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/*=========================================================================
Program: Visualization Toolkit
Module: vtkMarkerUtilities.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 "vtkMarkerUtilities.h"
#include "vtkImageData.h"
//-----------------------------------------------------------------------------
vtkMarkerUtilities::vtkMarkerUtilities()
{
}
//-----------------------------------------------------------------------------
vtkMarkerUtilities::~vtkMarkerUtilities()
{
}
//-----------------------------------------------------------------------------
void vtkMarkerUtilities::GenerateMarker(vtkImageData *data, int style, int width)
{
if (!data)
{
return;
}
data->SetExtent(0, width-1, 0, width-1, 0, 0);
data->AllocateScalars(VTK_UNSIGNED_CHAR, 4);
unsigned char* image =
static_cast<unsigned char*>(data->GetScalarPointer());
// Generate the marker image at the required size
switch (style)
{
case vtkMarkerUtilities::CROSS:
{
for (int i = 0; i < width; ++i)
{
for (int j = 0; j < width; ++j)
{
unsigned char color = 0;
if (i == j || i == width-j)
{
color = 255;
}
image[4*width*i + 4*j] = image[4*width*i + 4*j + 1] =
image[4*width*i + 4*j + 2] = color;
image[4*width*i + 4*j + 3] = color;
}
}
break;
}
case vtkMarkerUtilities::PLUS:
{
int x = width / 2;
int y = width / 2;
for (int i = 0; i < width; ++i)
{
for (int j = 0; j < width; ++j)
{
unsigned char color = 0;
if (i == x || j == y)
{
color = 255;
}
image[4*width*i + 4*j] = image[4*width*i + 4*j + 1] =
image[4*width*i + 4*j + 2] = color;
image[4*width*i + 4*j + 3] = color;
}
}
break;
}
case vtkMarkerUtilities::SQUARE:
{
for (int i = 0; i < width; ++i)
{
for (int j = 0; j < width; ++j)
{
unsigned char color = 255;
image[4*width*i + 4*j] = image[4*width*i + 4*j + 1] =
image[4*width*i + 4*j + 2] = color;
image[4*width*i + 4*j + 3] = color;
}
}
break;
}
case vtkMarkerUtilities::CIRCLE:
{
double c = (width - 1.0)/2.0;
for (int i = 0; i < width; ++i)
{
double dx2 = (i - c)*(i-c);
for (int j = 0; j < width; ++j)
{
double dy2 = (j - c)*(j - c);
unsigned char color = 0;
double dist = sqrt(dx2 + dy2);
if (dist < c - 0.5)
{
color = 255;
}
else if (dist > c + 0.5)
{
color = 0;
}
else
{
double frac = 1.0 - (dist - (c - 0.5));
frac = std::min(1.0, std::max(0.0, frac));
color = static_cast<unsigned char>(255*frac);
}
image[4*width*i + 4*j] = image[4*width*i + 4*j + 1] =
image[4*width*i + 4*j + 2] = 255;
image[4*width*i + 4*j + 3] = color;
}
}
break;
}
case vtkMarkerUtilities::DIAMOND:
{
int c = (width - 1)/2;
for (int i = 0; i < width; ++i)
{
int dx = i-c > 0 ? i-c : c-i;
for (int j = 0; j < width; ++j)
{
int dy = j-c > 0 ? j-c : c-j;
unsigned char color = 0;
if (c-dx > dy)
{
color = 255;
}
else if (c-dx == dy)
{
if (dx == 0 || dy == 0)
{
color = 64;
}
else
{
color = 128;
}
}
image[4*width*i + 4*j] = image[4*width*i + 4*j + 1] =
image[4*width*i + 4*j + 2] = 255;
image[4*width*i + 4*j + 3] = color;
}
}
break;
}
default:
{
int x = width / 2;
int y = width / 2;
for (int i = 0; i < width; ++i)
{
for (int j = 0; j < width; ++j)
{
unsigned char color = 0;
if (i == x || j == y)
{
color = 255;
}
image[4*width*i + 4*j] = image[4*width*i + 4*j + 1] =
image[4*width*i + 4*j + 2] = color;
image[4*width*i + 4*j + 3] = color;
}
}
}
}
}
//-----------------------------------------------------------------------------
void vtkMarkerUtilities::PrintSelf(ostream &os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
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