |
| 665 |
|
| 666 |
#region IValueConverter Members |
| 667 |
|
| 668 |
public object Convert(object value, Type targetType, object parameter, CultureInfo culture) |
| 669 |
{
|
| 670 |
string path = value as string; |
| 671 |
if (null != path) |
| 672 |
return Convert(path); |
| 673 |
else |
| 674 |
return null; |
| 675 |
} |
| 676 |
|
| 677 |
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) |
| 678 |
{
|
| 679 |
PathGeometry geometry = value as PathGeometry; |
| 680 |
|
| 681 |
if (null != geometry) |
| 682 |
return ConvertBack(geometry); |
| 683 |
else |
| 684 |
return default(string); |
| 685 |
} |
| 686 |
|
| 687 |
#endregion |
| 688 |
|
| 689 |
public void Dispose() |
| 690 |
{
|
| 691 |
//GC.Collect(); |
| 692 |
////GC.SuppressFinalize(this); |
| 693 |
} |
| 694 |
} |
| 695 |
} |
