Why doesn\'t this draw the charts? Create a Java FX GUI program that allows the
ID: 3580847 • Letter: W
Question
Why doesn't this draw the charts?
Create a Java FX GUI program that allows the user to select and open a file from a menu and then presents a chart of the file's data. Must do the following Program includes a menu Menu allows selection of a file via a file chooser Menu allows selection of several different types of charts Charts correctly display the data from the selected file The goal of this project is to write a Java FX GUI program that uses a menu to control the various program functions and display a chart. The menu should provide functionality to allow the user to select a file and present the file's data in a chart. Additionally the menu should allow the user to select from 4 different JavaFX (BarChart, AreaChart, LineChart, StackedChart) charts. Please use the provided CSV file for the data. The data covers program files written in different languages spread across four quarters.
data.csv Winter Python 42 Winter C++ 150 Winter Java 125 Winter C# 105 Spring Python 65 Spring C++ 110 Spring Java 178 Spring C# 120 Summer Python 56 Summer C++ 109 Summer Java 145 Summer C# 204 Fall Python 64 Fall C++ 95 Fall Java 168 Fall C# 139
The GUI lets me see select the file I want, but does nothing when I try to open the file or select a graph.
ChartMaker.java
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.control.*;
import javafx.scene.input.KeyCombination;
import javafx.scene.layout.BorderPane;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
public class ChartMaker extends Application {
private Label lbl;
private List<DataModel> datalist = new ArrayList<>();
private BarChart<String, Number> myChart = null;
public static void main( String[] args ) {
launch( args );
}
public void start( Stage myStage ){
//Get things set up
myStage.setTitle( "Greg's ChartMaker" );
BorderPane rootNode = new BorderPane();
Scene myScene = new Scene(rootNode, 600, 600);
myStage.setScene( myScene );
//Add a menubar
MenuBar mb = new MenuBar();
//Add file menu stuff to it
Menu fileMenu = new Menu( "_File" );
MenuItem menuOpen = new MenuItem("Open");
MenuItem menuExit = new MenuItem("Exit");
menuExit.setAccelerator(KeyCombination.keyCombination("shortcut+q"));
fileMenu.getItems().addAll(menuOpen, menuExit);
mb.getMenus().add( fileMenu );
//Add chart menu stuff to it
Menu chartMenu = new Menu( "_Chart" );
RadioMenuItem menuBarChart = new RadioMenuItem("Bar chart");
RadioMenuItem menuAreaChart = new RadioMenuItem("Area chart");
RadioMenuItem menuLineChart = new RadioMenuItem("Line chart");
RadioMenuItem menuStackedChart = new RadioMenuItem("Stacked chart");
ToggleGroup tg = new ToggleGroup();
menuBarChart.setToggleGroup( tg );
menuAreaChart.setToggleGroup( tg );
menuLineChart.setToggleGroup( tg );
menuStackedChart.setToggleGroup( tg );
chartMenu.getItems().addAll(menuBarChart, menuAreaChart, menuLineChart, menuStackedChart);
mb.getMenus().add( chartMenu );
//Selecting the 'open' menu item opens a file selection dialog
menuOpen.setOnAction( (ae) -> {
FileChooser f = new FileChooser();
f.setTitle( "Select a file" );
File selectedFile = f.showOpenDialog( myStage );
if( selectedFile != null ){
//read the data from the file
datalist = readData(selectedFile);
}
});
//Selecting the Chart>BarChart menu item builds a bar chart
menuBarChart.setOnAction( (ae) -> {
if (null != datalist) {
doBarChart(datalist);
}
});
//Selecting the exit menu item exits the application
menuExit.setOnAction( (ae)-> {
Platform.exit();
});
//Add it to the top of the BorderPane
rootNode.setTop(mb);
//Draw the chart in the window
rootNode.setCenter(myChart);
//Draw the window
myStage.show();
}
public List readData( File selectedFile) {
//Now do some of that lambda stuff to get the file contents
try {
datalist =
Files.lines( Paths.get(selectedFile.toString())). //Stream of each line
map(l -> new DataModel(l)). // DataModel object for each line
collect(Collectors.toList()); //put the Datamodel objects in a list
} catch (IOException e) {
