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 @ 41645
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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 | /* CVS MESSAGES:
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25 | *
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26 | * $Id: TextPath.java 25636 2008-12-01 08:42:11Z vcaballero $
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27 | * $Log$
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28 | * Revision 1.2 2007-03-09 11:20:57 jaume
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29 | * Advanced symbology (start committing)
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30 | *
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31 | * Revision 1.1.2.3 2007/02/21 07:34:09 jaume
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32 | * labeling starts working
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33 | *
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34 | * Revision 1.1.2.2 2007/02/09 07:47:05 jaume
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35 | * Isymbol moved
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36 | *
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37 | * Revision 1.1.2.1 2007/02/06 17:01:04 jaume
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38 | * first version (only lines)
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39 | *
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40 | *
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41 | */
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42 | package org.gvsig.symbology.fmap.mapcontext.rendering.legend.styling; |
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43 | |||
44 | import java.awt.Font; |
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45 | import java.awt.Graphics2D; |
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46 | import java.awt.font.FontRenderContext; |
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47 | import java.awt.font.GlyphVector; |
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48 | import java.awt.geom.Point2D; |
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49 | |||
50 | import org.apache.batik.ext.awt.geom.PathLength; |
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51 | import org.gvsig.fmap.geom.Geometry; |
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52 | import org.gvsig.fmap.geom.Geometry.SUBTYPES; |
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53 | import org.gvsig.fmap.geom.GeometryLocator; |
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54 | import org.gvsig.fmap.geom.GeometryManager; |
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55 | import org.gvsig.fmap.geom.exception.CreateGeometryException; |
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56 | import org.gvsig.fmap.geom.primitive.GeneralPathX; |
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57 | import org.gvsig.fmap.mapcontext.rendering.symbols.ITextSymbol; |
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58 | import org.gvsig.i18n.Messages; |
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59 | import org.slf4j.Logger; |
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60 | import org.slf4j.LoggerFactory; |
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61 | |||
62 | import com.vividsolutions.jts.algorithm.Angle; |
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63 | /**
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64 | * <p>Class that represents baseline of a string and allows the baseline to
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65 | * be composed as contiguous segments with distinct slope each.<br></p>
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66 | *
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67 | * <p>Once a TextPath is created for a string it is possible to know where
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68 | * the character at a determined position in the string is placed and
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69 | * rotated.<br></p>
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70 | *
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71 | * @author jaume dominguez faus - jaume.dominguez@iver.es
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72 | *
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73 | */
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74 | public class TextPath { |
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75 | private static final GeometryManager geomManager = GeometryLocator.getGeometryManager(); |
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76 | private static final Logger logger = LoggerFactory.getLogger(GeometryManager.class); |
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77 | |||
78 | public static final int NO_POS = Integer.MIN_VALUE; |
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79 | /**
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80 | * Don't set a concrete word spacing. The word is separated using the normal
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81 | * width of the separator glyph.
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82 | */
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83 | public static final int DEFAULT_WORD_SPACING = Integer.MIN_VALUE; |
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84 | |||
85 | // private char[] text;
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86 | /**
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87 | * An array which contains the calculated positions for the glyphs
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88 | * Each row represents a glyph, and it contains the X coord, the Y coord, and the rotation angle
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89 | */
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90 | private double[][] posList; |
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91 | // private int alignment;
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92 | private float characterSpacing; |
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93 | // private boolean kerning;
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94 | private float wordSpacing; |
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95 | private float margin; |
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96 | private boolean rightToLeft; |
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97 | private int numGlyphs = 0; |
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98 | private float characterWidth; |
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99 | private char[] wordSeparators = {' '}; // in the future, separators might be provided as parameter |
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100 | |||
101 | /**
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102 | * <p>Creates a new instance of TextPath with the current graphics
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103 | * context.<br></p>
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104 | *
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105 | * <p>Given a <b>Graphics2D</b>, TextPath can know which Font and FontRenderContext
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106 | * is in use. So, it can calculate the position and rotation of each
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107 | * character in <b>char[] text</b> based in the path defined by the
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108 | * <b>FShape path</b> argument.</p>
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109 | * @param g, Graphics2D
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110 | * @param path, FShape
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111 | * @param text, char[]
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112 | */
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113 | public TextPath(Graphics2D g, Geometry path, char[] text, Font font, |
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114 | float characterSpacing, float characterWidth, boolean kerning, |
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115 | float leading, int alignment, float wordSpacing, float margin, |
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116 | boolean rightToLeft) {
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117 | // this.text = text;
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118 | if (alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_LEFT ||
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119 | alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_RIGHT |
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120 | || |
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121 | alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_CENTERED || |
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122 | alignment == ITextSymbol.SYMBOL_STYLE_ALIGNMENT_JUSTIFY) { |
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123 | // this.alignment = alignment;
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124 | } else {
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125 | throw new IllegalArgumentException( |
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126 | Messages.getText("invalid_value_for") + ": " + |
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127 | Messages.getText("alignment")+" ( "+alignment+")"); |
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128 | } |
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129 | this.characterWidth = characterWidth;
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130 | this.characterSpacing = characterSpacing;
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131 | // this.kerning = kerning;
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132 | this.wordSpacing = wordSpacing;
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133 | this.margin = margin;
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134 | this.rightToLeft = rightToLeft;
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135 | |||
136 | FontRenderContext frc = g.getFontRenderContext();
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137 | /* java 6 code
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138 | * TODO keep this!!
