diff options
| -rw-r--r-- | xd.c | 130 |
1 files changed, 128 insertions, 2 deletions
@@ -64,6 +64,8 @@ static const char id[]="$Id$"; #define RND(x) (rand()%(x)) #define RND2(h,l) ((rand()%((h)-(l)))+(l)) +#define XY(x,y) ((x) + (y) * width) + /* ---------------------------------------- TYPES */ typedef enum {UsesImage, UsesPixmap} DType; @@ -170,10 +172,11 @@ static void TriangleDemo2(void); static void FollowDemo(void); static void CatwalkDemo(void); static void GravityDemo(void); +static void SnowDemo(void); /* ---------------------------------------- GLOBAL VARS */ -#define NO_DEMOS 18 +#define NO_DEMOS 19 static int demo=NO_DEMOS-1; @@ -271,6 +274,11 @@ static DemoInfo demotbl[NO_DEMOS]= GravityDemo, UsesPixmap }, + { + "Snow Demo (LMB reset)", + SnowDemo, + UsesPixmap + }, }; /* ---------------------------------------- X11 VARS @@ -4057,7 +4065,7 @@ static void GravityDemo(void) gravobj[f].dx = sintab[a] * 0.1; gravobj[f].dy = costab[a] * 0.1; - gravobj[f].mass = 1; + gravobj[f].mass = 10; gravobj[f].alive = TRUE; } @@ -4164,4 +4172,122 @@ static void GravityDemo(void) #undef GRAV_SIZE +/* ---------------------------------------- SNOW DEMO + */ + +#define SNOW_LINES 20 +#define SNOW_FLAKES 10000 + +static void SnowDemo(void) +{ + static int init = FALSE; + + static int *map; + + typedef struct + { + int x,y; + } Flake; + + static Flake *snow; + + int f,r; + int x,y; + int xi, yi; + + if (!init || mouse_b&Button1Mask) + { + Cls(); + + map = Grab(sizeof *map * width * height); + snow = Grab(sizeof *snow * SNOW_FLAKES); + + Line(0, 0, 0, height - 1, red); + Line(width - 1, 0, width - 1, height - 1, red); + Line(0, height - 1, width - 1, height - 1, red); + + for(x = 0; x < width; x++) + { + for(y = 0; y < height; y++) + { + if (x == 0 || x == width - 1 || y == height - 1) + { + map[XY(x,y)] = 1; + } + else + { + map[XY(x,y)] = 0; + } + } + } + + for(f = 0; f < SNOW_LINES; f++) + { + x = RND(width); + y = RND(height); + do + { + xi = RND2(1, -1); + } while (xi == 0); + yi = 0; + + for(r = RND(50) + 10; r > 0; r--) + { + if (x > 0 && x < width && y > 0 && y < height) + { + Plot(x, y, red); + map[XY(x,y)] = 1; + x += xi; + y += yi; + } + } + } + + for(f = 0; f < SNOW_FLAKES; f++) + { + do + { + snow[f].x = RND(width - 2) + 1; + snow[f].y = RND(height); + } while (map[XY(snow[f].x, snow[f].y)]); + } + + init=TRUE; + } + + for(f = 0; f < SNOW_FLAKES; f++) + { + if (map[XY(snow[f].x, snow[f].y + 1)] == 0) + { + Plot(snow[f].x, snow[f].y, black); + snow[f].y++; + Plot(snow[f].x, snow[f].y, white); + } + else if (map[XY(snow[f].x + 1, snow[f].y + 1)] == 0) + { + Plot(snow[f].x, snow[f].y, black); + snow[f].x++; + snow[f].y++; + Plot(snow[f].x, snow[f].y, white); + } + else if (map[XY(snow[f].x - 1, snow[f].y + 1)] == 0) + { + Plot(snow[f].x, snow[f].y, black); + snow[f].x--; + snow[f].y++; + Plot(snow[f].x, snow[f].y, white); + } + else + { + Plot(snow[f].x, snow[f].y, white); + map[XY(snow[f].x, snow[f].y)] = 1; + snow[f].x = RND(width - 2) + 1; + snow[f].y = 0; + } + } +} + +#undef SNOW_LINES + + /* END OF FILE */ |