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| #include <stdio.h>
#include <cairo.h>
#include <gtk/gtk.h>
#include <glib.h>
gint pos_x=500,pos_y=500;
GtkWidget *window;
GtkWidget *drawarea; /* drawing area */
GRand *tirage; /* a random generator */
gint grid[1001][1001]; /* content of the grid */
int main(int argc, char *argv[])
{
gboolean on_expose_event(GtkWidget *widget, GdkEvent *event, gpointer userdata);
gboolean update(gpointer);
void OnDestroy(GtkWidget *pWidget, gpointer pData); /* function call back destroy */
void initialise(int);
gtk_init(&argc, &argv);
/* main window creation */
window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
/* random generator creation */
tirage=g_rand_new();
/* drawing points in the grid */
initialise(200);
/* drawing area creation */
drawarea=gtk_drawing_area_new();
gtk_widget_set_size_request(drawarea, (gint)1200, (gint)1200);
/* adding the drawarea to the window */
gtk_container_add (GTK_CONTAINER(window), drawarea);
g_signal_connect(G_OBJECT(drawarea), "expose_event", G_CALLBACK(on_expose_event), NULL);
g_signal_connect(window, "destroy", G_CALLBACK(OnDestroy), NULL);
g_timeout_add((guint)10, update, NULL); /* called function at regular intervals */
gtk_widget_show_all(window);
gtk_main();
return 0;
}
void OnDestroy(GtkWidget *pWidget, gpointer pData)
{
g_rand_free(tirage);
gtk_main_quit();
}
void initialise(int food)
{
int i,j,flag,tmp_x,tmp_y;
for (i=1;i<=1000;i++)
{
for (j=1;j<=1000;j++)
{
grid[i][j]=0;
}
}
/* drawing randomly locations in the grid */
for (i=1;i<=food;i++)
{
flag=1;
while (flag)
{
/* drawing an empty cell in the grid */
tmp_x=(int)(g_rand_double(tirage)*1000.)+1;
tmp_y=(int)(g_rand_double(tirage)*1000.)+1;
if (grid[tmp_x][tmp_y]==0)
flag=0;
}
grid[tmp_x][tmp_y]=1;
}
}
gboolean on_expose_event(GtkWidget *widget, GdkEvent *event, gpointer userdata)
{
int i, j;
cairo_t *cr=NULL;
cr=gdk_cairo_create(drawarea->window);
cairo_set_source_rgb(cr, .0, .0, .0);
cairo_rectangle(cr, 10.,10.,1000.,1000.);
/* drawing items in the grid */
for (i=1;i<=1000;i++)
{
for (j=1;j<=1000;j++)
{
if (grid[i][j]==1)
{
cairo_move_to(cr,(double)i+5.+10.,(double)j+10.);
cairo_arc(cr,(double)i+10.,(double)j+10., 5., 0.,6.28);
}
}
}
cairo_stroke(cr);
cairo_destroy(cr);
return FALSE;
}
gboolean update(gpointer pData)
{
/* invalidating a zone around pos_x, pos-y to force redrawing by the callback function link to expose-event */
gtk_widget_queue_draw_area(drawarea, pos_x-40,pos_y-40,80,80);
return TRUE;
} |
