detector.c

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/*
 * Crossfire -- cooperative multi-player graphical RPG and adventure game
 *
 * Copyright (c) 1999-2014 Mark Wedel and the Crossfire Development Team
 * Copyright (c) 1992 Frank Tore Johansen
 *
 * Crossfire is free software and comes with ABSOLUTELY NO WARRANTY. You are
 * welcome to redistribute it under certain conditions. For details, please
 * see COPYING and LICENSE.
 *
 * The authors can be reached via e-mail at <crossfire@metalforge.org>.
 */
 
#include "global.h"
 
#include <string.h>
 
#include "ob_methods.h"
#include "ob_types.h"
#include "sounds.h"
#include "sproto.h"
 
static method_ret detector_type_process(object *op);
 
void init_type_detector(void) {
    register_process(DETECTOR, detector_type_process);
}
 
static void move_detector(object *op) {
    object *tmp;
    int last = op->value;
    int detected;
    detected = 0;
 
    if (!op->slaying) {
        if (op->map)
            LOG(llevError, "Detector with no slaying set at %s (%d,%d)\n", op->map->path, op->x, op->y);
        else if (op->env)
            LOG(llevError, "Detector with no slaying in %s\n", op->env->name);
        else
            LOG(llevError, "Detector with no slaying nowhere?\n");
        op->speed = 0;
        object_update_speed(op);
        return;
    }
 
    for (tmp = GET_MAP_OB(op->map, op->x, op->y); tmp != NULL; tmp = tmp->above) {
        if (op->stats.hp) {
            if (object_find_by_name(tmp, op->slaying) != NULL
            || object_find_by_type_and_slaying(tmp, FORCE, op->slaying)) {
                detected = 1;
                break;
            }
        }
        if (op->slaying == tmp->name) {
            detected = 1;
            break;
        }
        if (tmp->type == PLAYER && !strcmp(op->slaying, "player")) {
            detected = 1;
            break;
        }
        if (tmp->type == SPECIAL_KEY && tmp->slaying == op->slaying) {
            detected = 1;
            break;
        }
    }
 
    /* the detector sets the button if detection is found */
    if (op->stats.sp == 1)  {
        if (detected && last == 0) {
            op->value = 1;
            push_button(op);
        }
        if (!detected && last == 1) {
            op->value = 0;
            push_button(op);
        }
    } else { /* in this case, we unset buttons */
        if (detected && last == 1) {
            op->value = 0;
            push_button(op);
        }
        if (!detected && last == 0) {
            op->value = 1;
            push_button(op);
        }
    }
}
 
static method_ret detector_type_process(object *op) {
    move_detector(op);
    return METHOD_OK;
}