1 | /*
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2 | glh - is a platform-indepenedent C++ OpenGL helper library
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3 |
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4 |
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5 | Copyright (c) 2000 Cass Everitt
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6 | Copyright (c) 2000 NVIDIA Corporation
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7 | All rights reserved.
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8 |
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9 | Redistribution and use in source and binary forms, with or
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10 | without modification, are permitted provided that the following
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11 | conditions are met:
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12 |
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13 | * Redistributions of source code must retain the above
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14 | copyright notice, this list of conditions and the following
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15 | disclaimer.
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16 |
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17 | * Redistributions in binary form must reproduce the above
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18 | copyright notice, this list of conditions and the following
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19 | disclaimer in the documentation and/or other materials
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20 | provided with the distribution.
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21 |
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22 | * The names of contributors to this software may not be used
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23 | to endorse or promote products derived from this software
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24 | without specific prior written permission.
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25 |
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26 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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27 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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28 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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29 | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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30 | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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31 | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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32 | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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33 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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34 | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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35 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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36 | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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37 | POSSIBILITY OF SUCH DAMAGE.
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38 |
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39 |
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40 | Cass Everitt - cass@r3.nu
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41 | */
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42 |
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43 | #ifndef GLH_TEXT_H
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44 | #define GLH_TEXT_H
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45 |
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46 | #include <string>
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47 |
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48 | #ifdef _WIN32
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49 | # include <windows.h>
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50 | #endif
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51 |
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52 | #ifdef MACOS
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53 | #include <OpenGL/gl.h>
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54 | #else
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55 | #include <GL/gl.h>
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56 | #endif
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57 |
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58 | #include <glh/glh_obs.h>
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59 |
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60 | namespace glh
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61 | {
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62 |
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63 | struct font
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64 | {
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65 | // build display lists and the like
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66 | virtual void initialize() = 0;
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67 | // get font metrics
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68 | virtual float get_ascent() = 0;
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69 | virtual float get_descent() = 0;
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70 | virtual float get_width(int i) = 0;
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71 |
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72 | // draw
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73 | virtual void render(int i) = 0;
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74 | };
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75 |
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76 | inline float string_width(font * f, string text)
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77 | {
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78 | float w = 0;
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79 | for(unsigned int i=0; i < text.size(); i++)
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80 | {
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81 | w += f->get_width(text[i]);
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82 | }
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83 | return w;
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84 | }
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85 | // skip a line
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86 | inline void next_line(font * f)
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87 | {
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88 | glTranslatef(0, - (f->get_ascent() + f->get_descent()), 0);
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89 | }
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90 |
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91 | // renders text horizontally
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92 | inline void render_single_line(font * f, string text)
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93 | {
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94 | glPushMatrix();
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95 | for(unsigned int i=0; i < text.size(); i++)
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96 | {
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97 | f->render(text[i]);
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98 | }
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99 | glPopMatrix();
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100 | }
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101 |
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102 |
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103 | // render text on multiple lines (based on newlines)
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104 | struct simple_multi_line_text
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105 | {
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106 | public:
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107 | simple_multi_line_text() : f(0), line_spacing(1.1f) {}
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108 |
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109 |
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110 | void render()
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111 | {
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112 | if(!f) return;
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113 | if(dirty)
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114 | {
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115 | dirty = false;
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116 | dl.new_list(GL_COMPILE);
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117 | make_render_calls();
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118 | dl.end_list();
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119 | }
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120 | dl.call_list();
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121 | }
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122 | void get_dimensions(float & width, float & height)
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123 | {
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124 | if(!f) return;
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125 | if(dirty)
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126 | {
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127 | dirty = false;
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128 | dl.new_list(GL_COMPILE);
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129 | make_render_calls();
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130 | dl.end_list();
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131 | }
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132 | width = w;
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133 | height = h;
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134 | }
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135 | void set_font(font * new_font)
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136 | {
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137 | dirty = true;
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138 | f = new_font;
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139 | }
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140 | void set_text(const string & new_text)
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141 | {
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142 | dirty = true;
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143 | text = new_text;
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144 | }
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145 | font * get_font() { return f; }
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146 | const string & get_text() { return text; }
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147 | private:
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148 | // skip a line
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149 | void next_line()
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150 | {
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151 | glTranslatef(0, - (f->get_ascent() + f->get_descent()) * line_spacing, 0);
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152 | }
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153 |
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154 | void make_render_calls()
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155 | {
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156 | w = h = 0;
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157 | float curr_width = 0;
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158 | float font_height = f->get_ascent() + f->get_descent();
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159 | int lines = 0;
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160 |
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161 | if(text.size() != 0) lines++;
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162 |
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163 | glPushMatrix(); // vertical translation
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164 | glPushMatrix(); // horizontal translation
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165 | for(unsigned int i=0; i < text.size(); i++)
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166 | {
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167 | if(text[i] == '\n')
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168 | {
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169 | lines++;
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170 | if(curr_width > w) w = curr_width;
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171 | curr_width = 0;
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172 |
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173 | glPopMatrix(); // back to beginning of line
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174 | next_line(); // translate futher down
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175 | glPushMatrix();
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176 | }
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177 | f->render(text[i]);
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178 | curr_width += f->get_width(text[i]);
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179 | }
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180 | glPopMatrix();
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181 | glPopMatrix();
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182 | if(curr_width > w) w = curr_width;
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183 | h = lines * font_height * line_spacing;
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184 | }
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185 |
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186 | font * f;
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187 | string text;
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188 | display_list dl;
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189 | float w, h;
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190 | bool dirty;
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191 | float line_spacing;
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192 | };
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193 |
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194 |
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195 | }
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196 |
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197 | #endif
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