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347 lines
9.9 KiB
347 lines
9.9 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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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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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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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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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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#include "plAnimEaseTypes.h" |
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#include "plAnimTimeConvert.h" |
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/////////////////////////////////////////////////////////////////////////////////////////////// |
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plATCEaseCurve *plATCEaseCurve::CreateEaseCurve(UInt8 type, hsScalar minLength, hsScalar maxLength, hsScalar length, |
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hsScalar startSpeed, hsScalar goalSpeed) |
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{ |
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if (type == plAnimEaseTypes::kConstAccel) |
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return TRACKED_NEW plConstAccelEaseCurve(minLength, maxLength, length, startSpeed, goalSpeed); |
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if (type == plAnimEaseTypes::kSpline) |
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return TRACKED_NEW plSplineEaseCurve(minLength, maxLength, length, startSpeed, goalSpeed); |
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return nil; |
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} |
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void plATCEaseCurve::RecalcToSpeed(hsScalar startSpeed, hsScalar goalSpeed, hsBool preserveRate /* = false */) |
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{ |
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hsScalar rate = 1; |
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if (fSpeed == goalSpeed && fStartSpeed == startSpeed) // already there, no need to do anything |
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return; |
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if (preserveRate) |
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rate = (fSpeed - fStartSpeed) / fLength; |
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fStartSpeed = startSpeed; |
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fSpeed = goalSpeed; |
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if (preserveRate) |
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SetLengthOnRate(rate); |
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} |
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void plATCEaseCurve::SetLengthOnRate(hsScalar rate) |
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{ |
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fLength = (fSpeed - fStartSpeed) / rate; |
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if (fLength < 0) |
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fLength = -fLength; |
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} |
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hsScalar plATCEaseCurve::GetMinDistance() |
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{ |
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if (fMinLength == 0) |
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return 0; |
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hsScalar oldLength = fLength; |
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fLength = fMinLength; |
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hsScalar result = PositionGivenTime(fMinLength); |
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fLength = oldLength; |
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return result; |
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} |
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hsScalar plATCEaseCurve::GetMaxDistance() |
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{ |
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if (fMaxLength == 0) |
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return 0; |
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hsScalar oldLength = fLength; |
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fLength = fMaxLength; |
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hsScalar result = PositionGivenTime(fMaxLength); |
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fLength = oldLength; |
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return result; |
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} |
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hsScalar plATCEaseCurve::GetNormDistance() |
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{ |
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if (fNormLength == 0) |
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return 0; |
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hsScalar oldLength = fLength; |
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fLength = fNormLength; |
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hsScalar result = PositionGivenTime(fNormLength); |
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fLength = oldLength; |
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return result; |
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} |
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void plATCEaseCurve::Read(hsStream *s, hsResMgr *mgr) |
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{ |
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plCreatable::Read(s, mgr); |
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fMinLength = s->ReadSwapScalar(); |
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fMaxLength = s->ReadSwapScalar(); |
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fNormLength = fLength = s->ReadSwapScalar(); |
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fStartSpeed = s->ReadSwapScalar(); |
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fSpeed = s->ReadSwapScalar(); |
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fBeginWorldTime = s->ReadSwapDouble(); |
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} |
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void plATCEaseCurve::Write(hsStream *s, hsResMgr *mgr) |
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{ |
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plCreatable::Write(s, mgr); |
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s->WriteSwapScalar(fMinLength); |
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s->WriteSwapScalar(fMaxLength); |
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s->WriteSwapScalar(fNormLength); |
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s->WriteSwapScalar(fStartSpeed); |
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s->WriteSwapScalar(fSpeed); |
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s->WriteSwapDouble(fBeginWorldTime); |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////// |
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plConstAccelEaseCurve::plConstAccelEaseCurve() |
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{ |
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fMinLength = fMaxLength = fNormLength = fLength = 1; |