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139 | if (kerning) {
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140 | HashMap<TextAttribute, Object> attrs = new HashMap<TextAttribute, Object>();
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141 | attrs.put(TextAttribute.KERNING , TextAttribute.KERNING_ON);
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142 | }
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143 | */
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144 | GlyphVector gv = font.createGlyphVector(frc, text);
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145 | |||
146 | PathLength pl; |
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147 | try {
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148 | pl = new PathLength(softenShape(path, gv).getShape());
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149 | if (alignment==ITextSymbol.SYMBOL_STYLE_ALIGNMENT_RIGHT) {
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150 | posList = computeAtRight(gv, pl, text); |
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151 | } |
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152 | else if (alignment==ITextSymbol.SYMBOL_STYLE_ALIGNMENT_CENTERED) { |
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153 | computeAtMiddle(frc, text, font, pl); |
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154 | } |
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155 | else {
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156 | posList = computeAtLeft(gv, pl, text); |
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157 | } |
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158 | } catch (CreateGeometryException e) {
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159 | logger.error("Error creating a curve", e);
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160 | } |
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161 | } |
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162 | |||
163 | protected Geometry softenShape(Geometry shape, GlyphVector gv) throws CreateGeometryException { |
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164 | |||
165 | float interval = (float) gv.getVisualBounds().getWidth()/(gv.getNumGlyphs()*3); |
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166 | |||
167 | PathLength pl = new PathLength(shape.getShape());
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168 | 41645 | jjdelcerro | if (pl.lengthOfPath()==0.0f) { |
169 | return shape;
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170 | } |
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171 | |||
172 | 40435 | jjdelcerro | GeneralPathX correctedPath = new GeneralPathX();
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173 | int controlPoints = 16; |
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174 | double[][] points = new double[controlPoints][2]; |
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175 | double prevX, prevY;
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176 | double xsum=0, ysum=0; |
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177 | int nextPos = 0; |
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178 | boolean bufferComplete = false; |
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179 | boolean movedTo = false; |
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180 | for (float curPos = 0; curPos<pl.lengthOfPath(); curPos = curPos+interval) { |
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181 | prevX = points[nextPos][0];
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182 | prevY = points[nextPos][1];
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183 | Point2D point =pl.pointAtLength(curPos);
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184 | if (!movedTo) {
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185 | correctedPath.moveTo(point.getX(), point.getY()); |
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186 | movedTo = true;
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187 | } |
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188 | |||
189 | points[nextPos][0] = point.getX();
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190 | points[nextPos][1] = point.getY();
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191 | |||
192 | if (!bufferComplete) {
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193 | xsum += points[nextPos][0];
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194 | ysum += points[nextPos][1];
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195 | nextPos++; |
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196 | if (nextPos==controlPoints) {
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197 | nextPos = 0;
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198 | bufferComplete = true;
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199 | |||
200 | |||
201 | /**
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202 | * calculate the beginning of the line
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203 | */
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204 | // this will be the first interpolated point
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205 | double auxX2 = xsum/controlPoints;
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206 | double auxY2 = ysum/controlPoints;
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207 | |||
208 | for (int i=1; i<controlPoints/2-1; i++) { |
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209 | // calculate the points from the origin of the geometry to the first interpolated point
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210 | double auxX = (points[0][0]+points[i][0]+auxX2)/3; |
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211 | double auxY = (points[0][1]+points[i][1]+auxY2)/3; |
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212 | correctedPath.lineTo(auxX, auxY); |
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213 | } |
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214 | correctedPath.lineTo(auxX2, auxY2); |
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215 | } |
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216 | } |
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217 | else {
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218 | |||
219 | xsum = xsum - prevX + points[nextPos][0];
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220 | ysum = ysum - prevY + points[nextPos][1];
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221 | if (!movedTo) {
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222 | correctedPath.moveTo(xsum/controlPoints, ysum/controlPoints); |
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223 | movedTo = true;
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224 | } |
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225 | else {
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226 | correctedPath.lineTo(xsum/controlPoints, ysum/controlPoints); |
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227 | } |
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228 | |||
229 | nextPos = (nextPos+1)%controlPoints;
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230 | } |
