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Is there a good tutorial for Graphael (special line charts), I currently trying to implement such a graph with grafael http://www.highcharts.com/demo/?example=line-time-series&theme=default unfortunately there is no documentation.
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And while there are few hard-and-fast rules when it comes to data visualization, one thing is for certain: line charts are not suitable for comparing multiple categories at one point in time for a single variable.
High-low lines link the highest data point of all series in a category to the lowest data point of all series in a category. High-low lines are often used on stock charts to show the highest and lowest price of the stock.
You can use a line chart in Excel to display trends over time. In Excel, line charts are appropriate if you have text labels, dates, or a few numeric labels on the horizontal axis (x-axis).
A series is a set of data, for example a line graph or one set of columns. All data plotted on a chart comes from the series object.
A useful resource has been Kenny Shen's GitHub repository where he has begun writing up both documentation and examples for gRaphael.
https://github.com/qoelet/g.raphael
As an example check out the line chart documentation here
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The best example of a Raphael linechart must be this one: http://g.raphaeljs.com/linechart.html, from the source code you can get a lot of information on how they work and how they can be configured.
As far as I know there is no official documentation on this (yet?).
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