Implement initial XY time series builder framework

.gitignore

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-*.class
-
-# Log file
-*.log
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-# BlueJ files
-*.ctxt
-
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
-
-# Package Files #
-*.jar
-*.war
-*.nar
-*.ear
-*.zip
-*.tar.gz
-*.rar
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+.mvn/
+.settings/
+/bin/
+/target/
+/workspace/
+.classpath
+.project

LICENSE

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+jfreechart-builder: a builder pattern module for working with the jfreechart library
+
+(C) Copyright 2020, by Matt E.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

README.md

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 # jfreechart-builder
-An opinionated builder framework for effortlessly generating JFreeChart instances.
+
+A [builder pattern](https://en.wikipedia.org/wiki/Builder_pattern) module for working with the [jfreechart](https://github.com/jfree/jfreechart) library. Meant as a companion to [ChartFactory.java](https://github.com/jfree/jfreechart/blob/master/src/main/java/org/jfree/chart/ChartFactory.java) to build more complex charts with fewer lines of code.
+
+Takes an opinionated approach to creating "good enough" charts while providing a more declarative way of parameterizing them.
+
+Code like this:
+
+```
+public static final Stroke SOLID =
+    new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND);
+
+private static final Color DARK_GREEN = new Color(0, 150, 0);
+
+ChartBuilder.instance()
+
+    .title("Multi Plot Minute Time Series")
+
+    .timeData(timestampsArray)
+
+    .xyPlot(XYPlotBuilder.instance().yAxisName("Values")
+        .series(XYTimeSeriesBuilder.instance().data(array1).color(Color.BLUE).style(SOLID))
+        .series(XYTimeSeriesBuilder.instance().data(array2).color(Color.RED).style(SOLID))
+        .series(XYTimeSeriesBuilder.instance().data(array3).color(DARK_GREEN).style(SOLID))
+        .series(XYTimeSeriesBuilder.instance().data(array4).color(Color.MAGENTA).style(SOLID)))
+
+    .xyPlot(XYPlotBuilder.instance().yAxisName("Amplitudes")
+        .series(XYTimeSeriesBuilder.instance().data(array2).color(Color.GRAY).style(SOLID))
+        .series(XYTimeSeriesBuilder.instance().data(array3).color(Color.LIGHT_GRAY).style(SOLID)))
+
+    .xyPlot(XYPlotBuilder.instance().yAxisName("Series 1")
+        .series(XYTimeSeriesBuilder.instance().data(array1).color(Color.BLUE).style(SOLID)))
+
+    .xyPlot(XYPlotBuilder.instance().yAxisName("Series 2")
+        .series(XYTimeSeriesBuilder.instance().data(array2).color(Color.RED).style(SOLID)))
+
+    .xyPlot(XYPlotBuilder.instance().yAxisName("Series 3")
+        .series(XYTimeSeriesBuilder.instance().data(array3).color(DARK_GREEN).style(SOLID)))
+
+.build()
+```
+
+Produces a chart like this:
+
+![A multi-plot minute time series chart](./screenshots/multi-plot-minute-time-series.png "Screenshot")
+
+And code like this:
+
+```
+ChartBuilder.instance()
+
+    .title("Stock Chart Time Series With Weekend Gaps")
+
+    .timeData(timestampsArray) // Has weekend date timestamps missing
+
+    .xyPlot(OhlcPlotBuilder.instance().yAxisName("Price").plotWeight(3)
+        .series(OhlcSeriesBuilder.instance().ohlcv(ohlcv).upColor(Color.WHITE).downColor(Color.RED))
+        .series(XYTimeSeriesBuilder.instance().name("MA(20)").data(sma20).color(Color.MAGENTA).style(SOLID))
+        .series(XYTimeSeriesBuilder.instance().name("MA(50)").data(sma50).color(Color.BLUE).style(SOLID))
+        .series(XYTimeSeriesBuilder.instance().name("MA(200)").data(sma200).color(Color.RED).style(SOLID)))
+
+    .xyPlot(VolumeXYPlotBuilder.instance().yAxisName("Volume")
+        .series(VolumeXYTimeSeriesBuilder.instance().ohlcv(ohlcv).closeUpSeries().color(Color.WHITE))
+        .series(VolumeXYTimeSeriesBuilder.instance().ohlcv(ohlcv).closeDownSeries().color(Color.RED))
+        .series(XYTimeSeriesBuilder.instance().name("MA(90)").data(volSma90).color(Color.BLUE).style(SOLID)))
+
+    .xyPlot(XYPlotBuilder.instance().yAxisName("Stoch").yAxisRange(0.0, 100.0).yAxisTickSize(50.0)
+        .series(XYTimeSeriesBuilder.instance().name("K(" + K + ")").data(stochK).color(Color.RED).style(SOLID))
+        .series(XYTimeSeriesBuilder.instance().name("D(" + D + ")").data(stochD).color(Color.BLUE).style(SOLID))
