svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.symbology / org.gvsig.symbology.lib / org.gvsig.symbology.lib.impl / src / main / java / org / gvsig / symbology / fmap / mapcontext / rendering / legend / styling / TextPath.java @ 43156
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1 | 40560 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | 40435 | jjdelcerro | *
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4 | 40560 | jjdelcerro | * Copyright (C) 2007-2013 gvSIG Association.
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5 | 40435 | jjdelcerro | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | 40560 | jjdelcerro | * as published by the Free Software Foundation; either version 3
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9 | 40435 | jjdelcerro | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | 40560 | jjdelcerro | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | 40435 | jjdelcerro | *
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21 | 40560 | jjdelcerro | * For any additional information, do not hesitate to contact us
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22 | * at info AT gvsig.com, or visit our website www.gvsig.com.
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23 | 40435 | jjdelcerro | */
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24 | package org.gvsig.symbology.fmap.mapcontext.rendering.legend.styling; |
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25 | |||
26 | import java.awt.Font; |
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27 | import java.awt.Graphics2D; |
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28 | import java.awt.font.FontRenderContext; |
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29 | import java.awt.font.GlyphVector; |
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30 | import java.awt.geom.Point2D; |
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31 | |||
32 | 43156 | jjdelcerro | import org.apache.batik.ext.awt.geom.DefaultPathLength; |
33 | 40435 | jjdelcerro | import org.gvsig.fmap.geom.Geometry; |
34 | import org.gvsig.fmap.geom.Geometry.SUBTYPES; |
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35 | import org.gvsig.fmap.geom.GeometryLocator; |
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36 | import org.gvsig.fmap.geom.GeometryManager; |
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37 | import org.gvsig.fmap.geom.exception.CreateGeometryException; |
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38 | import org.gvsig.fmap.geom.primitive.GeneralPathX; |
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39 | import org.gvsig.fmap.mapcontext.rendering.symbols.ITextSymbol; |
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40 | import org.gvsig.i18n.Messages; |
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41 | import org.slf4j.Logger; |
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42 | import org.slf4j.LoggerFactory; |
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43 | |||
44 | import com.vividsolutions.jts.algorithm.Angle; |
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45 | 43156 | jjdelcerro | import org.gvsig.symbology.PathLength; |
46 | 40435 | jjdelcerro | /**
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47 | * <p>Class that represents baseline of a string and allows the baseline to
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48 | * be composed as contiguous segments with distinct slope each.<br></p>
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49 | *
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50 | * <p>Once a TextPath is created for a string it is possible to know where
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51 | * the character at a determined position in the string is placed and
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52 | * rotated.<br></p>
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53 | *
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54 | */
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55 | public class TextPath { |
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56 | private static final GeometryManager geomManager = GeometryLocator.getGeometryManager(); |
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57 | private static final Logger logger = LoggerFactory.getLogger(GeometryManager.class); |
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58 | |||
59 | public static final int NO_POS = Integer.MIN_VALUE; |
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60 | /**
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61 | * Don't set a concrete word spacing. The word is separated using the normal
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62 | * width of the separator glyph.
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63 | */
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64 | public static final int DEFAULT_WORD_SPACING = Integer.MIN_VALUE; |
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65 | |||
66 | // private char[] text;
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67 | /**
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68 | * An array which contains the calculated positions for the glyphs
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69 | * Each row represents a glyph, and it contains the X coord, the Y coord, and the rotation angle
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70 | */
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71 | private double[][] posList; |
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72 | // private int alignment;
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73 | private float characterSpacing; |
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74 | // private boolean kerning;
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75 | private float wordSpacing; |
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76 | private float margin; |
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77 | private boolean rightToLeft; |
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78 | private int numGlyphs = 0; |
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79 | private float characterWidth; |
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80 | private char[] wordSeparators = {' '}; // in the future, separators might be provided as parameter |
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81 | |||
82 | /**
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83 | * <p>Creates a new instance of TextPath with the current graphics
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84 | * context.<br></p>
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85 | *
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86 | * <p>Given a <b>Graphics2D</b>, TextPath can know which Font and FontRenderContext
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87 | * is in use. So, it can calculate the position and rotation of each
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88 | * character in <b>char[] text</b> based in the path defined by the
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89 | * <b>FShape path</b> argument.</p>
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90 | * @param g, Graphics2D
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91 | * @param path, FShape
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92 | * @param text, char[]
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93 | */
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94 | public TextPath(Graphics2D g, Geometry path, char[] text, Font font, |
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95 | float characterSpacing, float characterWidth, boolean kerning, |
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96 | float leading, int alignment, float wordSpacing, float margin, |
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97 | boolean rightToLeft) {
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98 | // this.text = text;
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99 | if (alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_LEFT ||
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100 | alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_RIGHT |
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101 | || |
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102 | alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_CENTERED || |
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103 | alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_JUSTIFY) { |
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104 | // this.alignment = alignment;
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105 | } else {
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106 | throw new IllegalArgumentException( |
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107 | Messages.getText("invalid_value_for") + ": " + |
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108 | Messages.getText("alignment")+" ( "+alignment+")"); |
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109 | } |
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110 | this.characterWidth = characterWidth;
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111 | this.characterSpacing = characterSpacing;
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112 | // this.kerning = kerning;
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113 | this.wordSpacing = wordSpacing;
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114 | this.margin = margin;
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115 | this.rightToLeft = rightToLeft;
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116 | |||
117 | FontRenderContext frc = g.getFontRenderContext();
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118 | /* java 6 code
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119 | * TODO keep this!!
