/*
* Descent 3 
* Copyright (C) 2024 Parallax Software
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

--- HISTORICAL COMMENTS FOLLOW ---

 * $Logfile: /DescentIII/Main/editor/moveworld.cpp $
 * $Revision: 1.1.1.1 $
 * $Date: 2003-08-26 03:57:38 $
 * $Author: kevinb $
 *
 * Code to use the mouse to rotate and move the world in the editor
 *
 * $Log: not supported by cvs2svn $
 * 
 * 6     10/04/98 1:25p Matt
 * 
 * 5     1/20/98 1:36p Matt
 * Moved mine origin to the center of the terrain
 * 
 * 4     10/03/97 3:39p Matt
 * Added seperate sets of wireframe view variables for mine & room views
 * 
 * 3     7/22/97 7:08p Matt
 * Cleaned up D3EditState, moving some vars in and some out, and renaming
 * and changing a few others
 * 
 * 8     6/13/97 4:24p Matt
 * Added functions to change wireframe view target
 * 
 * 7     5/22/97 5:16p Jason
 * added "drawing" on the topo map
 * 
 * 6     3/31/97 5:58p Matt
 * Revamped mine update flags
 * 
 * 5     2/10/97 5:39p Matt
 * Added func to reset view
 * 
 * 4     2/07/97 5:47p Matt
 * Renamed vector.h to vecmat.h to fix DevStudio problem
 *
 * $NoKeywords: $
 */

#include "Moveworld.h"

#include "ddio.h"
#include "vecmat.h"
#include "d3edit.h"
#include "mono.h"

#define dist_2d(x,y)  sqrt((x)*(x) + (y)*(y))

void GetMouseRotation( int idx, int idy, matrix * RotMat )
{
	float dr, cos_theta, sin_theta, denom, cos_theta1;
	float Radius = 100.0;
	float dx,dy;
	float dxdr,dydr;

	idy *= -1;

	dx = idx; dy = idy;

	dr = dist_2d(dx,dy);

	denom = dist_2d(Radius,dr);

	cos_theta = Radius / denom;
	sin_theta = dr / denom;

	cos_theta1 = 1.0 - cos_theta;

	dxdr = dx / dr;
	dydr = dy / dr;

	RotMat->rvec.x = cos_theta + ((dydr * dydr) * cos_theta1);
	RotMat->uvec.x = - ((dxdr * dydr) * cos_theta1);
	RotMat->fvec.x = (dxdr * sin_theta);

	RotMat->rvec.y = RotMat->uvec.x;
	RotMat->uvec.y = cos_theta + ((dxdr * dxdr) * cos_theta1);
	RotMat->fvec.y = (dydr * sin_theta);

	RotMat->rvec.z = -RotMat->fvec.x;
	RotMat->uvec.z = -RotMat->fvec.y;
	RotMat->fvec.z = cos_theta;

}

//Variables for current view position and orientation
#define DEFAULT_VIEW_DIST	500
#define DEFAULT_VIEW_RAD	5000

//Wireframe views for the mine & room views
wireframe_view Wireframe_view_mine = {IDENTITY_MATRIX,{0,0,0},DEFAULT_VIEW_DIST,DEFAULT_VIEW_RAD};
wireframe_view Wireframe_view_room = {IDENTITY_MATRIX,{0,0,0},DEFAULT_VIEW_DIST,DEFAULT_VIEW_RAD};

//The current wireframe view
wireframe_view *Wireframe_view = &Wireframe_view_mine;

#define MOVE_SCALE  3.0
#define ZOOM_SCALE 10.0
#define RAD_SCALE	 10.0

//Read the mouse and move the wireframe view
void MoveWorld()
{
	int x,y,dx,dy;
	ddio_MouseGetState(&x, &y, &dx, &dy);

	if ( (dx!=0) || (dy!=0) ) {

		if (Editor_view_mode==VM_TERRAIN)
		{
			return;
		}

		if ((KEY_STATE(KEY_LCTRL) || KEY_STATE(KEY_RCTRL)) && !(KEY_STATE(KEY_LSHIFT) || KEY_STATE(KEY_RSHIFT))) {
			matrix rotmat,tempm;
			GetMouseRotation( dx, dy, &rotmat );
			tempm = Wireframe_view->orient * rotmat;
			Wireframe_view->orient = tempm;
			Edview_changed = 1;
		}

		if ((KEY_STATE(KEY_LCTRL) || KEY_STATE(KEY_RCTRL)) && (KEY_STATE(KEY_LSHIFT) || KEY_STATE(KEY_RSHIFT))) {
			Wireframe_view->target += Wireframe_view->orient.rvec * -dx * MOVE_SCALE; 
			Wireframe_view->target += Wireframe_view->orient.uvec *  dy * MOVE_SCALE; 
			Edview_changed = 1;
		}

		if (KEY_STATE(KEY_Z) && !(KEY_STATE(KEY_LSHIFT) || KEY_STATE(KEY_RSHIFT))) {
			Wireframe_view->dist += dy * ZOOM_SCALE;
			if (Wireframe_view->dist < 0)
				Wireframe_view->dist = 0;
			Edview_changed = 1;
		}

		if (KEY_STATE(KEY_Z) && (KEY_STATE(KEY_LSHIFT) || KEY_STATE(KEY_RSHIFT))) {
			Wireframe_view->rad += dy * RAD_SCALE;
			if (Wireframe_view->rad < 0)
				Wireframe_view->rad = 0;
			EditorStatus("View radius = %.0f",Wireframe_view->rad);
			Edview_changed = 1;
		}
	}
}

extern vector Mine_origin;

//Reset the orienation, position, & distance of the wireframe view
void ResetWireframeView()
{
	Wireframe_view->dist = DEFAULT_VIEW_DIST;
	Wireframe_view->rad = DEFAULT_VIEW_RAD;
	vm_MakeIdentity(&Wireframe_view->orient);

	Wireframe_view->target = Mine_origin;

	Edview_changed = 1;
}

//Reset the view radius of the wireframe view
void ResetWireframeViewRad()
{
	Wireframe_view->rad = DEFAULT_VIEW_RAD;
	Edview_changed = 1;
}

//Set the wireframe view target to a specific location
//Does not reset the distance or orientation
void SetWireframeView(vector *pos)
{
	Wireframe_view->target = *pos;

	Edview_changed = 1;
}