Graphics with JavaFX - Java 8 Recipes - page 617

leftButton.setRadiusX(15);
leftButton.setRadiusY(15);
leftButton.setStartAngle(-30);
leftButton.setLength(60);
leftButton.setFill(new Color(1, 1, 1, .90));
leftButton.addEventHandler(MouseEvent.MOUSE_PRESSED,
(MouseEvent me) -> {
int indx = gotoImageIndex(ButtonMove.PREV);
if (indx > -1) {
String namePict = imageFiles.get(indx);
namePict = filePrefix + namePict;
final Image image = new Image(namePict);
currentImageView.setImage(image);
}
});
buttonGroup.getChildren().add(leftButton);
// right control
Arc rightButton = new Arc();
rightButton.setType(ArcType.ROUND);
rightButton.setCenterX(12);
rightButton.setCenterY(16);
rightButton.setRadiusX(15);
rightButton.setRadiusY(15);
rightButton.setStartAngle(180 - 30);
rightButton.setLength(60);
rightButton.setFill(new Color(1, 1, 1, .90));
rightButton.setTranslateX(40);
buttonGroup.getChildren().add(rightButton);
rightButton.addEventHandler(MouseEvent.MOUSE_PRESSED,
(MouseEvent me) -> {
int indx = gotoImageIndex(ButtonMove.NEXT);
if (indx > -1) {
String namePict = imageFiles.get(indx);
namePict = filePrefix + namePict;
final Image image = new Image(namePict);