SunburstChart.java 文件源码

private Path createSegment(final double START_ANGLE, final double END_ANGLE, final double INNER_RADIUS, final double OUTER_RADIUS, final Color FILL, final Color STROKE, final TreeNode NODE) {
    double  startAngleRad = Math.toRadians(START_ANGLE + 90);
    double  endAngleRad   = Math.toRadians(END_ANGLE + 90);
    boolean largeAngle    = Math.abs(END_ANGLE - START_ANGLE) > 180.0;

    double x1 = centerX + INNER_RADIUS * Math.sin(startAngleRad);
    double y1 = centerY - INNER_RADIUS * Math.cos(startAngleRad);

    double x2 = centerX + OUTER_RADIUS * Math.sin(startAngleRad);
    double y2 = centerY - OUTER_RADIUS * Math.cos(startAngleRad);

    double x3 = centerX + OUTER_RADIUS * Math.sin(endAngleRad);
    double y3 = centerY - OUTER_RADIUS * Math.cos(endAngleRad);

    double x4 = centerX + INNER_RADIUS * Math.sin(endAngleRad);
    double y4 = centerY - INNER_RADIUS * Math.cos(endAngleRad);

    MoveTo moveTo1 = new MoveTo(x1, y1);
    LineTo lineTo2 = new LineTo(x2, y2);
    ArcTo  arcTo3  = new ArcTo(OUTER_RADIUS, OUTER_RADIUS, 0, x3, y3, largeAngle, true);
    LineTo lineTo4 = new LineTo(x4, y4);
    ArcTo  arcTo1  = new ArcTo(INNER_RADIUS, INNER_RADIUS, 0, x1, y1, largeAngle, false);

    Path path = new Path(moveTo1, lineTo2, arcTo3, lineTo4, arcTo1);

    path.setFill(FILL);
    path.setStroke(STROKE);

    String tooltipText = new StringBuilder(NODE.getData().getName()).append("\n").append(String.format(Locale.US, formatString, NODE.getData().getValue())).toString();
    Tooltip.install(path, new Tooltip(tooltipText));

    path.setOnMousePressed(new WeakEventHandler<>(e -> NODE.getTreeRoot().fireTreeNodeEvent(new TreeNodeEvent(NODE, EventType.NODE_SELECTED))));

    return path;
}