VTK/Charts
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Goals
- Render 2D charts using OpenGL/VTK
- Scalable to large data sets
- Simple, flexible API
- Enable server side rendering of charts with VTK compositing
- Proper handling of IEEE Not-A-Number (NaN) values in plots of both experimental and simulation data.
Open Questions
- Alternate backend to produce publication quality output?
- Possibility to extend the API to 3D charts in the future?
- Maybe real-time charting? (just-in-time visualization of data sets)
Unlimited Options
Supported Parameter Types
- Basic types (double, int, string)
- vtkVariant
- Data object
- Pipeline output port
- vtkArray
- vtkAbstractArray
- Data object + array name
- Data object + array name + component index
- Function pointer
- Functor (i.e. struct type with operator())
- Lambda function (boost::lambda)
- Strategies (i.e. subclass vtkDoubleParameter which has virtual method
double Get(vtkMark* m, int i)) - Override virtual methods in mark (i.e. subclass vtkDotMark which has virtual method
double GetSize(int i)) - Inherit from parent mark
Parameter Storage
- Named member variables
- Named member variables with import/export to name/value map
- Generic name/value map
class vtkMark { public:
ParamType GetParameter(string key)
{ return this->Parameters[key].Valid ? this->Parameters[key] : this->Parent->GetParameter(key); }
void SetParameter(string key, ParamType p)
{ this->Parameters[key] = p; }
private:
map<string, ParamType> Parameters;
}
- Generic name/value map with setter/getter syntactic sugar for discoverability
class vtkDotMark {
public:
ParamType GetSize() { return this->GetParameter("size"); }
void SetSize(ParamType p) { this->SetParameter("size", p); }
}
Other Features
- Declarative API
Further Details on API
Please see VTK/Charts/API for a discussion about the API. There is also more detail about the VTK/Charts/2DAPI and the VTK/Charts/ChartAPI along with proposed class relationships.
Chart Types
- XY plot
- Scatter
- Bar chart
- Histogram
- Stack chart
- Pie chart
- Parallel axes
- Tree map
- Bubble chart
Existing Applications/Libraries
Below is a summary of different libraries or applications that produce 2D charts and plots. Those listed either provide both screen and publication quality rendering, or just screen rendering.
Optimized for Screen Rendering
- prefuse
- tableau
- Many Eyes
- Google Chart
- Qwt
- QwtPlot3D
- QPlotter
- ggobi
- ZedGraph
- TeeChart
- Iocomp
- Scientific charting control
- ChartDirector
- Dundas
- Visifire
- core-plot
- Protoviz
