[vtkusers] How to get curved lines in vtkChartXY

[madz]

Hi,
I found a way to do it,

	vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();

	for (int i = 0; i < size; i++){
		points->InsertNextPoint(Xvals[i],Yvals[i],0);//inset original point values
	}

	vtkSmartPointer<vtkParametricSpline> spline = 
		vtkSmartPointer<vtkParametricSpline>::New();
	spline->SetPoints(points);
	spline->ParameterizeByLengthOff();

	vtkSmartPointer<vtkParametricFunctionSource> functionSource = 
		vtkSmartPointer<vtkParametricFunctionSource>::New();
	functionSource->SetParametricFunction(spline);
	functionSource->SetScalarModeToNone();
	functionSource->GenerateTextureCoordinatesOff();
	functionSource->SetUResolution( 499 );
	functionSource->Update();



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