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120 | if (kerning) {
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121 | HashMap<TextAttribute, Object> attrs = new HashMap<TextAttribute, Object>();
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122 | attrs.put(TextAttribute.KERNING , TextAttribute.KERNING_ON);
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123 | }
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124 | */
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125 | GlyphVector gv = font.createGlyphVector(frc, text);
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126 | |||
127 | PathLength pl; |
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128 | try {
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129 | 43156 | jjdelcerro | pl = new DefaultPathLength(softenShape(path, gv).getShape());
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130 | 40435 | jjdelcerro | if (alignment==ITextSymbol.SYMBOL_STYLE_ALIGNMENT_RIGHT) {
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131 | posList = computeAtRight(gv, pl, text); |
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132 | } |
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133 | else if (alignment==ITextSymbol.SYMBOL_STYLE_ALIGNMENT_CENTERED) { |
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134 | computeAtMiddle(frc, text, font, pl); |
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135 | } |
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136 | else {
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137 | posList = computeAtLeft(gv, pl, text); |
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138 | } |
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139 | } catch (CreateGeometryException e) {
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140 | logger.error("Error creating a curve", e);
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141 | } |
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142 | } |
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143 | |||
144 | protected Geometry softenShape(Geometry shape, GlyphVector gv) throws CreateGeometryException { |
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145 | |||
146 | float interval = (float) gv.getVisualBounds().getWidth()/(gv.getNumGlyphs()*3); |
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147 | |||
148 | 43156 | jjdelcerro | PathLength pl = new DefaultPathLength(shape.getShape());
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149 | 41645 | jjdelcerro | if (pl.lengthOfPath()==0.0f) { |
150 | return shape;
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151 | } |
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152 | |||
153 | 40435 | jjdelcerro | GeneralPathX correctedPath = new GeneralPathX();
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154 | int controlPoints = 16; |
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155 | double[][] points = new double[controlPoints][2]; |
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156 | double prevX, prevY;
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157 | double xsum=0, ysum=0; |
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158 | int nextPos = 0; |
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159 | boolean bufferComplete = false; |
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160 | boolean movedTo = false; |
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161 | for (float curPos = 0; curPos<pl.lengthOfPath(); curPos = curPos+interval) { |
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162 | prevX = points[nextPos][0];
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163 | prevY = points[nextPos][1];
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164 | Point2D point =pl.pointAtLength(curPos);
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165 | if (!movedTo) {
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166 | correctedPath.moveTo(point.getX(), point.getY()); |
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167 | movedTo = true;
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168 | } |
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169 | |||
170 | points[nextPos][0] = point.getX();
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171 | points[nextPos][1] = point.getY();
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172 | |||
173 | if (!bufferComplete) {
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174 | xsum += points[nextPos][0];
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175 | ysum += points[nextPos][1];
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176 | nextPos++; |
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177 | if (nextPos==controlPoints) {
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178 | nextPos = 0;
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179 | bufferComplete = true;
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180 | |||
181 | |||
182 | /**
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183 | * calculate the beginning of the line
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184 | */
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185 | // this will be the first interpolated point
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186 | double auxX2 = xsum/controlPoints;
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187 | double auxY2 = ysum/controlPoints;
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188 | |||
189 | for (int i=1; i<controlPoints/2-1; i++) { |
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190 | // calculate the points from the origin of the geometry to the first interpolated point
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191 | double auxX = (points[0][0]+points[i][0]+auxX2)/3; |
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192 | double auxY = (points[0][1]+points[i][1]+auxY2)/3; |
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193 | correctedPath.lineTo(auxX, auxY); |
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194 | } |
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195 | correctedPath.lineTo(auxX2, auxY2); |
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196 | } |
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197 | } |
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198 | else {
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199 | |||
200 | xsum = xsum - prevX + points[nextPos][0];
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201 | ysum = ysum - prevY + points[nextPos][1];
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202 | if (!movedTo) {
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203 | correctedPath.moveTo(xsum/controlPoints, ysum/controlPoints); |
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204 | movedTo = true;
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205 | } |
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206 | else {
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207 | correctedPath.lineTo(xsum/controlPoints, ysum/controlPoints); |
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208 | } |
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209 | |||
