Graphics Reference
In-Depth Information
Figure
.
.
Classes for basic graphics
value,
lineWidth
for storing the width of the connected line segments by a dou-
ble value, and
connectionGroups
for recording the group of connected points
given by an
ArrayList
class.
Wehavesimilarclassesthatextend
BasicPlotModel
andarespecifictopartic-
ular statistical graphics:
HistogramPlotModel
and
SingleBoxPlotModel
.
See Fig.
.
.
Classes for Drawing Basic Graphics
17.3.5
Plotter
is an interface for plotting and interactive operations. It declares methods
such as
draw
,
drawFrame
,
drawRulers
,and
plot
.
Classes that implement the
Plotter
interface draw graphics of the correspond-
ing
PlotModel
in the Java graphics context. For example,
ScatterPlotModel
accompanies
ScatterPlotter
,and
HistogramPlotModel
accompanies
HistogramPlotter
. hey realize methods for drawing particular graphics. he
objects of these classes are automatically created by
createPlotter
methods of
the corresponding
PlotModel
classes. his mechanism is an example of the “Fac-
tory method” design pattern.
Factory method defines an interface for creating an object, but let the sub-
classes decide which class to instance. Factory method lets a class defer in-
stantiation to subclasses (Gamma et al.,
).
It is oten not clear what kind of components we will use at the firststage of program-
ming, although we have a general idea of the operations of certain components. We
want to implement the components later. We can achieve this functionality by using
interfaces for these components. As an interface has no function to create an object,
we use a method for creating an object called the factory method. his technique is
useful for creating two or more tightly connected objects.