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231 | } |
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232 | Point2D endPoint = pl.pointAtLength(pl.lengthOfPath());
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233 | // last point in the geom
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234 | double endPointX = endPoint.getX();
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235 | double endPointY = endPoint.getY();
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236 | |||
237 | if (bufferComplete) {
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238 | /**
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239 | * calculate the points from the last interpolated point to the end of the geometry
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240 | */
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241 | |||
242 | // last interpolated point
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243 | double auxX2 = xsum/controlPoints;
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244 | double auxY2 = ysum/controlPoints;
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245 | nextPos = (nextPos+(controlPoints/2))%controlPoints;
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246 | for (int i=0; i<controlPoints/2-1; i++) { |
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247 | // calculate the points from the last interpolated point to the end of the geometry
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248 | double auxX = (auxX2+points[nextPos][0]+endPointX)/3; |
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249 | double auxY = (auxY2+points[nextPos][1]+endPointY)/3; |
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250 | correctedPath.lineTo(auxX, auxY); |
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251 | nextPos = (nextPos+1)%controlPoints;
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252 | } |
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253 | } |
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254 | correctedPath.lineTo(endPointX, endPointY); |
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255 | |||
256 | return geomManager.createCurve(new GeneralPathX( |
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257 | correctedPath.getPathIterator(null)), SUBTYPES.GEOM2D);
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258 | } |
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259 | |||
260 | /**
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261 | * Initializes the position vector.
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262 | * @param g
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263 | * @param path
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264 | */
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265 | private double[][] computeAtRight(GlyphVector gv, PathLength pl, char[] text) { |
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266 | numGlyphs = gv.getNumGlyphs(); |
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267 | double[][] pos = new double[numGlyphs][3]; |
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268 | float[] charAnchors = new float[numGlyphs]; |
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269 | |||
270 | /**
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271 | * Compute glyph positions using linear distances
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272 | */
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273 | float lengthOfPath = pl.lengthOfPath();
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274 | // char distance from the right side
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275 | float charDistance = lengthOfPath-margin;
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276 | int glyphsConsumed = numGlyphs-1; |
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277 | float previousAngle = 0.0f; |
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278 | float angle = 0.0f; |
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279 | boolean correction = true; |
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280 | float charWidth = characterWidth;
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281 | for (int i = numGlyphs-1; i>=0; i--) { |
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282 | if (correction && charDistance>=0) { |
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283 | previousAngle = angle; |
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284 | angle = pl.angleAtLength(charDistance); |
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285 | if (i<numGlyphs-1) { |
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286 | // correct distance according to angle between current and previous glyph
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287 | int turn = Angle.getTurn(previousAngle, angle);
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288 | if (turn==1) { // if turn is positive => increase distance |
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289 | float auxDistance = charDistance - (float)(charWidth*2.5f*Angle.diff(previousAngle, angle)/Math.PI); |
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290 | float auxAngle = pl.angleAtLength(auxDistance);
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291 | if (Angle.getTurn(previousAngle, auxAngle)==1) { // ensure new position also has positive turn |
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292 | charDistance = auxDistance; |
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293 | angle = auxAngle; |
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294 | } |
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295 | } |
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296 | else if (turn==-1) { // if turn is negative => decrease distance |
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297 | float auxDistance = charDistance + (float)(charWidth*0.9f*Angle.diff(previousAngle, angle)/Math.PI); |
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298 | float auxAngle = pl.angleAtLength(auxDistance);
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299 | if (Angle.getTurn(previousAngle, auxAngle)==-1) { // ensure new position also has negative turn |
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300 | charDistance = auxDistance; |
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301 | angle = auxAngle; |
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302 | } |
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303 | } |
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304 | } |
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305 | } |
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306 | |||
307 | if (wordSpacing!=DEFAULT_WORD_SPACING
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308 | && isWordSeparator(text[gv.getGlyphCharIndex(glyphsConsumed)], wordSeparators)) { |
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309 | charWidth = wordSpacing; |
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310 | } |
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311 | else {
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312 | charWidth = Math.max(gv.getGlyphMetrics(glyphsConsumed).getAdvance(), characterWidth);