210 | nextPos = (nextPos+1)%controlPoints;
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211 | } |
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212 | } |
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213 | Point2D endPoint = pl.pointAtLength(pl.lengthOfPath());
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214 | // last point in the geom
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215 | double endPointX = endPoint.getX();
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216 | double endPointY = endPoint.getY();
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217 | |||
218 | if (bufferComplete) {
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219 | /**
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220 | * calculate the points from the last interpolated point to the end of the geometry
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221 | */
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222 | |||
223 | // last interpolated point
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224 | double auxX2 = xsum/controlPoints;
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225 | double auxY2 = ysum/controlPoints;
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226 | nextPos = (nextPos+(controlPoints/2))%controlPoints;
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227 | for (int i=0; i<controlPoints/2-1; i++) { |
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228 | // calculate the points from the last interpolated point to the end of the geometry
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229 | double auxX = (auxX2+points[nextPos][0]+endPointX)/3; |
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230 | double auxY = (auxY2+points[nextPos][1]+endPointY)/3; |
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231 | correctedPath.lineTo(auxX, auxY); |
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232 | nextPos = (nextPos+1)%controlPoints;
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233 | } |
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234 | } |
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235 | correctedPath.lineTo(endPointX, endPointY); |
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236 | |||
237 | return geomManager.createCurve(new GeneralPathX( |
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238 | correctedPath.getPathIterator(null)), SUBTYPES.GEOM2D);
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239 | } |
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240 | |||
241 | /**
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242 | * Initializes the position vector.
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243 | * @param g
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244 | * @param path
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245 | */
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246 | private double[][] computeAtRight(GlyphVector gv, PathLength pl, char[] text) { |
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247 | numGlyphs = gv.getNumGlyphs(); |
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248 | double[][] pos = new double[numGlyphs][3]; |
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249 | float[] charAnchors = new float[numGlyphs]; |
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250 | |||
251 | /**
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252 | * Compute glyph positions using linear distances
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253 | */
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254 | float lengthOfPath = pl.lengthOfPath();
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255 | // char distance from the right side
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256 | float charDistance = lengthOfPath-margin;
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257 | int glyphsConsumed = numGlyphs-1; |
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258 | float previousAngle = 0.0f; |
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259 | float angle = 0.0f; |
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260 | boolean correction = true; |
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261 | float charWidth = characterWidth;
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262 | for (int i = numGlyphs-1; i>=0; i--) { |
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263 | if (correction && charDistance>=0) { |
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264 | previousAngle = angle; |
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265 | angle = pl.angleAtLength(charDistance); |
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266 | if (i<numGlyphs-1) { |
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267 | // correct distance according to angle between current and previous glyph
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268 | int turn = Angle.getTurn(previousAngle, angle);
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269 | if (turn==1) { // if turn is positive => increase distance |
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270 | float auxDistance = charDistance - (float)(charWidth*2.5f*Angle.diff(previousAngle, angle)/Math.PI); |
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271 | float auxAngle = pl.angleAtLength(auxDistance);
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272 | if (Angle.getTurn(previousAngle, auxAngle)==1) { // ensure new position also has positive turn |
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273 | charDistance = auxDistance; |
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274 | angle = auxAngle; |
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275 | } |
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276 | } |
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277 | else if (turn==-1) { // if turn is negative => decrease distance |
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278 | float auxDistance = charDistance + (float)(charWidth*0.9f*Angle.diff(previousAngle, angle)/Math.PI); |
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279 | float auxAngle = pl.angleAtLength(auxDistance);
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280 | if (Angle.getTurn(previousAngle, auxAngle)==-1) { // ensure new position also has negative turn |
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281 | charDistance = auxDistance; |
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282 | angle = auxAngle; |
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283 | } |
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284 | } |
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285 | } |
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286 | } |
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287 | |||
288 | if (wordSpacing!=DEFAULT_WORD_SPACING
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289 | && isWordSeparator(text[gv.getGlyphCharIndex(glyphsConsumed)], wordSeparators)) { |
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290 | charWidth = wordSpacing; |
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291 | } |
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292 | else {
