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/* -*- mode: C; c-basic-offset: 2; indent-tabs-mode: nil; -*- */
#include <gtk/gtk.h>
#include <math.h>
#include <string.h>
#include "frame-stats.h"
#define RADIUS 64
#define DIAMETER (2*RADIUS)
#define WIDTH 600
#define HEIGHT 600
#define WINDOW_SIZE_JITTER 200
#define CYCLE_TIME 5.
static GtkWidget *window;
static int window_width = WIDTH, window_height = HEIGHT;
gint64 start_frame_time;
static double angle;
static double load_factor = 1.0;
static double cb_no_resize = FALSE;
static cairo_surface_t *source_surface;
static void
ensure_resources(cairo_surface_t *target)
{
cairo_t *cr;
int i, j;
if (source_surface != NULL)
return;
source_surface = cairo_surface_create_similar (target, CAIRO_CONTENT_COLOR_ALPHA,
16 * DIAMETER, 16 * DIAMETER);
cr = cairo_create(source_surface);
cairo_save(cr);
cairo_set_source_rgba(cr, 0, 0, 0, 0);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
cairo_restore(cr);
cairo_set_line_width(cr, 1.0);
for (j = 0; j < 16; j++)
for (i = 0; i < 16; i++)
{
cairo_set_source_rgba(cr,
((i * 41) % 16) / 15.,
((i * 31) % 16) / 15.,
((i * 23) % 16) / 15.,
0.25);
cairo_arc(cr,
i * DIAMETER + RADIUS, j * DIAMETER + RADIUS,
RADIUS - 0.5, 0, 2 * M_PI);
cairo_fill_preserve(cr);
cairo_set_source_rgba(cr,
((i * 41) % 16) / 15.,
((i * 31) % 16) / 15.,
((i * 23) % 16) / 15.,
1.0);
cairo_stroke(cr);
}
}
static gboolean
on_window_draw (GtkWidget *widget,
cairo_t *cr)
{
GRand *rand = g_rand_new_with_seed(0);
int i;
int width, height;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
ensure_resources (cairo_get_target (cr));
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_paint(cr);
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_set_line_width(cr, 1.0);
cairo_rectangle (cr, 0.5, 0.5, width - 1, height - 1);
cairo_stroke (cr);
for(i = 0; i < load_factor * 150; i++)
{
int source = g_rand_int_range(rand, 0, 255);
double phi = g_rand_double_range(rand, 0, 2 * M_PI) + angle;
double r = g_rand_double_range(rand, 0, width / 2 - RADIUS);
int x, y;
int source_x = (source % 16) * DIAMETER;
int source_y = (source / 16) * DIAMETER;
x = round(width / 2 + r * cos(phi) - RADIUS);
y = round(height / 2 - r * sin(phi) - RADIUS);
cairo_set_source_surface(cr, source_surface,
x - source_x, y - source_y);
cairo_rectangle(cr, x, y, DIAMETER, DIAMETER);
cairo_fill(cr);
}
g_rand_free(rand);
return FALSE;
}
static void
on_frame (double progress)
{
int jitter;
angle = 2 * M_PI * progress;
jitter = WINDOW_SIZE_JITTER * sin(angle);
if (!cb_no_resize)
{
window_width = WIDTH + jitter;
window_height = HEIGHT + jitter;
}
gtk_window_resize (GTK_WINDOW (window),
window_width, window_height);
gtk_widget_queue_draw (window);
}
static gboolean
tick_callback (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
gint64 frame_time = gdk_frame_clock_get_frame_time (frame_clock);
double scaled_time;
if (start_frame_time == 0)
start_frame_time = frame_time;
scaled_time = (frame_time - start_frame_time) / (CYCLE_TIME * 1000000);
on_frame (scaled_time - floor (scaled_time));
return G_SOURCE_CONTINUE;
}
static gboolean
on_map_event (GtkWidget *widget,
GdkEventAny *event)
{
gtk_widget_add_tick_callback (window, tick_callback, NULL, NULL);
return FALSE;
}
static GOptionEntry options[] = {
{ "factor", 'f', 0, G_OPTION_ARG_DOUBLE, &load_factor, "Load factor", "FACTOR" },
{ "no-resize", 'n', 0, G_OPTION_ARG_NONE, &cb_no_resize, "No Resize", NULL },
{ NULL }
};
int
main(int argc, char **argv)
{
GError *error = NULL;
GdkScreen *screen;
GdkRectangle monitor_bounds;
GOptionContext *context = g_option_context_new (NULL);
g_option_context_add_main_entries (context, options, NULL);
frame_stats_add_options (g_option_context_get_main_group (context));
g_option_context_add_group (context,
gtk_get_option_group (TRUE));
if (!g_option_context_parse (context, &argc, &argv, &error))
{
g_printerr ("Option parsing failed: %s\n", error->message);
return 1;
}
g_print ("# Load factor: %g\n",
load_factor);
g_print ("# Resizing?: %s\n",
cb_no_resize ? "no" : "yes");
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
frame_stats_ensure (GTK_WINDOW (window));
gtk_window_set_keep_above (GTK_WINDOW (window), TRUE);
gtk_window_set_gravity (GTK_WINDOW (window), GDK_GRAVITY_CENTER);
gtk_widget_set_app_paintable (window, TRUE);
g_signal_connect (window, "draw",
G_CALLBACK (on_window_draw), NULL);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_main_quit), NULL);
g_signal_connect (window, "map-event",
G_CALLBACK (on_map_event), NULL);
on_frame (0.);
screen = gtk_widget_get_screen (window);
gdk_screen_get_monitor_geometry (screen,
gdk_screen_get_primary_monitor (screen),
&monitor_bounds);
gtk_window_move (GTK_WINDOW (window),
monitor_bounds.x + (monitor_bounds.width - window_width) / 2,
monitor_bounds.y + (monitor_bounds.height - window_height) / 2);
gtk_widget_show (window);
gtk_main ();
return 0;
}
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