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313 | |||
314 | } |
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315 | charDistance -= charWidth; |
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316 | charAnchors[glyphsConsumed] = charDistance; |
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317 | charDistance -= characterSpacing; |
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318 | glyphsConsumed--; |
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319 | } |
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320 | |||
321 | /**
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322 | * Calculate 2D positions for the glyphs from the calculated linear distances
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323 | */
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324 | for (int i = numGlyphs-1; i>=0; i--) { |
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325 | float anchor = (rightToLeft) ? charAnchors[charAnchors.length-1-i] : charAnchors[i]; |
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326 | Point2D p = pl.pointAtLength( anchor );
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327 | if (p == null) { |
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328 | if (i<numGlyphs-1) { // place in a straight line the glyphs that don't fit in the shape |
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329 | pos[i][0] = pos[i+1][0] + (charAnchors[i]-charAnchors[i+1])*Math.cos(pos[i+1][2]); |
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330 | pos[i][1] = pos[i+1][1] + (charAnchors[i]-charAnchors[i+1])*Math.sin(pos[i+1][2]); |
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331 | pos[i][2] = pos[i+1][2]; |
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332 | } else {
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333 | pos[i][0] = NO_POS;
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334 | pos[i][1] = NO_POS;
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335 | } |
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336 | continue;
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337 | } |
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338 | pos[i][0] = p.getX();
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339 | pos[i][1] = p.getY();
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340 | pos[i][2] = pl.angleAtLength( anchor );
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341 | } |
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342 | return pos;
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343 | } |
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344 | |||
345 | /**
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346 | * Initializes the position vector.
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347 | * @param g
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348 | * @param path
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349 | */
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350 | private double[][] computeAtLeft(GlyphVector gv, PathLength pl, char[] text) { |
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351 | numGlyphs = gv.getNumGlyphs(); |
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352 | double[][] pos = new double[numGlyphs][3]; |
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353 | float[] charAnchors = new float[numGlyphs]; |
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354 | float[] charWidths = new float[numGlyphs]; |
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355 | |||
356 | /**
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357 | * Compute glyph positions using linear distances
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358 | */
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359 | float lengthOfPath = pl.lengthOfPath();
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360 | float charDistance = margin;
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361 | int glyphsConsumed = 0; |
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362 | float previousAngle = 0.0f; |
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363 | float angle = 0.0f; |
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364 | boolean correction = true; |
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365 | float charWidth = characterWidth;
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366 | for (int i = 0; i < gv.getNumGlyphs(); i++) { |
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367 | |||
368 | if (correction && charDistance<=lengthOfPath) {
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369 | previousAngle = angle; |
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370 | angle = pl.angleAtLength(charDistance); |
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371 | if (i>0) { |
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372 | // correct distance according to angle between current and previous glyph
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373 | int turn = Angle.getTurn(previousAngle, angle);
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374 | if (turn==1) { // if turn is positive => decrease distance |
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375 | float auxDistance = charDistance - (float)(charWidth*0.9*Angle.diff(previousAngle, angle)/Math.PI); |
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376 | float auxAngle = pl.angleAtLength(auxDistance);
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377 | if (Angle.getTurn(previousAngle, auxAngle)==1) { // ensure new position also has positive turn |
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378 | charDistance = auxDistance; |
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379 | angle = auxAngle; |
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380 | } |
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381 | } |
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382 | else if (turn == -1){ // if turn is negative => increase distance |
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383 | |||
384 | float auxDistance = charDistance + (float)(charWidth*2.5*Angle.diff(previousAngle, angle)/Math.PI); |
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385 | float auxAngle = pl.angleAtLength(auxDistance);
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386 | if (Angle.getTurn(previousAngle, auxAngle)==-1) { // ensure new position also has negative turn |
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387 | charDistance = auxDistance; |
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388 | angle = auxAngle; |
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389 | } |
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390 | } |
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391 | } |
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392 | } |
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393 | if (wordSpacing!=DEFAULT_WORD_SPACING
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394 | && isWordSeparator(text[gv.getGlyphCharIndex(glyphsConsumed)], wordSeparators)) { |
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395 | // use defined wordspacing
