graphics.c

   1 #include <stdio.h>
   2
   3 #include <SDL/SDL.h>
   4
   5 #include "tennix.h"
   6 #include "graphics.h"
   7 #include "input.h"
   8
   9 void show_sprite( const char* name, int pos, int items, int x_offset, int y_offset, int opacity) {
  10     SDL_Surface *bitmap;
  11     SDL_Rect src, dst;
  12
  13     bitmap = SDL_LoadBMP( name);
  14     if( bitmap == NULL) {
  15         fprintf( stderr, "Error: %s\n", SDL_GetError());
  16         return;
  17     }
  18
  19     SDL_SetAlpha( bitmap, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
  20     SDL_SetColorKey( bitmap, SDL_SRCCOLORKEY, SDL_MapRGB( bitmap->format, 0, 0, 0));
  21
  22     dst.w = src.w = bitmap->w/items;
  23     dst.h = src.h = bitmap->h;
  24     src.x = src.w*pos;
  25     src.y = 0;
  26     dst.x = x_offset;
  27     dst.y = y_offset;
  28
  29     SDL_BlitSurface( bitmap, &src, screen, &dst);
  30     SDL_FreeSurface( bitmap);
  31 }
  32
  33 void show_bmp( const char *name, int x_offset, int y_offset, int opacity) {
  34     show_sprite( name, 0, 1, x_offset, y_offset, opacity);
  35 }
  36
  37 void show_digit( int zahl, int x_offset, int y_offset, int opacity) {
  38     show_sprite( "data/score.bmp", zahl, 11, x_offset, y_offset, opacity);
  39 }
  40
  41 void introimage( char *name) {
  42     int i;
  43
  44     for( i=0; i<256; i+=10) {
  45         clearscr();
  46         show_bmp( name, 0, 0, i);
  47         updatescr();
  48         SDL_Delay( 30);
  49     }
  50
  51     //SDL_Delay( 500);
  52     wait_keypress();
  53
  54     for( i=255; i>=0; i-=10) {
  55         clearscr();
  56         show_bmp( name, 0, 0, i);
  57         updatescr();
  58         SDL_Delay( 30);
  59     }
  60
  61     clearscr();
  62 }
  63
  64 void clearscr() {
  65     SDL_Rect rect;
  66
  67     rect.x = 0;
  68     rect.y = 0;
  69     rect.w = WIDTH;
  70     rect.h = HEIGHT;
  71
  72     SDL_FillRect( screen, &rect, SDL_MapRGB( screen->format, 0, 0, 0));
  73 }
  74
  75 void updatescr() {
  76     SDL_UpdateRect( screen, 0, 0, 0, 0);
  77 }
  78