Tutorial Step5
Repository source: Tutorial_Step5
Description¶
This example introduces the concepts of interaction into the Python environment. A different interaction style (than the default) is defined.
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Question
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Code¶
Tutorial_Step5.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.
=========================================================================*/
// First include the required header files for the VTK classes we are using.
#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkConeSource.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
//
// Next we create an instance of vtkConeSource and set some of its
// properties. The instance of vtkConeSource "cone" is part of a
// visualization pipeline (it is a source process object); it produces data
// (output type is vtkPolyData) which other filters may process.
//
vtkNew<vtkConeSource> cone;
cone->SetHeight(3.0);
cone->SetRadius(1.0);
cone->SetResolution(10);
//
// In this example we terminate the pipeline with a mapper process object.
// (Intermediate filters such as vtkShrinkPolyData could be inserted in
// between the source and the mapper.) We create an instance of
// vtkPolyDataMapper to map the polygonal data into graphics primitives. We
// connect the output of the cone source to the input of this mapper.
//
vtkNew<vtkPolyDataMapper> coneMapper;
coneMapper->SetInputConnection(cone->GetOutputPort());
//
// Create an actor to represent the cone. The actor orchestrates rendering
// of the mapper's graphics primitives. An actor also refers to properties
// via a vtkProperty instance, and includes an internal transformation
// matrix. We set this actor's mapper to be coneMapper which we created
// above.
//
vtkNew<vtkActor> coneActor;
coneActor->SetMapper(coneMapper);
coneActor->GetProperty()->SetColor(colors->GetColor3d("Bisque").GetData());
//
// Create the Renderer and assign actors to it. A renderer is like a
// viewport. It is part or all of a window on the screen and it is
// responsible for drawing the actors it has. We also set the background
// color here.
//
vtkNew<vtkRenderer> ren1;
ren1->AddActor(coneActor);
ren1->SetBackground(colors->GetColor3d("MidnightBlue").GetData());
//
// Finally we create the render window which will show up on the screen.
// We put our renderer into the render window using AddRenderer. We also
// set the size to be 300 pixels by 300.
//
vtkNew<vtkRenderWindow> renWin;
renWin->AddRenderer(ren1);
renWin->SetSize(300, 300);
renWin->SetWindowName("Tutorial_Step5");
//
// The vtkRenderWindowInteractor class watches for events (e.g., keypress,
// mouse) in the vtkRenderWindow. These events are translated into
// event invocations that VTK understands (see VTK/Common/vtkCommand.h
// for all events that VTK processes). Then observers of these VTK
// events can process them as appropriate.
vtkNew<vtkRenderWindowInteractor> iren;
iren->SetRenderWindow(renWin);
//
// By default the vtkRenderWindowInteractor instantiates an instance
// of vtkInteractorStyle. vtkInteractorStyle translates a set of events
// it observes into operations on the camera, actors, and/or properties
// in the vtkRenderWindow associated with the vtkRenderWinodwInteractor.
// Here we specify a particular interactor style.
vtkNew<vtkInteractorStyleTrackballCamera> style;
iren->SetInteractorStyle(style);
//
// Unlike the previous scripts where we performed some operations and then
// exited, here we leave an event loop running. The user can use the mouse
// and keyboard to perform the operations on the scene according to the
// current interaction style. When the user presses the "e" key, by default
// an ExitEvent is invoked by the vtkRenderWindowInteractor which is caught
// and drops out of the event loop (triggered by the Start() method that
// follows.
//
iren->Initialize();
iren->Start();
//
// Final note: recall that observers can watch for particular events and
// take appropriate action. Pressing "u" in the render window causes the
// vtkRenderWindowInteractor to invoke a UserEvent. This can be caught to
// popup a GUI, etc. See the Tcl Cone5.tcl example for an idea of how this
// works.
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(Tutorial_Step5)
find_package(VTK COMPONENTS
CommonColor
CommonCore
FiltersSources
InteractionStyle
RenderingContextOpenGL2
RenderingCore
RenderingFreeType
RenderingGL2PSOpenGL2
RenderingOpenGL2
)
if (NOT VTK_FOUND)
message(FATAL_ERROR "Tutorial_Step5: Unable to find the VTK build folder.")
endif()
# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(Tutorial_Step5 MACOSX_BUNDLE Tutorial_Step5.cxx )
target_link_libraries(Tutorial_Step5 PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS Tutorial_Step5
MODULES ${VTK_LIBRARIES}
)
Download and Build Tutorial_Step5¶
Click here to download Tutorial_Step5 and its CMakeLists.txt file. Once the tarball Tutorial_Step5.tar has been downloaded and extracted,
cd Tutorial_Step5/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./Tutorial_Step5
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.