Area Charts in Java

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Area Charts
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An area chart is a variant of the line chart in which the area between the graphed line and the horizontal axis is filled with colorThe data for an area chart is provided by one
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or more AreaChartSeries populated with AreaChartData objects Listing 26-7 shows an area chart with the same data as that shown in the line charts in the previous section The result of running this code, which is in the file javafxchart/AreaChart1fx, is shown in Figure 26-10
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Listing 26-7
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An AreaChart
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var lineSeries1 = AreaChartSeries { name: "Line 1" data: for (x in [-5050 step 10]) { AreaChartData { xValue: x yValue: 2 * x } } }; var lineSeries2 = AreaChartSeries { name: "Line 2" data: for (x in [-5050 step 10]) { AreaChartData { xValue: x yValue: 30 } } }; Stage { title: "Area Chart #1" scene: Scene { content: [ AreaChart { data: [ lineSeries1, lineSeries2 ] xAxis: NumberAxis { upperBound: 50 lowerBound: -50 tickUnit: 10 } yAxis: NumberAxis { upperBound: 100 lowerBound: -100 tickUnit: 10 } } ] } }
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The colors used to fill each chart area, which is obtained from the fill variable of its object, are partly opaque so that you can see both areas in the region where they overlap By default, the colors are drawn with an opacity of 05, but this can be changed by changing the value of the dataOpacity variable of the AreaChart object
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26 Charts
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Figure 26-10
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An AreaChart with two filled areas
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Scatter Charts
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Scatter charts are used to show correlation (or lack of correlation) between data points by plotting just the points themselves Closely related data points should be easy to see because they will appear to be close together in the chartThe data model for a scatter chart is the same as that for a line chart, except that the class names are ScatterChartData and ScatterChartSeries The code in Listing 26-8 creates two series of data, each of which contains 20 points that are randomly distributed around a particular center point Proximity of the points in each series is guaranteed by the expressions used to set the xValue and yValue variables, both of which add a random offset in the range 10 to +10 (exclusive) to the coordinates of the center point If you run this example, which you ll find in the file javafxcharts/ScatterChart1fx, you ll get the result shown in Figure 26-11
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Listing 26-8
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var series1 = ScatterChartSeries { name: "Series 1" data: for (x in [120]) { ScatterChartData { xValue: 20 + 10 * (Mathrandom() yValue: 20 + 10 * (Mathrandom() } }; var series2 = ScatterChartSeries { name: "Series 2" data: for (x in [120]) { ScatterChartData { xValue: 40 + 10 * (Mathrandom() -
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05) 05) }
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05)
Scatter Charts
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yValue: 40 + 10 * (Mathrandom() } }; Stage { title: "Scatter Chart #1" scene: Scene { content: [ ScatterChart { data: [ series1, series2 ] xAxis: NumberAxis { upperBound: 60 tickUnit: 10 } yAxis: NumberAxis { upperBound: 60 tickUnit: 10 } } ] } }
05) }
Figure 26-11
A ScatterChart with two data series
You can see clearly that the data points in each series are closely related to each other and unrelated to those in the other series, because their symbols for each series are tightly bunched together