/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkTextMapper.cxx
  Language:  C++
  Date:      $Date$
  Version:   $Revision$
  Thanks:    Thanks to Matt Turek who developed this class.

Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#include "vtkTextMapper.h"
#include "vtkImagingFactory.h"

// Creates a new text mapper with Font size 12, bold off, italic off,
// and Arial font
vtkTextMapper::vtkTextMapper()
{
  this->Input = (char*) NULL;
  this->FontSize = 12;
  this->Bold = 0;
  this->Italic = 0;
  this->Shadow = 0;
  this->FontFamily = VTK_ARIAL;
  this->Justification = VTK_TEXT_LEFT;
  this->VerticalJustification = VTK_TEXT_BOTTOM;

  this->TextLines = NULL;
  this->NumberOfLines = 0;
  this->NumberOfLinesAllocated = 0;
  this->LineOffset = 0.0;
  this->LineSpacing = 1.0;
}

// Shallow copy of an actor.
void vtkTextMapper::ShallowCopy(vtkTextMapper *tm)
{
  this->SetInput(tm->GetInput());
  this->SetFontSize(tm->GetFontSize());
  this->SetBold(tm->GetBold());
  this->SetItalic(tm->GetItalic());
  this->SetShadow(tm->GetShadow());
  this->SetFontFamily(tm->GetFontFamily());
  this->SetJustification(tm->GetJustification());
  this->SetVerticalJustification(tm->GetVerticalJustification());
}

vtkTextMapper *vtkTextMapper::New()
{
  // First try to create the object from the vtkObjectFactory
  vtkObject* ret = vtkImagingFactory::CreateInstance("vtkTextMapper");
  return (vtkTextMapper*)ret;
}

vtkTextMapper::~vtkTextMapper()
{
  if (this->Input)
    {
    delete [] this->Input;
    this->Input = NULL;
    }

  if ( this->TextLines != NULL )
    {
    for (int i=0; i < this->NumberOfLinesAllocated; i++)
      {
      this->TextLines[i]->Delete();
      }
    delete [] this->TextLines;
    }
  
}

//----------------------------------------------------------------------------
void vtkTextMapper::PrintSelf(ostream& os, vtkIndent indent)
{
  vtkMapper2D::PrintSelf(os,indent);

  os << indent << "Line Offset: " << this->LineOffset;
  os << indent << "Line Spacing: " << this->LineSpacing;
  os << indent << "Bold: " << (this->Bold ? "On\n" : "Off\n");
  os << indent << "Italic: " << (this->Italic ? "On\n" : "Off\n");
  os << indent << "Shadow: " << (this->Shadow ? "On\n" : "Off\n");
  os << indent << "FontFamily: " << this->FontFamily << "\n";
  os << indent << "FontSize: " << this->FontSize << "\n";
  os << indent << "Input: " << (this->Input ? this->Input : "(none)") << "\n";
  os << indent << "Justification: ";
  switch (this->Justification)
    {
    case 0: os << "Left  (0)" << endl; break;
    case 1: os << "Centered  (1)" << endl; break;
    case 2: os << "Right  (2)" << endl; break;
    }
  os << indent << "VerticalJustification: ";
  switch (this->VerticalJustification)
    {
    case VTK_TEXT_TOP: os << "Top" << endl; break;
    case VTK_TEXT_CENTERED: os << "Centered" << endl; break;
    case VTK_TEXT_BOTTOM: os << "Bottom" << endl; break;
    }
  
  os << indent << "NumberOfLines: " << this->NumberOfLines << "\n";  
}

int vtkTextMapper::GetWidth(vtkViewport* viewport)
{
  int size[2];
  this->GetSize(viewport, size);
  return size[0];
}

int vtkTextMapper::GetHeight(vtkViewport* viewport)
{
  int size[2];
  this->GetSize(viewport, size);
  return size[1];
}

// Parse the input and create multiple text mappers if multiple lines
// (delimited by \n) are specified.
void vtkTextMapper::SetInput(char *input)
{
  if ( this->Input && input && (!strcmp(this->Input,input))) 
    {
    return;
    }
  if (this->Input) 
    { 
    delete [] this->Input; 
    }  
  if (input)
    {
    this->Input = new char[strlen(input)+1];
    strcpy(this->Input,input);
    }
  else
    {
    this->Input = NULL;
    }
  this->Modified();
  
  int numLines = this->GetNumberOfLines(input);
  
  if ( numLines <= 1) // a line with no "\n"
    {
    this->NumberOfLines = numLines;
    this->LineOffset = 0.0;
    }

  else //multiple lines
    {
    char *line;
    int i;

    if ( numLines > this->NumberOfLinesAllocated )
      {
      // delete old stuff
      if ( this->TextLines )
        {
        for (i=0; i < this->NumberOfLinesAllocated; i++)
          {
          this->TextLines[i]->Delete();
          }
        delete [] this->TextLines;
        }
      
      // allocate new text mappers
      this->NumberOfLinesAllocated = numLines;
      this->TextLines = new vtkTextMapper *[numLines];
      for (i=0; i < numLines; i++)
        {
        this->TextLines[i] = vtkTextMapper::New();
        }
      } //if we need to reallocate
    
    // set the input strings
    this->NumberOfLines = numLines;
    for (i=0; i < this->NumberOfLines; i++)
      {
      line = this->NextLine(input, i);
      this->TextLines[i]->SetInput( line );
      delete [] line;
      }
    }
}

