void Camera::pan(float x, float y)
{
float up[4] = {0.f, (m_phi < M_PI)?1.f:-1.f, 0.f, 0.f};
float fwd[4] = {m_o[0] - m_eye[0], m_o[1] - m_eye[1], m_o[2] - m_eye[2], 0.f};
vec3fNormalize(fwd, vec3fNorm(fwd));
float side[4];
vec3fCross(fwd, up, side);
vec3fNormalize(side, vec3fNorm(side));
vec3fCross(side, fwd, up);
m_o[0] += up[0] * y * m_radius * 2;
m_o[1] += up[1] * y * m_radius * 2;
m_o[2] += up[2] * y * m_radius * 2;
m_o[0] -= side[0] * x * m_radius * 2;
m_o[1] -= side[1] * x * m_radius * 2;
m_o[2] -= side[2] * x * m_radius * 2;
}
void Camera::centerOn(float center[4], float halfDists[4])
{
vec4fCopy(m_o, center);
m_radius = vec3fNorm(halfDists) * 2.f;
if (m_far < m_radius)
{
m_far = 1.5 * m_radius;
setPerspective(m_near, m_far, m_fov, m_ratio);
}
}
void Camera::zoom(float factor)
{
m_radius += factor * m_radius ;
if (m_radius < 0.1)
{
m_radius = 10.f;
float fwd[4] = {m_o[0] - m_eye[0], m_o[1] - m_eye[1], m_o[2] - m_eye[2], 0.f};
vec3fNormalize(fwd, vec3fNorm(fwd));
vec3fScale(fwd, m_radius);
vec3fAdd(m_eye, fwd, m_o);
}
}
float vec3fAng(vec3f_t* a, vec3f_t* b)
{
vec3f_t an = vec3fNorm(a);
vec3f_t bn = vec3fNorm(b);
return acosf(vec3fDot(&an, &bn));
}
