A Typical Pie Chart in Java

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A Typical Pie Chart
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{ { { { { { { label: label: label: label: label: label: label: "Apollo "Apollo "Apollo "Apollo "Apollo "Apollo "Apollo 11" 12" 13" 14" 15" 16" 17" value: value: value: value: value: value: value: 22 } 344 } 0 } 430 } 768 } 947 } 1105 }
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var data = [ PieChartData PieChartData PieChartData PieChartData PieChartData PieChartData PieChartData
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]; Stage { title: "Pie Chart #1" scene: Scene { content: [ PieChart { title: "Weight of Lunar Samples by Flight (kg)" data: data } ] } }
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For each data point, we specify the value and the label to be used when displaying it The result of running this example is shown in Figure 26-3
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Figure 26-3
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A pie chart
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As you can see, each data point is represented by a proportionately sized slice of the whole pieThe name and the value supplied in the PieChartData object are used to construct a label that appears outside the circle and is connected to it by two straight-line segments, while the corresponding percentage value is shown in the arc itselfThe fill color for each slice is taken from a default palette of eight colors; if there are more than eight slices, the colors repeat Changing the color for a slice is one of the many customizations that the PieChart class allows and which we cover in the next section Because pie charts do not display multiple series of data, there is no need for a legend, and none is shown
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The radius of the pie is set automatically from the width of the area allocated to the chart If, in this example, you were to bind its width to that of the scene and then resize the scene, you would see that the pie chart would increase and decrease in size accordingly
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The PieChart class produces a flat representation of its data If you d like a more threedimensional chart, you can use the PieChart3D class instead PieChart3D is a subclass of PieChart that uses the same data objects and adds an additional variable that lets you configure the thickness of the pieTo convert a flat pie into a three-dimensional pie, just change the class name and assign a value to the pieThickness variable, as shown in the following code from the file javafxcharts/PieChart2fx, which gives the result shown in Figure 26-4
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Stage { title: "Pie Chart #2" scene: Scene { content: [ PieChart3D { title: "Weight of Lunar Samples by Flight (kg)" data: data pieThickness: 32 } ] } }
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Figure 26-4
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Customizing a Pie Chart
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There are many ways to change the appearance of a pie chart Some of the available customizations apply to the whole chart and are controlled by variables in the PieChart class, while others are specific to a slice and are specified in the PieChartData object for that sliceAn example of a customized pie chart is shown in Figure 26-5, and the code that created it, which you ll find in the file javafxcharts/PieChart3fx, is shown in Listing 26-2
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Figure 26-5
A customized pie chart
Listing 26-2
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A Pie Chart with Customizations Applied
{ { { { { 22 } 344 } 0 } 430 } 768 947 } 1105 }
var data = [ PieChartData PieChartData PieChartData PieChartData PieChartData
label: "Apollo 11" value: label: "Apollo 12" value: label: "Apollo 13" value: label: "Apollo 14" value: label: "Apollo 15" value: fill: ColorCHOCOLATE } PieChartData { label: "Apollo 16" value: PieChartData { label: "Apollo 17" value:
]; Stage { title: "Pie Chart #3" var scene:Scene; scene: scene = Scene {
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width: 500 height: 400 content: [ PieChart { width: bind scenewidth height: bind sceneheight title: "Weight of Lunar Samples by Flight (kg)" data: data pieToLabelLineCurved: true startAngle: 90 clockwise: false pieStroke: ColorBLACK pieValueLabelFormater: function(value:Number, percent:Number):String { "{value} kg" } } ] } }
This example applies one customization to a particular slice and five customizations to the chart itself The slice customization changes the fill color of the slice with label Apollo 15 to ColorCHOCOLATE by setting the fill variable of its PieChartData value on lines 6 and 7 Other variables in this class can be used to change the stroke color, which is used to draw the outline of the slice and the stroke widthYou can also set the explodeFactor variable to make the slice appear larger than its neighbors2 On lines 25 and 26, we set the values of the startAngle and clockwise variables of the PieChart class to 90 and false, respectively If you compare Figure 26-5 with Figure 26-3, you see that the slice that represents the first data item, which has the label Apollo 11, has moved from the 3 o clock position to the 12 o clock position, as a result of the change in the value of the startAngle variableYou can also see that the order in which the slices are drawn has been reversed, because the clockwise variable has been changed from its default value of true to false Setting the value of the pieStroke variable on line 27 changes the color used to draw the outlines of the pie slices from white to blackThis variable applies to all the slices, but can be overridden by the stroke variable in the PieChartData object for any given sliceThere is also a variable called pieStrokeWidth that sets the width of the slice outline By default, the graphic that connects a pie slice to the label that appears outside of the chart (which is referred to as the pie label) consists of two straight linesThere are several variables in the PieChart class that let you control the appearance of this graphic On