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fBeginWorldTime = 0; |
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RecalcToSpeed(0, 1); |
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} |
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plConstAccelEaseCurve::plConstAccelEaseCurve(hsScalar minLength, hsScalar maxLength, hsScalar length, |
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hsScalar startSpeed, hsScalar goalSpeed) |
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{ |
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fMinLength = minLength; |
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fMaxLength = maxLength; |
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fNormLength = fLength = length; |
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fBeginWorldTime = 0; |
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RecalcToSpeed(startSpeed, goalSpeed); |
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} |
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plATCEaseCurve *plConstAccelEaseCurve::Clone() const |
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{ |
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plConstAccelEaseCurve *curve = TRACKED_NEW plConstAccelEaseCurve; |
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curve->fStartSpeed = fStartSpeed; |
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curve->fMinLength = fMinLength; |
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curve->fMaxLength = fMaxLength; |
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curve->fNormLength = fNormLength; |
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curve->fBeginWorldTime = fBeginWorldTime; |
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curve->fLength = fLength; |
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curve->fSpeed = fSpeed; |
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return curve; |
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} |
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void plConstAccelEaseCurve::SetLengthOnDistance(hsScalar dist) |
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{ |
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fLength = 2 * dist / (fSpeed + fStartSpeed); |
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} |
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hsScalar plConstAccelEaseCurve::PositionGivenTime(hsScalar time) const |
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{ |
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return (hsScalar)(fStartSpeed * time + (0.5 * (fSpeed - fStartSpeed) / fLength) * time * time); |
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} |
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hsScalar plConstAccelEaseCurve::VelocityGivenTime(hsScalar time) const |
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{ |
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return fStartSpeed + ((fSpeed - fStartSpeed) / fLength) * time; |
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} |
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hsScalar plConstAccelEaseCurve::TimeGivenVelocity(hsScalar velocity) const |
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{ |
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return (velocity - fStartSpeed) / ((fSpeed - fStartSpeed) / fLength); |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////// |
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plSplineEaseCurve::plSplineEaseCurve() |
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{ |
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fMinLength = fMaxLength = fNormLength = fLength = 1; |
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fBeginWorldTime = 0; |
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RecalcToSpeed(0, 1); |
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} |
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plSplineEaseCurve::plSplineEaseCurve(hsScalar minLength, hsScalar maxLength, hsScalar length, |
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hsScalar startSpeed, hsScalar goalSpeed) |
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{ |
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fMinLength = minLength; |
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fMaxLength = maxLength; |
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fNormLength = fLength = length; |
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fBeginWorldTime = 0; |
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RecalcToSpeed(startSpeed, goalSpeed); |
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} |
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plATCEaseCurve *plSplineEaseCurve::Clone() const |
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{ |
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plSplineEaseCurve *curve = TRACKED_NEW plSplineEaseCurve; |
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curve->fStartSpeed = fStartSpeed; |
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curve->fMinLength = fMinLength; |
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curve->fMaxLength = fMaxLength; |
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curve->fNormLength = fNormLength; |
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curve->fBeginWorldTime = fBeginWorldTime; |
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curve->fLength = fLength; |
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curve->fSpeed = fSpeed; |
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int i; |
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for (i = 0; i < 4; i++) |
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curve->fCoef[i] = fCoef[i]; |
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return curve; |
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} |
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void plSplineEaseCurve::RecalcToSpeed(hsScalar startSpeed, hsScalar goalSpeed, hsBool preserveRate /* = false */) |
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{ |
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plATCEaseCurve::RecalcToSpeed(startSpeed, goalSpeed, preserveRate); |
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// These are greatly simplified because the in/out tangents are always zero |
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// Note: "b" is always zero for the ease splines we're currently doing (and will remain that way |
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// so long as the initial acceleration is zero. Can optimize a bit of the eval math to take |
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// advantage of this. |
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hsScalar a, b, c, d; |
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a = fStartSpeed; |
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b = 0; |
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c = -3 * fStartSpeed + 3 * fSpeed; |
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d = 2 * fStartSpeed - 2 * fSpeed; |
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fCoef[0] = a; |
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fCoef[1] = b; |
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fCoef[2] = c; |
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fCoef[3] = d; |
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} |
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void plSplineEaseCurve::SetLengthOnDistance(hsScalar dist) |
