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73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
//---------------------------------------------------------------------------
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#include "system.hpp"
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#include "classes.hpp"
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#include "opengl/glew.h"
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#include "opengl/glut.h"
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#pragma hdrstop
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#include "Spring.h"
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#include "Usefull.h"
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__fastcall TSpring::TSpring()
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{
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vForce1 = vForce2 = vector3(0, 0, 0);
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Ks = 0;
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Kd = 0;
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restLen = 0;
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}
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__fastcall TSpring::~TSpring() {}
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void __fastcall TSpring::Init(double nrestLen, double nKs, double nKd)
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{
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Ks = nKs;
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Kd = nKd;
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restLen = nrestLen;
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}
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bool __fastcall TSpring::ComputateForces(vector3 pPosition1, vector3 pPosition2)
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{
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double dist, Hterm, Dterm;
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vector3 springForce, deltaV, deltaP;
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// p1 = &system[spring->p1];
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// p2 = &system[spring->p2];
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// VectorDifference(&p1->pos,&p2->pos,&deltaP); // Vector distance
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deltaP = pPosition1 - pPosition2;
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// dist = VectorLength(&deltaP); // Magnitude of
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//deltaP
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dist = deltaP.Length();
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if (dist == 0)
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{
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vForce1 = vForce2 = vector3(0, 0, 0);
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return false;
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}
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// Hterm = (dist - spring->restLen) * spring->Ks; // Ks * (dist - rest)
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Hterm = (dist - restLen) * Ks; // Ks * (dist - rest)
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// VectorDifference(&p1->v,&p2->v,&deltaV); // Delta Velocity Vector
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deltaV = pPosition1 - pPosition2;
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// Dterm = (DotProduct(&deltaV,&deltaP) * spring->Kd) / dist; // Damping Term
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// Dterm = (DotProduct(deltaV,deltaP) * Kd) / dist;
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Dterm = 0;
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// ScaleVector(&deltaP,1.0f / dist, &springForce); // Normalize Distance Vector
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// ScaleVector(&springForce,-(Hterm + Dterm),&springForce); // Calc Force
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springForce = deltaP / dist * (-(Hterm + Dterm));
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// VectorSum(&p1->f,&springForce,&p1->f); // Apply to Particle 1
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// VectorDifference(&p2->f,&springForce,&p2->f); // - Force on Particle 2
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vForce1 = springForce;
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vForce2 = springForce;
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return true;
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}
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void __fastcall TSpring::Render() {}
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//---------------------------------------------------------------------------
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#pragma package(smart_init)
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