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