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293 | charWidth = Math.max(gv.getGlyphMetrics(glyphsConsumed).getAdvance(), characterWidth);
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294 | |||
295 | } |
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296 | charDistance -= charWidth; |
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297 | charAnchors[glyphsConsumed] = charDistance; |
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298 | charDistance -= characterSpacing; |
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299 | glyphsConsumed--; |
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300 | } |
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301 | |||
302 | /**
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303 | * Calculate 2D positions for the glyphs from the calculated linear distances
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304 | */
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305 | for (int i = numGlyphs-1; i>=0; i--) { |
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306 | float anchor = (rightToLeft) ? charAnchors[charAnchors.length-1-i] : charAnchors[i]; |
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307 | Point2D p = pl.pointAtLength( anchor );
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308 | if (p == null) { |
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309 | if (i<numGlyphs-1) { // place in a straight line the glyphs that don't fit in the shape |
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310 | pos[i][0] = pos[i+1][0] + (charAnchors[i]-charAnchors[i+1])*Math.cos(pos[i+1][2]); |
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311 | pos[i][1] = pos[i+1][1] + (charAnchors[i]-charAnchors[i+1])*Math.sin(pos[i+1][2]); |
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312 | pos[i][2] = pos[i+1][2]; |
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313 | } else {
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314 | pos[i][0] = NO_POS;
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315 | pos[i][1] = NO_POS;
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316 | } |
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317 | continue;
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318 | } |
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319 | pos[i][0] = p.getX();
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320 | pos[i][1] = p.getY();
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321 | pos[i][2] = pl.angleAtLength( anchor );
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322 | } |
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323 | return pos;
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324 | } |
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325 | |||
326 | /**
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327 | * Initializes the position vector.
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328 | * @param g
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329 | * @param path
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330 | */
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331 | private double[][] computeAtLeft(GlyphVector gv, PathLength pl, char[] text) { |
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332 | numGlyphs = gv.getNumGlyphs(); |
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333 | double[][] pos = new double[numGlyphs][3]; |
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334 | float[] charAnchors = new float[numGlyphs]; |
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335 | float[] charWidths = new float[numGlyphs]; |
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336 | |||
337 | /**
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338 | * Compute glyph positions using linear distances
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339 | */
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340 | float lengthOfPath = pl.lengthOfPath();
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341 | float charDistance = margin;
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342 | int glyphsConsumed = 0; |
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343 | float previousAngle = 0.0f; |
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344 | float angle = 0.0f; |
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345 | boolean correction = true; |
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346 | float charWidth = characterWidth;
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347 | for (int i = 0; i < gv.getNumGlyphs(); i++) { |
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348 | |||
349 | if (correction && charDistance<=lengthOfPath) {
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350 | previousAngle = angle; |
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351 | angle = pl.angleAtLength(charDistance); |
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352 | if (i>0) { |
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353 | // correct distance according to angle between current and previous glyph
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354 | int turn = Angle.getTurn(previousAngle, angle);
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355 | if (turn==1) { // if turn is positive => decrease distance |
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356 | float auxDistance = charDistance - (float)(charWidth*0.9*Angle.diff(previousAngle, angle)/Math.PI); |
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357 | float auxAngle = pl.angleAtLength(auxDistance);
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358 | if (Angle.getTurn(previousAngle, auxAngle)==1) { // ensure new position also has positive turn |
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359 | charDistance = auxDistance; |
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360 | angle = auxAngle; |
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361 | } |
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362 | } |
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363 | else if (turn == -1){ // if turn is negative => increase distance |
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364 | |||
365 | float auxDistance = charDistance + (float)(charWidth*2.5*Angle.diff(previousAngle, angle)/Math.PI); |
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366 | float auxAngle = pl.angleAtLength(auxDistance);
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367 | if (Angle.getTurn(previousAngle, auxAngle)==-1) { // ensure new position also has negative turn |
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368 | charDistance = auxDistance; |
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369 | angle = auxAngle; |
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370 | } |
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371 | } |
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372 | } |
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373 | } |
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374 | if (wordSpacing!=DEFAULT_WORD_SPACING
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375 | && isWordSeparator(text[gv.getGlyphCharIndex(glyphsConsumed)], wordSeparators)) { |
