如何在ggplot2中创建带阴影的直方图？Base R已实现但ggplot2遇阻

Great question—using patterned fills instead of solid colors is such a smart call for grayscale printing or when color isn’t feasible. Base R’s hist() makes this straightforward with density and angle parameters, but ggplot2’s default geom_histogram() doesn’t have built-in support for this. Luckily, there’s a clean solution using the ggpattern package, which adds pattern-based fill options to ggplot2 geoms.

Step 1: Install and Load the ggpattern Package #

First, install the package if you haven’t already:

install.packages("ggpattern")

Then load it alongside ggplot2:

library(ggplot2)
library(ggpattern)

Step 2: Build the Hatched Histogram #

Replace geom_histogram() with geom_histogram_pattern(), and use parameters that mirror your base R setup:

• pattern: Pick the pattern type (use "stripe" to match base R’s angled shadow lines)
• pattern_density: Controls how tightly packed the pattern lines are (matches base R’s density argument)
• pattern_angle: Sets the rotation of the pattern lines (matches base R’s angle argument)
• pattern_fill: Color of the pattern lines
• fill: Background fill of the bars (set to "white" if you only want the pattern, no solid color)

Here’s the full code that replicates your base R example:

library(ggplot2)
library(ggpattern)

ggplot(diamonds, aes(carat)) +
  geom_histogram_pattern(
    pattern = "stripe",
    pattern_density = 25,
    pattern_angle = 60,
    pattern_fill = "black",
    fill = "white",
    color = "black" # Optional: adds bar borders like base R's default
  ) +
  theme_bw()

Bonus: Customize the Pattern #

You can tweak the look further by trying other patterns like "crosshatch" (intersecting lines), "dot", or "wave". Adjust pattern_density to make lines more/less sparse, or pattern_angle to rotate them to your preferred orientation.

Alternative Without Extra Packages (Advanced) #

If you’d rather avoid installing a new package, you could manually draw pattern lines with geom_segment(), but this requires calculating bar positions and heights first—it’s far less efficient than using ggpattern. For most use cases, ggpattern is the simplest, most maintainable solution.

内容的提问来源于stack exchange，提问作者Christoph