test/testlines2.c
changeset 2887 f8c0c5ef6d54
child 2892 e4bafaa29c65
equal deleted inserted replaced
2886:633ce79b7a5b 2887:f8c0c5ef6d54
       
     1 
       
     2 /* Simple program:  draw as many random lines on the screen as possible */
       
     3 
       
     4 #include <stdlib.h>
       
     5 #include <stdio.h>
       
     6 #include <time.h>
       
     7 
       
     8 #include "common.h"
       
     9 
       
    10 #define NUM_LINES	100
       
    11 
       
    12 static CommonState *state;
       
    13 static int num_lines;
       
    14 static SDL_bool cycle_color;
       
    15 static SDL_bool cycle_alpha;
       
    16 static int cycle_direction = 1;
       
    17 static int current_alpha = 255;
       
    18 static int current_color = 255;
       
    19 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
       
    20 
       
    21 void
       
    22 DrawLines(SDL_WindowID window)
       
    23 {
       
    24     int i, n;
       
    25     int x1, y1, x2, y2;
       
    26     int window_w, window_h;
       
    27 
       
    28     SDL_SelectRenderer(window);
       
    29 
       
    30     /* Query the sizes */
       
    31     SDL_GetWindowSize(window, &window_w, &window_h);
       
    32 
       
    33     /* Move the sprite, bounce at the wall, and draw */
       
    34     n = 0;
       
    35     SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
       
    36     SDL_RenderFill(NULL);
       
    37 
       
    38     SDL_SetRenderDrawBlendMode(blendMode);
       
    39     for (i = 0; i < num_lines; ++i) {
       
    40         /* Cycle the color and alpha, if desired */
       
    41         if (cycle_color) {
       
    42             current_color += cycle_direction;
       
    43             if (current_color < 0) {
       
    44                 current_color = 0;
       
    45                 cycle_direction = -cycle_direction;
       
    46             }
       
    47             if (current_color > 255) {
       
    48                 current_color = 255;
       
    49                 cycle_direction = -cycle_direction;
       
    50             }
       
    51         }
       
    52         if (cycle_alpha) {
       
    53             current_alpha += cycle_direction;
       
    54             if (current_alpha < 0) {
       
    55                 current_alpha = 0;
       
    56                 cycle_direction = -cycle_direction;
       
    57             }
       
    58             if (current_alpha > 255) {
       
    59                 current_alpha = 255;
       
    60                 cycle_direction = -cycle_direction;
       
    61             }
       
    62         }
       
    63         SDL_SetRenderDrawColor(255, (Uint8) current_color,
       
    64                                (Uint8) current_color, (Uint8) current_alpha);
       
    65 
       
    66         x1 = rand() % window_w;
       
    67         x2 = rand() % window_w;
       
    68         y1 = rand() % window_h;
       
    69         y2 = rand() % window_h;
       
    70         SDL_RenderLine(x1, y1, x2, y2);
       
    71     }
       
    72     SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
       
    73 
       
    74     /* Update the screen! */
       
    75     SDL_RenderPresent();
       
    76 }
       
    77 
       
    78 int
       
    79 main(int argc, char *argv[])
       
    80 {
       
    81     int i, done;
       
    82     SDL_Event event;
       
    83     Uint32 then, now, frames;
       
    84 
       
    85     /* Initialize parameters */
       
    86     num_lines = NUM_LINES;
       
    87 
       
    88     /* Initialize test framework */
       
    89     state = CommonCreateState(argv, SDL_INIT_VIDEO);
       
    90     if (!state) {
       
    91         return 1;
       
    92     }
       
    93     for (i = 1; i < argc;) {
       
    94         int consumed;
       
    95 
       
    96         consumed = CommonArg(state, i);
       
    97         if (consumed == 0) {
       
    98             consumed = -1;
       
    99             if (SDL_strcasecmp(argv[i], "--blend") == 0) {
       
   100                 if (argv[i + 1]) {
       
   101                     if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
       
   102                         blendMode = SDL_BLENDMODE_NONE;
       
   103                         consumed = 2;
       
   104                     } else if (SDL_strcasecmp(argv[i + 1], "mask") == 0) {
       
   105                         blendMode = SDL_BLENDMODE_MASK;
       
   106                         consumed = 2;
       
   107                     } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
       
   108                         blendMode = SDL_BLENDMODE_BLEND;
       
   109                         consumed = 2;
       
   110                     } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
       
   111                         blendMode = SDL_BLENDMODE_ADD;
       
   112                         consumed = 2;
       
   113                     } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
       
   114                         blendMode = SDL_BLENDMODE_MOD;
       
   115                         consumed = 2;
       
   116                     }
       
   117                 }
       
   118             } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
       
   119                 cycle_color = SDL_TRUE;
       
   120                 consumed = 1;
       
   121             } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
       
   122                 cycle_alpha = SDL_TRUE;
       
   123                 consumed = 1;
       
   124             } else if (SDL_isdigit(*argv[i])) {
       
   125                 num_lines = SDL_atoi(argv[i]);
       
   126                 consumed = 1;
       
   127             }
       
   128         }
       
   129         if (consumed < 0) {
       
   130             fprintf(stderr,
       
   131                     "Usage: %s %s [--blend none|mask|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
       
   132                     argv[0], CommonUsage(state));
       
   133             return 1;
       
   134         }
       
   135         i += consumed;
       
   136     }
       
   137     if (!CommonInit(state)) {
       
   138         return 2;
       
   139     }
       
   140 
       
   141     /* Create the windows and initialize the renderers */
       
   142     for (i = 0; i < state->num_windows; ++i) {
       
   143         SDL_SelectRenderer(state->windows[i]);
       
   144         SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
       
   145         SDL_RenderFill(NULL);
       
   146     }
       
   147 
       
   148     srand(time(NULL));
       
   149 
       
   150     /* Main render loop */
       
   151     frames = 0;
       
   152     then = SDL_GetTicks();
       
   153     done = 0;
       
   154     while (!done) {
       
   155         /* Check for events */
       
   156         ++frames;
       
   157         while (SDL_PollEvent(&event)) {
       
   158             CommonEvent(state, &event, &done);
       
   159             switch (event.type) {
       
   160             case SDL_WINDOWEVENT:
       
   161                 switch (event.window.event) {
       
   162                 case SDL_WINDOWEVENT_EXPOSED:
       
   163                     SDL_SelectRenderer(event.window.windowID);
       
   164                     SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
       
   165                     SDL_RenderFill(NULL);
       
   166                     break;
       
   167                 }
       
   168                 break;
       
   169             default:
       
   170                 break;
       
   171             }
       
   172         }
       
   173         for (i = 0; i < state->num_windows; ++i) {
       
   174             DrawLines(state->windows[i]);
       
   175         }
       
   176     }
       
   177 
       
   178     /* Print out some timing information */
       
   179     now = SDL_GetTicks();
       
   180     if (now > then) {
       
   181         double fps = ((double) frames * 1000) / (now - then);
       
   182         printf("%2.2f frames per second\n", fps);
       
   183     }
       
   184     return 0;
       
   185 }
       
   186 
       
   187 /* vi: set ts=4 sw=4 expandtab: */