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

  Program:   Visualization Toolkit
  Module:    vtkContext2D.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

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

#include "vtkContext2D.h"

#include "vtkPoints2D.h"
#include "vtkVector.h"
#include "vtkTransform2D.h"
#include "vtkContextDevice2D.h"
#include "vtkPen.h"
#include "vtkBrush.h"
#include "vtkTextProperty.h"
#include "vtkFloatArray.h"
#include "vtkUnsignedCharArray.h"

#include "vtkObjectFactory.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"

#include <cassert>


//-----------------------------------------------------------------------------
vtkStandardNewMacro(vtkContext2D);

//-----------------------------------------------------------------------------
bool vtkContext2D::Begin(vtkContextDevice2D *device)
{
  if (this->Device == device)
    {
    //Handle the case where the same device is set multiple times
    return true;
    }
  else if (this->Device)
    {
    this->Device->Delete();
    }
  this->Device = device;
  this->Device->Register(this);
  this->Modified();
  return true;
}

//-----------------------------------------------------------------------------
bool vtkContext2D::End()
{
  if (this->Device)
    {
    this->Device->End();
    this->Device->Delete();
    this->Device = NULL;
    this->Modified();
    return true;
    }
  return true;
}

// ----------------------------------------------------------------------------
bool vtkContext2D::GetBufferIdMode() const
{
  return this->BufferId!=0;
}

// ----------------------------------------------------------------------------
void vtkContext2D::BufferIdModeBegin(vtkAbstractContextBufferId *bufferId)
{
  assert("pre: not_yet" && !this->GetBufferIdMode());
  assert("pre: bufferId_exists" && bufferId!=0);

  this->BufferId=bufferId;
  this->Device->BufferIdModeBegin(bufferId);

  assert("post: started" && this->GetBufferIdMode());
}

// ----------------------------------------------------------------------------
void vtkContext2D::BufferIdModeEnd()
{
  assert("pre: started" && this->GetBufferIdMode());

  this->Device->BufferIdModeEnd();
  this->BufferId=0;

