MATLAB Object-Oriented Programming

• Allowing each specialized GraphInterface object to implement whatever additional
  properties it requires to give class users control over those characteristics.

Define the Interface

The GraphInterface class is an abstract class that defines the methods and properties

used by the subclasses. Comments in the abstract class describe the intended

implementation:

classdef GraphInterface < handle

% Abstract class for creating data graphs

% Subclass constructor should accept

% the data that is to be plotted and

% property name/property value pairs

properties (SetAccess = protected, GetAccess = protected)

Primitive

AxesHandle

end

properties

Data

end

methods (Abstract)

draw(obj)

% Use a line, surface,

% or patch graphics primitive

zoom(obj,factor)

% Change the CameraViewAngle

% for 2D and 3D views

% use camzoom for consistency

updateGraph(obj)

% Update the Data property and

% update the drawing primitive

end

methods

function set.Data(obj,newdata)

obj.Data = newdata;

updateGraph(obj)

end

function addButtons(gobj)

hfig = get(gobj.AxesHandle,'Parent');

uicontrol(hfig,'Style','pushbutton','String','Zoom Out',...

'Callback',@(src,evnt)zoom(gobj,.5));

uicontrol(hfig,'Style','pushbutton','String','Zoom In',...

12 How to Build on Other Classes