particle-based-fluid-simulation/camera.cpp at master · shawnh310/particle-based-fluid-simulation · GitHub

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#include"camera.h"

#include<cmath>
#include<GLUT/glut.h>

Camera::Camera() :
    theta_(3.14159f/2.f),
    phi_(0),
    r_(0.6)
{
}

void Camera::Init(float theta, float phi, float r)
{
	theta_ = theta;
	phi_   = phi;
	r_     = r;

    // constraint theta to a range
    if (theta_ < 3.14159f * 0.1f)
        theta_ = 3.14159f * 0.1f;
    else if (theta_ > 3.14159f * 0.9f)
        theta_ = 3.14159f * 0.9f;

    Vector3Df pos = SphericalToXYZ();

	glLoadIdentity();
	gluLookAt(pos.x, pos.y, pos.z, 0, 0, 0, 0, 0, 1);
}


void Camera::UpdateAngles(float dtheta, float dphi)
{
    theta_ += dtheta;

    // constraint theta to a range
    if (theta_ < 3.14159f * 0.1f)
        theta_ = 3.14159f * 0.1f;
    else if (theta_ > 3.14159f * 0.9f)
        theta_ = 3.14159f * 0.9f;

    phi_ += dphi;

    Vector3Df pos = SphericalToXYZ();

	glLoadIdentity();
	gluLookAt(pos.x, pos.y, pos.z, 0, 0, 0, 0, 0, 1);
}

Vector3Df Camera::SphericalToXYZ()
{
    float x = r_ * sin(theta_) * cos(phi_);
    float y = r_ * sin(theta_) * sin(phi_);
	float z = r_ * cos(theta_);

    return Vector3Df(x,y,z);
}