Java Reference
In-Depth Information
(a)
(b)
(c)
F
IGURE
13.28
(a) Four panels of geometric figures are displayed in a frame of
GridLayout
. (b)
TicTacToe
cells ran-
domly display X, O, or nothing. (c) Exercise 13.8 draws an octagon.
*13.9
(
Create four fans
) Write a program that places four fans in a frame of
GridLayout
with two rows and two columns, as shown in Figure 13.29a.
*13.10
(
Display a cylinder
) Write a program that draws a cylinder, as shown in Figure 13.29b.
(a)
(b)
(c)
F
IGURE
13.29
(a) Exercise 13.9 draws four fans. (b) Exercise 13.10 draws a cylinder. (c) Exercise 13.11 draws a dia-
gram for function
f
(
x
)
x
2
.
=
*13.11
(
Plot the square function
) Write a program that draws a diagram for the function
(see Figure 13.29c).
Hint
: Add points to a polygon
p
using the following loop:
x
2
f
(
x
)
=
double
scaleFactor =
0.1
;
for
(
int
x =
-100
; x <=
100
; x++) {
p.addPoint(x +
200
,
200
- (
int
)(scaleFactor * x * x));
}
Connect the points using
g.drawPolyline(p.xpoints, p.ypoints,
p.npoints)
for a
Graphics
object
g
.
p.xpoints
returns an array of
x
-
coordinates,
p.ypoints
an array of
y
-coordinates, and
p.npoints
the number
of points in
Polygon
object
p
.
**13.12
(
Plot the sine and cosine functions
) Write a program that plots the sine function in
red and cosine in blue, as shown in Figure 13.30a.
VideoNote
Plot a function
