VRL-Studio Component for plotting tangent lines

TangentLine.groovy

import edu.gcsc.vrl.jfreechart.TrajectoryPlotter;
import org.jfree.chart.JFreeChart;

@ComponentInfo(name="TangentLine", category="Custom")
public class TangentLine implements java.io.Serializable {
  private static final long serialVersionUID=1L;

  // plotter object
  private transient TrajectoryPlotter plotter;
  
  public JFreeChart tangentLine(
    Trajectory t,
    @ParamInfo(name="pos", 
    /* we request slider style for this integer */           
    style="slider",
    /* invoke on change invokes the method whenever the slider position changes */
    options="min=0;max=100;invokeOnChange=true" ) int pos
  ) {

     // initialize plotter object
     if(plotter==null) {
       plotter = new TrajectoryPlotter();
     }

     // *** compute the tangent ***
     Trajectory tangentLine = new Trajectory("Tangent Line");

     // TODO add your code here
    

     // plot both trajectories
     return plotter.lineChart(t,tangentLine);
  }
}