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/**********************************************************************
* sim.c - definition of the sim object - controls the simulation
*
* Copyright 1993, David Nedde
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for any purpose and without fee is granted
* provided that the above copyright notice appears in all copies.
* It is provided "as is" without express or implied warranty.
**********************************************************************/
/* Local headers */
#include "sim.h"
#include "misc.h"
#include "names.h"
/* System Headers */
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
/* Macros */
#define INVALID_WPID 0
#ifndef DELAY
#define DELAY 0
#endif
/* Structures */
typedef struct {
int delay;
} app_data,*app_data_ptr;
static app_data res_data;
static XtResource resources[] = {
{ "delay", "Delay", XtRInt, sizeof(int),
XtOffset(app_data_ptr,delay), XtRImmediate, (caddr_t)DELAY}
};
/* Functions */
static Boolean background_processing(/*sim*/);
static int delay();
static int process_invisible_backwards(/*datap_ptr*/);
/* Public object methods */
/* Create the simulation object */
sim_type sim__create(w, menu, items, room, demo)
Widget w;
menu_type menu;
items_type items;
room_type room;
demo_type demo;
{
sim_type sim = (sim_type)malloc( sizeof( sim_struct_type));
sim->menu = menu;
sim->items = items;
sim->room = room;
sim->demo = demo;
XtGetApplicationResources(w, (XtPointer)&res_data,
resources, XtNumber(resources),
(ArgList)NULL,(Cardinal)0);
sim->step_simulation = False;
sim->delay = res_data.delay;
sim->wpid = INVALID_WPID;
return sim;
}
/* Destroys the simulation object */
void sim__destroy(sim)
sim_type sim;
{
XtRemoveWorkProc(sim->wpid);
free( sim);
}
/* Steps the simulation one iteration */
void sim__step_mcb(w, sim, call_data, extra)
Widget w;
sim_type sim;
caddr_t call_data;
char * extra;
{
background_processing( sim);
}
/* Halts the simulation */
void sim__halt_mcb(w, sim, call_data, extra)
Widget w;
sim_type sim;
menuCallbackStruct * call_data;
char * extra;
{
sim->step_simulation = call_data->set;
if (!sim->step_simulation)
{
/* Stepping currently turned off */
/* Add background processing to perform simulation in real-time */
sim->wpid = XtAppAddWorkProc(XtWidgetToApplicationContext(w),
background_processing, (char *)sim);
/* The 'Step simulation' menu item is greyed since sim is running */
menu__set_sensitivity( sim->menu, STEP_SIM, /*sensitive=*/False);
}
else
{
/* Stepping turned on - remove the work proc if it has been started */
if (sim->wpid != INVALID_WPID)
XtRemoveWorkProc(sim->wpid);
sim->wpid = INVALID_WPID;
/* The 'Step simulation' menu item is ungreyed since sim not running */
menu__set_sensitivity( sim->menu, STEP_SIM, /*sensitive=*/True);
}
}
/* Private object methods */
/* Performs one iteration of the demo and simulation */
static Boolean background_processing(sim)
sim_type sim;
{
room_type room = sim->room;
if (demo__running(sim->demo))
demo__process( sim->demo);
/* Delay */
delay();
items__move_items( sim->items, room);
return /*remove work procedure=*/False;
}
/* Slow the simulation some amount */
/* Slow more if there are less balls, less if there are more balls */
static int delay(
)
{
static int first_flag = 1;
static struct timeval last = {0,0};
struct timeval tv;
struct timezone tz;
const int STEP = (10 * 1000); //10mSec
gettimeofday(&tv, &tz);
if (first_flag) {
first_flag = 0;
last = tv;
}
// Compute required delay
int delta = tv.tv_usec - last.tv_usec;
if (tv.tv_sec != last.tv_sec) {
delta += (tv.tv_sec - last.tv_sec) * 1000000;
}
if (delta < STEP) {
usleep(STEP - delta);
}
last = tv;
}
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