[vtkusers] 2D Graph in VTK

[Thomas Obenaus]

Hi,

here is a short example written in Java. The function creates a vtkXYPlotActor which can directly added to the vtkRenderer. The input-data is a list of 
vtkStructuredGrid. 

public static vtkXYPlotActor makeXYPlot( ArrayList<vtkStructuredGrid> data,ArrayList<Color> colors,ArrayList<String> names,String xAxisName,String yAxisName,String plotTitle )
{
	// actor representing an xy-plot 
	vtkXYPlotActor xyplot = new vtkXYPlotActor( );	
		
	for( int i=0;i<data.size( );i++ )
	{
		Color color = colors.get( i );
		// adds the input-data for the plot (vtkDataSet e.g. vtkStructuredGrid)
		// each input will be represented by one line in the plot
		xyplot.AddInput( data.get( i ) );
		// set the color for the entry (color of the line)
		xyplot.GetLegendActor( ).SetEntryColor( i,( ( double )color.getRed( )/255.0 ),( ( double )color.getGreen( )/255.0 ),((double)color.getBlue()/255.0));
		//set the name or identifier for the entry which should be displayed 
		xyplot.GetLegendActor( ).SetEntryString( i,names.get( i ));
	}	
	
	// some global properties of the plot (position, title, etc...)
	xyplot.GetPositionCoordinate( ).SetValue( 0.07,0.4,0.0 );
	xyplot.GetPosition2Coordinate( ).SetValue( 0.9,0.33,0.0 );
	xyplot.SetXValuesToValue( );
	xyplot.SetNumberOfXLabels( 6 );
	xyplot.SetTitle( plotTitle );
	xyplot.SetXTitle( xAxisName );
	xyplot.LegendOn ();
	xyplot.SetYTitle( yAxisName );
	xyplot.GetProperty( ).SetColor( 0,0,0 );
	xyplot.GetProperty( ).SetLineWidth( 2 );
	
	// the plot-font
	vtkTextProperty tprop = xyplot.GetTitleTextProperty( );
	tprop.SetColor( xyplot.GetProperty( ).GetColor( ) );
	tprop.SetFontFamilyToArial( );
	tprop.BoldOff( );
	tprop.ItalicOn( );
	xyplot.SetAxisTitleTextProperty( tprop );
	xyplot.SetAxisLabelTextProperty( tprop );
	return xyplot;
}