demos/c_simple/textaligntest.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2010 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2014 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include <stdio.h>
  27 #include <GP.h>
  28
  29 static GP_Pixel black_pixel, red_pixel, yellow_pixel, green_pixel, blue_pixel,
  30                 darkgray_pixel, white_pixel;
  31
  32 static int font_flag = 0;
  33
  34 static int X = 640;
  35 static int Y = 480;
  36
  37 static GP_FontFace *font = NULL;
  38 static GP_TextStyle style = GP_DEFAULT_TEXT_STYLE;
  39
  40 static GP_Backend *win;
  41
  42 void redraw_screen(void)
  43 {
  44         GP_Fill(win->context, black_pixel);
  45
  46         /* draw axes intersecting in the middle, where text should be shown */
  47         GP_HLine(win->context, 0, X, Y/2, darkgray_pixel);
  48         GP_VLine(win->context, X/2, 0, Y, darkgray_pixel);
  49
  50         switch (font_flag) {
  51         case 0:
  52                 style.font = &GP_DefaultProportionalFont;
  53         break;
  54         case 1:
  55                 style.font = &GP_DefaultConsoleFont;
  56         break;
  57         case 2:
  58                 style.font = GP_FontTinyMono;
  59         break;
  60         case 3:
  61                 style.font = GP_FontTiny;
  62         break;
  63         case 4:
  64                 style.font = GP_FontC64;
  65         break;
  66         case 5:
  67                 style.font = font;
  68         break;
  69         }
  70
  71         GP_Text(win->context, &style, X/2, Y/2, GP_ALIGN_LEFT|GP_VALIGN_BELOW,
  72                 yellow_pixel, black_pixel, "bottom left");
  73         GP_Text(win->context, &style, X/2, Y/2, GP_ALIGN_RIGHT|GP_VALIGN_BELOW,
  74                 red_pixel, black_pixel, "bottom right");
  75         GP_Text(win->context, &style, X/2, Y/2, GP_ALIGN_RIGHT|GP_VALIGN_ABOVE,
  76                 blue_pixel, black_pixel, "top right");
  77         GP_Text(win->context, &style, X/2, Y/2, GP_ALIGN_LEFT|GP_VALIGN_ABOVE,
  78                 green_pixel, black_pixel, "top left");
  79
  80         GP_HLine(win->context, 0, X, Y/3, darkgray_pixel);
  81         GP_Text(win->context, &style, X/2, Y/3, GP_ALIGN_CENTER|GP_VALIGN_BASELINE,
  82                 white_pixel, black_pixel, "x center y baseline");
  83 }
  84
  85 static void event_loop(void)
  86 {
  87         GP_Event ev;
  88
  89         for (;;) {
  90                 GP_BackendWaitEvent(win, &ev);
  91
  92                 switch (ev.type) {
  93                 case GP_EV_KEY:
  94                         if (ev.code != GP_EV_KEY_DOWN)
  95                                 continue;
  96
  97                         switch (ev.val.key.key) {
  98                         case GP_KEY_X:
  99                                 win->context->x_swap = !win->context->x_swap;
 100                         break;
 101                         case GP_KEY_Y:
 102                                 win->context->y_swap = !win->context->y_swap;
 103                         break;
 104                         case GP_KEY_R:
 105                                 win->context->axes_swap = !win->context->axes_swap;
 106                                 GP_SWAP(X, Y);
 107                         break;
 108                         case GP_KEY_SPACE:
 109                                 font_flag++;
 110
 111                                 if (font) {
 112                                         if (font_flag > 5)
 113                                                 font_flag = 0;
 114                                 } else {
 115                                         if (font_flag > 4)
 116                                                 font_flag = 0;
 117                                 }
 118                         break;
 119                         case GP_KEY_UP:
 120                                 style.pixel_xspace++;
 121                                 style.pixel_yspace++;
 122                         break;
 123                         case GP_KEY_DOWN:
 124                                 style.pixel_xspace--;
 125                                 style.pixel_yspace--;
 126                         break;
 127                         case GP_KEY_RIGHT:
 128                                 style.pixel_xmul++;
 129                                 style.pixel_ymul++;
 130                         break;
 131                         case GP_KEY_LEFT:
 132                                 style.pixel_xmul--;
 133                                 style.pixel_ymul--;
 134                         break;
 135                         case GP_KEY_ESC:
 136                                 GP_BackendExit(win);
 137                                 exit(0);
 138                         break;
 139                         }
 140                 break;
 141                 case GP_EV_SYS:
 142                         switch(ev.code) {
 143                         case GP_EV_SYS_QUIT:
 144                                 GP_BackendExit(win);
 145                                 exit(0);
 146                         break;
 147                         }
 148                 break;
 149                 }
 150
 151                 redraw_screen();
 152                 GP_BackendFlip(win);
 153         }
 154 }
 155
 156 void print_instructions(void)
 157 {
 158         printf("Use the following keys to control the test:\n");
 159         printf("    Space ........ toggle font\n");
 160         printf("    X ............ mirror X\n");
 161         printf("    Y ............ mirror Y\n");
 162         printf("    R ............ reverse X and Y\n");
 163         printf("    UP/DOWN ...... increase/decrease X and Y space\n");
 164         printf("    RIGHT/LEFT ... increase/decrease X and Y mul\n");
 165 }
 166
 167 int main(int argc, char *argv[])
 168 {
 169         const char *backend_opts = "X11";
 170
 171         if (argc > 1)
 172                 font = GP_FontFaceLoad(argv[1], 0, 20);
 173
 174         print_instructions();
 175
 176         win = GP_BackendInit(backend_opts, "Font Align Test");
 177
 178         if (win == NULL) {
 179                 fprintf(stderr, "Failed to initalize backend '%s'\n",
 180                         backend_opts);
 181                 return 1;
 182         }
 183
 184         black_pixel    = GP_RGBToContextPixel(0x00, 0x00, 0x00, win->context);
 185         red_pixel      = GP_RGBToContextPixel(0xff, 0x00, 0x00, win->context);
 186         blue_pixel     = GP_RGBToContextPixel(0x00, 0x00, 0xff, win->context);
 187         green_pixel    = GP_RGBToContextPixel(0x00, 0xff, 0x00, win->context);
 188         yellow_pixel   = GP_RGBToContextPixel(0xff, 0xff, 0x00, win->context);
 189         white_pixel   = GP_RGBToContextPixel(0xff, 0xff, 0xff, win->context);
 190         darkgray_pixel = GP_RGBToContextPixel(0x7f, 0x7f, 0x7f, win->context);
 191
 192         redraw_screen();
 193         GP_BackendFlip(win);
 194         event_loop();
 195
 196         return 0;
 197 }
 198