| 1 | using System;
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| 2 | using System.Text;
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| 3 | using System.Collections.Generic;
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| 4 | using System.Text.RegularExpressions;
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| 5 |
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| 6 | namespace SharpVectors.Dom.Svg
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| 7 | {
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| 8 | // TODO: should we check that the list starts with a M/m since that's required by the spec?
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| 9 | public class SvgPathSegList : ISvgPathSegList
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| 10 | {
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| 11 | #region Private Fields
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| 12 |
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| 13 | private string _pathScript;
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| 14 | private bool readOnly;
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| 15 | private List<ISvgPathSeg> segments = new List<ISvgPathSeg>();
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| 16 |
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| 17 | private static Regex rePathCmd = new Regex(@"(?=[A-DF-Za-df-z])");
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| 18 | private static Regex coordSplit = new Regex(@"(\s*,\s*)|(\s+)|((?<=[0-9])(?=-))", RegexOptions.ExplicitCapture);
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| 19 |
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| 20 | #endregion
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| 21 |
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| 22 | #region Constructors
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| 23 |
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| 24 | public SvgPathSegList(string d, bool readOnly)
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| 25 | {
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| 26 | if (d == null)
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| 27 | {
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| 28 | d = String.Empty;
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| 29 | }
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| 30 |
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| 31 | _pathScript = d;
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| 32 |
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| 33 | if (!String.IsNullOrEmpty(d))
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| 34 | {
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| 35 | ParseString(d);
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| 36 | }
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| 37 |
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| 38 | this.readOnly = readOnly;
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| 39 | }
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| 40 |
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| 41 | #endregion
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| 42 |
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| 43 | #region Public Properties
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| 44 |
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| 45 | public string PathScript
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| 46 | {
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| 47 | get
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| 48 | {
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| 49 | return _pathScript;
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| 50 | }
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| 51 | }
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| 52 |
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| 53 | #endregion
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| 54 |
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| 55 | #region Private Methods
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| 56 |
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| 57 | private void ParseString(string d)
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| 58 | {
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| 59 | ISvgPathSeg seg;
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| 60 | string[] segs = rePathCmd.Split(d);
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| 61 |
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| 62 | foreach (string s in segs)
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| 63 | {
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| 64 | string segment = s.Trim();
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| 65 | if (segment.Length > 0)
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| 66 | {
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| 67 | char cmd = (char)segment.ToCharArray(0, 1)[0];
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| 68 | double[] coords = getCoords(segment);
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| 69 | int length = coords.Length;
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| 70 | switch (cmd)
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| 71 | {
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| 72 | #region moveto
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| 73 | case 'M':
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| 74 | for (int i = 0; i < length; i += 2)
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| 75 | {
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| 76 | if (i == 0)
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| 77 | {
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| 78 | seg = new SvgPathSegMovetoAbs(coords[i], coords[i + 1]);
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| 79 | }
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| 80 | else
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| 81 | {
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| 82 | seg = new SvgPathSegLinetoAbs(coords[i], coords[i + 1]);
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| 83 | }
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| 84 | AppendItem(seg);
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| 85 | }
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| 86 | break;
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| 87 | case 'm':
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| 88 | for (int i = 0; i < length; i += 2)
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| 89 | {
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| 90 | if (i == 0)
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| 91 | {
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| 92 | seg = new SvgPathSegMovetoRel(coords[i], coords[i + 1]);
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| 93 | }
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| 94 | else
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| 95 | {
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| 96 | seg = new SvgPathSegLinetoRel(coords[i], coords[i + 1]);
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| 97 | }
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| 98 | AppendItem(seg);
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| 99 | }
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| 100 | break;
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| 101 | #endregion
