alphamap (MATLAB Functions)

Specify the figure alphamap (transparency)

Syntax

alphamap(alpha_map)
alphamap('parameter')
alphamap('parameter',length)
alphamap('parameter',delta)
alphamap(figure_handle,...)
alpha_map = alphamap
alpha_map = alphamap(figure_handle)
alpha_map = alphamap('parameter')

Description

alphamap enables you to set or modify a figure's Alphamap property. Unless you specify a figure handle as the first argument, alphamap operates on the current figure.

alphamap(alpha_map) sets the AlphaMap of the current figure to the specified m-by-1 array of alpha values.

alphamap('parameter') creates a new alphamap or modifies the current alphamap. You can specify the following parameters:

default -- Set the AlphaMap property to the figure's default alphamap.
rampup -- Create a linear alphamap with increasing opacity (default length equals the current alphamap length).
rampdown -- Create a linear alphamap with decreasing opacity (default length equals the current alphamap length).
vup -- Create an alphamap that is opaque in the center and becomes more transparent linearly towards the beginning and end (default length equals the current alphamap length).
vdown -- Create an alphamap that is transparent in the center and becomes more opaque linearly towards the beginning and end (default length equals the current alphamap length).
increase -- Modify the alphamap making it more opaque (default delta is .1, which is added to the current values).
decrease -- Modify the alphamap making it more transparent (default delta is .1, which is subtracted from the current values).
spin -- Rotate the current alphamap (default delta is 1; note that delta must be an integer).

alphamap('parameter',length) creates a new alphamap with the length specified by length (used with parameters rampup, rampdown, vup, vdown).

alphamap('parameter',delta) modifies the existing alphamap using the value specified by delta (used with parameters increase, decrease, spin).

alphamap(figure_handle,...) performs the operation on the alphamap of the figure identified by figure_handle.

alpha_map = alphamap returns the current alphamap.

alpha_map = alphamap(figure_handle) returns the current alphamap from the figure identified by figure_handle.

alpha_map = alphamap('parameter') returns the alphamap modified by the parameter, but does not set the AlphaMap property.

See Also

alim, alpha

Image: AlphaData, AlphaDataMapping

Patch: FaceAlpha, AlphaData, AlphaDataMapping

Surface: FaceAlpha, AlphaData, AlphaDataMapping

Transparency for related functions

Transparency in 3-D Visualization for examples

        3, 2, 7;
        1, 5, 3;
        2, 6, 1];
area(Y)
grid on
colormap summer
set(gca,'Layer','top')

alpha ancestor