# coord_polar: Polar coordinates In hadley/ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics

## Description

The polar coordinate system is most commonly used for pie charts, which are a stacked bar chart in polar coordinates.

## Usage

 `1` ```coord_polar(theta = "x", start = 0, direction = 1, clip = "on") ```

## Arguments

 `theta` variable to map angle to (`x` or `y`) `start` offset of starting point from 12 o'clock in radians `direction` 1, clockwise; -1, anticlockwise `clip` Should drawing be clipped to the extent of the plot panel? A setting of `"on"` (the default) means yes, and a setting of `"off"` means no. For details, please see `coord_cartesian()`.

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45``` ```# NOTE: Use these plots with caution - polar coordinates has # major perceptual problems. The main point of these examples is # to demonstrate how these common plots can be described in the # grammar. Use with EXTREME caution. #' # A pie chart = stacked bar chart + polar coordinates pie <- ggplot(mtcars, aes(x = factor(1), fill = factor(cyl))) + geom_bar(width = 1) pie + coord_polar(theta = "y") # A coxcomb plot = bar chart + polar coordinates cxc <- ggplot(mtcars, aes(x = factor(cyl))) + geom_bar(width = 1, colour = "black") cxc + coord_polar() # A new type of plot? cxc + coord_polar(theta = "y") # The bullseye chart pie + coord_polar() # Hadley's favourite pie chart df <- data.frame( variable = c("does not resemble", "resembles"), value = c(20, 80) ) ggplot(df, aes(x = "", y = value, fill = variable)) + geom_col(width = 1) + scale_fill_manual(values = c("red", "yellow")) + coord_polar("y", start = pi / 3) + labs(title = "Pac man") # Windrose + doughnut plot if (require("ggplot2movies")) { movies\$rrating <- cut_interval(movies\$rating, length = 1) movies\$budgetq <- cut_number(movies\$budget, 4) doh <- ggplot(movies, aes(x = rrating, fill = budgetq)) # Wind rose doh + geom_bar(width = 1) + coord_polar() # Race track plot doh + geom_bar(width = 0.9, position = "fill") + coord_polar(theta = "y") } ```

hadley/ggplot2 documentation built on Jan. 20, 2019, 5:20 p.m.