// Determine the number of lines in the Input string (delimited by "\n").
int vtkTextMapper::GetNumberOfLines(char *input)
{
  if ( input == NULL )
    {
    return 0;
    }

  int numLines=1;
  char *ptr = input;

  while ( ptr != NULL )
    {
    if ( (ptr=strstr(ptr,"\n")) != NULL )
      {
      numLines++;
      ptr++; //skip over \n
      }
    }
  
  return numLines;
}

// Get the next \n delimited line. Returns a string that
// must be freed by the calling function.
char *vtkTextMapper::NextLine(char *input, int lineNum)
{
  char *line, *ptr, *ptrEnd;
  int strLen;

  ptr = input;
  for (int i=0; i != lineNum; i++)
    {
    ptr = strstr(ptr,"\n");
    ptr++;
    }
  ptrEnd = strstr(ptr,"\n");
  if ( ptrEnd == NULL )
    {
    ptrEnd = strchr(ptr, '\0');
    }
  
  strLen = ptrEnd - ptr;
  line = new char[strLen+1];
  strncpy(line, ptr, strLen);
  line[strLen] = '\0';

  return line;
}

// Get the size of a multi-line text string
void vtkTextMapper::GetMultiLineSize(vtkViewport* viewport, int size[2])
{
  int i;
  int lineSize[2];
  
  lineSize[0] = lineSize[1] = size[0] = size[1] = 0;
  for ( i=0; i < this->NumberOfLines; i++ )
    {
    this->TextLines[i]->SetItalic(this->Italic);
    this->TextLines[i]->SetBold(this->Bold);
    this->TextLines[i]->SetShadow(this->Shadow);
    this->TextLines[i]->SetFontSize(this->FontSize);
    this->TextLines[i]->SetFontFamily(this->FontFamily);
    this->TextLines[i]->GetSize(viewport, lineSize);
    size[0] = (lineSize[0] > size[0] ? lineSize[0] : size[0]);
    size[1] = (lineSize[1] > size[1] ? lineSize[1] : size[1]);
    }
  
  // add in the line spacing
  this->LineSize = size[1];
  size[1] = (int)(this->NumberOfLines* this->LineSpacing * size[1]);
}

void vtkTextMapper::RenderOverlayMultipleLines(vtkViewport *viewport, 
                                               vtkActor2D *actor)    
{
  float offset;
  int size[2];
  // make sure LineSize is up to date 
  this->GetMultiLineSize(viewport,size);
  
  switch (this->VerticalJustification)
    {
    case VTK_TEXT_TOP:
      offset = 1.0;
      break;
    case VTK_TEXT_CENTERED:
      offset = -this->NumberOfLines/2.0 + 1;
      break;
    case VTK_TEXT_BOTTOM:
      offset = -(this->NumberOfLines - 1.0);
      break;
    }

  for (int lineNum=0; lineNum < this->NumberOfLines; lineNum++)
    {
    this->TextLines[lineNum]->SetItalic(this->Italic);
    this->TextLines[lineNum]->SetBold(this->Bold);
    this->TextLines[lineNum]->SetShadow(this->Shadow);
    this->TextLines[lineNum]->SetFontSize(this->FontSize);
    this->TextLines[lineNum]->SetFontFamily(this->FontFamily);
    this->TextLines[lineNum]->SetJustification(this->Justification);
    this->TextLines[lineNum]->SetLineOffset(this->LineSize*(lineNum+offset));
    this->TextLines[lineNum]->SetLineSpacing(this->LineSpacing);
    this->TextLines[lineNum]->RenderOverlay(viewport,actor);
    }
}

void vtkTextMapper::RenderOpaqueGeometryMultipleLines(vtkViewport *viewport, 
                                                      vtkActor2D *actor)    
{
  float offset;
  int size[2];
  // make sure LineSize is up to date 
  this->GetMultiLineSize(viewport,size);

  switch (this->VerticalJustification)
    {
    case VTK_TEXT_TOP:
      offset = 1.0;
      break;
    case VTK_TEXT_CENTERED:
      offset = -this->NumberOfLines/2.0 + 1;
      break;
    case VTK_TEXT_BOTTOM:
      offset = -(this->NumberOfLines - 1.0);
      break;
    }

  for (int lineNum=0; lineNum < this->NumberOfLines; lineNum++)
    {
    this->TextLines[lineNum]->SetItalic(this->Italic);
    this->TextLines[lineNum]->SetBold(this->Bold);
    this->TextLines[lineNum]->SetShadow(this->Shadow);
    this->TextLines[lineNum]->SetFontSize(this->FontSize);
    this->TextLines[lineNum]->SetFontFamily(this->FontFamily);
    this->TextLines[lineNum]->SetJustification(this->Justification);
    this->TextLines[lineNum]->SetLineOffset(this->LineSize*(lineNum+offset));
    this->TextLines[lineNum]->SetLineSpacing(this->LineSpacing);
    this->TextLines[lineNum]->RenderOpaqueGeometry(viewport,actor);
    }
}


void vtkTextMapper::SetFontSize(int size)
{
  if (size != this->FontSize)
    {
    this->FontSize = size;
    this->Modified();
    this->FontMTime.Modified();
    }

}

void vtkTextMapper::SetBold(int val)
{
  if (val == this->Bold)
    {
    return;
    }
  this->Bold = val;
  this->Modified();
  this->FontMTime.Modified();
}

void vtkTextMapper::SetItalic(int val)
{
  if (val == this->Italic)
    {
    return;
    }
  this->Italic = val;
  this->Modified();
  this->FontMTime.Modified();
}

void vtkTextMapper::SetShadow(int val)
{
  if (val == this->Shadow)
    {
    return;
    }
  this->Shadow = val;
  this->Modified();
}

void vtkTextMapper::SetFontFamily(int val)
{
  if (val == this->FontFamily)
    {
    return;
    }
  this->FontFamily = val;
  this->Modified();
  this->FontMTime.Modified();
}
