demos/c_simple/input_example.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) 2009-2013 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29
  30 #include "GP.h"
  31
  32 static GP_Context *win;
  33 static GP_Backend *backend;
  34
  35 static GP_Pixel red, green, white, black;
  36
  37 static void draw_event(GP_Event *ev)
  38 {
  39         static GP_Size size = 0;
  40
  41         if (ev->type != GP_EV_KEY)
  42                 return;
  43
  44         int align = GP_ALIGN_RIGHT|GP_VALIGN_BOTTOM;
  45
  46         GP_TextClear(win, NULL, 20, 20, align, black, size);
  47         size = GP_Print(win, NULL, 20, 20, align,
  48                         white, black, "Key=%s",
  49                         GP_EventKeyName(ev->val.key.key));
  50
  51         GP_BackendFlip(backend);
  52 }
  53
  54 static void event_loop(void)
  55 {
  56         for (;;) {
  57                 GP_BackendWait(backend);
  58
  59                 while (GP_BackendEventsQueued(backend)) {
  60                         GP_Event ev;
  61
  62                         GP_BackendGetEvent(backend, &ev);
  63                         GP_EventDump(&ev);
  64
  65                         switch (ev.type) {
  66                         case GP_EV_KEY:
  67                                 draw_event(&ev);
  68
  69                                 switch (ev.val.key.key) {
  70                                 case GP_KEY_ESC:
  71                                         GP_BackendExit(backend);
  72                                         exit(0);
  73                                 break;
  74                                 case GP_BTN_LEFT:
  75                                         GP_HLineXXY(win, ev.cursor_x - 3,
  76                                                     ev.cursor_x + 3,
  77                                                     ev.cursor_y, red);
  78                                         GP_VLineXYY(win, ev.cursor_x,
  79                                                     ev.cursor_y - 3,
  80                                                     ev.cursor_y + 3, red);
  81                                         GP_BackendFlip(backend);
  82                                 break;
  83                                 default:
  84                                 break;
  85                                 }
  86                         break;
  87                         case GP_EV_REL:
  88                                 switch (ev.code) {
  89                                 static int size = 0;
  90                                 case GP_EV_REL_POS:
  91                                         if (GP_EventGetKey(&ev, GP_BTN_LEFT)) {
  92                                                 GP_PutPixel(win, ev.cursor_x,
  93                                                             ev.cursor_y, green);
  94                                         }
  95                                         int align = GP_ALIGN_RIGHT|GP_VALIGN_BOTTOM;
  96
  97                                         GP_TextClear(win, NULL, 20, 40, align,
  98                                                      black, size);
  99                                         size = GP_Print(win, NULL, 20, 40, align,
 100                                                         white, black, "X=%3u Y=%3u dX=%3i dY=%3i",
 101                                                         ev.cursor_x, ev.cursor_y,
 102                                                         ev.val.rel.rx, ev.val.rel.ry);
 103                                         GP_BackendFlip(backend);
 104                                 break;
 105                                 }
 106                         break;
 107                         case GP_EV_SYS:
 108                                 switch (ev.code) {
 109                                 case GP_EV_SYS_RESIZE:
 110                                         GP_BackendResizeAck(backend);
 111                                 break;
 112                                 case GP_EV_SYS_QUIT:
 113                                         GP_BackendExit(backend);
 114                                         exit(0);
 115                                 break;
 116                                 }
 117                         break;
 118                         }
 119                 }
 120         }
 121 }
 122
 123 int main(int argc, char *argv[])
 124 {
 125         const char *backend_opts = "X11";
 126         int opt;
 127
 128         while ((opt = getopt(argc, argv, "b:h")) != -1) {
 129                 switch (opt) {
 130                 case 'b':
 131                         backend_opts = optarg;
 132                 break;
 133                 case 'h':
 134                         GP_BackendInit("help", NULL);
 135                         return 0;
 136                 break;
 137                 default:
 138                         fprintf(stderr, "Invalid paramter '%c'\n", opt);
 139                         return 1;
 140                 }
 141         }
 142
 143         backend = GP_BackendInit(backend_opts, "Input Test");
 144
 145         if (backend == NULL) {
 146                 fprintf(stderr, "Failed to initalize backend '%s'\n",
 147                         backend_opts);
 148                 return 1;
 149         }
 150
 151         win = backend->context;
 152
 153         red   = GP_ColorToContextPixel(GP_COL_RED, win);
 154         green = GP_ColorToContextPixel(GP_COL_GREEN, win);
 155         white = GP_ColorToContextPixel(GP_COL_WHITE, win);
 156         black = GP_ColorToContextPixel(GP_COL_BLACK, win);
 157
 158         GP_Fill(win, black);
 159         GP_BackendFlip(backend);
 160
 161         for (;;) {
 162                 GP_BackendWait(backend);
 163                 event_loop();
 164         }
 165 }