[vtkusers] magnify vtkChartXY image

[Bill Lorensen]

I just tried it also. For some reason it just replicates the chart.



On Mon, Dec 17, 2012 at 1:42 PM, Gerrick Bivins
<Gerrick.Bivins at halliburton.com> wrote:
> 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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>
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