Charts in Java

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You can change the color of the symbols for a series by setting the fill variable of the object, and you can use different symbols by installing a symbol creator function for a series or for the whole chartYou can also set the plot symbol for an individual data point by setting the symbol variable of its ScatterChartData object The code extract below, from the file javafxcharts/ScatterChart2fx, changes the fill color of the first data series to blue and uses a smaller circle to represent its data point Figure 26-12 shows the result
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ScatterChartSeries var series1 = ScatterChartSeries { name: "Series 1" data: for (x in [120]) { ScatterChartData { xValue: 20 + 10 * (Mathrandom() - 05) yValue: 20 + 10 * (Mathrandom() - 05) } } fill: ColorBLUE symbolCreator: function(series:ScatterChartSeries, seriesIndex:Integer, data:ScatterChartData, dataIndex:Integer, fill:Paint) { PlotSymbolCircle { size: 4 fill: fill }; } };
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Figure 26-12
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A ScatterChart with customized symbols
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Bubble Charts
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Like a ScatterChart, a BubbleChart is intended to show the correlation between data points in a seriesThe data points in a BubbleChart have an additional variable that lets you specify the radius of the plot symbol that represents itYou can use this feature to
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Bubble Charts
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apply some kind of visual weighting to the data pointThe code in Listing 26-9 creates two BubbleChartSeries in which the data points are randomly placed as they were in the ScatterChart example; each data point has a radius that is randomly chosen to be in the range 1 to 7
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Listing 26-9
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
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A BubbleChart
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var series1 = BubbleChartSeries { name: "Series 1" data: for (x in [120]) { BubbleChartData { xValue: yValue: radius: } }; var series2 = BubbleChartSeries { name: "Series 2" data: for (x in [120]) { BubbleChartData { xValue: yValue: radius: } };
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20 + 20 * (Mathrandom() - 05) 20 + 20 * (Mathrandom() - 05) 1 + 5 * Mathrandom() }
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40 + 20 * (Mathrandom() - 05) 40 + 20 * (Mathrandom() - 05) 1 + 5 * Mathrandom() }
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Stage { title: "Bubble Chart #1" scene: Scene { content: [ BubbleChart { data: [ series1, series2 ] xAxis: NumberAxis { upperBound: 60 tickUnit: 10 } yAxis: NumberAxis { upperBound: 60 tickUnit: 10 } } ] } }
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If you run this code, which you ll find in the file javafxcharts/BubbleChart1fx, you ll get a result that looks something like Figure 26-13 You can use the same mechanisms that you saw used with ScatterChart and LineChart to customize the plot symbol for any data point, for a series, or for the whole graph
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26 Charts
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Figure 26-13
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An example of a BubbleChart
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Chart Interaction
You can allow the user to interact with your chart by installing a function in the action variable of any Data objectThis function will be called whenever the user clicks on the part of the chart that corresponds to that objectThe following code adds an action function to the data point for the Duration category of the Apollo 11 series of data for the bar chart that we used as an example earlier in this chapter:
BarChartSeries { name: "Apollo 11" data: [ BarChartData { category: "Duration" value: 1955 action: function() { println("Clicked") } } BarChartData { category: "EVA Time" value: 25 } BarChartData { category: "Samples (kg)" value: 22 } ] }
If you run this example, which you ll find in the file javafxcharts/BarChart5fx, and move the mouse over one of the bars in the duration part of the chart, you ll notice that a black outline appears around the barThis outline appears when the mouse hovers over a part of any chart that is created from a Data object that has an action function Its color and width are determined by the hoverStroke and hoverStrokeWidth variables inherited from the Chart class:
BarChart { title: "Apollo Lunar Landings"