如何更改散点图中的点大小？

Question

我ScatterChart在 JavaFX 中做了这个： 如何设置数据点大小？

我发现它应该在 CSS 中完成，但即使有docs，我仍然无法弄清楚。

Answer 1

用

.chart-symbol {
    -fx-background-radius: 10px ;
    -fx-padding: 10px ;
}

如果您需要将其仅应用于特定图表，请为图表指定一个 id 并在 CSS 文件中使用该 id：

chart.setId("bifurcation-diagram");

chart.setId("bifurcation-diagram");

SSCCE：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ScatterChart;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.stage.Stage;

public class ScatterChartExample extends Application {

    @Override
    public void start(Stage primaryStage) {

        ScatterChart<Number, Number> chart = new ScatterChart<>(new NumberAxis(), new NumberAxis());

        chart.setId("bifurcation-diagram");

        Series<Number, Number> series = new Series<>();
        chart.getData().add(series);

        for (int i = 0 ; i <= 100; i++) {
            double lambda = 4.0 * i / 100 ;
            double x = 0.5 ;
            for (int j = 0 ; j < 100 ; j++) {
                x = lambda * x * (1-x);
            }
            for (int j = 0 ; j < 50; j++) {
                series.getData().add(new Data<>(lambda, x));
                x = lambda * x * (1-x);
            }
        }

        Scene scene = new Scene(chart, 1200, 800);
        scene.getStylesheets().add("bifurcation.css");
        primaryStage.setScene(scene);
        primaryStage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }
}

分叉.css：

#bifurcation-diagram .chart-symbol {
    -fx-background-radius: 10px ;
    -fx-padding: 10px ;
}

如果你想要更小的点，这似乎效果不佳（我假设是因为它们与为图表数据生成的默认节点不兼容）。在这种情况下，您可能还需要为数据设置节点：

for (int i = 0 ; i <= 400; i++) {
    double lambda = 1.0 * i / 100 ;
    double x = 0.5 ;
    for (int j = 0 ; j < 100 ; j++) {
        x = lambda * x * (1-x);
    }
    for (int j = 0 ; j < 50; j++) {
        Data<Number, Number> data = new Data<>(lambda, x);
        Region plotpoint = new Region();
        plotpoint.setShape(new Circle(0.5));
        data.setNode(plotpoint);
        series.getData().add(data);
        x = lambda * x * (1-x);
    }
}

和 CSS

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ScatterChart;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.stage.Stage;

public class ScatterChartExample extends Application {

    @Override
    public void start(Stage primaryStage) {

        ScatterChart<Number, Number> chart = new ScatterChart<>(new NumberAxis(), new NumberAxis());

        chart.setId("bifurcation-diagram");

        Series<Number, Number> series = new Series<>();
        chart.getData().add(series);

        for (int i = 0 ; i <= 100; i++) {
            double lambda = 4.0 * i / 100 ;
            double x = 0.5 ;
            for (int j = 0 ; j < 100 ; j++) {
                x = lambda * x * (1-x);
            }
            for (int j = 0 ; j < 50; j++) {
                series.getData().add(new Data<>(lambda, x));
                x = lambda * x * (1-x);
            }
        }

        Scene scene = new Scene(chart, 1200, 800);
        scene.getStylesheets().add("bifurcation.css");
        primaryStage.setScene(scene);
        primaryStage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }
}