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#include <stdlib.h>
#include <math.h>
#include <gtk/gtk.h>
#include <cairo.h>
struct molecule {
guint x, y, Vx, Vy;
} rand_molecule;
static const gushort R = 10;
static const gushort V = 5;
static guint w_width = 850;
static guint w_height = 550;
static gboolean on_draw_event (GtkWidget *widget, cairo_t *cr, gpointer user_data) {
cr = gdk_cairo_create (gtk_widget_get_window (widget));
// Paint a circle
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_arc (cr, rand_molecule.x, rand_molecule.y, R, 0, 2 * G_PI);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 1);
cairo_stroke (cr);
// Free memory
cairo_destroy (cr);
return FALSE;
}
static gboolean source_func (gpointer user_data) {
cairo_t *cr;
cr = gdk_cairo_create (gtk_widget_get_window (user_data));
// Move the molecule
rand_molecule.x += rand_molecule.Vx;
rand_molecule.y += rand_molecule.Vy;
if (rand_molecule.x > (w_width - R)) {
rand_molecule.x = w_width - R;
rand_molecule.Vx = -rand_molecule.Vx;
}
if (rand_molecule.x < R) {
rand_molecule.x = R;
rand_molecule.Vx = -rand_molecule.Vx;
}
if (rand_molecule.y > (w_height - R)) {
rand_molecule.y = w_height - R;
rand_molecule.Vy = -rand_molecule.Vy;
}
if (rand_molecule.y < R) {
rand_molecule.y = R;
rand_molecule.Vy = -rand_molecule.Vy;
}
// Paint a circle
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_arc (cr, rand_molecule.x, rand_molecule.y, R, 0, 2 * G_PI);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 1);
cairo_stroke (cr);
// Free memory
cairo_destroy (cr);
return TRUE;
}
int main (int argc, char **argv) {
double angle;
GRand *rand;
GtkWindow *window;
GtkDrawingArea *darea;
// Init
gtk_init (&argc, &argv);
rand = g_rand_new ();
// Get random coordinates for the first molecule
rand_molecule.x = g_rand_int_range (rand, R, w_width - R);
rand_molecule.y = g_rand_int_range (rand, R, w_height - R);
angle = g_rand_double_range (rand, 0, 360) * G_PI / 180;
// Get the velocity components
rand_molecule.Vx = round (V * sin (angle));
rand_molecule.Vy = round (V * cos (angle));
// Create and configure the window and the needed areas
window = (GtkWindow *)gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_position (window, GTK_WIN_POS_CENTER);
gtk_window_set_default_size (window, w_width, w_height);
gtk_window_set_title (window, "Молекула газа в закрытом сосуде");
darea = (GtkDrawingArea *)gtk_drawing_area_new ();
gtk_container_add (GTK_CONTAINER (window), GTK_WIDGET (darea));
gtk_widget_show_all (GTK_WIDGET (window));
g_signal_connect (G_OBJECT (darea), "draw", G_CALLBACK (on_draw_event), NULL);
g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
g_timeout_add (15, source_func, window);
gtk_main ();
g_rand_free (rand);
return EXIT_SUCCESS;
}
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