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// ----------------------------------------------------------
//
// Copyright (C) 2004 Brad Wasson <bard@wassonartistry.com>
//
// This file is part of 3ddesktop.
//
// 3ddesktop is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// 3ddesktop is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with 3ddesktop; see the file COPYING. If not, write to
// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
//
#include <math.h>
#include <GL/glu.h>
#include "camera.hpp"
Camera::Camera()
{
position = Vector(0.0, 0.0, 0.0);
viewvector = Vector(0.0, 0.0, 0.0);
upvector = Vector(0.0, 0.0, 1.0);
}
void Camera::PositionCamera(float position_x, float position_y, float position_z,
float viewvector_x, float viewvector_y, float viewvector_z,
float upvector_x, float upvector_y, float upvector_z)
{
position = Vector(position_x, position_y, position_z);
viewvector = Vector(viewvector_x, viewvector_y, viewvector_z);;
upvector = Vector(upvector_x, upvector_y, upvector_z);
}
void Camera::RotateView(float angle, float x, float y, float z)
{
Vector new_view;
Vector view = viewvector - position;
float cos_theta = (float)cos(angle);
float sin_theta = (float)sin(angle);
new_view.x = (cos_theta + (1 - cos_theta) * x * x) * view.x;
new_view.x += ((1 - cos_theta) * x * y - z * sin_theta) * view.y;
new_view.x += ((1 - cos_theta) * x * z + y * sin_theta) * view.z;
new_view.y = ((1 - cos_theta) * x * y + z * sin_theta) * view.x;
new_view.y += (cos_theta + (1 - cos_theta) * y * y) * view.y;
new_view.y += ((1 - cos_theta) * y * z - x * sin_theta) * view.z;
new_view.z = ((1 - cos_theta) * x * z - y * sin_theta) * view.x;
new_view.z += ((1 - cos_theta) * y * z + x * sin_theta) * view.y;
new_view.z += (cos_theta + (1 - cos_theta) * z * z) * view.z;
viewvector = position + new_view;
}
void Camera::RotateAroundPoint(Vector center, float angle, float x, float y, float z)
{
Vector new_position;
Vector pos = position - center;
float cos_theta = (float)cos(angle);
float sin_theta = (float)sin(angle);
new_position.x = (cos_theta + (1.0f - cos_theta) * x * x) * pos.x;
new_position.x += ((1.0f - cos_theta) * x * y - z * sin_theta) * pos.y;
new_position.x += ((1.0f - cos_theta) * x * z + y * sin_theta) * pos.z;
new_position.y = ((1.0f - cos_theta) * x * y + z * sin_theta) * pos.x;
new_position.y += (cos_theta + (1.0f - cos_theta) * y * y) * pos.y;
new_position.y += ((1.0f - cos_theta) * y * z - x * sin_theta) * pos.z;
new_position.z = ((1.0f - cos_theta) * x * z - y * sin_theta) * pos.x;
new_position.z += ((1.0f - cos_theta) * y * z + x * sin_theta) * pos.y;
new_position.z += (cos_theta + (1.0f - cos_theta) * z * z) * pos.z;
position = center + new_position;
}
void Camera::Look(void)
{
gluLookAt(position.x, position.y, position.z,
viewvector.x, viewvector.y, viewvector.z,
upvector.x, upvector.y, upvector.z);
}
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