JAVAFX BASICS - Introduction to Java Programming: Comprehensive Version - page 570

(40, 20)

(40, 20)

(70, 40) (70, 40)

(45, 45) (45, 45)

(20, 60)

(20, 60)

(60, 80) (60, 80)

(a) Polygon (b) Polyline

F IGURE 14.38

Polygon is closed and Polyline is not closed.

The UML diagram for the Polygon class is shown in Figure 14.39. Listing 14.19 gives an
example that creates a hexagon, as shown in Figure 14.40.

The getter and setter methods for property values
and a getter for property itself are provided in the class,
but omitted in the UML diagram for brevity.

javafx.scene.shape.Arc

+Polygon()
+Polygon(double... points)
+getPoints():
ObservableList<Double>

Creates an empty Polygon .
Creates a Polygon with the given points.
Returns a list of double values as x-and y-coordinates of the points.

F IGURE 14.39

Polygon defines a polygon.

(x, y)
x is centerX radius cos(2 /6)

y is centerY radius sin(2 /6)

6

2

radius

(centerX, centerY)

(a) (b)

F IGURE 14.40

(a) A Polygon is displayed. (b) A Polyline is displayed.

L ISTING 14.19

ShowPolygon.java
1 import javafx.application.Application;
2 import javafx.collections.ObservableList;
3 import javafx.scene.Scene;
4 import javafx.scene.layout.Pane;
5 import javafx.scene.paint.Color;
6 import javafx.stage.Stage;
7 import javafx.scene.shape.Polygon;