Umbra

Umbra is a library for drawing basic gradient shadows in typst. It currently provides only one function for drawing a shadow along one edge of a path.

Examples

Basic Shadow

Neumorphism

Torn Paper

Click on the example image to jump to the code.

Usage

The following code creates a very basic square shadow:

#import "@preview/umbra:0.1.1": shadow-path

#shadow-path((10%, 10%), (10%, 90%), (90%, 90%), (90%, 10%), closed: true)

The function syntax is similar to the normal path syntax. The following arguments were added:

• shadow-radius (default 0.5cm): The shadow size in the direction normal to the edge
• shadow-stops (default (gray, white)): The colours to be used in the shadow, passed directly to gradient
• correction (default 5deg): A small correction factor to be added to round shadows at corners. Otherwise, there will be a small gap between the two shadows

Vertex Order

The order of the vertices defines the direction of the shadow. If the shadow is the wrong way around, just reverse the vertices.

Transparency

This package is designed in such a way that it should support transparency in the gradients (i.e. corners define shadows using a path which approximates the arc, instead of an entire circle). However, typst doesn't currently support transparency in gradients. (issue).

In addition, the aforementioned correction factor would likely cause issues with transparent gradients.