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{ |
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hsScalar curDist = PositionGivenTime(fLength); |
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fLength = fLength * dist / curDist; |
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} |
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hsScalar plSplineEaseCurve::PositionGivenTime(hsScalar time) const |
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{ |
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hsScalar t1, t2, t3, t4; |
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t1 = time / fLength; |
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t2 = t1 * t1; |
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t3 = t2 * t1; |
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t4 = t3 * t1; |
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return fLength * (fCoef[0] * t1 + fCoef[1] * t2 / 2 + fCoef[2] * t3 / 3 + fCoef[3] * t4 / 4); |
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} |
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hsScalar plSplineEaseCurve::VelocityGivenTime(hsScalar time) const |
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{ |
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hsScalar t1, t2, t3; |
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t1 = time / fLength; |
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t2 = t1 * t1; |
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t3 = t2 * t1; |
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return fCoef[0] + fCoef[1] * t1 + fCoef[2] * t2 + fCoef[3] * t3; |
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} |
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hsScalar plSplineEaseCurve::TimeGivenVelocity(hsScalar velocity) const |
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{ |
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// Code based off of Graphics Gems V, pp 11-12 and |
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// http://www.worldserver.com/turk/opensource/FindCubicRoots.c.txt |
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// Solving the equation: fCoef[0] + fCoef[1] * t + fCoef[2] * t^2 + fCoef[3] * t^3 - velocity = 0 |
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hsScalar root; |
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hsScalar a = (fCoef[0] - velocity) / fCoef[3]; |
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hsScalar b = fCoef[1] / fCoef[3]; |
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hsScalar c = fCoef[2] / fCoef[3]; |
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hsScalar Q = (c * c - 3 * b) / 9; |
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hsScalar R = (2 * c * c * c - 9 * c * b + 27 * a) / 54; |
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hsScalar Q3 = Q * Q * Q; |
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hsScalar D = Q3 - R * R; |
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if (D >= 0) |
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{ |
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// 3 roots, find the one in the range [0, 1] |
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const hsScalar pi = 3.14159; |
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double theta = acos(R / sqrt(Q3)); |
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double sqrtQ = sqrt(Q); |
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root = (hsScalar)(-2 * sqrtQ * cos((theta + 4 * pi) / 3) - c / 3); // Middle root, most likely to match |
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if (root < 0.f || root > 1.f) |
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{ |
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root = (hsScalar)(-2 * sqrtQ * cos((theta + 2 * pi) / 3) - c / 3); // Lower root |
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if (root < 0.f || root > 1.f) |
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{ |
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root = (hsScalar)(-2 * sqrtQ * cos(theta / 3) - c / 3); // Upper root |
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} |
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} |
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} |
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else // One root to the equation (I don't expect this to happen for ease splines, but JIC) |
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{ |
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double E = sqrt(-D) + pow(fabs(R), 1.f / 3.f); |
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root = (hsScalar)((E + Q / E) - c / 3); |
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if (R > 0) |
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root = -root; |
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} |
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if (root < 0.f || root > 1.f) |
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{ |
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hsAssert(false, "No valid root found while solving animation spline"); |
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// Either a bug, or a rare case of floating-point inaccuracy. Either way, guess |
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// the proper root as either the start or end of the curve based on the velocity. |
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hsScalar dStart = velocity - fStartSpeed; |
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if (dStart < 0) |
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dStart = -dStart; |
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hsScalar dEnd = velocity - fSpeed; |
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if (dEnd < 0) |
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dEnd = -dEnd; |
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root = (dStart < dEnd ? 0.f : 1.f); |
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} |
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return root * fLength; |
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} |
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void plSplineEaseCurve::Read(hsStream *s, hsResMgr *mgr) |
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{ |
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plATCEaseCurve::Read(s, mgr); |
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fCoef[0] = s->ReadSwapScalar(); |
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fCoef[1] = s->ReadSwapScalar(); |
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fCoef[2] = s->ReadSwapScalar(); |
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fCoef[3] = s->ReadSwapScalar(); |
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} |
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void plSplineEaseCurve::Write(hsStream *s, hsResMgr *mgr) |
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{ |
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plATCEaseCurve::Write(s, mgr); |
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s->WriteSwapScalar(fCoef[0]); |
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s->WriteSwapScalar(fCoef[1]); |
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s->WriteSwapScalar(fCoef[2]); |
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s->WriteSwapScalar(fCoef[3]); |
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} |
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