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| 102 | #region lineto
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| 103 | case 'L':
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| 104 | for (int i = 0; i < length; i += 2)
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| 105 | {
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| 106 | seg = new SvgPathSegLinetoAbs(coords[i], coords[i + 1]);
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| 107 | AppendItem(seg);
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| 108 | }
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| 109 | break;
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| 110 | case 'l':
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| 111 | for (int i = 0; i < length; i += 2)
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| 112 | {
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| 113 | seg = new SvgPathSegLinetoRel(coords[i], coords[i + 1]);
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| 114 | AppendItem(seg);
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| 115 | }
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| 116 | break;
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| 117 | case 'H':
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| 118 | for (int i = 0; i < length; i++)
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| 119 | {
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| 120 | seg = new SvgPathSegLinetoHorizontalAbs(coords[i]);
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| 121 | AppendItem(seg);
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| 122 | }
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| 123 | break;
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| 124 | case 'h':
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| 125 | for (int i = 0; i < length; i++)
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| 126 | {
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| 127 | seg = new SvgPathSegLinetoHorizontalRel(coords[i]);
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| 128 | AppendItem(seg);
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| 129 | }
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| 130 | break;
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| 131 | case 'V':
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| 132 | for (int i = 0; i < length; i++)
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| 133 | {
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| 134 | seg = new SvgPathSegLinetoVerticalAbs(coords[i]);
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| 135 | AppendItem(seg);
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| 136 | }
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| 137 | break;
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| 138 | case 'v':
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| 139 | for (int i = 0; i < length; i++)
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| 140 | {
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| 141 | seg = new SvgPathSegLinetoVerticalRel(coords[i]);
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| 142 | AppendItem(seg);
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| 143 | }
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| 144 | break;
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| 145 | #endregion
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| 146 | #region beziers
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| 147 | case 'C':
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| 148 | for (int i = 0; i < length; i += 6)
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| 149 | {
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| 150 | seg = new SvgPathSegCurvetoCubicAbs(
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| 151 | coords[i + 4],
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| 152 | coords[i + 5],
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| 153 | coords[i],
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| 154 | coords[i + 1],
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| 155 | coords[i + 2],
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| 156 | coords[i + 3]);
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| 157 | AppendItem(seg);
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| 158 | }
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| 159 | break;
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| 160 | case 'c':
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| 161 | for (int i = 0; i < length; i += 6)
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| 162 | {
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| 163 | seg = new SvgPathSegCurvetoCubicRel(
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| 164 | coords[i + 4],
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| 165 | coords[i + 5],
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| 166 | coords[i],
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| 167 | coords[i + 1],
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| 168 | coords[i + 2],
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| 169 | coords[i + 3]);
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| 170 |
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| 171 | AppendItem(seg);
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| 172 | }
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| 173 | break;
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| 174 | case 'S':
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| 175 | for (int i = 0; i < length; i += 4)
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| 176 | {
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| 177 | seg = new SvgPathSegCurvetoCubicSmoothAbs(
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| 178 | coords[i + 2],
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| 179 | coords[i + 3],
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| 180 | coords[i],
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| 181 | coords[i + 1]);
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| 182 | AppendItem(seg);
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| 183 | }
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| 184 | break;
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| 185 | case 's':
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| 186 | for (int i = 0; i < length; i += 4)
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| 187 | {
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| 188 | seg = new SvgPathSegCurvetoCubicSmoothRel(
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| 189 | coords[i + 2],
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| 190 | coords[i + 3],
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| 191 | coords[i],
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| 192 | coords[i + 1]);
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| 193 | AppendItem(seg);
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| 194 | }
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| 195 | break;
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| 196 | case 'Q':
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| 197 | for (int i = 0; i < length; i += 4)
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| 198 | {
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| 199 | seg = new SvgPathSegCurvetoQuadraticAbs(
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| 200 | coords[i + 2],
