source: trunk/packages/vizservers/nanovis/NvCamera.cpp @ 1200

/*
 * ----------------------------------------------------------------------
 * NvCamera.cpp : NvCamera class
 *
 * ======================================================================
 *  AUTHOR:  Wei Qiao <qiaow@purdue.edu>
 *           Purdue Rendering and Perceptualization Lab (PURPL)
 *
 *  Copyright (c) 2004-2006  Purdue Research Foundation
 *
 *  See the file "license.terms" for information on usage and
 *  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 * ======================================================================
 */

#include <stdio.h>
#include <GL/glu.h>
#include "NvCamera.h"

NvCamera::NvCamera(int startx, int starty, int w, int h,
                   double loc_x, double loc_y, double loc_z, 
                   double target_x, double target_y, double target_z,
                   int angle_x, int angle_y, int angle_z):
    location(Vector3(loc_x, loc_y, loc_z)),
    target(Vector3(target_x, target_y, target_z)),
    angle(Vector3(angle_x, angle_y, angle_z)),
    width(w),
    height(h),
    startX(startx),
    startY(starty)
{ 
    /*empty*/
}

NvCamera::~NvCamera()
{
    /*empty*/
}        

void 
NvCamera::move(double loc_x, double loc_y, double loc_z)
{ 
    location = Vector3(loc_x, loc_y, loc_z); 
}

void 
NvCamera::aim(double target_x, double target_y, double target_z)
{ 
    target = Vector3(target_x, target_y, target_z);
}

void 
NvCamera::rotate(double angle_x, double angle_y, double angle_z)
{ 
    angle = Vector3(angle_x, angle_y, angle_z);
}

void 
NvCamera::activate()
{
    //fprintf(stderr, "camera: %d, %d\n", width, height);
    glViewport(startX, startY, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(30, (GLdouble)(width - startX)/(GLdouble)(height - startY), 
        0.1, 50.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    gluLookAt(location.x, location.y, location.z,
              target.x, target.y, target.z,
              0., 1., 0.);

    glRotated(angle.x, 1., 0., 0.);
    glRotated(angle.y, 0., 1., 0.);
    glRotated(angle.z, 0., 0., 1.);
}

void 
NvCamera::set_screen_size(int sx, int sy, int w, int h)
{
    width = w, height = h;
    startX = sx, startY = sy;
}