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104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "mutationofjb/tasks/objectanimationtask.h"
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#include "mutationofjb/tasks/taskmanager.h"
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#include "mutationofjb/game.h"
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#include "mutationofjb/gamedata.h"
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#include "mutationofjb/room.h"
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namespace MutationOfJB {
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static const int TICK_MILLIS = 100;
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// TODO: Respect currentScene._delay.
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ObjectAnimationTask::ObjectAnimationTask() : _timer(TICK_MILLIS) {
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}
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void ObjectAnimationTask::start() {
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setState(RUNNING);
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_timer.start();
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}
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void ObjectAnimationTask::update() {
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_timer.update();
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if (_timer.isFinished()) {
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_timer.start();
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updateObjects();
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}
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}
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/**
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* Advances every object animation in the current scene to the next frame.
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*
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* Normally the animation restarts after the last object frame. However, some animations have random
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* elements to them. If _randomFrame is set, the animation restarts when _randomFrame is reached.
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* Additionally, there is a chance with each frame until _randomFrame that the animation may jump
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* straight to _randomFrame and continue until the last frame, then wrap around to the first frame.
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*
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* Randomness is used to introduce variety - e.g. in the starting scene a perched bird occassionally
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* spreads its wings.
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*/
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void ObjectAnimationTask::updateObjects() {
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Scene *const scene = getTaskManager()->getGame().getGameData().getCurrentScene();
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if (!scene) {
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return;
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}
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for (uint8 i = 1; i <= scene->getNoObjects(); ++i) {
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Object *const object = scene->getObject(i);
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// Skip if object animation not active.
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if (!object->_active)
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continue;
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// Number of frames must be higher than 1.
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if (object->_numFrames <= 1)
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continue;
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const uint8 currentAnimOffset = object->_currentFrame - object->_firstFrame;
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const bool randomized = object->_randomFrame != 0;
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const bool belowRandomFrame = currentAnimOffset < (object->_randomFrame - 1);
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uint8 maxAnimOffset = object->_numFrames - 1;
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if (randomized && belowRandomFrame) {
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maxAnimOffset = object->_randomFrame - 2;
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}
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uint8 nextAnimationOffset = currentAnimOffset + 1;
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if (currentAnimOffset == maxAnimOffset) {
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if (randomized && object->_jumpChance != 0 && getTaskManager()->getGame().getRandomSource().getRandomNumber(object->_jumpChance) == 0)
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nextAnimationOffset = object->_randomFrame - 1;
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else
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nextAnimationOffset = 0;
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}
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// TODO: Hardcoded animations.
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object->_currentFrame = nextAnimationOffset + object->_firstFrame;
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getTaskManager()->getGame().getRoom().drawObjectAnimation(i, nextAnimationOffset);
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}
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}
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}
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