e.printStackTrace();
}
return datalist;
}
public void doBarChart( List datalist){
//Build the chart
CategoryAxis xAxis = new CategoryAxis();
xAxis.setLabel("Languages");
NumberAxis yAxis = new NumberAxis();
yAxis.setLabel("Program Files");
myChart = new BarChart<String, Number>(xAxis, yAxis);
myChart.setTitle("My Chart");
XYChart.Series<String, Number> spring = new XYChart.Series<>();
XYChart.Series<String, Number> summer = new XYChart.Series<>();
XYChart.Series<String, Number> fall = new XYChart.Series<>();
XYChart.Series<String, Number> winter = new XYChart.Series<>();
for( Object o : datalist) {
DataModel d = (DataModel)o;
if ("Spring" == d.getQuarter()) {
spring.setName(d.getQuarter());
spring.getData().add(new XYChart.Data<String, Number>(d.getLanguage(), d.getCount()));
} else if ("Summer" == d.getQuarter()) {
summer.setName(d.getQuarter());
summer.getData().add(new XYChart.Data<String, Number>(d.getLanguage(), d.getCount()));
} else if ("Fall" == d.getQuarter()) {
fall.setName(d.getQuarter());
fall.getData().add(new XYChart.Data<String, Number>(d.getLanguage(), d.getCount()));
} else {
winter.setName(d.getQuarter());
winter.getData().add(new XYChart.Data<>(d.getLanguage(), d.getCount()));
}
}
myChart.getData().add(spring);
myChart.getData().add(summer);
myChart.getData().add(fall);
myChart.getData().add(winter);
myChart.setAnimated(true);
}
}
DataModel.java
import java.util.List;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.concurrent.atomic.DoubleAccumulator;
public class DataModel {
private String quarter;
private String language;
private Integer count;
public DataModel(String quarter, String language, int count) {
this.quarter = quarter;
this.language = language;
this.count = count;
}
//A constructor that takes in a complete line from the csv file
public DataModel(String s){
//Winter,Python,42
Pattern commaPattern = Pattern.compile(",");
List<String> data = commaPattern.splitAsStream(s).collect(Collectors.toList());
this.quarter = data.get(0);
this.language = data.get(1);
this.count = Integer.parseInt(data.get(2));
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public String getQuarter() {
return quarter;
}
public void setQuarter(String quarter) {
this.quarter = quarter;
}
public String getLanguage() {
return language;
}
public void setLanguage(String language) {
this.language = language;
}
}
Explanation / Answer
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
public class BarChartSample extends Application {
final static String austria = "Austria";
final static String brazil = "Brazil";
final static String france = "France";
final static String italy = "Italy";
final static String usa = "USA";
@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("Country");
yAxis.setLabel("Value");
XYChart.Series series1 = new XYChart.Series();
series1.setName("2003");
series1.getData().add(new XYChart.Data(austria, 25601.34));
series1.getData().add(new XYChart.Data(brazil, 20148.82));
series1.getData().add(new XYChart.Data(france, 10000));
series1.getData().add(new XYChart.Data(italy, 35407.15));
series1.getData().add(new XYChart.Data(usa, 12000));
XYChart.Series series2 = new XYChart.Series();
series2.setName("2004");
series2.getData().add(new XYChart.Data(austria, 57401.85));
series2.getData().add(new XYChart.Data(brazil, 41941.19));
series2.getData().add(new XYChart.Data(france, 45263.37));
series2.getData().add(new XYChart.Data(italy, 117320.16));
series2.getData().add(new XYChart.Data(usa, 14845.27));
XYChart.Series series3 = new XYChart.Series();
series3.setName("2005");
series3.getData().add(new XYChart.Data(austria, 45000.65));
series3.getData().add(new XYChart.Data(brazil, 44835.76));
series3.getData().add(new XYChart.Data(france, 18722.18));
series3.getData().add(new XYChart.Data(italy, 17557.31));
series3.getData().add(new XYChart.Data(usa, 92633.68));
Scene scene = new Scene(bc,800,600);
bc.getData().addAll(series1, series2, series3);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
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