123 lines
2.9 KiB
C++
123 lines
2.9 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "zvision/common/scroller.h"
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namespace ZVision {
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LinearScroller::LinearScroller(const int16 activePos, const int16 idlePos, const int16 period) :
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_pos(idlePos),
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_prevPos(idlePos),
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_activePos(activePos),
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_idlePos(idlePos),
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_deltaPos((int16)(activePos - idlePos)),
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_period(period) {
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}
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LinearScroller::~LinearScroller() {
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}
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bool LinearScroller::update(uint32 deltatime) {
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_prevPos = _pos;
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if (_period != 0) {
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int16 targetPos;
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float dPos = 0;
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if (_active)
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targetPos = _activePos;
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else
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targetPos = _idlePos;
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if (_pos != targetPos) {
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dPos = (float)((int32)deltatime * (int32)_deltaPos) / _period;
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if ((int16)dPos == 0) {
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if (_deltaPos > 0)
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dPos = 1;
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else
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dPos = -1;
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}
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}
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if (!_active)
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dPos = -dPos;
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_pos += (int16)dPos;
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if ((dPos == 0) || ((dPos > 0) && (_pos > targetPos)) || ((dPos < 0) && (_pos < targetPos)))
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_pos = targetPos;
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_moving = (_pos != targetPos);
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} else {
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if (_active)
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_pos = _activePos;
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else
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_pos = _idlePos;
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_moving = false;
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}
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return (_pos != _prevPos); // True if redraw necessary
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}
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void LinearScroller::reset() {
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setActive(false);
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_pos = _idlePos;
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}
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void LinearScroller::setActive(bool active) {
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_active = active;
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}
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bool LinearScroller::isMoving() {
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return _moving;
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}
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Scroller::Scroller(const Common::Point &activePos, const Common::Point &idlePos, int16 period) :
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_xScroller(activePos.x, idlePos.x, period),
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_yScroller(activePos.y, idlePos.y, period) {
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_pos.x = _xScroller._pos;
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_pos.y = _yScroller._pos;
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}
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Scroller::~Scroller() {
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}
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void Scroller::reset() {
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_xScroller.reset();
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_yScroller.reset();
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}
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void Scroller::setActive(bool active) {
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_xScroller.setActive(active);
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_yScroller.setActive(active);
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}
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bool Scroller::isMoving() {
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return _xScroller.isMoving() || _yScroller.isMoving();
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}
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bool Scroller::update(uint32 deltatime) {
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bool redraw = false;
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if (_xScroller.update(deltatime))
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redraw = true;
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if (_yScroller.update(deltatime))
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redraw = true;
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_pos.x = _xScroller._pos;
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_pos.y = _yScroller._pos;
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return (redraw);
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}
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} // End of namespace ZVision
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