JAVAFX BASICS - Introduction to Java Programming: Comprehensive Version - page 569

39 arc4.setStroke(Color.BLACK);
40 pane.getChildren().add( new Text( 210 , 170 , "arc4: chord" ));
41 pane.getChildren().add(arc4);
42
43 // Create a scene and place it in the stage
44 Scene scene = new Scene(pane, 300 , 200 );
45 primaryStage.setTitle( "ShowArc" ); // Set the stage title
46 primaryStage.setScene(scene); // Place the scene in the stage
47 primaryStage.show(); // Display the stage
48 }
49 }

add arc4 to pane

The program creates an arc arc1 centered at ( 150 , 100 ) with radiusX 80 and radiusY 80 .
The starting angle is 30 with length 35 (line 15). arc1 's arc type is set to ArcType.ROUND
(line 18). Since arc1 's fill color is red, arc1 is displayed filled with red round.
The program creates an arc arc3 centered at ( 150 , 100 ) with radiusX 80 and radiusY 80 .
The starting angle is 30+180 with length 35 (line 29). Arc3 's arc type is set to ArcType.
CHORD (line 31). Since arc3 's fill color is white and stroke color is black, arc3 is displayed
with black outline as a chord.
Angles may be negative. A negative starting angle sweeps clockwise from the easterly
direction, as shown in Figure 14.37. A negative spanning angle sweeps clockwise from the
starting angle. The following two statements define the same arc:

negative degrees

new Arc(x, y, radiusX, radiusY, -30 , -20 );
new Arc(x, y, radiusX, radiusY, -50 , 20 );

The first statement uses negative starting angle -30 and negative spanning angle -20 , as
shown in Figure 14.37a. The second statement uses negative starting angle -50 and positive
spanning angle 20 , as shown in Figure 14.37b.

-30
-20

-50
20

(a) Negative starting angle -30 and
negative spanning angle -20

(b) Negative starting angle -50
and positive spanning angle 20

F IGURE 14.37

Angles may be negative.

Note that the trigonometric methods in the Math class use the angles in radians, but the
angles in the Arc class are in degrees.

14.11.6 Polygon and Polyline
The Polygon class defines a polygon that connects a sequence of points, as shown in
Figure 14.38a. The Polyline class is similar to the Polygon class except that the Polyline
class is not automatically closed, as shown in Figure 14.38b.