MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guia do Utilizador descarregar pdf (Página 399)

100

101

GUI for Animating a 3-D View (GUIDE)

• “Create the Graphic Objects” on page 10-25

• “Texture and Color the Globe” on page 10-26

• “Plot the Graticule” on page 10-26

• “Orient the Globe and Graticule” on page 10-27

• “Light the Globe and Shift the Light Source” on page 10-28

Create the Graphic Objects

The axes1_CreateF cn function initializes the axes, the two objects displayed

in it, a nd two

hgtransform objects that affect the rotation of the globe:

• The globe, a

surfaceplot object, generated by a call to surface.

• The geographic graticule (lines of latitude and longitude), also a

surfaceplot object, generated by a call to mesh.

Data for these two objects are rectangular x-y-z grids generated by the

sphere

function. The globe’s grid is 50-by-50 and the graticule grid is 8-by-15. (Every

other row of the 15-by-15 g rid returned by

sphere is removed t o equalize its

North-South and East-West spans when viewed on the globe.)

The axes x-, y-, and z-limits are set to

[-1.02 1.02].Becausethegraphic

objects are unit spheres, this leaves a little space around them while

constraining all three axes to r em ain the same relative and absolute size. The

graticule grid is also enlarged by 2%, which is barely enough to prevent the

opaque texture-mapped surface of the globe from obscuring the graticule. If

you w atch carefully, you can sometimes see missing pieces of graticule edges

as the globe spins.

Tip uipanels enclose the axes and the uicontrols. This makes the axes a

child of the uipanel that contains it. Containing axes in uipanels speeds up

graphic rendering by localizing the portion of the figure where M ATLAB

graphics functions redraw graphics.

10-25

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