  assert("post: done" && !this->GetBufferIdMode());
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawLine(float x1, float y1, float x2, float y2)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  float x[] = { x1, y1, x2, y2 };
  this->Device->DrawPoly(&x[0], 2);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawLine(float p[4])
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  this->Device->DrawPoly(&p[0], 2);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawLine(vtkPoints2D *points)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  if (points->GetNumberOfPoints() < 2)
    {
    vtkErrorMacro(<< "Attempted to paint a line with <2 points.");
    return;
    }
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->Device->DrawPoly(f, 2);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoly(float *x, float *y, int n)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  float *p = new float[2*n];
  for (int i = 0; i < n; ++i)
    {
    p[2*i]   = x[i];
    p[2*i+1] = y[i];
    }
  this->Device->DrawPoly(p, n);
  delete[] p;
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoly(vtkPoints2D *points)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  // If the points are of type float then call OpenGL directly
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->DrawPoly(f, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoly(float *points, int n)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  if (n < 2)
    {
    vtkErrorMacro(<< "Attempted to paint a line with <2 points.");
    return;
    }
  this->Device->DrawPoly(points, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoly(float *points, int n,
                            unsigned char *colors, int nc_comps)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  if (n < 2)
    {
    vtkErrorMacro(<< "Attempted to paint a line with <2 points.");
    return;
    }
  this->Device->DrawPoly(points, n, colors, nc_comps);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawLines(vtkPoints2D *points)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  // If the points are of type float then call OpenGL directly
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->DrawLines(f, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawLines(float *points, int n)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  if (n < 2)
    {
    vtkErrorMacro(<< "Attempted to paint a line with <2 points.");
    return;
    }
  this->Device->DrawLines(points, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoint(float x, float y)
{
  float p[] = { x, y };
  this->DrawPoints(&p[0], 1);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoints(float *x, float *y, int n)
{
  // Copy the points into an array and draw it.
  float *p = new float[2*n];
  for (int i = 0; i < n; ++i)
    {
    p[2*i]   = x[i];
    p[2*i+1] = y[i];
    }
  this->DrawPoints(&p[0], n);
  delete[] p;
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoints(vtkPoints2D *points)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  // If the points are of type float then call OpenGL directly
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->DrawPoints(f, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPoints(float *points, int n)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  this->Device->DrawPoints(points, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPointSprites(vtkImageData *sprite, vtkPoints2D *points)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  // If the points are of type float then call OpenGL directly
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->DrawPointSprites(sprite, f, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPointSprites(vtkImageData *sprite, vtkPoints2D *points,
         vtkUnsignedCharArray *colors)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  int nc = static_cast<int>(colors->GetNumberOfTuples());
  if (n != nc)
    {
    vtkErrorMacro(<< "Attempted to color points with array of wrong length");
    return;
    }
  int nc_comps = static_cast<int>(colors->GetNumberOfComponents());
  // If the points are of type float then call OpenGL directly
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  unsigned char *c = colors->GetPointer(0);
  this->DrawPointSprites(sprite, f, n, c, nc_comps);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPointSprites(vtkImageData *sprite, float *points, int n,
         unsigned char *colors, int nc_comps)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  this->Device->DrawPointSprites(sprite, points, n, colors, nc_comps);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPointSprites(vtkImageData *sprite, float *points, int n)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  this->Device->DrawPointSprites(sprite, points, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMarkers(int shape, bool highlight, float *points, int n,
                               unsigned char *colors, int nc_comps)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  this->Device->DrawMarkers(shape, highlight, points, n, colors, nc_comps);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMarkers(int shape, bool highlight, float *points, int n)
{
  this->DrawMarkers(shape, highlight, points, n, NULL, 0);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMarkers(int shape, bool highlight, vtkPoints2D *points)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->DrawMarkers(shape, highlight, f, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMarkers(int shape, bool highlight, vtkPoints2D *points, vtkUnsignedCharArray *colors)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  int nc = static_cast<int>(colors->GetNumberOfTuples());
  if (n != nc)
    {
    vtkErrorMacro(<< "Attempted to color points with array of wrong length");
    return;
    }
  int nc_comps = static_cast<int>(colors->GetNumberOfComponents());
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  unsigned char *c = colors->GetPointer(0);
  this->DrawMarkers(shape, highlight, f, n, c, nc_comps);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawRect(float x, float y, float width, float height)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  float p[] = { x,       y,
                x+width, y,
                x+width, y+height,
                x,       y+height,
                x,       y};

  // Draw the filled area of the rectangle.
  this->Device->DrawQuad(&p[0], 4);

  // Draw the outline now.
  this->Device->DrawPoly(&p[0], 5);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawQuad(float x1, float y1, float x2, float y2,
                            float x3, float y3, float x4, float y4)
{
  float p[] = { x1, y1, x2, y2, x3, y3, x4, y4 };
  this->DrawQuad(&p[0]);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawQuad(float *p)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }

  // Draw the filled area of the quad.
  this->Device->DrawQuad(p, 4);

  // Draw the outline now.
  this->Device->DrawPoly(p, 4);
  float closeLine[] = { p[0], p[1], p[6], p[7] };
  this->Device->DrawPoly(&closeLine[0], 2);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawQuadStrip(vtkPoints2D *points)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  // If the points are of type float then call OpenGL directly
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->DrawQuadStrip(f, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawQuadStrip(float *points, int n)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  // Draw the filled area of the polygon.
  this->Device->DrawQuadStrip(points, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPolygon(float *x, float *y, int n)
{
  // Copy the points into an array and draw it.
  float *p = new float[2*n];
  for (int i = 0; i < n; ++i)
    {
    p[2*i]   = x[i];
    p[2*i+1] = y[i];
    }
  this->DrawPolygon(&p[0], n);
  delete[] p;}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPolygon(vtkPoints2D *points)
{
  // Construct an array with the correct coordinate packing for OpenGL.
  int n = static_cast<int>(points->GetNumberOfPoints());
  // If the points are of type float then call OpenGL directly
  float *f = vtkFloatArray::SafeDownCast(points->GetData())->GetPointer(0);
  this->DrawPolygon(f, n);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawPolygon(float *points, int n)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  // Draw the filled area of the polygon.
  this->Device->DrawPolygon(points, n);

