[vtkusers] vtkChartXY to imitate vtkLegendScaleActor behaviour.

[madz]

I need a to display a set of drag-able points in a chart. To achieve this I
used vtkSplineWidget. But the problem occurs when I have to display the axis
legends and grid lines in the chart.
I tried using the vtkSplineWidget in vtkChartXY but the points does not
occur where the co-ordinates in the chart displays them to be.

Code eg -


#include <vtkSmartPointer.h>
#include <vtkChartXY.h>
#include <vtkContextScene.h>
#include <vtkContextView.h>
#include <vtkFloatArray.h>
#include <vtkPlotPoints.h>
#include <vtkTable.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkProperty.h>
#include <vtkSplineWidget.h>


void main(){

	double valueArr[4] = {12.4,11.2,10,15.5};

	int x = 4;
	// Set up a 2D scene, add an XY chart to it
	vtkSmartPointer<vtkContextView> view =
vtkSmartPointer<vtkContextView>::New();
	view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
	view->GetRenderWindow()->SetSize(500, 400);

	vtkSmartPointer<vtkChartXY> chart =
		vtkSmartPointer<vtkChartXY>::New();
	view->GetScene()->AddItem(chart);
	chart->SetShowLegend(true);

	// Create a table with some points in it...
	vtkSmartPointer<vtkTable> table =
		vtkSmartPointer<vtkTable>::New();

	vtkSmartPointer<vtkFloatArray> arrX =
		vtkSmartPointer<vtkFloatArray>::New();
	arrX->SetName("X Axis");
	table->AddColumn(arrX);

	vtkSmartPointer<vtkFloatArray> arrC =
vtkSmartPointer<vtkFloatArray>::New();
	arrC->SetName("Y Axis");
	table->AddColumn(arrC);

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

	// Test charting with a few more points...
	table->SetNumberOfRows(x);
	for (int i = 0; i < x; i++)
	{
		table->SetValue(i, 0, i+1 );
		table->SetValue(i, 1, valueArr[i]);
		po->InsertNextPoint(i,valueArr[i],0);

	}

	// Add multiple scatter plots, setting the colors etc
	vtkPlot *points = chart->AddPlot(vtkChart::POINTS);
	vtkPlot *line = chart->AddPlot(vtkChart::LINE);
#if VTK_MAJOR_VERSION <= 5
	points->SetInput(table, 0, 1);
	line->SetInput(table, 0, 1);
#else
	points->SetInputData(table, 0, 1);
	line->SetInputData(table, 0, 1);
#endif
	points->SetColor(0, 0, 255, 255);
	points->SetWidth(1.0);
	line->SetColor(0, 255, 0, 255);
	line->SetWidth(1.0);
	vtkPlotPoints::SafeDownCast(points)->SetMarkerStyle(vtkPlotPoints::CIRCLE);
	points = chart->AddPlot(vtkChart::POINTS);
	line = chart->AddPlot(vtkChart::LINE);

	vtkSmartPointer<vtkSplineWidget> splineWidget = 
		vtkSmartPointer<vtkSplineWidget>::New();
	splineWidget->SetInteractor(view->GetInteractor());
	splineWidget->InitializeHandles(po);
	
	splineWidget->SetHandleSize( 0.01 );
	splineWidget->GetHandleProperty()->SetColor(0,1,0);
	double bnds[6];
	po->GetBounds( bnds );
	splineWidget->PlaceWidget( bnds[0], bnds[1], bnds[2], bnds[3], bnds[4],
bnds[5] );
	splineWidget->SetNumberOfHandles(po->GetNumberOfPoints()); //not needed
	splineWidget->SetCurrentRenderer( view->GetRenderer() );
	splineWidget->SetDefaultRenderer( view->GetRenderer());

	vtkProperty* prop = vtkProperty::New();
	prop->SetColor(0,0,0 );

	splineWidget->SetLineProperty( prop );
	splineWidget->On();
	//Finally render the scene
	view->GetInteractor()->Initialize();
	view->GetRenderWindow()->SetWindowName("XY Simple Graph");
	view->GetInteractor()->Start();

}

Then I tried the vtkLegendScaleActor, but this does not display any grid
lines.

Code eg - 


#include <vtkSmartPointer.h>
#include <vtkLegendScaleActor.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkProperty.h>
#include <vtkSplineWidget.h>


void main(){

	vtkSmartPointer<vtkRenderer> renderer = 
		vtkSmartPointer<vtkRenderer>::New();
	vtkSmartPointer<vtkRenderWindow> renderWindow = 
		vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->AddRenderer(renderer);

	// An interactor
	vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	renderWindowInteractor->SetRenderWindow(renderWindow);
	double valueArr[4] = {12.4,11.2,10,15.5};

	int x = 4;

	vtkSmartPointer<vtkPoints> po =  vtkSmartPointer<vtkPoints>::New();
	for (int i = 0; i < x; i++)
	{
		po->InsertNextPoint(i,valueArr[i],0);

	}

	vtkSmartPointer<vtkSplineWidget> splineWidget = 
		vtkSmartPointer<vtkSplineWidget>::New();
	splineWidget->SetInteractor(renderWindowInteractor);
	splineWidget->InitializeHandles(po);

	splineWidget->SetHandleSize( 0.01 );
	splineWidget->GetHandleProperty()->SetColor(0,1,0);
	double bnds[6];
	po->GetBounds( bnds );
	splineWidget->PlaceWidget( bnds[0], bnds[1], bnds[2], bnds[3], bnds[4],
bnds[5] );
	splineWidget->SetNumberOfHandles(po->GetNumberOfPoints()); //not needed
	splineWidget->SetCurrentRenderer( renderer );
	splineWidget->SetDefaultRenderer( renderer);

	vtkProperty* prop = vtkProperty::New();
	prop->SetColor(0,0,0 );

	vtkSmartPointer<vtkLegendScaleActor> legendScaleActor = 
		vtkSmartPointer<vtkLegendScaleActor>::New();
	legendScaleActor->SetLabelModeToXYCoordinates();
	legendScaleActor->GetRightAxis()->GetProperty()->SetColor(0,0,0);
	legendScaleActor->GetRightAxis()->AdjustLabelsOn();
	legendScaleActor->GetRightAxis()->GetLabelTextProperty()->SetColor(0,0,0);
	legendScaleActor->GetLeftAxis()->GetProperty()->SetColor(0,0,0);
	legendScaleActor->GetLeftAxis()->GetLabelTextProperty()->SetColor(0,0,0);
	legendScaleActor->GetLeftAxis()->AdjustLabelsOn();
	legendScaleActor->GetTopAxis()->GetProperty()->SetColor(0,0,0);
	legendScaleActor->GetTopAxis()->GetLabelTextProperty()->SetColor(0,0,0);
	legendScaleActor->GetTopAxis()->AdjustLabelsOn();
	legendScaleActor->GetBottomAxis()->GetProperty()->SetColor(0,0,0);
	legendScaleActor->GetBottomAxis()->GetLabelTextProperty()->SetColor(0,0,0);
	legendScaleActor->GetBottomAxis()->AdjustLabelsOn();

	legendScaleActor->LegendVisibilityOff();
	renderer->AddActor(legendScaleActor);
	renderer->ResetCamera();

	renderWindow->Render();
	renderer->SetBackground(1,1,1);
	renderWindowInteractor->Start();

}

 Is there a way to set the grid line and axis legend positions to imitate
the vtkLegendScaleActor or to set the vtkSplineWidget point co-ordinates
according to the vtkChartXY?

Any help would be appreciated, Thank you.



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