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| 201 | coords[i + 3],
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| 202 | coords[i],
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| 203 | coords[i + 1]);
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| 204 | AppendItem(seg);
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| 205 | }
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| 206 | break;
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| 207 | case 'q':
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| 208 | for (int i = 0; i < length; i += 4)
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| 209 | {
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| 210 | seg = new SvgPathSegCurvetoQuadraticRel(
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| 211 | coords[i + 2],
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| 212 | coords[i + 3],
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| 213 | coords[i],
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| 214 | coords[i + 1]);
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| 215 | AppendItem(seg);
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| 216 | }
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| 217 | break;
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| 218 | case 'T':
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| 219 | for (int i = 0; i < length; i += 2)
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| 220 | {
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| 221 | seg = new SvgPathSegCurvetoQuadraticSmoothAbs(
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| 222 | coords[i], coords[i + 1]);
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| 223 | AppendItem(seg);
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| 224 | }
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| 225 | break;
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| 226 | case 't':
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| 227 | for (int i = 0; i < length; i += 2)
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| 228 | {
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| 229 | seg = new SvgPathSegCurvetoQuadraticSmoothRel(
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| 230 | coords[i], coords[i + 1]);
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| 231 | AppendItem(seg);
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| 232 | }
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| 233 | break;
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| 234 | #endregion
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| 235 | #region arcs
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| 236 | case 'A':
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| 237 | case 'a':
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| 238 | for (int i = 0; i < length; i += 7)
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| 239 | {
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| 240 | if (cmd == 'A')
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| 241 | {
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| 242 | seg = new SvgPathSegArcAbs(
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| 243 | coords[i + 5],
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| 244 | coords[i + 6],
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| 245 | coords[i],
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| 246 | coords[i + 1],
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| 247 | coords[i + 2],
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| 248 | (coords[i + 3] != 0),
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| 249 | (coords[i + 4] != 0));
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| 250 | }
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| 251 | else
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| 252 | {
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| 253 | seg = new SvgPathSegArcRel(
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| 254 | coords[i + 5],
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| 255 | coords[i + 6],
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| 256 | coords[i],
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| 257 | coords[i + 1],
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| 258 | coords[i + 2],
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| 259 | (coords[i + 3] != 0),
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| 260 | (coords[i + 4] != 0));
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| 261 | }
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| 262 | AppendItem(seg);
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| 263 | }
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| 264 | break;
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| 265 | #endregion
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| 266 | #region close
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| 267 | case 'z':
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| 268 | case 'Z':
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| 269 | seg = new SvgPathSegClosePath();
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| 270 | AppendItem(seg);
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| 271 | break;
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| 272 | #endregion
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| 273 | #region Unknown path command
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| 274 | default:
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| 275 | throw new ApplicationException(String.Format("Unknown path command - ({0})", cmd));
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| 276 | #endregion
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| 277 | }
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| 278 | }
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| 279 | }
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| 280 | }
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| 281 |
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| 282 | private double[] getCoords(String segment)
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| 283 | {
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| 284 | double[] coords = new double[0];
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| 285 |
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| 286 | segment = segment.Substring(1);
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| 287 | segment = segment.Trim();
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| 288 | segment = segment.Trim(new char[] { ',' });
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| 289 |
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| 290 | if (segment.Length > 0)
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| 291 | {
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| 292 | string[] sCoords = coordSplit.Split(segment);
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| 293 |
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| 294 | coords = new double[sCoords.Length];
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| 295 | for (int i = 0; i < sCoords.Length; i++)
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| 296 | {
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| 297 | coords[i] = SvgNumber.ParseNumber(sCoords[i]);
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| 298 | }
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| 299 | }
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| 300 | return coords;