  // Draw the outline now.
  this->Device->DrawPoly(points, n);
  float closeLine[] = { points[0], points[1], points[2*n-2], points[2*n-1] };
  this->Device->DrawPoly(&closeLine[0], 2);
}


//-----------------------------------------------------------------------------
void vtkContext2D::DrawEllipse(float x, float y, float rx, float ry)
{
  assert("pre: positive_rx" && rx>=0);
  assert("pre: positive_ry" && ry>=0);
  this->DrawEllipticArc(x, y, rx, ry, 0.0, 360.0);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawWedge(float x, float y, float outRadius,
                             float inRadius,float startAngle,
                             float stopAngle)

{
  assert("pre: positive_outRadius" && outRadius>=0.0f);
  assert("pre: positive_inRadius" && inRadius>=0.0f);
  assert("pre: ordered_radii" && inRadius<=outRadius);

  this->DrawEllipseWedge(x,y,outRadius,outRadius,inRadius,inRadius,startAngle,
    stopAngle);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawEllipseWedge(float x, float y, float outRx, float outRy,
                                    float inRx, float inRy, float startAngle,
                                    float stopAngle)

{
  assert("pre: positive_outRx" && outRx>=0.0f);
  assert("pre: positive_outRy" && outRy>=0.0f);
  assert("pre: positive_inRx" && inRx>=0.0f);
  assert("pre: positive_inRy" && inRy>=0.0f);
  assert("pre: ordered_rx" && inRx<=outRx);
  assert("pre: ordered_ry" && inRy<=outRy);

  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  // don't tessellate here. The device context knows what to do with an
  // arc. An OpenGL device context will tessellate but and SVG context with
  // just generate an arc.
  this->Device->DrawEllipseWedge(x,y,outRx,outRy,inRx,inRy,startAngle,
                                 stopAngle);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawArc(float x, float y, float r, float startAngle,
                           float stopAngle)
{
  assert("pre: positive_radius" && r>=0);
  this->DrawEllipticArc(x,y,r,r,startAngle,stopAngle);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawEllipticArc(float x, float y, float rX, float rY,
                                   float startAngle, float stopAngle)
{
  assert("pre: positive_rX" && rX>=0);
  assert("pre: positive_rY" && rY>=0);

  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  // don't tessellate here. The device context knows what to do with an
  // arc. An OpenGL device context will tessellate but and SVG context with
  // just generate an arc.
  this->Device->DrawEllipticArc(x,y,rX,rY,startAngle,stopAngle);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawStringRect(vtkPoints2D *rect, const vtkStdString &string)
{
  vtkVector2f p = this->CalculateTextPosition(rect);
  this->DrawString(p.GetX(), p.GetY(), string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawStringRect(vtkPoints2D *rect,
                                  const vtkUnicodeString &string)
{
  vtkVector2f p = this->CalculateTextPosition(rect);
  this->DrawString(p.GetX(), p.GetY(), string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawStringRect(vtkPoints2D *rect, const char* string)
{
  this->DrawStringRect(rect, vtkStdString(string));
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawString(vtkPoints2D *point, const vtkStdString &string)
{
  float *f = vtkFloatArray::SafeDownCast(point->GetData())->GetPointer(0);
  this->DrawString(f[0], f[1], string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawString(float x, float y, const vtkStdString &string)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  if (string.empty())
    {
    return;
    }
  float f[] = { x, y };
  this->Device->DrawString(f, string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawString(vtkPoints2D *point, const vtkUnicodeString &string)
{
  float *f = vtkFloatArray::SafeDownCast(point->GetData())->GetPointer(0);
  this->DrawString(f[0], f[1], string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawString(float x, float y, const vtkUnicodeString &string)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  if (string.empty())
    {
    return;
    }
  float f[] = { x, y };
  this->Device->DrawString(&f[0], string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawString(vtkPoints2D *point, const char* string)
{
  float *f = vtkFloatArray::SafeDownCast(point->GetData())->GetPointer(0);
  this->DrawString(f[0], f[1], vtkStdString(string));
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawString(float x, float y, const char* string)
{
  this->DrawString(x, y, vtkStdString(string));
}

