Ground

Base value

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Value Summary

OptionalMuPAD® expression

Graphics Primitives

ObjectsGround Default Values
plot::Bars3d, plot::Sweep0

Description

In bar charts, the attribute Ground = g determines the vertical coordinate value of one end of the bars. Data values m > g are displayed as bars stretching in the vertical direction from the lower end g up to the upper end m. Data values m < g are displayed as bars stretching in the vertical direction from the upper end g down to the lower end m.

In sweep surfaces of type plot::Sweep, a parametrized space curve (x(u), y(u), z(u)) is projected to the x-y-plane with constant z = g, where g is set by the Ground attribute.

The parameter g has to be a numerical real value or an expression of the animation parameter.

If the attribute Ground = g is not specified, the default value g = 0 is used.

Examples

Example 1

We plot the same data with different Ground values:

A := matrix::random(5, 5, frandom):
plot(plot::Scene3d(plot::Bars3d(A, Ground = 0,
                                Color = RGB::Grey)),
     plot::Scene3d(plot::Bars3d(A, Ground = 0.5,
                                Color = RGB::Grey)),
     Layout = Horizontal):

In the next call, the ground level is animated. Note that in animations one must specify ranges for the x and y coordinates. We include a transparent plane visualizing the ground level:

plot(plot::Bars3d(A, x = 0 .. 1, y = 0 .. 1, a = 0 .. PI,
                  Color = RGB::Grey,
                  Gap = [0.5, 0.5],
                  Ground = sin(a)),
     plot::Surface([x, y, sin(a) + 0.001],
                   x = 0 .. 1, y = 0 .. 1, a = 0 .. PI,
                   Mesh = [2, 2], Color = RGB::Blue.[0.5])
):

delete A:

Example 2

We use different Ground values to project a space curve to the x-y-plane:

plot(plot::Scene3d(plot::Sweep([u, 1-u, sin(2*PI*u)], u = 0..1,
                        Ground =  1), Header = "Ground = 1"),
     plot::Scene3d(plot::Sweep([u, 1-u, sin(2*PI*u)], u = 0..1,
                        Ground = 0.5), Header = "Ground = 0.5"),
     plot::Scene3d(plot::Sweep([u, 1-u, sin(2*PI*u)], u = 0..1,
                        Ground = 0), Header = "Ground = 0"),
     plot::Scene3d(plot::Sweep([u, 1-u, sin(2*PI*u)], u = 0..1,
                        Ground = -1), Header = "Ground = -1"),
     plot::Scene3d::BorderWidth = 0.5*unit::mm, 
     Layout = Tabular, Rows = 2)