Game Development Reference
In-Depth Information
Figure 10.25
Different y-intercept values shift the parabolas up and down the y axis.
The generalization then arises that if the value of the y-intercept exceeds 0, then
the graph shifts upward. On the other hand, if the value of the y-intercept is less
than 0, then the graph shifts downward. When the value of the y-intercept
equals 0, then the vertex of the graph rests on the
x
axis.
To employ Visual Formula to implement a set of non-linear equations that are
shifted along the
y
axis, use these steps (refer to Figure 10.25):
1. Click the menu item for Value. To position the Value field, click in the upper
equation composition area. Type x in the Value field.
2. Click the Power menu item. Click to place the field for the exponent to the
upper right of the Value field. Type 2 in the Exponent field.
3. Click the Add menu item. Then click to the right of the Value field to
position the plus sign.