//-----------------------------------------------------------------------------
void vtkContext2D::ComputeStringBounds(const vtkStdString &string,
                                       vtkPoints2D *bounds)
{
  bounds->SetNumberOfPoints(2);
  float *f = vtkFloatArray::SafeDownCast(bounds->GetData())->GetPointer(0);
  this->ComputeStringBounds(string, f);
}

//-----------------------------------------------------------------------------
void vtkContext2D::ComputeStringBounds(const vtkStdString &string,
                                       float bounds[4])
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  this->Device->ComputeStringBounds(string, bounds);
}

//-----------------------------------------------------------------------------
void vtkContext2D::ComputeStringBounds(const vtkUnicodeString &string,
                                       vtkPoints2D *bounds)
{
  bounds->SetNumberOfPoints(2);
  float *f = vtkFloatArray::SafeDownCast(bounds->GetData())->GetPointer(0);
  this->ComputeStringBounds(string, f);
}

//-----------------------------------------------------------------------------
void vtkContext2D::ComputeStringBounds(const vtkUnicodeString &string,
                                       float bounds[4])
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  this->Device->ComputeStringBounds(string, bounds);
}

//-----------------------------------------------------------------------------
void vtkContext2D::ComputeStringBounds(const char* string,
                                       vtkPoints2D *bounds)
{
  this->ComputeStringBounds(vtkStdString(string), bounds);
}

//-----------------------------------------------------------------------------
void vtkContext2D::ComputeStringBounds(const char* string,
                                       float bounds[4])
{
  this->ComputeStringBounds(vtkStdString(string), bounds);
}

//-----------------------------------------------------------------------------
void vtkContext2D::ComputeJustifiedStringBounds(const char* string, float bounds[4])
{
  this->ComputeStringBounds(string, bounds);

  // Shift according to the text property justification
  vtkTextProperty* textProp = this->Device->GetTextProp();
  if (textProp->GetJustification() == VTK_TEXT_CENTERED)
    {
    bounds[0] -= 0.5f*bounds[2];
    }
  else if (textProp->GetJustification() == VTK_TEXT_RIGHT)
    {
    bounds[0] -= bounds[2];
    }

  if (textProp->GetVerticalJustification() == VTK_TEXT_CENTERED)
    {
    bounds[1] -= 0.5f*bounds[3];
    }
  else if (textProp->GetVerticalJustification() == VTK_TEXT_TOP)
    {
    bounds[1] -= bounds[3];
    }
}

//-----------------------------------------------------------------------------
int vtkContext2D::ComputeFontSizeForBoundedString(const vtkStdString &string,
                                                  float width, float height)
{
  double orientation = this->GetTextProp()->GetOrientation();
  this->GetTextProp()->SetOrientation(0.0);

  float stringBounds[4];
  int currentFontSize = this->GetTextProp()->GetFontSize();
  this->ComputeStringBounds(string, stringBounds);

  // font size is too big
  if (stringBounds[2] > width || stringBounds[3] > height)
    {
    while (stringBounds[2] > width || stringBounds[3] > height)
      {
      --currentFontSize;
      this->GetTextProp()->SetFontSize(currentFontSize);
      this->ComputeStringBounds(string, stringBounds);
      if (currentFontSize < 0)
        {
        this->GetTextProp()->SetFontSize(0);
        return 0;
        }
      }
    }

