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pendcouple.cpp
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Fri, Dec 13, 20:30

pendcouple.cpp
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#include "pendcouple.h"
#include "pendsphere.h"
#include "penduledesc.h"
#include <cmath>
#ifndef M_PI
#define M_PI 3.141592654
#endif
const double PenduleCouple::l1 = 5;
const double PenduleCouple::l2 = 5;
const double PenduleCouple::m1 = 1;
const double PenduleCouple::m2 = 1;
const double PenduleCouple::g = 9.81;
const Vector PenduleCouple::pos = {M_PI, M_PI};
const Vector PenduleCouple::speed = {0, 0};
PenduleCouple::PenduleCouple(GLModel *model)
: SymSystem(0)
{
// initialize components
descriptor = new PenduleDesc(l1, l2, m1, m2, pos, speed, g);
sphere[0] = new PendSphere(0, descriptor, model);
sphere[1] = new PendSphere(1, descriptor, model);
// bind descriptor
bind(descriptor);
// bind actors to the scene
addActor(sphere[0]);
addActor(sphere[1]);
sphere[0]->setColor(1, 0.5, 0.5);
sphere[1]->setColor(0.5, 0.5, 1);
}
PenduleCouple::~PenduleCouple()
{
// release descriptor
release();
// free allocated memory
delete sphere[0];
delete sphere[1];
delete descriptor;
}
#include "assets.h"
void PenduleCouple::evolve(float)
{
sphere[0]->setColor(alpha::colorGradientFunction(descriptor->getAngularSpeed(0), 2));
sphere[1]->setColor(alpha::colorGradientFunction(descriptor->getAngularSpeed(1), 2));
}
double PenduleCouple::energy() const
{
double as1(descriptor->getAngularSpeed(0));
double as2(descriptor->getAngularSpeed(1));
double pos1(descriptor->getAngle(0));
double pos2(descriptor->getAngle(1));
double e(0.5*m1*l1*l1*as1*as1 + 0.5*m2*(l1*l1*as1*as1 + l2*l2*as2*as2 + 2*l1*l2*as1*as2*cos(pos1-pos2)));
double u(-(l1+l2)*cos(pos1)*m1*g - l2*cos(pos2)*m2*g);
return (e+u);
}
#include "sktools.h"
using namespace symkit;
void PenduleCouple::render(symkit::render_s &args)
{
SymSystem::render(args);
setGLColor(args.shaderProgram, color_s(1, 1, 1));
SVector<3> delta = sphere[0]->position() - sphere[1]->position();
drawGLSegment(args.shaderProgram, 0, delta);
drawGLSegment(args.shaderProgram, delta, -sphere[1]->position());
}

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