Consistent width for geom_bar in the event of missing data

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Some new options for position_dodge() and the new position_dodge2(), introduced in ggplot2 3.0.0 can help.

You can use preserve = "single" in position_dodge() to base the widths off a single element, so the widths of all bars will be the same.

ggplot(data = d, aes(x = Month, y = Quota, color = "Quota")) + 
     geom_line(size = 1) + 
     geom_col(data = d[c(-1:-5),], aes(y = Sepal.Width, fill = Species), 
              position = position_dodge(preserve = "single") ) + 
     scale_fill_manual(values = colours)

Using position_dodge2() changes the way things are centered, centering each set of bars at each x axis location. It has some padding built in, so use padding = 0 to remove.

ggplot(data = d, aes(x = Month, y = Quota, color = "Quota")) + 
     geom_line(size = 1) + 
     geom_col(data = d[c(-1:-5),], aes(y = Sepal.Width, fill = Species), 
              position = position_dodge2(preserve = "single", padding = 0) ) + 
     scale_fill_manual(values = colours)

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