# This example demonstrates the use of 2D text.

#
# First we include the VTK Tcl packages which will make available
# all of the vtk commands to Tcl
#
package require vtk
package require vtkinteraction

# Create a sphere source, mapper, and actor
vtkSphereSource sphere

vtkPolyDataMapper sphereMapper
    sphereMapper SetInputConnection [sphere GetOutputPort]
    sphereMapper GlobalImmediateModeRenderingOn
vtkLODActor sphereActor
    sphereActor SetMapper sphereMapper

# Create a scaled text actor. 
# Set the text, font, justification, and properties (bold, italics, etc.).
vtkTextActor textActor
    textActor ScaledTextOn
    textActor SetDisplayPosition 90 50 
    textActor SetInput "This is a sphere"

    # Set coordinates to match the old vtkScaledTextActor default value
    [textActor GetPosition2Coordinate] SetCoordinateSystemToNormalizedViewport
    [textActor GetPosition2Coordinate] SetValue 0.6 0.1

set tprop [textActor GetTextProperty]
    $tprop SetFontSize 18
    $tprop SetFontFamilyToArial
    $tprop SetJustificationToCentered
    $tprop BoldOn
    $tprop ItalicOn
    $tprop ShadowOn
    $tprop SetColor 0 0 1

# Create the Renderer, RenderWindow, RenderWindowInteractor
#
vtkRenderer ren1
vtkRenderWindow renWin
    renWin AddRenderer ren1
vtkRenderWindowInteractor iren
    iren SetRenderWindow renWin

# Add the actors to the renderer; set the background and size; zoom in;
# and render.
#
ren1 AddActor2D textActor
ren1 AddActor sphereActor

ren1 SetBackground 1 1 1
renWin SetSize 250 125
ren1 ResetCamera
[ren1 GetActiveCamera] Zoom 1.5
renWin Render

# Set the user method (bound to key 'u')
iren AddObserver UserEvent {wm deiconify .vtkInteract}

# Withdraw the tk window
wm withdraw .