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Though it's not essential to know how matlab graphics are organised,
it's likely to be useful sooner or later.
Figures are made of objects (lines, text, images etc). Objects have properties
(like Color, Position, etc) which can be individually controlled.
Each object has a handle (a unique identifier). To experiment
with handles, create a simple graph by typing `plot(1:3)'.
Typing `gcf'
returns the handle of the current figure. `get(handle)' lists
the properties of the given object, so get(gcf) lists all the
properties of the current figure. You can use set to change the
values of these properties once you know the handle of the object and name
of the property. For example, to set the foreground
color of the current figure to green, use set(gcf,'Color','green'). If you type set(gcf) you
get a list of the properties of the current figure, and alternative
settings for these properties.
The axes are children of the figure - and consequently inherit some of
the
figure's properties. If you type
get(gcf,'Children') you'll get the axes handle, which you could
also get by typing `gca'. The axes in turn can have children.
`set' is a powerful mechanism. Often matlab has commands that spare
you needing to use set directly, but particularly
if you want to retrospectively fix something, the facility is useful.
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