Graphics Reference
In-Depth Information
Y
Translated
Original
X
Fig. 7.1.
The translated shape results by adding 3 to every
x
-coordinate, and 1 to
every
y
-coordinate of the original shape.
Fig. 7.2.
The scaled shape results by multiplying every
x
-coordinate by 2 and every
y
-coordinate by 1.5.
This transform results in a horizontal scaling of 2 and a vertical scaling of
1.5, as illustrated in Figure 7.2. Note that a point located at the origin does
not change its place, so scaling is relative to the origin.
7.1.3 Reflection
To make a reflection of a shape relative to the
y
-axis, we simply reverse the
sign of the
x
-coordinate, leaving the
y
-coordinate unchanged
x
=
−
x
y
=
y
(7.2)
