XChart 介绍
XChart 是简单的图表应用。
特性：
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No additional dependencies
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~100KB Jar
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Line charts
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Scatter charts
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Area charts
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Bar charts
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Histogram charts
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Error bars
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Logarithmic axes
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Date and category X-Axis
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Multiple series
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Extensive customization
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Themes - XChart, GGPlot2, MATLAB
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Right-click, Save-As…
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user-defined axes range
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Custom legend placement
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CSV import and export
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High resolution chart export
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Real-time charts
示例：
double[] xData = new double[] { 0.0, 1.0, 2.0 };
double[] yData = new double[] { 2.0, 1.0, 0.0 };
// Create Chart
Chart chart = QuickChart.getChart("Sample Chart", "X", "Y", "y(x)", xData, yData);
// Show it
new SwingWrapper(chart).displayChart();
// Save it
BitmapEncoder.saveBitmap(chart, "./Sample_Chart", Bitmapformat.PNG);
// or save it in high-res
BitmapEncoder.saveBitmapWithDPI(chart, "./Sample_Chart_300_DPI", Bitmapformat.PNG, 300);