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POadding a key for geom_line to legend from geom_area
 

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  1. POadding a key for geom_line to legend from geom_area
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    <p>I have a data frame, where I am talking about different flows of water at a dam (water units are kcfs—1000 cubic feet per second—if anyone is interested)</p> <p>Call it df4plot</p> <pre><code> date kcfs Flowtype 10/1/2010 50 Power 10/1/2010 10 Spill_Overgen 10/1/2010 8 Spill_Force 10/2/2010 52 Power 10/2/2010 7 Spill_Overgen 10/2/2010 10 Spill_Force </code></pre> <p>(there are 3x365 rows in the data frame)</p> <p>So what I want to do is make an aggregated area graph that shows each of these flows</p> <pre><code>p &lt;- ggplot(data = df4plot, aes(date,kcfs)) + geom_area(aes(colour = Flowtype, fill=Flowtype), position = “stack”) </code></pre> <p>I want to control the colors used, so I added </p> <pre><code>plot_colors_aggregate &lt;- c("forestgreen","lightsalmon","dodgerblue") p &lt;- p + scale_color_manual(values = plot_colors_aggregate) + scale_fill_manual(values = plot_colors_aggregate) </code></pre> <p>Now I want to add a dashed line, showing the maximum turbine capacity—the flow limits for power generation—that vary by month. I have a separate dataframe for this (365 rows long), df4FGline</p> <pre><code> Date FGlimit 10/1/2010 52 10/2/2010 52 … 11/1/2010 60 11/2/2010 60 ... Etc </code></pre> <p>So now I have </p> <pre><code>p &lt;- p + geom_line(data = df4FGline, aes(x=date,y=FGlimit), colour = “darkblue”, linetype = “dashed”) p </code></pre> <p>The legend is currently just the three blocks for the three types of Flowtype. I’d like to add the dashed line for the flow gate limits to the bottom, but I can’t get it to show up there.</p> <p>It is probably related to my incomplete understanding of aes (help(aes) is AMAZINGLY unhelpful). </p> <p>I’ve tried something similar to <a href="https://stackoverflow.com/questions/9915824/how-can-i-make-a-legend-in-ggplot2-with-one-point-entry-and-one-line-entry">this</a> and something similar to <a href="https://stackoverflow.com/questions/5027016/missing-legend-with-ggplot2-and-geom-line?rq=1">this</a>, but since I’m only trying to add 1 line to a pre-existing legend, maybe?, this is not working for me.</p> <p>I tried adding “legend = TRUE” inside the parentheses for the geom_line, but it put a dashed line inside each color box in the legend, AND created a 4th entry for the legend, but offset from the rest of the legend (below and to the right)... ARG!</p> <p>I swear I have the book on order... any help you can share so that I understand this aesthetic thing and how it relates to the legend a little better, I'd be extremely grateful.</p> <p><em>edited for typo</em></p>
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    1. USuser1156870
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      1. POadding a key for geom_line to legend from geom_area
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    1. COHere's a hint: ggplot will automatically create a legend if you _map_ an aesthetic (inside of `aes()`), but not if you _set_ an aesthetic.
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      1. USjoran
    2. COBut aren't both of my geoms doing this mapping thing, using aes()? Can you point me to anywhere I can read about this difference between _mapping_ and _setting_ I'd be grateful.
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    3. COLinetype is set outside of aes() in geom_line.
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      1. USjoran
 

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