Generalize position_jitterdodge to all possible dodge positions

[bleutner]

So far, position_jitterdodge() is limited to boxplots dodged by the fill aesthetic.
This pull request generalizes the function to work properly on all posible dodge aesthetics:

• fill
• colour
• linetype
• alpha
• size
• shape

not that all of these readily make sense to me, but as long as it is supported by boxplot etc. I think it would be good to have this functionality. I for one was trying based on colour dodging, when I came upon this.

library(ggplot2)
# Example data
data(diamonds)
dsub <- subset(diamonds, clarity %in% levels(clarity)[1:3] & color %in% levels(color)[1:2])   
dsub$test <- sample(c("a","b"), nrow(dsub), replace = TRUE) 

# Set-up ggplot
p <- ggplot(dsub) +
        geom_boxplot(outlier.colour = NA) +   
        geom_point(position = position_jitterdodge())

# So far we are limited to dodge by 'fill'
p %+% aes(x = cut, y = carat, fill = clarity) 

# Dodge by single aesthetic #####################
# Dodge by: colour
p %+% aes(x = cut, y = carat, colour = clarity)

# Dodge by: linetype          
p %+%  aes(x = cut, y = carat, linetype = clarity)

# Dodge by: alpha          
p %+%  aes(x = cut, y = carat, alpha = clarity)

# Dodge by: size          
p %+%  aes(x = cut, y = carat, size = clarity)

# Dodge by: shape          
p %+%  aes(x = cut, y = carat, shape = clarity)

# Dodge interactions ############################
# Dodge by: fill & colour , case fill == color    
p %+%  aes(x = cut, y = carat, fill = clarity, colour = clarity)

# Dodge by: fill & colour , case fill != color        
p %+% aes(x = cut, y = carat, fill = clarity, colour = color)

# Dodge by: fill & colour & linetype
p %+% aes(x = cut, y = carat, fill = clarity, linetype = color, color = test)

[hadley]

Can you please fix the indenting?

[hadley]

Looks good apart from a few style problems.

[bleutner]

I fixed all comments.

[hadley]

It would be more natural to break the line just before stop(), and I prefer to always put if statements in {}

[bleutner]

No problem. Like that?

[hadley]

Perfect - thanks!

[hadley]

Thanks!

[lock]

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