LRInspectorController.java 文件源码

/**
 * create a horizontal axis
 *
 * @param maxReadLength
 * @return axis
 */
public static Pane createAxis(final ReadOnlyIntegerProperty maxReadLength, final ReadOnlyDoubleProperty widthProperty) {
    final Pane pane = new Pane();
    pane.prefWidthProperty().bind(widthProperty);

    final NumberAxis axis = new NumberAxis();
    axis.setSide(Side.TOP);
    axis.setAutoRanging(false);
    axis.setLowerBound(0);
    axis.prefHeightProperty().set(20);
    axis.prefWidthProperty().bind(widthProperty.subtract(60));

    final ChangeListener<Number> changeListener = new ChangeListener<Number>() {
        @Override
        public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
            int minX = Math.round(maxReadLength.get() / 2000.0f); // at most 2000 major ticks
            for (int x = 10; x < 10000000; x *= 10) {
                if (x >= minX && widthProperty.doubleValue() * x >= 50 * maxReadLength.doubleValue()) {
                    axis.setUpperBound(maxReadLength.get());
                    axis.setTickUnit(x);
                    return;
                }
            }
            axis.setTickUnit(maxReadLength.get());
            axis.setUpperBound(maxReadLength.get());
        }
    };

    maxReadLength.addListener(changeListener);
    widthProperty.addListener(changeListener);

    pane.getChildren().add(axis);
    return pane;
}