[vtkusers] magnify vtkChartXY image

[Gerrick Bivins]

Just an FYI,
I've tried to use that in the past and it didn't capture the render properly:
http://vtk.1045678.n5.nabble.com/vtkRenderLargeImage-and-multiple-renders-td1240248.html

I remember looking into it but I don't think I figured out what was wrong, something with multiple renderers was the issue for me I think.
It may be fixed now because that was a couple of years and version of vtk ago
Gerrick


-----Original Message-----
From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf Of Bill Lorensen
Sent: Monday, December 17, 2012 11:19 AM
To: Randy Heiland
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] magnify vtkChartXY image

Randy,

Have you tried vtkRenderLargeImage:
http://vtk.org/Wiki/VTK/Examples/Cxx/Visualization/RenderLargeImage

I have not tried it with a chart, but it's worth a shot.

Regards,

Bill

On Fri, Dec 14, 2012 at 4:16 PM, Randy Heiland <heiland at indiana.edu> wrote:
> Is there some way to magnify (or set the resolution of) a rendered chart, in order to generate a higher-res image from a Writer?  e.g. I attempted the following simple Python script, which did indeed generate a magnified (x 2) .png image, but it was not what I expected.
>
> thanks, Randy
>
> from vtk import *
>
> table = vtkTable()
> arrX = vtkFloatArray()
> arrX.SetName("X")
> table.AddColumn(arrX)
> arrY = vtkFloatArray()
> arrY.SetName("Y")
> table.AddColumn(arrY)
>
> table.SetNumberOfRows(2)
> table.SetValue(0, 0, 0.0)
> table.SetValue(1, 0, 1.0)
> table.SetValue(0, 1, 0.0)
> table.SetValue(1, 1, 1.0)
>
> view = vtkContextView()
>
> chart = vtkChartXY()
> view.GetScene().AddItem(chart)
> line = chart.AddPlot(vtkChart.LINE)
> line.SetInput(table, 0, 1)
>
> view.GetInteractor().Initialize()
> view.GetRenderWindow().SetSize(200,200)
>
> imgFilter = vtkWindowToImageFilter()
> imgFilter.SetInput(view.GetRenderWindow())
> imgFilter.SetMagnification(2)
>
> writer=vtkPNGWriter()
> writer.SetFileName("chart.png")
> writer.SetInputConnection(imgFilter.GetOutputPort())
> writer.Write()
>
> #view.GetInteractor().Start()
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