qr code java application Adding pie and bar charts in Java

Maker QR-Code in Java Adding pie and bar charts

Adding pie and bar charts
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For every Dilbert, there s a Pointy-Haired Boss, or so it seems. As programmers interested in graphics, we naturally want to spend our time writing video effects, UI controls, and Pac-Man clones; unfortunately, our bosses are unlikely to let us. When bosses say graphics they generally mean charts and graphs, and that s probably why the 1.2 release of JavaFX came with a collection of ready-made pie, bar, line, and other chart controls (like the 3D pie chart in figure 7.7).
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Chart topping: Feedback, version 2
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JavaFX has a powerful library of chart controls, including a 3D pie chart.
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The next update of the feedback application will take the region and rating data collected from each user (and stored using the new persistent Record class) and produce a pie chart and a bar graph from it. The first part of the new Feedback class is shown in listing 7.7. The code continues in listings 7.8 and 7.9.
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Listing 7.7 Feedback.fx (version 2, part 1)
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package jfxia.chapter7; import import import import import import import import import import import import import import import import import import import import import javafx.scene.Group; javafx.scene.Node; javafx.scene.Scene; javafx.scene.chart.BarChart; javafx.scene.chart.BarChart3D; javafx.scene.chart.PieChart; javafx.scene.chart.PieChart3D; javafx.scene.chart.part.CategoryAxis; javafx.scene.chart.part.NumberAxis; javafx.scene.control.Button; javafx.scene.control.Label; javafx.scene.control.RadioButton; javafx.scene.control.Slider; javafx.scene.control.TextBox; javafx.scene.control.ToggleGroup; javafx.scene.layout.Panel; javafx.scene.layout.Tile; javafx.scene.layout.VBox; javafx.scene.paint.Color; javafx.scene.shape.Rectangle; javafx.stage.Alert;
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Controls, charts, and storage
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import javafx.stage.Stage; import javafx.util.Sequences; var recordStore = Record.load(); def record:Record = Record {}; insert record into recordStore; def def var var winW:Number = 550; winH:Number = 350; showCharts:Boolean = false; showPie:Boolean = false;
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Show form or charts Show pie
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or bar def nextButton = Button { text: "Next"; action: function() { if(not showCharts) { If form showing if(record.valid) { delete mainPan.content[0];
Record.save(recordStore); insert createChartUI() before mainPan.content[0]; showCharts=true;
Remove form from scene graph Save form data Insert charts into scene graph Form invalid
} else { Alert.confirm("Error","Form incomplete."); } } else { showPie = not showPie; }
Toggle between charts
} } // Part 2 is listing 7.8; part 3, listing 7.9
This listing focuses on the introduction of the record store and the changes to the Next button. The recordStore variable is a sequence of Record objects, one of each feedback entry recorded in the application s persistent storage. Having loaded past records, we append the virgin record created as a model for our feedback UI. After the user completes the feedback form, clicking the Next button will record the data and take the user to the charts. Subsequent clicks of the Next button toggle between the Regions pie chart and the Ratings bar chart. Therefore, the nextButton control needs to be aware of whether it s moving from the form to the charts or toggling between the two charts. The showCharts and showPie variables are used for that very purpose. Within the nextButton action handler the code first checks, courtesy of showCharts, which mode the UI is currently in (form or charts). If the form is currently displayed, the form UI is deleted from the scene graph, the Record sequence is saved to persistent storage (including the Record just populated by the form), and the chart UI is created and added to the scene graph. Finally showCharts is set to mark the switch from form to charts. If nextButton is clicked when showCharts is already set, the showPie variable is toggled, causing a different chart to be displayed.
Chart topping: Feedback, version 2
Listing 7.7 contains all the necessary updates to the application, except the crucial step of creating the charts themselves. To find out how that s done, we need to consult listing 7.8, which holds the first part of the createChartUI() function. Because large parts of the class are unchanged, I ve replaced the details with comments in bold.
Listing 7.8 Feedback.fx (version 2, part 2)
// Part 1 is listing 7.7 var mainPan:Panel; Stage { // Stage details unchanged from previous // version } function createFeedbackUI() : Node { // createFeedbackUI() details unchanged from // previous version } function createRow(lab:String,n:Node,v:Node) : Node { // createRow() details unchanged from previous // version } function createChartUI() : Node { def regionData:PieChart.Data[] = for(r in Record.REGIONS) { var regIdx:Integer = indexof r; var cnt:Integer = 0; for(rc in recordStore) { if(rc.region == regIdx) cnt++; } PieChart.Data { label: r; value: cnt; } } var highestCnt:Integer = 0; def ratingData:BarChart.Data[] = for(i in [1..10]) { var cnt:Integer = 0; for(rec in recordStore) { def rat = rec.rating as Integer; if(rat == i) cnt++; } if(cnt>highestCnt) highestCnt=cnt; BarChart.Data { category: "{i}"; value: cnt; } }
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