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376 | // use defined wordspacing
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377 | charWidth = wordSpacing; |
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378 | } |
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379 | else {
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380 | charWidth = Math.max(gv.getGlyphMetrics(glyphsConsumed).getAdvance(), characterWidth);
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381 | |||
382 | } |
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383 | charWidths[glyphsConsumed] = charWidth; |
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384 | charAnchors[glyphsConsumed] = charDistance; |
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385 | charDistance += charWidth; |
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386 | charDistance += characterSpacing; |
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387 | glyphsConsumed++; |
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388 | } |
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389 | |||
390 | /**
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391 | * Calculate 2D positions for the glyphs from the calculated linear distances
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392 | */
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393 | for (int i = 0; i < charAnchors.length; i++) { |
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394 | float anchor = (rightToLeft) ? charAnchors[charAnchors.length-1-i] : charAnchors[i]; |
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395 | Point2D p = pl.pointAtLength( anchor );
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396 | if (p == null) { |
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397 | if (i>0) { // place in a straight line the glyphs that don't fit in the shape |
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398 | pos[i][0] = pos[i-1][0] + (charAnchors[i]-charAnchors[i-1])*Math.cos(pos[i-1][2]); |
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399 | pos[i][1] = pos[i-1][1] + (charAnchors[i]-charAnchors[i-1])*Math.sin(pos[i-1][2]); |
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400 | pos[i][2] = pos[i-1][2]; |
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401 | } else {
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402 | pos[i][0] = NO_POS;
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403 | pos[i][1] = NO_POS;
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404 | } |
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405 | continue;
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406 | } |
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407 | pos[i][2] = pl.angleAtLength( anchor );
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408 | // pos[i][0] = p.getX() - charWidths[i]*Math.cos(pos[i][2]);
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409 | // pos[i][1] = p.getY() - charWidths[i]*Math.sin(pos[i][2]);
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410 | pos[i][0] = p.getX();
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411 | pos[i][1] = p.getY();
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412 | } |
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413 | return pos;
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414 | } |
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415 | |||
416 | |||
417 | /**
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418 | * Initializes the position vector.
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419 | * @param g
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420 | * @param path
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421 | */
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422 | private void computeAtMiddle(FontRenderContext frc, char[] text, Font font, PathLength pl) { |
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423 | if (text.length==0) { |
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424 | return; // nothing to compute if text length is 0 |
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425 | } |
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426 | int middleChar = (text.length-1)/2; |
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427 | char[] text1 = new char[middleChar+1]; |
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428 | char[] text2 = new char[text.length-text1.length]; |
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429 | System.arraycopy(text, 0, text1, 0, text1.length); |
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430 | System.arraycopy(text, text1.length, text2, 0, text2.length); |
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431 | |||
432 | float halfLength = pl.lengthOfPath()/2.0f; |
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433 | margin = halfLength; |
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434 | GlyphVector gv = font.createGlyphVector(frc, text1);
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435 | double[][] pos1 = computeAtRight(gv, pl, text1); |
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436 | int glyphCount = numGlyphs;
|
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437 | gv = font.createGlyphVector(frc, text2); |
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438 | margin = halfLength + characterSpacing; |
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439 | double[][] pos2 = computeAtLeft(gv, pl, text2); |
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440 | numGlyphs += glyphCount; |
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441 | posList = new double[pos1.length+pos2.length][3]; |
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442 | System.arraycopy(pos1, 0, posList, 0, pos1.length); |
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443 | System.arraycopy(pos2, 0, posList, pos1.length, pos2.length); |
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444 | } |
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445 | |||
446 | |||
447 | /**
|
||
448 | * <p>Returns the placement of the next character to draw and the corresponding
|
||
449 | * rotation in a double array of three elements with this order:</p><br>
|
||
450 | *
|
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451 | * <p><b>double[0]</b> Position in X in the screen</p>
|
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452 | * <p><b>double[1]</b> Position in Y in the screen</p>
|
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453 | * <p><b>double[2]</b> Angle of the character.</p>
|
||
454 | * @return
|
||
455 | */
|
||
456 | public double[] nextPosForGlyph(int glyphIndex) { |
||
457 | return posList[glyphIndex];
|
||
458 | } |
||
459 | |||
460 | public int getGlyphCount() { |
||
461 | return numGlyphs;
|
||
462 | } |
||
463 | |||
464 | protected static boolean isWordSeparator(char c, char[] wordSeparators) { |
||
465 | char separator;
|
||
466 | for (int i = 0; i < wordSeparators.length; i++) { |
||
467 | separator = wordSeparators[i]; |
||
468 | if (c==separator) {
|
||
469 | return true; |
||
470 | } |
||
471 | } |
||
472 | return false; |
||
473 | } |
||
474 | |||
475 | } |