plotSetLegend¶

Purpose¶

Adds a legend to a graph.

Format¶

plotSetLegend(&myPlot, label[, location[, orientation]])¶

plotSetLegend(&myPlot, turn_off)

Parameters:

&myPlot (struct pointer) – A plotControl structure pointer.
label (string array) – names of the line labels.
location (string or 2x1 vector) –
Optional argument, the location to place the legend.

If a string, the location string may contain up to three tokens, or words.
1. Vertical location: "top" (default), "vcenter" or "bottom". (Note: for backwards compatibilty "middle" may still be used for "vcenter". However, new programs should use "vcenter").
2. Horizontal location: "left", "hcenter" or "right" (default). (Note: for backwards compatibility "center" may still be used for "hcenter". However, new programs should use "hcenter").
3. Inside/Outside location: "inside" (default), "bottom" or "outside".
If a vector, location represents the coordinates on the graph where the top, left corner of the legend will be placed.
orientation (scalar) – Optional argument, 0 for a horizontal legend or 1 for a vertical legend.
turn_off (string) – "off" will disable the legend.

Technical Notes¶

The location parameter is a string with up to three tokens or words that are separated by a space. For example,
```
location = "top right";
location = "right top";
location = "inside top right";
```
Use plotSetLegendFont() to control the legend font family, size and color.
Use plotSetLegendBkd() to control the legend background color and opacity.
Use plotSetLegendBorder() to control the legend border color and thickness.
See plotSetTextInterpreter(), for instructions on using LaTeX, or HTML in the legend labels.

Examples¶

// Declare plotControl structure
struct plotControl myPlot;

// Initialize plotControl structure
myPlot = plotGetDefaults("scatter");

// Set labels, location, and orientation of legend
label = "sample A"$|"sample B";
location = "top right";
orientation = 0;
plotSetLegend(&myPlot, label, location, orientation);

// Create data
x = rndn(30, 2);
y = rndn(30, 2);

// Plot the data with the legend settings
plotScatter(myplot, x, y);

Remarks¶

Note

This function sets an attribute in a plotControl structure. It does not affect an existing graph, or a new graph drawn using the default settings that are accessible from the Tools > Preferences > Graphics menu.