viewport.h

/******************************************************************************
 *
 * Project:  OpenCPN
 * Purpose:  OpenCPN ViewPort
 * Author:   David Register
 *
 ***************************************************************************
 *   Copyright (C) 2015 by David S. Register   *
 *                                                                         *
 *   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 2 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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,  USA.             *
 ***************************************************************************
 *
 *
 *
 */
 
#ifndef __OCPNVIEWPORT_H__
#define __OCPNVIEWPORT_H__
 
#include "bbox.h"
class OCPNRegion;
class LLRegion;
 
#if !defined(NAN)
static const long long lNaN = 0xfff8000000000000;
#define NAN (*(double *)&lNaN)
#endif
 
#if 0
//    ChartType constants
typedef enum ChartTypeEnum
{
      CHART_TYPE_UNKNOWN = 0,
      CHART_TYPE_DUMMY,
      CHART_TYPE_DONTCARE,
      CHART_TYPE_KAP,
      CHART_TYPE_GEO,
      CHART_TYPE_S57,
      CHART_TYPE_CM93,
      CHART_TYPE_CM93COMP,
      CHART_TYPE_PLUGIN
}_ChartTypeEnum;
 
//    ChartFamily constants
typedef enum ChartFamilyEnum
{
      CHART_FAMILY_UNKNOWN = 0,
      CHART_FAMILY_RASTER,
      CHART_FAMILY_VECTOR,
      CHART_FAMILY_DONTCARE
}_ChartFamilyEnum;
 
typedef enum ColorScheme
{
      GLOBAL_COLOR_SCHEME_RGB,
      GLOBAL_COLOR_SCHEME_DAY,
      GLOBAL_COLOR_SCHEME_DUSK,
      GLOBAL_COLOR_SCHEME_NIGHT,
      N_COLOR_SCHEMES
}_ColorScheme;
#endif
 
#define INVALID_COORD (-2147483647 - 1)
 
//----------------------------------------------------------------------------
// ViewPort Definition
//----------------------------------------------------------------------------
class ViewPort {
public:
  ViewPort();
 
  wxPoint GetPixFromLL(double lat, double lon);
  void GetLLFromPix(const wxPoint &p, double *lat, double *lon) {
    GetLLFromPix(wxPoint2DDouble(p), lat, lon);
  }
  void GetLLFromPix(const wxPoint2DDouble &p, double *lat, double *lon);
  wxPoint2DDouble GetDoublePixFromLL(double lat, double lon);
 
  LLRegion GetLLRegion(const OCPNRegion &region);
  OCPNRegion GetVPRegionIntersect(const OCPNRegion &region,
                                  const LLRegion &llregion,
                                  int chart_native_scale);
  OCPNRegion GetVPRegionIntersect(const OCPNRegion &Region, int nPoints,
                                  float *llpoints, int chart_native_scale,
                                  wxPoint *ppoints);
  wxRect GetVPRectIntersect(size_t n, float *llpoints);
  ViewPort BuildExpandedVP(int width, int height);
 
  void SetBoxes(void);
  void PixelScale(float factor);
 
  //  Accessors
  void Invalidate() { bValid = false; }
  void Validate() { bValid = true; }
  bool IsValid() const { return bValid; }
 
  void SetRotationAngle(double angle_rad) { rotation = angle_rad; }
  void SetProjectionType(int type) { m_projection_type = type; }
 
  LLBBox &GetBBox() { return vpBBox; }
 
  void SetBBoxDirect(const LLBBox &bbox) { vpBBox = bbox; }
  void SetBBoxDirect(double latmin, double lonmin, double latmax,
                     double lonmax);
 
  void InvalidateTransformCache() { lat0_cache = NAN; }
 
  //  Generic
  double clat;  // center point
  double clon;
  double view_scale_ppm;
  double skew;
  double rotation;
  double tilt;  // For perspective view
 
  double chart_scale;  // conventional chart displayed scale
  double
      ref_scale;  //  the nominal scale of the "reference chart" for this view
 
  int pix_width;
  int pix_height;
 
  bool b_quilt;
  bool b_FullScreenQuilt;
 
  int m_projection_type;
  bool b_MercatorProjectionOverride;
  wxRect rv_rect;
 
//#ifdef USE_ANDROID_GLES2
  float vp_matrix_transform[16];
  float norm_transform[16];
//#endif
 
  bool operator==(const ViewPort& rhs) const
  {
    return (clat == rhs.clat)
      && (clon == rhs.clon)
      && (view_scale_ppm == rhs.view_scale_ppm)
      && (skew == rhs.skew)
      && (rotation == rhs.rotation)
      && (tilt == rhs.tilt)
      && (chart_scale == rhs.chart_scale)
      && (ref_scale == rhs.ref_scale)
      && (pix_width == rhs.pix_width)
      && (pix_height == rhs.pix_height)
      && (b_quilt == rhs.b_quilt)
      && (b_FullScreenQuilt == rhs.b_FullScreenQuilt)
      && (m_projection_type == rhs.m_projection_type)
      && (b_MercatorProjectionOverride == rhs.b_MercatorProjectionOverride);
  }
private:
  LLBBox vpBBox;  // An un-skewed rectangular lat/lon bounding box
                  // which contains the entire vieport
 
  bool bValid;  // This VP is valid
 
  double lat0_cache, cache0, cache1;
};
 
#endif