/*
Copyright (C) 1999-2006 Id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant 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 of the License, or
(at your option) any later version.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

//-----------------------------------------------------------------------------
//
// DESCRIPTION:
// a class to provide basic services for 2D view of a world
// window <-> local 2D space transforms
// snap to grid
// TODO: this one can be placed under an interface, and provided to the editor as a service

#include "StdAfx.h"

static void view_ZoomIn (GtkWidget* widget, gpointer data)
{
  ((C2DView*)data)->ZoomIn ();
}

static void view_ZoomOut (GtkWidget* widget, gpointer data)
{
  ((C2DView*)data)->ZoomOut ();
}

void C2DView::PreparePaint()
{
  g_QglTable.m_pfn_qglClearColor( 0, 0, 0, 0 );
  g_QglTable.m_pfn_qglViewport( 0, 0, m_rect.right, m_rect.bottom );
  g_QglTable.m_pfn_qglMatrixMode( GL_PROJECTION );
  g_QglTable.m_pfn_qglLoadIdentity();
  g_QglTable.m_pfn_qglOrtho( m_Mins[0], m_Maxs[0], m_Maxs[1], m_Mins[1], -1, 1 );	
}

void C2DView::SpaceForWindow( float c[2], int x, int y)
{
  c[0] = ((float)(x))/((float)(m_rect.right-m_rect.left))*(m_Maxs[0]-m_Mins[0])+m_Mins[0];
  c[1] = ((float)(y))/((float)(m_rect.bottom-m_rect.top))*(m_Maxs[1]-m_Mins[1])+m_Mins[1];
}

void C2DView::GridForWindow( float c[2], int x, int y)
{
  SpaceForWindow( c, x, y );
  if ( !m_bDoGrid )
    return;
  c[0] /= m_GridStep[0];
  c[1] /= m_GridStep[1];
  c[0] = (float)floor( c[0] + 0.5f );
  c[1] = (float)floor( c[1] + 0.5f );
  c[0] *= m_GridStep[0];
  c[1] *= m_GridStep[1];
}

void C2DView::WindowForSpace( int &x, int &y, const float c[2] )
{
  x = m_rect.left + (int)( ((float)(m_rect.right-m_rect.left))*(c[0]-m_Mins[0])/(m_Maxs[0]-m_Mins[0]) );
  y = m_rect.top + (int)( ((float)(m_rect.bottom-m_rect.top))*(c[1]-m_Mins[1])/(m_Maxs[1]-m_Mins[1]) );
}

qboolean C2DView::DoesSelect( int x, int y, float c[2] )
{
  int xc,yc;
  WindowForSpace( xc, yc, c );
  if ( abs(xc-x)<=3 && abs(yc-y)<=3 )
    return true;
  return false;
}

void C2DView::ZoomIn()
{
  m_Mins[0] = 0.5f * ( m_Mins[0] - m_Center[0] ) + m_Center[0];
  m_Mins[1] = 0.5f * ( m_Mins[1] - m_Center[1] ) + m_Center[1];
  m_Maxs[0] = 0.5f * ( m_Maxs[0] - m_Center[0] ) + m_Center[0];
  m_Maxs[1] = 0.5f * ( m_Maxs[1] - m_Center[1] ) + m_Center[1];
  g_pToolWnd->Redraw ();
}

void C2DView::ZoomOut()
{
  m_Mins[0] = 2.0f * ( m_Mins[0] - m_Center[0] ) + m_Center[0];
  m_Mins[1] = 2.0f * ( m_Mins[1] - m_Center[1] ) + m_Center[1];
  m_Maxs[0] = 2.0f * ( m_Maxs[0] - m_Center[0] ) + m_Center[0];
  m_Maxs[1] = 2.0f * ( m_Maxs[1] - m_Center[1] ) + m_Center[1];
  g_pToolWnd->Redraw ();
}

bool C2DView::OnRButtonDown (int x, int y)
{
  if (ViewState == View_Idle)
  {
    m_xPosMove = x; // horizontal position of cursor
    m_yPosMove = y; // vertical position of cursor
    // store
    m_MinsMove[0] = m_Mins[0]; m_MinsMove[1] = m_Mins[1];
    m_MaxsMove[0] = m_Maxs[0]; m_MaxsMove[1] = m_Maxs[1];
    ViewState = View_Move;
    // set popup to true
    m_bPopup = true;
    return true;
  }
  return false;
}

bool C2DView::OnRButtonUp (int x, int y)
{
  if (ViewState == View_Move)
  {
    // maybe it's time for popup menu
    if (m_bPopup)
    {
      GtkWidget *menu, *item;

      menu = gtk_menu_new ();

      item = gtk_menu_item_new_with_label ("Validate (RETURN)");
      gtk_signal_connect (GTK_OBJECT (item), "activate", GTK_SIGNAL_FUNC (Textool_Validate), NULL);
      gtk_widget_show (item);
      gtk_menu_append (GTK_MENU (menu), item);

      item = gtk_menu_item_new_with_label ("Zoom in (INSERT)");
      gtk_signal_connect (GTK_OBJECT (item), "activate", GTK_SIGNAL_FUNC (view_ZoomIn), this);
      gtk_widget_show (item);
      gtk_menu_append (GTK_MENU (menu), item);

      item = gtk_menu_item_new_with_label ("Zoom out (DELETE)");
      gtk_signal_connect (GTK_OBJECT (item), "activate", GTK_SIGNAL_FUNC (view_ZoomOut), this);
      gtk_widget_show (item);
      gtk_menu_append (GTK_MENU (menu), item);

      item = gtk_menu_item_new_with_label ("Cancel (ESC)");
      gtk_signal_connect (GTK_OBJECT (item), "activate", GTK_SIGNAL_FUNC (Textool_Cancel), NULL);
      gtk_widget_show (item);
      gtk_menu_append (GTK_MENU (menu), item);

      gtk_menu_popup (GTK_MENU (menu), NULL, NULL, NULL, NULL, 1, GDK_CURRENT_TIME);
    }

    // back to Idle mode
    ViewState = View_Idle;
    return true;
  }
  return false;
}

bool C2DView::OnMouseMove (int xPos, int yPos)
{
  if (ViewState == View_Move)
  {
    float V[2];
    // V is the offset
    V[0] = ((float)( xPos - m_xPosMove )) * ( m_MaxsMove[0] - m_MinsMove[0] ) / ((float)( m_rect.left - m_rect.right ));
    V[1] = ((float)( yPos - m_yPosMove )) * ( m_MaxsMove[1] - m_MinsMove[1] ) / ((float)( m_rect.top - m_rect.bottom ));
    // update m_Mins m_Maxs and m_Center
    m_Mins[0] = m_MinsMove[0] + V[0];
    m_Mins[1] = m_MinsMove[1] + V[1];
    m_Maxs[0] = m_MaxsMove[0] + V[0];
    m_Maxs[1] = m_MaxsMove[1] + V[1];
    m_Center[0] = 0.5f * ( m_Mins[0] + m_Maxs[0] );
    m_Center[1] = 0.5f * ( m_Mins[1] + m_Maxs[1] );
    // no popup menu if we moved
    m_bPopup = false;
    // send a repaint message
    g_pToolWnd->Redraw ();
    return true;
  }
  return false;
}

bool C2DView::OnKeyDown (char *s)
{
  if (ViewState == View_Idle)
  {
    if (!strcmp(s,"Insert"))
    {
      ZoomOut();
      return true;
    }
    if (!strcmp(s,"Delete"))
    {
      ZoomIn();
      return true;
    }
  }
  return false;
}