old_tests/widelinetest.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) 2009-2010 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include <math.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <SDL/SDL.h>
  30
  31 #include "GP.h"
  32
  33 /* The surface used as a display (in fact it is a software surface). */
  34 SDL_Surface *display = NULL;
  35
  36 /* Timer used for refreshing the display */
  37 SDL_TimerID timer;
  38
  39 /* An event used for signaling that the timer was triggered. */
  40 SDL_UserEvent timer_event;
  41
  42 /* Values for color pixels in display format. */
  43 static long colors[GP_BASIC_COLOR_COUNT];
  44
  45 Uint32 timer_callback(__attribute__((unused)) Uint32 interval,
  46                         __attribute__((unused)) void *param)
  47 {
  48         timer_event.type = SDL_USEREVENT;
  49         SDL_PushEvent((SDL_Event *) &timer_event);
  50         return 30;
  51 }
  52
  53 double start_angle = 0.0;
  54
  55 void redraw_screen(void)
  56 {
  57         int i;
  58
  59         for (i = 1; i < 10; i++) {
  60                 GP_HLineWide(display, colors[GP_WHITE], GP_LINE_CENTER, i, 10, 100, 20*i);
  61                 GP_HLine(display, colors[GP_RED], 10, 100, 20*i);
  62         }
  63
  64         for (i = 1; i < 10; i++) {
  65                 GP_VLineWide(display, colors[GP_WHITE], GP_LINE_CENTER, i, 100 + 20*i, 100, 190);
  66                 GP_VLine(display, colors[GP_RED], 100 + 20*i, 100, 190);
  67         }
  68 }
  69
  70 void event_loop(void)
  71 {
  72         SDL_Event event;
  73
  74         while (SDL_WaitEvent(&event) > 0) {
  75                 switch (event.type) {
  76                         case SDL_USEREVENT:
  77                                 redraw_screen();
  78                                 SDL_Flip(display);
  79                                 start_angle += 0.01;
  80                                 if (start_angle > 2*M_PI) {
  81                                         start_angle = 0.0;
  82                                 }
  83                         break;
  84                         case SDL_KEYDOWN:
  85                         case SDL_QUIT:
  86                                 return;
  87                 }
  88         }
  89 }
  90
  91 int main(void)
  92 {
  93         /* Initialize SDL */
  94         if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0) {
  95                 fprintf(stderr, "Could not initialize SDL: %s\n", SDL_GetError());
  96                 return 1;
  97         }
  98
  99         /* Create a window with a software back surface */
 100         display = SDL_SetVideoMode(640, 480, 0, SDL_SWSURFACE);
 101         if (display == NULL) {
 102                 fprintf(stderr, "Could not open display: %s\n", SDL_GetError());
 103                 goto fail;
 104         }
 105
 106         /* Print basic information about the surface */
 107         printf("Display surface properties:\n");
 108         printf("    width: %4d, height: %4d, pitch: %4d\n",
 109                display->w, display->h, display->pitch);
 110         printf("    bits per pixel: %2d, bytes per pixel: %2d\n",
 111                display->format->BitsPerPixel, display->format->BytesPerPixel);
 112
 113         /* Get colors */
 114         GP_LoadBasicColors(display, colors);
 115
 116         /* Set up a clipping rectangle to test proper clipping of pixels */
 117         SDL_Rect clip_rect = { 10, 10, 620, 460 };
 118         SDL_SetClipRect(display, &clip_rect);
 119
 120         /* Set up the refresh timer */
 121         timer = SDL_AddTimer(30, timer_callback, NULL);
 122         if (timer == 0) {
 123                 fprintf(stderr, "Could not set up timer: %s\n", SDL_GetError());
 124                 goto fail;
 125         }
 126
 127         /* Enter the event loop */
 128         event_loop();
 129
 130         /* We're done */
 131         SDL_Quit();
 132         return 0;
 133
 134 fail:
 135         SDL_Quit();
 136         return 1;
 137 }
 138