org.faceless.graph
Class LineGraph

java.lang.Object
  org.faceless.graph.Graph
      org.faceless.graph.AxesGraph
          org.faceless.graph.AbstractLineGraph
              org.faceless.graph.LineGraph

public class LineGraph
extends AbstractLineGraph

A subclass of AbstractLineGraph that plots one or more separate curves - a typical Line Graph.

This class changes the default for optionXAxisAtZero and optionYAxisAtZero to true.

Here is a simple example that graphs two curves - the first, a set of datapoints defined by a DataCurve, the second a Spline curve that's fitted to the DataCurve.

    import org.faceless.graph.output.ImageOutput;
    import org.faceless.graph.math.*;
    import java.awt.Color;

    // Create a simple datacurve with 4 points.
    //
    DataCurve data = new DataCurve();
    data.set(1,10);
    data.set(2,15);
    data.set(3,8);
    data.set(5,11);
    
    // Plot the data in red on a linegraph, with a diamond
    // at each point.
    //
    LineGraph g = new LineGraph();
    g.setCurve("My Data", data, Color.red);
    g.setCurveMarker("My Data", LineGraph.MARKER_DIAMOND);

    // Add a "smoothed" version of this DataCurve in green.
    //
    Curve smooth = new Spline(Spline.CATMULLROM, data);
    g.setCurve("Smoothed Data", smooth, Color.green);

    // Add a title to the graph
    //
    g.optionTitle("My First Line Graph");

    // Render to an image that's 400x400
    //
    ImageOutput out = new ImageOutput(400,400);
    out.render(g);
 

KEY_SHOW_MARKERS

public static final int KEY_SHOW_MARKERS

If markers are to be displayed on the key, add this value to the parameter passed to Graph.optionDisplayKey(int). For example, linegraph.optionDisplayKey(Graph.KEY_BOXED_BOTTOM + LineGraph.KEY_SHOW_MARKERS)

Since:

1.0.7

See Also:

Constant Field Values

MARKER_NONE

public static final int MARKER_NONE

No marker at all.

See Also:

Constant Field Values

MARKER_CIRCLE

public static final int MARKER_CIRCLE

A marker in the shape of a circle

Since:

1.0.10

See Also:

Constant Field Values

MARKER_SQUARE

public static final int MARKER_SQUARE

A marker in the shape of a square

See Also:

Constant Field Values

MARKER_OCTAGON

public static final int MARKER_OCTAGON

A marker in the shape of an octagon

See Also:

Constant Field Values

MARKER_DIAMOND

public static final int MARKER_DIAMOND

A marker in the shape of a diamond

See Also:

Constant Field Values

MARKER_LINE

public static final int MARKER_LINE

A marker that looks like a join in the line. This is the default.

See Also:

Constant Field Values

MARKER_UPTRIANGLE

public static final int MARKER_UPTRIANGLE

A marker in the shape of a triangle pointing up

Since:

1.0.7

See Also:

Constant Field Values

MARKER_DOWNTRIANGLE

public static final int MARKER_DOWNTRIANGLE

A marker in the shape of a triangle pointing down

Since:

1.0.7

See Also:

Constant Field Values

MARKER_BIG

public static final int MARKER_BIG

Add this value to the marker type to double the size of the marker. For example, setCurveMarker("mycurve", MARKER_SQUARE+MARKER_BIG)

Since:

1.0.7

See Also:

Constant Field Values

MARKER_SMALL

public static final int MARKER_SMALL

Add this value to the marker type to reduce the size of the marker. For example, setCurveMarker("mycurve", MARKER_SQUARE+MARKER_SMALL)

Since:

1.0.10

See Also:

Constant Field Values

MARKER_NOBORDER

public static final int MARKER_NOBORDER

Add this value to the marker type to remove the border from around the marker. For example, setCurveMarker("mycurve", MARKER_CIRCLE+MARKER_NOBORDER)

Since:

1.0.10

See Also:

Constant Field Values

MARKERS_ONLY

public static final int MARKERS_ONLY

A special type of marker indicator that should be OR'ed with the marker type to indicate that only markers should be drawn - i.e. no lines, just markers. This needs to be used with SQUARES, OCTAGONS, DIAMONDS, CIRCLES and TRIANGLES only - the line will simply disappear if it's used with any other type. For example, to draw a small circle at each point but no line inbetween, do: setCurveMarker("mycurve", MARKER_CIRCLE+MARKER_SMALL+MARKERS_ONLY)

See Also:

Constant Field Values

LineGraph

public LineGraph()

setCurveMarker

public void setCurveMarker(String name,
                           int marker)

Set a marker to show significant points on the curve Not all points have significant points, but for DataCurve curves there is a significant point at each data item. Whether a marker is plotted depends on the value passed to this function.

Parameters:

name - The name of the curve

marker - The type if marker. Can be MARKER_NONE, MARKER_LINE (the default), MARKER_SQUARE, MARKER_CIRCLE MARKER_DIAMOND, MARKER_OCTAGON, MARKER_UPTRIANGLE or MARKER_DOWNTRIANGLE

optionLineThickness

public void optionLineThickness(double val)

Set the "thickness" of the lines when drawing two-dimensional graphs. This has no effect if the graph is rotated in the X or Y direction, and may not be supported by all subclasses of Output. It's mainly intended for plotting graphs to high-resolution output devices like PDF or PostScript.