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/* Starshatter: The Open Source Project
Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
Copyright (c) 1997-2006, Destroyer Studios LLC.
AUTHOR: John DiCamillo
OVERVIEW
========
Camera Class - Position and Point of View
*/
#include "MemDebug.h"
#include "Camera.h"
// +--------------------------------------------------------------------+
Camera::Camera(double x, double y, double z)
: pos(x,y,z)
{ }
Camera::~Camera()
{ }
// +--------------------------------------------------------------------+
void
Camera::MoveTo(double x, double y, double z)
{
pos.x = x;
pos.y = y;
pos.z = z;
}
void
Camera::MoveTo(const Point& p)
{
pos.x = p.x;
pos.y = p.y;
pos.z = p.z;
}
// +--------------------------------------------------------------------+
void
Camera::MoveBy(double dx, double dy, double dz)
{
pos.x += dx;
pos.y += dz;
pos.z += dy;
}
void
Camera::MoveBy(const Point& p)
{
pos.x += p.x;
pos.y += p.y;
pos.z += p.z;
}
// +--------------------------------------------------------------------+
void
Camera::Clone(const Camera& cam)
{
pos = cam.pos;
orientation = cam.orientation;
}
// +--------------------------------------------------------------------+
void
Camera::LookAt(const Point& target, const Point& eye, const Point& up)
{
Point zaxis = target - eye; zaxis.Normalize();
Point xaxis = up.cross(zaxis); xaxis.Normalize();
Point yaxis = zaxis.cross(xaxis); yaxis.Normalize();
orientation(0,0) = xaxis.x;
orientation(0,1) = xaxis.y;
orientation(0,2) = xaxis.z;
orientation(1,0) = yaxis.x;
orientation(1,1) = yaxis.y;
orientation(1,2) = yaxis.z;
orientation(2,0) = zaxis.x;
orientation(2,1) = zaxis.y;
orientation(2,2) = zaxis.z;
pos = eye;
}
// +--------------------------------------------------------------------+
void
Camera::LookAt(const Point& target)
{
// No navel gazing:
if (target == Pos())
return;
Point tgt, tmp = target - Pos();
// Rotate into the view orientation:
tgt.x = (tmp * vrt());
tgt.y = (tmp * vup());
tgt.z = (tmp * vpn());
if (tgt.z == 0) {
Pitch(0.5);
Yaw(0.5);
LookAt(target);
return;
}
double az = atan(tgt.x/tgt.z);
double el = atan(tgt.y/tgt.z);
// if target is behind, offset by 180 degrees:
if (tgt.z < 0)
az -= PI;
Pitch(-el);
Yaw(az);
// roll to upright position:
double deflection = vrt().y;
while (fabs(deflection) > 0.001) {
double theta = asin(deflection/vrt().length());
Roll(-theta);
deflection = vrt().y;
}
}
// +--------------------------------------------------------------------+
bool
Camera::Padlock(const Point& target, double alimit, double e_lo, double e_hi)
{
// No navel gazing:
if (target == Pos())
return false;
Point tgt, tmp = target - Pos();
// Rotate into the view orientation:
tgt.x = (tmp * vrt());
tgt.y = (tmp * vup());
tgt.z = (tmp * vpn());
if (tgt.z == 0) {
Yaw(0.1);
tgt.x = (tmp * vrt());
tgt.y = (tmp * vup());
tgt.z = (tmp * vpn());
if (tgt.z == 0)
return false;
}
bool locked = true;
double az = atan(tgt.x/tgt.z);
double orig = az;
// if target is behind, offset by 180 degrees:
if (tgt.z < 0)
az -= PI;
while (az > PI) az -= 2*PI;
while (az < -PI) az += 2*PI;
if (alimit > 0) {
if (az < -alimit) {
az = -alimit;
locked = false;
}
else if (az > alimit) {
az = alimit;
locked = false;
}
}
Yaw(az);
// Rotate into the new view orientation:
tgt.x = (tmp * vrt());
tgt.y = (tmp * vup());
tgt.z = (tmp * vpn());
double el = atan(tgt.y/tgt.z);
if (e_lo > 0 && el < -e_lo) {
el = -e_lo;
locked = false;
}
else if (e_hi > 0 && el > e_hi) {
el = e_hi;
locked = false;
}
Pitch(-el);
return locked;
}
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