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| 301 | }
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| 302 |
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| 303 | private void setListAndIndex(SvgPathSeg newItem, int index)
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| 304 | {
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| 305 | if (newItem != null)
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| 306 | {
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| 307 | newItem.SetList(this);
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| 308 | newItem.SetIndex(index);
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| 309 | }
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| 310 | else
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| 311 | {
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| 312 | throw new SvgException(SvgExceptionType.SvgWrongTypeErr,
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| 313 | "Can only add SvgPathSeg subclasses to ISvgPathSegList");
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| 314 | }
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| 315 | }
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| 316 |
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| 317 | private void changeIndexes(int startAt, int diff)
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| 318 | {
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| 319 | int count = segments.Count;
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| 320 | for (int i = startAt; i < count; i++)
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| 321 | {
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| 322 | SvgPathSeg seg = segments[i] as SvgPathSeg;
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| 323 | if (seg != null)
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| 324 | {
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| 325 | seg.SetIndexWithDiff(diff);
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| 326 | }
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| 327 | }
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| 328 | }
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| 329 | #endregion
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| 330 |
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| 331 | #region ISvgPathSegList Members
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| 332 |
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| 333 | public int NumberOfItems
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| 334 | {
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| 335 | get
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| 336 | {
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| 337 | return segments.Count;
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| 338 | }
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| 339 | }
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| 340 |
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| 341 | public void Clear()
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| 342 | {
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| 343 | if (readOnly)
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| 344 | {
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| 345 | throw new DomException(DomExceptionType.NoModificationAllowedErr);
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| 346 | }
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| 347 | else
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| 348 | {
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| 349 | segments.Clear();
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| 350 | }
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| 351 | }
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| 352 |
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| 353 | public ISvgPathSeg Initialize(ISvgPathSeg newItem)
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| 354 | {
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| 355 | Clear();
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| 356 |
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| 357 | return AppendItem(newItem);
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| 358 | }
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| 359 |
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| 360 | public ISvgPathSeg GetItem(int index)
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| 361 | {
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| 362 | if (index < 0 || index >= NumberOfItems)
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| 363 | {
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| 364 | throw new DomException(DomExceptionType.IndexSizeErr);
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| 365 | }
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| 366 |
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| 367 | return segments[index];
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| 368 | }
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| 369 | public ISvgPathSeg this[int index]
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| 370 | {
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| 371 | get
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| 372 | {
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| 373 | return GetItem(index);
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| 374 | }
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| 375 | set
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| 376 | {
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| 377 | ReplaceItem(value, index);
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| 378 | }
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| 379 | }
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| 380 |
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| 381 | public ISvgPathSeg InsertItemBefore(ISvgPathSeg newItem, int index)
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| 382 | {
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| 383 | if (readOnly)
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| 384 | {
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| 385 | throw new DomException(DomExceptionType.NoModificationAllowedErr);
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| 386 | }
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| 387 | else
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| 388 | {
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| 389 | segments.Insert(index, newItem);
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| 390 | setListAndIndex(newItem as SvgPathSeg, index);
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| 391 | changeIndexes(index + 1, 1);
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| 392 |
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| 393 | return newItem;
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| 394 | }
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| 395 | }
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| 396 |
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| 397 | public ISvgPathSeg ReplaceItem(ISvgPathSeg newItem, int index)
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| 398 | {
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| 399 | if (readOnly)
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| 400 | {
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| 401 | throw new DomException(DomExceptionType.NoModificationAllowedErr);
