JavaFX 着色 XYChart.Series

Question

我正在尝试设置我的 JavaFX 面积图的样式，但找不到任何方法来为特定系列设置颜色。我知道，我可以通过 CSS 设置样式，但我也想在代码中这样做。

我该怎么做？ 1.) 如何使用内联样式为 Area-Chart 设置颜色？

感谢您的帮助。

@何塞:

我以前是这样操作的，但是对我不起作用!

@Override
    public void start(Stage primaryStage)
    {
        final AreaChart<String, Number> areaChart = new AreaChart<>(new CategoryAxis(), new NumberAxis());

        ObservableList<XYChart.Data<String, Integer>> xyList = FXCollections.observableArrayList(
            new XYChart.Data<>("P1", 30),
            new XYChart.Data<>("P2", 40),
            new XYChart.Data<>("P3", 30));
        XYChart.Series series = new XYChart.Series(xyList);
        areaChart.getData().addAll(series);

        Button button = new Button("Change style");
        button.setOnAction(new EventHandler<ActionEvent>()
        {

            @Override
            public void handle(ActionEvent arg0)
            {
                int redColor = 0, greenColor = 127, blueColor = 195;
                double opacity = 0.3;
                areaChart.setStyle("CHART_COLOR_1: rgb(" + redColor + "," + greenColor + "," + blueColor + "); "
                    + "CHART_COLOR_1_TRANS_20: rgba(" + redColor + "," + greenColor + "," + blueColor + "," + opacity + ");");

            }
        });

        VBox root = new VBox();
        root.getChildren().addAll(button, areaChart);
        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

Answer 1

这answer在 Java 7 中不起作用，因为默认的 CSS 样式表是 Caspian，而不是 Modena。

在里海中，主调色板的这些常量未定义:CHART_COLOR_1、CHART_COLOR_1_TRANS_20、...

因此，如果您想应用内联样式，一种方法是通过查找找到系列，然后根据它们的 CSS 选择器将样式应用于符号、线条和/或区域。例如:

@Override
public void start(Stage primaryStage) {

    final AreaChart<String, Number> areaChart = new AreaChart<>(new CategoryAxis(), new NumberAxis());

    ObservableList<XYChart.Data<String, Integer>> xyList = FXCollections.observableArrayList(
        new XYChart.Data<>("P1", 30),
        new XYChart.Data<>("P2", 40),
        new XYChart.Data<>("P3", 30));
    XYChart.Series series = new XYChart.Series(xyList);
    areaChart.getData().addAll(series);

    Scene scene = new Scene(areaChart, 400, 300);
    primaryStage.setScene(scene);
    primaryStage.show();

    int redColor = 0, greenColor = 127, blueColor = 195;
    double opacity = 0.3;

    for(Node symbol : areaChart.lookupAll(".default-color0.chart-area-symbol")){
        symbol.setStyle("-fx-background-color: rgb(" + redColor + "," + greenColor + "," + blueColor + "), white; ");
    }
    Node line = areaChart.lookup(".default-color0.chart-series-area-line");
    line.setStyle("-fx-stroke: rgb(" + redColor + "," + greenColor + "," + blueColor + "); ");
    Node area = areaChart.lookup(".default-color0.chart-series-area-fill");
    area.setStyle("-fx-fill: rgba(" + redColor + "," + greenColor + "," + blueColor + "," + opacity + "); ");
}

编辑

上述解决方案最多适用于 8 个系列。

对于任何数量的系列，这种其他方法也适用:

    int numSeries=10;
    final int[] redColor = new int[numSeries];
    Arrays.fill(redColor, 0);
    final int[] greenColor =new int[numSeries]; 
    Arrays.fill(greenColor, 127);
    final int[] blueColor = new int[numSeries];
    Arrays.fill(blueColor, 195);
    double opacity = 0.3;


    for(int i=0; i<numSeries; i++){
        for(Node n : areaChart.lookupAll(".series"+i)){
            n.setStyle("-fx-background-color: rgb(" + redColor[i] + "," + greenColor[i] + "," + blueColor[i] + "), white; "
                    + "-fx-stroke: rgb(" + redColor[i] + "," + greenColor[i] + "," + blueColor[i] + "); "
                    + "-fx-fill: rgba(" + redColor[i] + "," + greenColor[i] + "," + blueColor[i] + "," + opacity + "); ");
        }
    }