- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to color the plotted area of a JavaFX xy-chart?
All the XY charts have an abstract method named layoutPlotChildren(). To color the plotted area (region) of an XY chart one way is to override this method. Generally, it is called to update and layout the plot of children.
In the body of this method −
Get the series data.
Extract the plotted points.
Draw a polygon in the plotted area using the extracted points.
Set the desired color to the polygon.
Example
import javafx.application.Application; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.scene.Scene; import javafx.stage.Stage; import javafx.scene.chart.LineChart; import javafx.scene.chart.NumberAxis; import javafx.scene.chart.XYChart; import javafx.scene.chart.XYChart.Series; import javafx.scene.layout.StackPane; import javafx.scene.paint.Color; import javafx.scene.shape.Polygon; public class EnhancingGraphPlot extends Application { public void start(Stage stage) { //Defining the x axis NumberAxis xAxis = new NumberAxis(1960, 2020, 10); xAxis.setLabel("Years"); //Defining the y axis NumberAxis yAxis = new NumberAxis (0, 350, 50); yAxis.setLabel("No.of schools"); //Preparing the data for the X-Y chart XYChart.Series<Number,Number> series = new XYChart.Series<Number,Number>(); series.setName("No of schools in an year"); series.getData().add(new XYChart.Data<Number,Number>(1970, 15)); series.getData().add(new XYChart.Data<Number,Number>(1980, 30)); series.getData().add(new XYChart.Data<Number,Number>(1990, 60)); series.getData().add(new XYChart.Data<Number,Number>(2000, 120)); series.getData().add(new XYChart.Data<Number,Number>(2013, 240)); series.getData().add(new XYChart.Data<Number,Number>(2014, 300)); //Creating data ObservableList<Series<Number, Number>> data = FXCollections.observableArrayList(series); //Creating the Line chart LineChart<Number,Number> lineChart = new LineChart<Number,Number>(xAxis, yAxis, data ) { //Overriding the layoutPlotChildren method protected void layoutPlotChildren() { super.layoutPlotChildren(); Series<Number,Number> series = (Series<Number,Number>) getData().get(0); ObservableList<Data<Number,Number>> listOfData = series.getData(); for(int i = 0; i < listOfData.size()-1; i++) { double x1 = getXAxis().getDisplayPosition(listOfData.get(i).getXValue()); double y1 = getYAxis().getDisplayPosition(0); double x2 = getXAxis().getDisplayPosition(listOfData.get((i + 1)).getXValue()); double y2 = getYAxis().getDisplayPosition(0); Polygon polygon = new Polygon(); polygon.getPoints().addAll(new Double[]{ x1,y1, x1, getYAxis().getDisplayPosition(listOfData.get(i).getYValue()), x2,getYAxis().getDisplayPosition(listOfData.get((i+1)).getYValue()), x2,y2 }); getPlotChildren().add(polygon); polygon.toFront(); polygon.setFill(Color.DIMGRAY); } } }; //Adding the line chart to stack pane StackPane pane = new StackPane(lineChart); //Setting the scene Scene scene = new Scene(pane, 595, 300); stage.setTitle("Line Chart"); stage.setScene(scene); stage.show(); } public static void main(String args[]){ launch(args); } }
Output
Advertisements