Matlab-like plotting library >> Matlab-like plotting library > Plotlib 0.4
Plotlib 0.4
Overview of plotlib features
This library aims to emulate Matlab graphics features, i.e. macros and property/value pairs. Some
already existing Scilab macros already correctly emulate the Matlab ones and were not considered in the Plotlib.
Recall of the Matlab-like native Scilab macros
title - add a title to a given or current Axes
xlabel - add a label on the X axis to a given or current Axes
ylabel - add a label on the Y axis to a given or current Axes
zlabel - add a label on the Z axis to a given or current Axes
Plotlib general functions
axis - set/get the axis limits and type
figure - creates/activates a figure
grid - add/toggle a grid on a graph
hold - holds/releases current plot
legend - adds a legend
shg - brings a window on the foreground
subplot - Create axes in tiled positions.
drawnow - Flushed postponed graphics commands.
Plotlib 2D functions
pcolor - 2D pseudo color patches
plot - generic plot function.
plotyy - generic plot function.
fill - fill 2D polygons
loglog - plot with logarihtmic x andy scale
quiver - vector field plot
semilogx - plot with logarihtmic x scale
semilogy - plot with logarihtmic y scale
tripcolor - 2D pseudo color patches based on a triangulation
triplot - plot 2D mesh based on a triabgulation
Plotlib 3D functions
fill3 - fill 3D polygons
plot3 - Plot lines and points in 3-D space.
mesh - 3D mesh surface.
surf - 3D colored surface.
surfl - 3D surface with lighting
quiver3 - 3d vector field defined on a surface
trimesh - 3D surface mesh based on a triangulation
trisurf - 3D colored surface based on a triangulation
trisurfl - 3D surface based on a triangulation, with lighting
view - sets the view point
Plotlib Color management
The plotlib differentiates the colormap used for axes, polyline and other linear entities and the colormap for pesudo-color
2D and surface plots. The actual color of such entities is determined by their CData and CDataMapping properties and by the CLim and CLimMode
properties of the parent Axes. When CLimMode is equal to 'auto' the the CLim property changes dynamically as entites are added or removed from the Axes.
caxis - set/get color axis
colormap - Set/get the colormap of currently active figure
colorbar - Adds a colorbar
shading - Change the shading model
whitebg - Set the default color scheme
Plotlib new graphic objects properties
The new properties of graphical entities are fields of the user_data field and a Plotlib graphic handle is just a Scilab native graphic handle encapsulated in a mlist of type "pltlibH". By using the overloading features of Scilab, these two kinds of handles can be read or changed transparently by using the set and get macros. The native Scilab graphic properties of the encapsulated handle are also transparently read or changed by these two macros.
The default display function %pltlibH_p for plotlib handles just gives the type of the handle. To display and/or get a single property, you can use the get function or the . field operator. Idem for the set operation :
h=surfl()
z=get(h,'ZData');
z=h.ZData;
set(h,'CData',z);
h.CData=rand(z); |  |  | |
You can get more than one property value at a time, by using a vector of strings, or get all properties by omitting the property. In both cases, get returns a struct with corresponding fieldnames.
h=pcolor()
get(h,['FaceColor','EdgeColor'])
get(h) | | | |
Leaf properties - Leaf properties
Axes properties - Axes properties
Figure properties - Figure properties