+        .line(LineBuilder.instance().orientation(Orientation.HORIZONTAL).atValue(80.0).color(Color.BLACK).style(SOLID))
+        .line(LineBuilder.instance().orientation(Orientation.HORIZONTAL).atValue(50.0).color(Color.BLUE).style(SOLID))
+        .line(LineBuilder.instance().orientation(Orientation.HORIZONTAL).atValue(20.0).color(Color.BLACK).style(SOLID)))
+
+    .build()
+```
+
+Produces a chart like this:
+
+![A stock chart time series chart with weekend gaps](./screenshots/stock-chart-time-series-weekend-gaps.png "Screenshot")
+
+
+## Demo App
+
+See the [jfreechart-builder-demo](https://github.com/matoos32/jfreechart-builder-demo) for an interactive demo used for development.
+
+## Scope
+
+Currently only supports XY time series plots and uses a [CombinedDomainXYPlot](https://github.com/jfree/jfreechart/blob/master/src/main/java/org/jfree/chart/plot/CombinedDomainXYPlot.java) in all cases. This produces left-to-right horizontal time axes and vertical value axes. The time axis is meant to be shared by all sub-plots. If you need different time axes then you'll need to `build()` multiple charts and lay those out as desired in your app.
+
+Currently also only supports lines, stock market OHLC candlestick charts, and stock market volume bar charts.
+
+In the future, more parameterization may be added like specifying background and axis colors, or even the actual series renderer objects themselves to fully leverage what [jfreechart](https://github.com/jfree/jfreechart) provides.
+
+
+## Thread-safety and garbage collection
+
+No thread-safety measures are deliberately taken. If you require thread-safety then either provide deep copies of parameter objects or or synchronize access to builders and data vs. what your app is doing.
+
+Generally, primitive data arrays are copied into **jfreechart** objects. **jfreechart-builder** will maintain references to other objects passed-in like strings, colors, and drawing strokes. When the builders and charts they produce go out of scope,
+the objects you provided (and other objects that may be referencing them) should be garbage collected as applicable.
+
+
+## Versioning
+
+The major and minor numbers are the same as the **jfreechart** major and minor used. This is to indicate general compatibility. The incremental ("patch") number is the version of this module.
+
+
+## License
+
+**jfreechart-builder** is not affiliated with the **jfreechart** project but for compatibility is provided under the terms of the same [LGPL 2.1 license](./license-LGPL.txt).
+
+You should be aware of the contents of the **jfreechart-builder** JAR file built form this project.
+
+It's understood it will contain the compiled `.class` files of only **jfreechart-builder** and should not incorporate any from **jfreechart**, however you must verify its contents to know what your build tools are actually producing.
+
+If you need clarification on the LGPL vs. Java, please see the [FSF's tech note about it](https://www.gnu.org/licenses/lgpl-java.html).
+
+
+## Incorporating into your project
+
+### Building Prerequisites
+
+* JDK 8 or greater [[1](https://openjdk.java.net/)] [[2](https://www.oracle.com/java/)] installed.
+* [Apache Maven](https://maven.apache.org/) installed.
+* Internet connection so Maven can download artifacts or you provide and install those into your local Maven repo by alternative means.
+
+### Installing source code
+
+`git clone` this repo locally.
+
+
+### Building and installing the JAR
+
+```
+cd path/to/the/cloned/repo
+```
+
+Next, use `git` to checkout the desired branch or tag.
+
+If you want to simply build the jar and figure out what to do with it next ...
+
+```
+mvn package
+```
+
+The jar will be in the `target/` folder.
+
+
+If you want to build and install the jar into your Maven repo:
+
+```
+mvn install
+```
+
+
+### Including the dependency in a client project
+
+Add this dependency to your project's `.pom` file:
+
+```
+<dependency>
+  <groupId>com.jfcbuilder</groupId>
+  <artifactId>jfreechart-builder</artifactId>
+  <version>1.5.0</version>
+<dependency>
+```
+
+
+## Contributing
+
+Contributions are welcome. The project maintainers' time permitting, merge/pull requests will be reviewed. If accepted they will be merged. No guarantees are made that requests will be reviewed or merged.