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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLTextActor3D.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 "vtkOpenGLTextActor3D.h"
#include "vtkCamera.h"
#include "vtkMatrix4x4.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLGL2PSHelper.h"
#include "vtkPath.h"
#include "vtkRenderer.h"
#include "vtkTextProperty.h"
#include "vtkTextRenderer.h"
#include <sstream>
#include <string>
vtkStandardNewMacro(vtkOpenGLTextActor3D)
//------------------------------------------------------------------------------
void vtkOpenGLTextActor3D::PrintSelf(std::ostream &os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
int vtkOpenGLTextActor3D::RenderTranslucentPolygonalGeometry(vtkViewport *vp)
{
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
if (gl2ps)
{
switch (gl2ps->GetActiveState())
{
case vtkOpenGLGL2PSHelper::Capture:
return this->RenderGL2PS(vp, gl2ps);
case vtkOpenGLGL2PSHelper::Background:
return 0; // No render.
case vtkOpenGLGL2PSHelper::Inactive:
break; // normal render.
}
}
return this->Superclass::RenderTranslucentPolygonalGeometry(vp);
}
//------------------------------------------------------------------------------
vtkOpenGLTextActor3D::vtkOpenGLTextActor3D()
{
}
//------------------------------------------------------------------------------
vtkOpenGLTextActor3D::~vtkOpenGLTextActor3D()
{
}
//------------------------------------------------------------------------------
int vtkOpenGLTextActor3D::RenderGL2PS(vtkViewport *vp,
vtkOpenGLGL2PSHelper *gl2ps)
{
vtkRenderer *ren = vtkRenderer::SafeDownCast(vp);
if (!ren)
{
vtkWarningMacro("Viewport is not a renderer.");
return 0;
}
// Get path
std::string input = this->Input && this->Input[0] ? this->Input : "";
vtkNew<vtkPath> textPath;
vtkTextRenderer *tren = vtkTextRenderer::GetInstance();
if (!tren)
{
vtkWarningMacro(<<"Cannot generate path data from 3D text string '"
<< input << "': Text renderer unavailable.");
return 0;
}
if (!tren->StringToPath(this->TextProperty, input, textPath.GetPointer(),
vtkTextActor3D::GetRenderedDPI()))
{
vtkWarningMacro(<<"Failed to generate path data from 3D text string '"
<< input << "': StringToPath failed.");
return 0;
}
// Get actor info
vtkMatrix4x4 *actorMatrix = this->GetMatrix();
double actorBounds[6];
this->GetBounds(actorBounds);
double textPos[3] = {(actorBounds[1] + actorBounds[0]) * 0.5,
(actorBounds[3] + actorBounds[2]) * 0.5,
(actorBounds[5] + actorBounds[4]) * 0.5};
double *fgColord = this->TextProperty->GetColor();
unsigned char fgColor[4] = {
static_cast<unsigned char>(fgColord[0] * 255),
static_cast<unsigned char>(fgColord[1] * 255),
static_cast<unsigned char>(fgColord[2] * 255),
static_cast<unsigned char>(this->TextProperty->GetOpacity() * 255)};
// Draw the background quad as a path:
if (this->TextProperty->GetBackgroundOpacity() > 0.f)
{
double *bgColord = this->TextProperty->GetBackgroundColor();
unsigned char bgColor[4] = {
static_cast<unsigned char>(bgColord[0] * 255),
static_cast<unsigned char>(bgColord[1] * 255),
static_cast<unsigned char>(bgColord[2] * 255),
static_cast<unsigned char>(this->TextProperty->GetBackgroundOpacity() *
255)};
// Get the camera so we can calculate an offset to place the background
// behind the text.
vtkCamera *cam = ren->GetActiveCamera();
vtkMatrix4x4 *mat = cam->GetCompositeProjectionTransformMatrix(
ren->GetTiledAspectRatio(), 0., 1.);
double forward[3] = {mat->GetElement(2, 0),
mat->GetElement(2, 1),
mat->GetElement(2, 2)};
vtkMath::Normalize(forward);
double bgPos[3] = {textPos[0] - (forward[0] * 0.0001),
textPos[1] - (forward[1] * 0.0001),
textPos[2] - (forward[2] * 0.0001)};
vtkTextRenderer::Metrics metrics;
if (tren->GetMetrics(this->TextProperty, input, metrics,
vtkTextActor3D::GetRenderedDPI()))
{
vtkNew<vtkPath> bgPath;
bgPath->InsertNextPoint(static_cast<double>(metrics.TopLeft.GetX()),
static_cast<double>(metrics.TopLeft.GetY()),
0., vtkPath::MOVE_TO);
bgPath->InsertNextPoint(static_cast<double>(metrics.TopRight.GetX()),
static_cast<double>(metrics.TopRight.GetY()),
0., vtkPath::LINE_TO);
bgPath->InsertNextPoint(static_cast<double>(metrics.BottomRight.GetX()),
static_cast<double>(metrics.BottomRight.GetY()),
0., vtkPath::LINE_TO);
bgPath->InsertNextPoint(static_cast<double>(metrics.BottomLeft.GetX()),
static_cast<double>(metrics.BottomLeft.GetY()),
0., vtkPath::LINE_TO);
bgPath->InsertNextPoint(static_cast<double>(metrics.TopLeft.GetX()),
static_cast<double>(metrics.TopLeft.GetY()),
0., vtkPath::LINE_TO);
std::ostringstream bgLabel;
bgLabel << "vtkOpenGLTextActor3D::RenderGL2PS background for string: '"
<< input << "'.";
gl2ps->Draw3DPath(bgPath.GetPointer(), actorMatrix, bgPos, bgColor, ren,
bgLabel.str().c_str());
}
}
// Draw the text path:
std::ostringstream label;
label << "vtkOpenGLTextActor3D::RenderGL2PS path for string: '"
<< input << "'.";
gl2ps->Draw3DPath(textPath.GetPointer(), actorMatrix, textPos, fgColor, ren,
label.str().c_str());
return 1;
}
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