如何更改单个条形的颜色 java fx [英] How to change color of a single bar java fx

问题描述

这是我的代码，它生成从 0 到 10 的 10 个值的条形图.我想按如下方式更改条形的颜色

Here is my code which generates bar chart of 10 values from 0 to 10 . i want to change the color of bars as follows

if i>5 color==red如果 i>8 色==蓝色

if i>5 color==red if i>8 color==blue

所以最终输出将是 0-5(默认黄条)6-8(红条)9(蓝条)

so the final out will be 0-5(default yellow bars) 6-8(Red bars) 9(blue bar)

请帮助我..谢谢

public class BarChartSample extends Application {

    @Override
    public void start(Stage stage) {
        stage.setTitle("Bar Chart Sample");
        final CategoryAxis xAxis = new CategoryAxis();
        final NumberAxis yAxis = new NumberAxis();
        final BarChart < String, Number > bc = new BarChart < String, Number > (xAxis, yAxis);

        bc.setTitle("Country Summary");
        xAxis.setLabel("bars");
        yAxis.setLabel("Value");
        XYChart.Series series1 = new XYChart.Series();
        series1.setName("...");

        for (int i = 0; i < 10; i++) {
            //here i want to change color of bar if value of i is >5 than red if i>8 than blue
            series1.getData().add(new XYChart.Data("Value", i));
        }
    }

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

推荐答案

我创建了一个示例解决方案.

解决方案的工作原理是根据条形数据的值将条形的 -fx-bar-fill 颜色设置为不同的颜色.

The solution works by setting the bar's -fx-bar-fill color to a different color based on the value of the bar's data.

final XYChart.Data<String, Number> data = new XYChart.Data("Value " + i , i);
data.nodeProperty().addListener(new ChangeListener<Node>() {
  @Override public void changed(ObservableValue<? extends Node> ov, Node oldNode, Node newNode) {
    if (newNode != null) {
      if (data.getYValue().intValue() > 8 ) {
        newNode.setStyle("-fx-bar-fill: navy;");
      } else if (data.getYValue().intValue() > 5 ) {
        newNode.setStyle("-fx-bar-fill: firebrick;");
      }  
    }
  }
});

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