更改不同值的图表颜色

时间:2014-02-19 09:49:08

标签: javafx javafx-2 javafx-8 stacked-area-chart

我想创建温度图表,我可以实时监控温度。

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.StackedAreaChart;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;

public class MainApp extends Application
{

    final NumberAxis xAxis = new NumberAxis(1, 31, 1);
    final NumberAxis yAxis = new NumberAxis();
    final StackedAreaChart<Number, Number> sac
        = new StackedAreaChart<Number, Number>(xAxis, yAxis);

    @Override
    public void start(Stage stage)
    {


        setUserAgentStylesheet(STYLESHEET_CASPIAN);
        stage.setTitle("Area Chart Sample");
        sac.setTitle("Temperature Monitoring (in Degrees C)");
        XYChart.Series<Number, Number> seriesApril
            = new XYChart.Series<Number, Number>();
        seriesApril.setName("April");
        seriesApril.getData().add(new XYChart.Data(1, 4));
        seriesApril.getData().add(new XYChart.Data(3, 10));
        seriesApril.getData().add(new XYChart.Data(6, 15));
        seriesApril.getData().add(new XYChart.Data(9, 8));
        seriesApril.getData().add(new XYChart.Data(12, 5));
        seriesApril.getData().add(new XYChart.Data(15, 18));
        seriesApril.getData().add(new XYChart.Data(18, 15));
        seriesApril.getData().add(new XYChart.Data(21, 13));
        seriesApril.getData().add(new XYChart.Data(24, 19));
        seriesApril.getData().add(new XYChart.Data(27, 21));
        seriesApril.getData().add(new XYChart.Data(30, 21));
        XYChart.Series<Number, Number> seriesMay
            = new XYChart.Series<Number, Number>();
        seriesMay.setName("May");
        seriesMay.getData().add(new XYChart.Data(1, 20));
        seriesMay.getData().add(new XYChart.Data(3, 15));
        seriesMay.getData().add(new XYChart.Data(6, 13));
        seriesMay.getData().add(new XYChart.Data(9, 12));
        seriesMay.getData().add(new XYChart.Data(12, 14));
        seriesMay.getData().add(new XYChart.Data(15, 18));
        seriesMay.getData().add(new XYChart.Data(18, 25));
        seriesMay.getData().add(new XYChart.Data(21, 25));
        seriesMay.getData().add(new XYChart.Data(24, 23));
        seriesMay.getData().add(new XYChart.Data(27, 26));
        seriesMay.getData().add(new XYChart.Data(31, 26));
        Scene scene = new Scene(sac, 800, 600);
        sac.getData().addAll(seriesApril);
        stage.setScene(scene);
        stage.show();
    }

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

我想改变图表的高度温度颜色。例如,我希望温度在10到20之间,绿色,温度在40到50之间,红色。你能帮我实现吗?

1 个答案:

答案 0 :(得分:3)

这只适用于CSS 将以下行添加到CSS中,并为图表指定标识temperatureChart

#temperatureChart .series0.chart-series-area-fill {
    -fx-fill: linear-gradient(to top, #0984df, #00d8ff 20%, #fff000 60%, #ff0000) ;
}

你必须弄清楚正确的百分比值。

希望这有帮助,
Kalasch

编辑(代码方式):
要在代码中执行此操作,您可以执行以下操作(建议您检查查找是否为空):

sac.lookup("#temperatureChart .series0.chart-series-area-fill")
.setStyle("-fx-fill: linear-gradient(to top, #0984df, #00d8ff 20%, #fff000 60%, #ff0000);");

推荐这样做,但如果没有别的办法......