ocpn_print.cpp

/***************************************************************************
 *
 * Project:  OpenCPN
 * Purpose:  Implement ocpn_print.h
 * Author:   David Register
 *
 ***************************************************************************
 *   Copyright (C) 2010 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.         *
 **************************************************************************/
#include "config.h"
 
#include "chcanv.h"
#include "glChartCanvas.h"
#include "ocpn_frame.h"
#include "ocpn_print.h"
 
extern bool g_bopengl;
extern MyFrame* gFrame;
 
class ChartCanvas;
ChartCanvas* GetFocusCanvas();
 
 
bool MyPrintout::OnPrintPage(int page) {
  wxDC *dc = GetDC();
  if (dc) {
    if (page == 1) DrawPageOne(dc);
 
    return true;
  } else
    return false;
}
 
bool MyPrintout::OnBeginDocument(int startPage, int endPage) {
  if (!wxPrintout::OnBeginDocument(startPage, endPage)) return false;
 
  return true;
}
 
void MyPrintout::GetPageInfo(int* minPage, int* maxPage, int* selPageFrom,
                             int* selPageTo) {
  *minPage = 1;
  *maxPage = 1;
  *selPageFrom = 1;
  *selPageTo = 1;
}
 
bool MyPrintout::HasPage(int pageNum) { return (pageNum == 1); }
 
void MyPrintout::DrawPageOne(wxDC *dc) {
  // Get the Size of the Chart Canvas
  int sx, sy;
  gFrame->GetFocusCanvas()->GetClientSize(&sx, &sy);  // of the canvas
 
  float maxX = sx;
  float maxY = sy;
 
  // Let's have at least some device units margin
  float marginX = 50;
  float marginY = 50;
 
  // Add the margin to the graphic size
  maxX += (2 * marginX);
  maxY += (2 * marginY);
 
  // Get the size of the DC in pixels
  int w, h;
  dc->GetSize(&w, &h);
 
  // Calculate a suitable scaling factor
  float scaleX = (float)(w / maxX);
  float scaleY = (float)(h / maxY);
 
  // Use x or y scaling factor, whichever fits on the DC
  float actualScale = wxMin(scaleX, scaleY);
 
  // Calculate the position on the DC for centring the graphic
  float posX = (float)((w - (maxX * actualScale)) / 2.0);
  float posY = (float)((h - (maxY * actualScale)) / 2.0);
 
  posX = wxMax(posX, marginX);
  posY = wxMax(posY, marginY);
 
  // Set the scale and origin
  dc->SetUserScale(actualScale, actualScale);
  dc->SetDeviceOrigin((long)posX, (long)posY);
 
  //  Get the latest bitmap as rendered by the ChartCanvas
 
  if (g_bopengl) {
#ifdef ocpnUSE_GL
    if (m_GLbmp.IsOk()) {
      wxMemoryDC mdc;
      mdc.SelectObject(m_GLbmp);
      dc->Blit(0, 0, m_GLbmp.GetWidth(), m_GLbmp.GetHeight(), &mdc, 0, 0);
      mdc.SelectObject(wxNullBitmap);
    }
#endif
  } else {
    //  And Blit/scale it onto the Printer DC
    wxMemoryDC mdc;
    mdc.SelectObject(*(gFrame->GetFocusCanvas()->pscratch_bm));
 
    dc->Blit(0, 0, gFrame->GetFocusCanvas()->pscratch_bm->GetWidth(),
             gFrame->GetFocusCanvas()->pscratch_bm->GetHeight(), &mdc, 0, 0);
 
    mdc.SelectObject(wxNullBitmap);
  }
}
 
void MyPrintout::GenerateGLbmp() {
  if (g_bopengl) {
#ifdef ocpnUSE_GL
    int gsx = gFrame->GetFocusCanvas()->GetglCanvas()->GetSize().x;
    int gsy = gFrame->GetFocusCanvas()->GetglCanvas()->GetSize().y;
 
    unsigned char *buffer = (unsigned char *)malloc(gsx * gsy * 4);
    glReadPixels(0, 0, gsx, gsy, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
 
    unsigned char *e = (unsigned char *)malloc(gsx * gsy * 3);
 
    if (buffer && e) {
      for (int p = 0; p < gsx * gsy; p++) {
        e[3 * p + 0] = buffer[4 * p + 0];
        e[3 * p + 1] = buffer[4 * p + 1];
        e[3 * p + 2] = buffer[4 * p + 2];
      }
    }
    free(buffer);
 
    wxImage image(gsx, gsy);
    image.SetData(e);
    wxImage mir_imag = image.Mirror(false);
    m_GLbmp = wxBitmap(mir_imag);
#endif
  }
}