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| 402 | }
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| 403 | else
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| 404 | {
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| 405 | ISvgPathSeg replacedItem = GetItem(index);
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| 406 | segments[index] = newItem;
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| 407 | setListAndIndex(newItem as SvgPathSeg, index);
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| 408 |
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| 409 | return replacedItem;
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| 410 | }
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| 411 | }
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| 412 |
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| 413 | public ISvgPathSeg RemoveItem(int index)
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| 414 | {
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| 415 | if (readOnly)
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| 416 | {
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| 417 | throw new DomException(DomExceptionType.NoModificationAllowedErr);
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| 418 | }
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| 419 | else
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| 420 | {
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| 421 | ISvgPathSeg result = GetItem(index);
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| 422 | segments.RemoveAt(index);
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| 423 | changeIndexes(index, -1);
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| 424 |
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| 425 | return result;
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| 426 | }
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| 427 | }
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| 428 |
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| 429 | public ISvgPathSeg AppendItem(ISvgPathSeg newItem)
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| 430 | {
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| 431 | if (readOnly)
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| 432 | {
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| 433 | throw new DomException(DomExceptionType.NoModificationAllowedErr);
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| 434 | }
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| 435 | else
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| 436 | {
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| 437 | segments.Add(newItem);
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| 438 | setListAndIndex(newItem as SvgPathSeg, segments.Count - 1);
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| 439 |
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| 440 | return newItem;
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| 441 | }
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| 442 | }
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| 443 |
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| 444 | #endregion
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| 445 |
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| 446 | #region Public members
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| 447 |
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| 448 | public SvgPointF[] Points
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| 449 | {
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| 450 | get
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| 451 | {
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| 452 | List<SvgPointF> ret = new List<SvgPointF>();
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| 453 | foreach (SvgPathSeg seg in segments)
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| 454 | {
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| 455 | ret.Add(seg.AbsXY);
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| 456 | }
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| 457 |
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| 458 | return ret.ToArray();
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| 459 | }
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| 460 | }
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| 461 |
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| 462 | internal SvgPathSeg GetPreviousSegment(SvgPathSeg seg)
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| 463 | {
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| 464 | int index = segments.IndexOf(seg);
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| 465 | if (index == -1)
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| 466 | {
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| 467 | throw new Exception("Path segment not part of this list");
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| 468 | }
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| 469 | else if (index == 0)
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| 470 | {
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| 471 | return null;
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|---|
| 472 | }
|
|---|
| 473 | else
|
|---|
| 474 | {
|
|---|
| 475 | return (SvgPathSeg)GetItem(index - 1);
|
|---|
| 476 | }
|
|---|
| 477 | }
|
|---|
| 478 |
|
|---|
| 479 | internal SvgPathSeg GetNextSegment(SvgPathSeg seg)
|
|---|
| 480 | {
|
|---|
| 481 | int index = segments.IndexOf(seg);
|
|---|
| 482 | if (index == -1)
|
|---|
| 483 | {
|
|---|
| 484 | throw new Exception("Path segment not part of this list");
|
|---|
| 485 | }
|
|---|
| 486 | else if (index == segments.Count - 1)
|
|---|
| 487 | {
|
|---|
| 488 | return null;
|
|---|
| 489 | }
|
|---|
| 490 | else
|
|---|
| 491 | {
|
|---|
| 492 | return (SvgPathSeg)this[index + 1];
|
|---|
| 493 | }
|
|---|
| 494 | }
|
|---|
| 495 |
|
|---|
| 496 | public double GetStartAngle(int index)
|
|---|
| 497 | {
|
|---|
| 498 | return ((SvgPathSeg)this[index]).StartAngle;
|
|---|
| 499 | }
|
|---|
| 500 |
|
|---|
| 501 | public double GetEndAngle(int index)
|
|---|
| 502 | {
|
|---|
| 503 | return ((SvgPathSeg)this[index]).EndAngle;
|
|---|
| 504 | }
|
|---|
| 505 |
|
|---|
| 506 | public string PathText
|
|---|
| 507 | {
|
|---|
| 508 | get
|
|---|
| 509 | {
|
|---|
| 510 | StringBuilder sb = new StringBuilder();
|
|---|
| 511 | foreach (SvgPathSeg seg in segments)
|
|---|
| 512 | {
|
|---|
| 513 | sb.Append(seg.PathText);
|
|---|
| 514 | }
|
|---|
| 515 | return sb.ToString();
|
|---|
| 516 | }
|
|---|
| 517 | }
|
|---|
| 518 |
|
|---|
| 519 | internal double GetTotalLength()
|
|---|
| 520 | {
|
|---|
| 521 | double result = 0;
|
|---|
| 522 | foreach (SvgPathSeg segment in segments)
|
|---|
| 523 | {
|
|---|
| 524 | result += segment.Length;
|
|---|
| 525 | }
|
|---|
| 526 | return result;
|
|---|
| 527 | }
|
|---|
| 528 |
|
|---|
| 529 | internal int GetPathSegAtLength(double distance)
|
|---|
| 530 | {
|
|---|
| 531 | double result = 0;
|
|---|
| 532 | foreach (SvgPathSeg segment in segments)
|
|---|
| 533 | {
|
|---|
| 534 | result += segment.Length;
|
|---|
| 535 | if (result > distance)
|
|---|
| 536 | {
|
|---|
| 537 | return segment.Index;
|
|---|
| 538 | }
|
|---|
| 539 | }
|
|---|
| 540 | // distance was to big, return last item index
|
|---|
| 541 | // TODO: is this correct?
|
|---|
| 542 | return NumberOfItems - 1;
|
|---|
| 543 | }
|
|---|
| 544 |
|
|---|
| 545 | #endregion
|
|---|
| 546 | }
|
|---|
| 547 | }
|
|---|
