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/*=========================================================================
Program: Visualization Toolkit
Module: vtkQtStringToImage.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 "vtkQtStringToImage.h"
#include "vtkImageData.h"
#include "vtkQImageToImageSource.h"
#include "vtkStdString.h"
#include "vtkTextProperty.h"
#include "vtkVector.h"
#include "vtkObjectFactory.h"
// Qt classes
#include <QApplication>
#include <QFont>
#include <QFontMetrics>
#include <QImage>
#include <QPainter>
#include <QPainterPath>
#include <QPixmap>
#include <QString>
#include <QTextDocument>
#include <QTextStream>
VTK_ABI_NAMESPACE_BEGIN
namespace
{
struct vtkQtLabelMapEntry
{
QString Text;
QColor Color;
QFont Font;
};
} // End of anonymous namespace
class vtkQtStringToImage::Internals
{
public:
QFont TextPropertyToFont(vtkTextProperty* tprop, int dpi)
{
QFont fontSpec(tprop->GetFontFamilyAsString());
fontSpec.setBold(tprop->GetBold());
fontSpec.setItalic(tprop->GetItalic());
fontSpec.setPixelSize(static_cast<int>(tprop->GetFontSize() * (dpi / 72.)));
return fontSpec;
}
QColor TextPropertyToColor(double* fc, double opacity)
{
QColor textColor(static_cast<int>(fc[0] * 255), static_cast<int>(fc[1] * 255),
static_cast<int>(fc[2] * 255), static_cast<int>(opacity * 255));
return textColor;
}
};
//------------------------------------------------------------------------------
vtkStandardNewMacro(vtkQtStringToImage);
//------------------------------------------------------------------------------
vtkQtStringToImage::vtkQtStringToImage()
{
this->Implementation = new Internals;
this->QImageToImage = vtkSmartPointer<vtkQImageToImageSource>::New();
}
//------------------------------------------------------------------------------
vtkQtStringToImage::~vtkQtStringToImage()
{
delete this->Implementation;
}
//------------------------------------------------------------------------------
vtkVector2i vtkQtStringToImage::GetBounds(
vtkTextProperty* property, const vtkStdString& string, int dpi)
{
vtkVector2i recti(0, 0);
if (!QApplication::instance())
{
vtkErrorMacro("You must initialize a QApplication before using this class.");
return recti;
}
if (!property)
{
return recti;
}
QFont fontSpec = this->Implementation->TextPropertyToFont(property, dpi);
QString text(string.c_str());
QRectF rect;
QPainterPath path;
path.addText(0, 0, fontSpec, text);
rect = path.boundingRect();
recti.SetX(static_cast<int>(rect.width()));
recti.SetY(static_cast<int>(rect.height()));
return recti;
}
int vtkQtStringToImage::RenderString(vtkTextProperty* property, const vtkStdString& string, int dpi,
vtkImageData* data, int textDims[2])
{
if (!QApplication::instance())
{
vtkErrorMacro("You must initialize a QApplication before using this class.");
return 0;
}
// Get the required size, and initialize a new QImage to draw on.
vtkVector2i box = this->GetBounds(property, string, dpi);
if (box.GetX() == 0 || box.GetY() == 0)
{
return 0;
}
if (textDims)
{
textDims[0] = box.GetX();
textDims[1] = box.GetY();
}
QString text = QString::fromUtf8(string.c_str());
QFont fontSpec = this->Implementation->TextPropertyToFont(property, dpi);
QFontMetrics fontMetric(fontSpec);
// Get properties from text property
double rotation = -property->GetOrientation();
QColor textColor =
this->Implementation->TextPropertyToColor(property->GetColor(), property->GetOpacity());
int shOff[2];
property->GetShadowOffset(shOff);
double pixelPadding = 2;
double pixelPaddingX = pixelPadding + shOff[0];
double pixelPaddingY = pixelPadding - shOff[1];
QPainterPath path;
path.addText(0, 0, fontSpec, text);
QRectF bounds = path.boundingRect();
bounds.setWidth(bounds.width() + pixelPaddingX);
bounds.setHeight(bounds.height() + pixelPaddingY);
QTransform trans;
trans.rotate(rotation);
QRectF rotBounds = trans.mapRect(bounds);
QImage image(static_cast<int>(ceil(rotBounds.width() + pixelPaddingX)),
static_cast<int>(ceil(rotBounds.height() + pixelPaddingY)),
QImage::Format_ARGB32_Premultiplied);
image.fill(qRgba(0, 0, 0, 0));
QPainter p(&image);
p.setRenderHint(QPainter::TextAntialiasing, this->Antialias);
p.setRenderHint(QPainter::Antialiasing, this->Antialias);
p.translate(-rotBounds.left(), -rotBounds.top());
p.rotate(rotation);
if (property->GetShadow())
{
p.save();
p.translate(shOff[0], -shOff[1]);
double sc[3];
property->GetShadowColor(sc);
QColor shadowColor = this->Implementation->TextPropertyToColor(sc, property->GetOpacity());
p.fillPath(path, shadowColor);
p.restore();
}
p.fillPath(path, textColor);
this->QImageToImage->SetQImage(&image);
this->QImageToImage->Modified();
this->QImageToImage->Update();
data->DeepCopy(vtkImageData::SafeDownCast(this->QImageToImage->GetOutputDataObject(0)));
this->QImageToImage->SetQImage(nullptr);
return 1;
}
//------------------------------------------------------------------------------
void vtkQtStringToImage::DeepCopy(vtkQtStringToImage*) {}
//------------------------------------------------------------------------------
void vtkQtStringToImage::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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