  // font size is too small
  else
    {
      while (stringBounds[2] < width && stringBounds[3] < height)
      {
      ++currentFontSize;
      this->GetTextProp()->SetFontSize(currentFontSize);
      this->ComputeStringBounds(string, stringBounds);
      }
    --currentFontSize;
    this->GetTextProp()->SetFontSize(currentFontSize);
    }

  this->GetTextProp()->SetOrientation(orientation);
  return currentFontSize;
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(vtkPoints2D *point,
                                      const vtkStdString &string)
{
  float *f = vtkFloatArray::SafeDownCast(point->GetData())->GetPointer(0);
  this->DrawMathTextString(f[0], f[1], string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(float x, float y,
                                      const vtkStdString &string)
{
  if (!this->Device)
    {
    vtkErrorMacro(<< "Attempted to paint with no active vtkContextDevice2D.");
    return;
    }
  if (string.empty())
    {
    return;
    }
  float f[] = { x, y };
  this->Device->DrawMathTextString(f, string);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(vtkPoints2D *point, const char* string)
{
  float *f = vtkFloatArray::SafeDownCast(point->GetData())->GetPointer(0);
  this->DrawMathTextString(f[0], f[1], vtkStdString(string));
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(float x, float y, const char* string)
{
  this->DrawMathTextString(x, y, vtkStdString(string));
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(vtkPoints2D *point,
                                      const vtkStdString &string,
                                      const vtkStdString &fallback)
{
  if (this->Device->MathTextIsSupported())
    {
    this->DrawMathTextString(point, string);
    }
  else
    {
    this->DrawString(point, fallback);
    }
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(float x, float y,
                                      const vtkStdString &string,
                                      const vtkStdString &fallback)
{
  if (this->Device->MathTextIsSupported())
    {
    this->DrawMathTextString(x, y, string);
    }
  else
    {
    this->DrawString(x, y, fallback);
    }
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(vtkPoints2D *point, const char *string,
                                      const char *fallback)
{
  if (this->Device->MathTextIsSupported())
    {
    this->DrawMathTextString(point, string);
    }
  else
    {
    this->DrawString(point, fallback);
    }
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(float x, float y, const char *string,
                                      const char *fallback)
{
  if (this->Device->MathTextIsSupported())
    {
    this->DrawMathTextString(x, y, string);
    }
  else
    {
    this->DrawString(x, y, fallback);
    }
}

//-----------------------------------------------------------------------------
bool vtkContext2D::MathTextIsSupported()
{
  return this->Device->MathTextIsSupported();
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawImage(float x, float y, vtkImageData *image)
{
  float p[] = { x, y };
  this->Device->DrawImage(&p[0], 1.0, image);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawImage(float x, float y, float scale, vtkImageData *image)
{
  float p[] = { x, y };
  this->Device->DrawImage(&p[0], scale, image);
}

//-----------------------------------------------------------------------------
void vtkContext2D::DrawImage(const vtkRectf& pos, vtkImageData *image)
{
  this->Device->DrawImage(pos, image);
}

//-----------------------------------------------------------------------------
void vtkContext2D::ApplyPen(vtkPen *pen)
{
  this->Device->ApplyPen(pen);
}

//-----------------------------------------------------------------------------
vtkPen* vtkContext2D::GetPen()
{
  if (this->Device)
    {
    return this->Device->GetPen();
    }
  return NULL;
}

//-----------------------------------------------------------------------------
void vtkContext2D::ApplyBrush(vtkBrush *brush)
{
  this->Device->ApplyBrush(brush);
}

//-----------------------------------------------------------------------------
vtkBrush* vtkContext2D::GetBrush()
{
  if (this->Device)
    {
    return this->Device->GetBrush();
    }
  return NULL;
}

//-----------------------------------------------------------------------------
void vtkContext2D::ApplyTextProp(vtkTextProperty *prop)
{
  this->Device->ApplyTextProp(prop);
}

//-----------------------------------------------------------------------------
vtkTextProperty* vtkContext2D::GetTextProp()
{
  if (this->Device)
    {
    return this->Device->GetTextProp();
    }
  return NULL;
}

//-----------------------------------------------------------------------------
void vtkContext2D::SetTransform(vtkTransform2D *transform)
{
  if (transform)
    {
    this->Device->SetMatrix(transform->GetMatrix());
    }
}

