[852] | 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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