[vtkusers] vtkChartLegend Position in Python

[Cory Quammen]

Well shoot, that member function must not be wrapped.

Instead, try this

legend = chart.GetLegend()
legend.SetHorizontalAlignment(vtk.vtkChartLegend.CUSTOM)
legend.SetVerticalAlignment(vtk.vtkChartLegend.CUSTOM)
legend.SetPoint(0, 20)

HTH,
Cory


On Thu, Oct 8, 2015 at 3:00 PM, Slaughter, Andrew E <
andrew.slaughter at inl.gov> wrote:

> Yes, that function does not exist.
>
> On Thu, Oct 8, 2015 at 12:45 PM, Cory Quammen <cory.quammen at kitware.com>
> wrote:
>
>> Hi Andrew,
>>
>> Have you tried vtkChartXY::SetLegendPosition(const vtkRectf & rect), e.g.
>>
>> rect = vtkRectf(0, 20, ?, ?)
>> char.SetLegendPosition(rect)
>>
>> HTH,
>> Cory
>>
>> On Thu, Oct 8, 2015 at 2:33 PM, Slaughter, Andrew E <
>> andrew.slaughter at inl.gov> wrote:
>>
>>> I am writing a script to build some line charts in VTK, but I am having
>>> difficulty repositioning a vtkChartLegend object.
>>>
>>> The python script below will create a plot. I would like to reposition
>>> the legend to the upper left-hand side of the chart so as to not interfere
>>> with the line plot. However, I am not able to make the legend move. I would
>>> appreciate any help to get the legend to re-position?
>>>
>>> I am running OSX (Yosemite) with Python 2.7.6 and VTK 6.3.
>>>
>>>
>>> #!/usr/bin/env python
>>> import vtk
>>>
>>> # Num. points
>>> n = 10
>>>
>>> # Create some data
>>> x = vtk.vtkFloatArray()
>>> y = vtk.vtkFloatArray()
>>> x.SetNumberOfTuples(n)
>>> x.SetName('x')
>>> y.SetNumberOfTuples(n)
>>> y.SetName('y')
>>>
>>> for i in range(10):
>>>     x.SetValue(i, float(i))
>>>     y.SetValue(i, float(2*i))
>>>
>>> # Create the table and line
>>> table = vtk.vtkTable()
>>> table.AddColumn(x)
>>> table.AddColumn(y)
>>> line = vtk.vtkPlotLine()
>>> line.SetInputData(table, 0, 1)
>>>
>>> # Create chart
>>> chart = vtk.vtkChartXY()
>>> chart.AddPlot(line)
>>>
>>> # Create view
>>> view = vtk.vtkContextActor()
>>> view.GetScene().AddItem(chart)
>>>
>>> # Renderer
>>> renderer = vtk.vtkRenderer()
>>> renderer.SetBackground(1,1,1)
>>> renderer.AddViewProp(view)
>>>
>>> # Legend
>>> chart.SetShowLegend(True)
>>> legend = chart.GetLegend()
>>> legend.SetPoint(0, 20) # This doesn't seem to do anything
>>>
>>> # Window
>>> window = vtk.vtkRenderWindow()
>>> window.AddRenderer(renderer)
>>>
>>> # Interactor
>>> interactor = vtk.vtkRenderWindowInteractor()
>>> interactor.SetRenderWindow(window)
>>>
>>> # Render
>>> window.Render()
>>> renderer.Render()
>>> interactor.Start()
>>>
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>>
>>
>> --
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.
>>
>
>


-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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