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/* $Id: gameobject.c,v 1.3 2002/03/02 21:10:55 sverrehu Exp $ */
/**************************************************************************
*
* FILE gameobject.c
* MODULE OF snake4 - game of snake eating fruit
*
* DESCRIPTION
*
* WRITTEN BY Sverre H. Huseby <shh@thathost.com>
*
**************************************************************************/
#include <stdlib.h>
#include <X11/Xlib.h>
#include <shhmsg.h>
#include "board.h"
#include "gameobject.h"
/**************************************************************************
* *
* P R I V A T E D A T A *
* *
**************************************************************************/
static GameObject *list = NULL;
/**************************************************************************
* *
* P U B L I C F U N C T I O N S *
* *
**************************************************************************/
GameObject *
goNew(int type)
{
GameObject *go;
if ((go = malloc(sizeof(GameObject))) == NULL)
msgFatal("out of memory\n");
go->type = type;
go->active = 0;
go->x = go->y = 0;
go->pixmaps = NULL;
go->numPixmaps = 0;
go->currPixmap = 0;
go->ticksPixmap = NULL;
go->tickCount = 0;
go->allPixmapsCallback = NULL;
go->deactivateCallback = NULL;
/* include in list of handeled objects */
go->next = list;
if (list)
list->prev = go;
go->prev = NULL;
list = go;
return go;
}
void
goFree(GameObject *go)
{
if (go->prev == NULL) {
/* first element in list */
list = go->next;
if (go->next)
go->next->prev = NULL;
} else {
go->prev->next = go->next;
if (go->next)
go->next->prev = go->prev;
}
free(go->pixmaps);
free(go->ticksPixmap);
free(go);
}
void
goAddPixmap(GameObject *go, Pixmap pix, int ticks)
{
if (!go->numPixmaps) {
go->pixmaps = malloc(sizeof(Pixmap));
go->ticksPixmap = malloc(sizeof(int));
} else {
go->pixmaps
= realloc(go->pixmaps, (go->numPixmaps + 1) * sizeof(Pixmap));
go->ticksPixmap
= realloc(go->ticksPixmap, (go->numPixmaps + 1) * sizeof(int));
}
if (go->pixmaps == NULL || go->ticksPixmap == NULL)
msgFatal("out of memory\n");
go->pixmaps[go->numPixmaps] = pix;
go->ticksPixmap[go->numPixmaps] = ticks;
++go->numPixmaps;
}
void
goHandleTick(void)
{
GameObject *go;
go = list;
while (go) {
if (go->active && go->numPixmaps > 1) {
if (++go->tickCount >= go->ticksPixmap[go->currPixmap]) {
go->tickCount = 0;
if (++go->currPixmap >= go->numPixmaps) {
go->currPixmap = 0;
if (go->allPixmapsCallback)
go->allPixmapsCallback(go);
}
if (go->active) { /* may have been changed by callback */
boardClearBlock(go->x, go->y);
boardDrawBlock(go->pixmaps[go->currPixmap], go->x, go->y);
}
}
}
go = go->next;
}
}
void
goMove(GameObject *go, int x, int y)
{
int oldx, oldy;
GameObject *go2;
oldx = go->x;
oldy = go->y;
go->x = x;
go->y = y;
if (go->active) {
if ((go2 = goGetObjectAt(oldx, oldy)) != NULL)
boardDrawBlock(go2->pixmaps[go2->currPixmap], go2->x, go2->y);
else
boardClearBlock(oldx, oldy);
boardDrawBlock(go->pixmaps[go->currPixmap], go->x, go->y);
}
}
void
goActivate(GameObject *go)
{
if (go->active)
return;
go->active = 1;
goDraw(go);
}
void
goDeactivate(GameObject *go)
{
if (!go->active)
return;
go->active = 0;
if (go->deactivateCallback)
go->deactivateCallback(go);
goDraw(go);
}
void
goDraw(GameObject *go)
{
GameObject *go2;
if (go->active)
boardDrawBlock(go->pixmaps[go->currPixmap], go->x, go->y);
else {
if ((go2 = goGetObjectAt(go->x, go->y)) != NULL)
boardDrawBlock(go2->pixmaps[go2->currPixmap], go2->x, go2->y);
else
boardClearBlock(go->x, go->y);
}
}
void
goDrawAll(void)
{
GameObject *go;
go = list;
while (go) {
if (go->active)
boardDrawBlock(go->pixmaps[go->currPixmap], go->x, go->y);
go = go->next;
}
}
GameObject *
goGetObjectAt(int x, int y)
{
GameObject *go;
go = list;
while (go) {
if (go->active && go->x == x && go->y == y)
return go;
go = go->next;
}
return NULL;
}
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