karma/flying-balls
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added initial velocity and radius ranges and clear/trace factors

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This commit is contained in:
Antonio Carzaniga 2019-06-04 10:13:02 +02:00
parent f46f20aa81
commit eba900d9ef
1 changed files with 22 additions and 26 deletions
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42
balls.c
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@ -25,10 +25,14 @@ static double delta = 0.01;
static unsigned int width = 0; static unsigned int width = 0;
static unsigned int height = 0; static unsigned int height = 0;
static unsigned int ball_radius = 4; static unsigned int radius_min = 5;
static unsigned int radius_max = 10;
static unsigned int v_max = 100;
static unsigned int v_min = 0;
struct ball * balls = 0; struct ball * balls = 0;
unsigned int n_balls = 10; unsigned int n_balls = 50;
static double g_y = 20; static double g_y = 20;
static double g_x = 0; static double g_x = 0;
@ -38,12 +42,13 @@ void balls_init_state () {
static const unsigned int border = 10; static const unsigned int border = 10;
unsigned int w = width < 2*border ? 1 : width - 2*border; unsigned int w = width < 2*border ? 1 : width - 2*border;
unsigned int h = height < 2*border ? 1 : height - 2*border; unsigned int h = height < 2*border ? 1 : height - 2*border;
for (unsigned int i = 0; i < n_balls; ++i) { for (unsigned int i = 0; i < n_balls; ++i) {
balls[i].x = border + rand() % w; balls[i].x = border + rand() % w;
balls[i].y = border + rand() % h; balls[i].y = border + rand() % h;
balls[i].v_x = rand() % 100; balls[i].v_x = v_min + rand() % (v_max + 1 - v_min);
balls[i].v_y = rand() % 100; balls[i].v_y = v_min + rand() % (v_max + 1 - v_min);
balls[i].radius = ball_radius + rand() % 20; balls[i].radius = radius_min + rand() % (radius_max + 1 - radius_min);
} }
} }
@ -105,7 +110,7 @@ static void ball_update_state (struct ball * p) {
} }
static GdkPixbuf * pixbuf = 0; static GdkPixbuf * pixbuf = 0;
static double clear_alpha = 1.0; static double clear_factor [3] = { 0.0, 0.0, 0.0 };
static void destroy_surface () { static void destroy_surface () {
if (pixbuf) if (pixbuf)
@ -153,26 +158,15 @@ static void do_draw(GtkWidget * widget) {
int n_channels = gdk_pixbuf_get_n_channels(pixbuf); int n_channels = gdk_pixbuf_get_n_channels(pixbuf);
/* clear pixmap */ /* clear pixmap */
if (clear_alpha >= 1.0) {
for(int y = 0; y < height; ++y) { for(int y = 0; y < height; ++y) {
unsigned char * px = pixels + y*row_stride; unsigned char * px = pixels + y*row_stride;
for(int x = 0; x < width; ++x) { for(int x = 0; x < width; ++x) {
*px++ *= 0.95; for(int i = 0; i < n_channels; ++i)
*px++ *= 0.90; *px++ *= clear_factor[i];
*px++ *= 0.80;
}
}
} else {
for(int y = 0; y < height; ++y) {
unsigned char * px = pixels + y*row_stride;
for(int x = 0; x < width; ++x)
for(int i = 0; i < n_channels; ++i) {
*px = *px * (1.0 - clear_alpha);
++px;
}
} }
} }
/* draw balls */
for(int i = 0; i < n_balls; ++i) { for(int i = 0; i < n_balls; ++i) {
int x0 = balls[i].x <= balls[i].radius ? 0 : balls[i].x - balls[i].radius; int x0 = balls[i].x <= balls[i].radius ? 0 : balls[i].x - balls[i].radius;
int x1 = balls[i].x + balls[i].radius + 1 >= width ? width : balls[i].x + balls[i].radius + 1; int x1 = balls[i].x + balls[i].radius + 1 >= width ? width : balls[i].x + balls[i].radius + 1;
@ -231,7 +225,7 @@ static void destroy_window(void) {
void print_usage(const char * progname) { void print_usage(const char * progname) {
fprintf(stderr, fprintf(stderr,
"usage: %s [<width>x<height>] [n=<bumber of balls>] [trace=<tracing factor>] [fx=<x-force>] [fy=<y-force>] [radius=<ball radius>] [delta=<frame-delta-time>]\n", "usage: %s [<width>x<height>] [n=<bumber of balls>] [clear=<clear-red>,<clear-green>,<clear-blue>] [fx=<x-force>] [fy=<y-force>] [radius=<min-radius>-<max-radius>] [delta=<frame-delta-time>]\n",
progname); progname);
} }
@ -267,13 +261,15 @@ int main(int argc, const char *argv[]) {
continue; continue;
if (sscanf(argv[i], "n=%u", &n_balls) == 1) if (sscanf(argv[i], "n=%u", &n_balls) == 1)
continue; continue;
if (sscanf(argv[i], "trace=%lf", &clear_alpha) == 1) if (sscanf(argv[i], "clear=%lf,%lf,%lf", clear_factor, clear_factor + 1, clear_factor + 2) == 3)
continue; continue;
if (sscanf(argv[i], "fx=%lf", &g_x) == 1) if (sscanf(argv[i], "fx=%lf", &g_x) == 1)
continue; continue;
if (sscanf(argv[i], "fy=%lf", &g_y) == 1) if (sscanf(argv[i], "fy=%lf", &g_y) == 1)
continue; continue;
if (sscanf(argv[i], "radius=%u", &ball_radius) == 1) if (sscanf(argv[i], "radius=%u-%u", &radius_min, &radius_max) == 2)
continue;
if (sscanf(argv[i], "v=%u-%u", &v_min, &v_max) == 2)
continue; continue;
if (sscanf(argv[i], "delta=%lf", &delta) == 1) if (sscanf(argv[i], "delta=%lf", &delta) == 1)
continue; continue;