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396 | charWidth = wordSpacing; |
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397 | } |
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398 | else {
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399 | charWidth = Math.max(gv.getGlyphMetrics(glyphsConsumed).getAdvance(), characterWidth);
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400 | |||
401 | } |
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402 | charWidths[glyphsConsumed] = charWidth; |
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403 | charAnchors[glyphsConsumed] = charDistance; |
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404 | charDistance += charWidth; |
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405 | charDistance += characterSpacing; |
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406 | glyphsConsumed++; |
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407 | } |
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408 | |||
409 | /**
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410 | * Calculate 2D positions for the glyphs from the calculated linear distances
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411 | */
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412 | for (int i = 0; i < charAnchors.length; i++) { |
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413 | float anchor = (rightToLeft) ? charAnchors[charAnchors.length-1-i] : charAnchors[i]; |
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414 | Point2D p = pl.pointAtLength( anchor );
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415 | if (p == null) { |
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416 | if (i>0) { // place in a straight line the glyphs that don't fit in the shape |
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417 | pos[i][0] = pos[i-1][0] + (charAnchors[i]-charAnchors[i-1])*Math.cos(pos[i-1][2]); |
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418 | pos[i][1] = pos[i-1][1] + (charAnchors[i]-charAnchors[i-1])*Math.sin(pos[i-1][2]); |
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419 | pos[i][2] = pos[i-1][2]; |
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420 | } else {
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421 | pos[i][0] = NO_POS;
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422 | pos[i][1] = NO_POS;
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423 | } |
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424 | continue;
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425 | } |
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426 | pos[i][2] = pl.angleAtLength( anchor );
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427 | // pos[i][0] = p.getX() - charWidths[i]*Math.cos(pos[i][2]);
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428 | // pos[i][1] = p.getY() - charWidths[i]*Math.sin(pos[i][2]);
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429 | pos[i][0] = p.getX();
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430 | pos[i][1] = p.getY();
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431 | } |
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432 | return pos;
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433 | } |
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434 | |||
435 | |||
436 | /**
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437 | * Initializes the position vector.
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438 | * @param g
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439 | * @param path
|
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440 | */
|
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441 | private void computeAtMiddle(FontRenderContext frc, char[] text, Font font, PathLength pl) { |
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442 | if (text.length==0) { |
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443 | return; // nothing to compute if text length is 0 |
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444 | } |
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445 | int middleChar = (text.length-1)/2; |
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446 | char[] text1 = new char[middleChar+1]; |
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447 | char[] text2 = new char[text.length-text1.length]; |
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448 | System.arraycopy(text, 0, text1, 0, text1.length); |
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449 | System.arraycopy(text, text1.length, text2, 0, text2.length); |
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450 | |||
451 | float halfLength = pl.lengthOfPath()/2.0f; |
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452 | margin = halfLength; |
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453 | GlyphVector gv = font.createGlyphVector(frc, text1);
|
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454 | double[][] pos1 = computeAtRight(gv, pl, text1); |
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455 | int glyphCount = numGlyphs;
|
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456 | gv = font.createGlyphVector(frc, text2); |
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457 | margin = halfLength + characterSpacing; |
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458 | double[][] pos2 = computeAtLeft(gv, pl, text2); |
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459 | numGlyphs += glyphCount; |
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460 | posList = new double[pos1.length+pos2.length][3]; |
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461 | System.arraycopy(pos1, 0, posList, 0, pos1.length); |
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462 | System.arraycopy(pos2, 0, posList, pos1.length, pos2.length); |
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463 | } |
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464 | |||
465 | |||
466 | /**
|
||
467 | * <p>Returns the placement of the next character to draw and the corresponding
|
||
468 | * rotation in a double array of three elements with this order:</p><br>
|
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469 | *
|
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470 | * <p><b>double[0]</b> Position in X in the screen</p>
|
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471 | * <p><b>double[1]</b> Position in Y in the screen</p>
|
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472 | * <p><b>double[2]</b> Angle of the character.</p>
|
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473 | * @return
|
||
474 | */
|
||
475 | public double[] nextPosForGlyph(int glyphIndex) { |
||
476 | return posList[glyphIndex];
|
||
477 | } |
||
478 | |||
479 | public int getGlyphCount() { |
||
480 | return numGlyphs;
|
||
481 | } |
||
482 | |||
483 | protected static boolean isWordSeparator(char c, char[] wordSeparators) { |
||
484 | char separator;
|
||
485 | for (int i = 0; i < wordSeparators.length; i++) { |
||
486 | separator = wordSeparators[i]; |
||
487 | if (c==separator) {
|
||
488 | return true; |
||
489 | } |
||
490 | } |
||
491 | return false; |
||
492 | } |
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493 | |||
494 | } |