Game Development Reference
In-Depth Information
Figure 4.12
The vertical line test reveals that the graphical representations of different sets of coordinates do not
represent functions.
Discontinuous Lines
Graphs that represent functions do not have to be continuous. Figure 4.13
illustrates a graph of a discontinuous line. The graph passes the vertical line test
because all domain values generate unique range values. The fact that no values
can be found along the
x
axis that are less than 5 and greater than
5 does not
change things. The
y
, or range values, are all the same for the ordered pairs you