//-----------------------------------------------------------------------------
vtkTransform2D* vtkContext2D::GetTransform()
{
  if (this->Device && this->Transform)
    {
    this->Device->GetMatrix(this->Transform->GetMatrix());
    return this->Transform;
    }
  return NULL;
}

//-----------------------------------------------------------------------------
void vtkContext2D::AppendTransform(vtkTransform2D *transform)
{
  if(!transform)
    {
    return;
    }

  this->Device->MultiplyMatrix(transform->GetMatrix());
}

//-----------------------------------------------------------------------------
void vtkContext2D::PushMatrix()
{
  this->Device->PushMatrix();
}

//-----------------------------------------------------------------------------
void vtkContext2D::PopMatrix()
{
  this->Device->PopMatrix();
}

// ----------------------------------------------------------------------------
void vtkContext2D::ApplyId(vtkIdType id)
{
  assert("pre: zero_reserved_for_background" && id>0);
  assert("pre: 24bit_limited" && id<16777216);
  unsigned char rgba[4];

  // r most significant bits (16-23).
  // g (8-15)
  // b less significant bits (0-7).

  rgba[0]= static_cast<unsigned char>((id & 0xff0000) >> 16);
  rgba[1]= static_cast<unsigned char>((id & 0xff00) >> 8);
  rgba[2]= static_cast<unsigned char>(id & 0xff);
  rgba[3]=1; // not used (because the colorbuffer in the default framebuffer
  // may not have an alpha channel)

  assert("check: valid_conversion" &&
         static_cast<vtkIdType>((static_cast<int>(rgba[0])<<16)
                                |(static_cast<int>(rgba[1])<<8)
                                |static_cast<int>(rgba[2]))==id);

  this->Device->SetColor4(rgba);
}

void vtkContext2D::SetContext3D(vtkContext3D *context)
{
  this->Context3D = context;
}

//-----------------------------------------------------------------------------
vtkVector2f vtkContext2D::CalculateTextPosition(vtkPoints2D* rect)
{
  if (rect->GetNumberOfPoints() < 2)
    {
    return vtkVector2f();
    }

  float *f = vtkFloatArray::SafeDownCast(rect->GetData())->GetPointer(0);
  return this->CalculateTextPosition(f);
}

//-----------------------------------------------------------------------------
vtkVector2f vtkContext2D::CalculateTextPosition(float rect[4])
{
  // Draw the text at the appropriate point inside the rect for the alignment
  // specified. This is a convenience when an area of the screen should have
  // text drawn that is aligned to the entire area.
  vtkVector2f p(0, 0);

  if (this->Device->GetTextProp()->GetJustification() == VTK_TEXT_LEFT)
    {
    p.SetX(rect[0]);
    }
  else if (this->Device->GetTextProp()->GetJustification() == VTK_TEXT_CENTERED)
    {
    p.SetX(rect[0] + 0.5f*rect[2]);
    }
  else
    {
    p.SetX(rect[0] + rect[2]);
    }

  if (this->Device->GetTextProp()->GetVerticalJustification() == VTK_TEXT_BOTTOM)
    {
    p.SetY(rect[1]);
    }
  else if (this->Device->GetTextProp()->GetVerticalJustification() == VTK_TEXT_CENTERED)
    {
    p.SetY(rect[1] + 0.5f*rect[3]);
    }
  else
    {
    p.SetY(rect[1] + rect[3]);
    }
  return p;
}

//-----------------------------------------------------------------------------
vtkContext2D::vtkContext2D() : Context3D(NULL)
{
  this->Device = NULL;
  this->Transform = vtkTransform2D::New();
  this->BufferId = 0;
}

//-----------------------------------------------------------------------------
vtkContext2D::~vtkContext2D()
{
  if (this->Device)
    {
    this->Device->Delete();
    }
  if (this->Transform)
    {
    this->Transform->Delete();
    }
}

//-----------------------------------------------------------------------------
void vtkContext2D::PrintSelf(ostream &os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "Context Device: ";
  if (this->Device)
    {
    os << endl;
    this->Device->PrintSelf(os, indent.GetNextIndent());
    }
  else
    {
    os << "(none)" << endl;
    }
}
