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Short explanatory text for legend

Value Summary

OptionalText string


LegendText sets the text for the legend entry of an object.

    Note:   LegendText is a technical internal attribute. You will most likely want to use the library interface attribute Legend in order to set legend entries.

To have a legend entry, the object must have Legend set to TRUE and LegendVisible must be TRUE for the enclosing scene. Cf. Example 1.

If LegendText is unset, but Legend and LegendVisible are TRUE, the legend entry is taken from the attribute Name. If that is unset, too, the name of the object type is displayed. Cf. Example 2.


Example 1

We create a few objects with values for LegendText set:

f := plot::Function2d(sin(x), x = 0..PI,
                      LegendText = "f(x)", Color = RGB::Red):
g := plot::Function2d(cos(x), x = 0..PI,
                      LegendText = "f'(x)", Color = RGB::Blue):
p := plot::Point2d([2, sin(2)], PointSize = 3*unit::mm,
                   LegendText = "(2; f(2))", Color = RGB::Black):

Switching on the legend, we plot these objects:

plot(f, g, p, LegendVisible = TRUE)

As we can see, only the function objects show up in the legend. If p is supposed to be shown there, too, we must explicitly set LegendEntry to TRUE:

p::LegendEntry := TRUE:
plot(f, g, p, LegendVisible = TRUE)

Example 2

If an object has a legend entry, but LegendText is not set, the first fall-back is the Name attribute of the object:

plot(plot::Function3d(sin(x^2 + y^2), x = -2..2, y = -2..2,
                      Color = RGB::Green, FillColorType = Flat,
                      LegendText = "LegendText: sin",
                      Name = "Name: sin"),
     plot::Function3d(cos(x + y), x = -2..2, y = -2..2,
                      Color = RGB::Blue, FillColorType = Flat,
                      Name = "Name: cos"),

As a last resort, the name of the type of object is used:

plot(plot::Rectangle(0..1, 0..1),
     plot::Point2d(frandom(), frandom()),
     plot::Point2d(frandom(), frandom()),
     plot::Point2d(frandom(), frandom()),
     plot::Point2d(frandom(), frandom()),
     plot::Point2d(frandom(), frandom()),
     LegendEntry = TRUE, LegendVisible = TRUE)

See Also

MuPAD Functions

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