tbftss/src/battle/rope.c

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/*
Copyright (C) 2015-2019,2022 Parallel Realities
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "../common.h"
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#include "../battle/hud.h"
#include "../battle/quadtree.h"
#include "../battle/script.h"
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#include "../system/sound.h"
#include "../system/util.h"
#include "rope.h"
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#define ROPE_DISTANCE 128
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extern App app;
extern Battle battle;
extern Colors colors;
extern Entity *player;
extern Entity *self;
void attachRope(void)
{
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int i, distance;
Entity *e, **candidates;
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if ((self->flags & EF_HAS_ROPE) && self->towing == NULL)
{
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candidates = getAllEntsInRadius(self->x, self->y, self->separationRadius, self);
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for (i = 0, e = candidates[i]; e != NULL; e = candidates[++i])
{
if (!e->owner && e->type == ET_FIGHTER && (e->flags & EF_DISABLED) && (e->flags & EF_ROPED_ATTACHED) == 0 && e->alive == ALIVE_ALIVE)
{
distance = getDistance(e->x, e->y, self->x, self->y);
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if (distance > 0 && distance <= self->separationRadius)
{
self->towing = e;
self->aiFlags |= AIF_GOAL_JUMPGATE;
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e->owner = self;
e->speed = 1;
e->flags |= EF_RETREATING;
e->flags |= EF_ROPED_ATTACHED;
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runScriptFunction("TOWING %s", e->name);
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if (self == player)
{
battle.stats[STAT_NUM_TOWED]++;
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addHudMessage(colors.white, _("Tow rope attached"));
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}
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playBattleSound(SND_TOW_ROPE, e->x, e->y);
}
}
}
}
}
void doRope(Entity *owner)
{
float dx, dy, angle, force;
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int distance;
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if (owner->towing)
{
distance = getDistance(owner->towing->x, owner->towing->y, owner->x, owner->y);
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if (distance > ROPE_DISTANCE)
{
angle = getAngle(owner->x, owner->y, owner->towing->x, owner->towing->y);
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dx = sin(TO_RAIDANS(angle));
dy = -cos(TO_RAIDANS(angle));
force = (distance - ROPE_DISTANCE) * 0.02;
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owner->towing->dx -= (dx * force);
owner->towing->dy -= (dy * force);
}
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owner->towing->dx *= 0.985;
owner->towing->dy *= 0.985;
}
}
void drawRope(Entity *e)
{
if (e->towing)
{
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SDL_SetRenderDrawColor(app.renderer, 200, 200, 200, 255);
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SDL_RenderDrawLine(app.renderer, e->x - battle.camera.x, e->y - battle.camera.y, e->towing->x - battle.camera.x, e->towing->y - battle.camera.y);
}
}
void cutRope(Entity *e)
{
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/* thing being towed is dead */
if (e->owner && e->owner->towing == e)
{
e->owner->towing = NULL;
e->owner->aiFlags &= ~AIF_GOAL_JUMPGATE;
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}
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/* tug is dead - reset thing being tugged */
if (e->towing)
{
e->towing->flags &= ~EF_RETREATING;
e->towing->flags &= ~EF_ROPED_ATTACHED;
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e->towing->owner = NULL;
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e->towing = NULL;
}
}