Java Reference
In-Depth Information
protected
AbstractDrawFunction () {
drawFunction();
}
/** Return the y-coordinate */
abstract double
f(
double
x);
/** Obtain points for x-coordinates 100, 101, . . ., 300 */
public void
drawFunction() {
for
(
int
x =
-100
; x <=
100
; x++) {
p.addPoint(x +
200
,
200
- (
int
)f(x));
}
}
@Override
/** Draw axes, labels, and connect points */
protected void
paintComponent(Graphics g) {
// To be completed by you
}
}
Test the class with the following functions:
f(x) = x
2
;
a.
b.
f(x) = sin(x);
c.
f(x) = cos(x);
d.
f(x) = tan(x);
e.
f(x) = cos(x) + 5sin(x);
f.
f(x) = 5cos(x) + sin(x);
f(x) = log(x) + x
2
;
g.
For each function, create a class that extends the
AbstractDrawFunction
class and implements the
f
method. Figure 15.9 displays the drawings for the
first three functions.
F
IGURE
15.9
Exercise 15.1 draws the square, sine, and cosine functions.
**15.2
(
Triangle class
) Design a new
Triangle
class that extends the abstract
GeometricObject
class. Draw the UML diagram for the classes
Triangle
and
GeometricObject
and then implement the
Triangle
class. Write a test
program that prompts the user to enter three sides of the triangle, a color, and a
Boolean value to indicate whether the triangle is filled. The program should cre-
ate a
Triangle
object with these sides and set the color and filled properties
using the input. The program should display the area, perimeter, color, and true
or false to indicate whether it is filled or not.
