How to add legends

A how-to guide for adding legends to your solution.


Would you like to use colors to represent different categories or analysis results? Then add a colour legend to your solution by following these steps.


  • You configured the frames and routes for your solution.
  • You configured the relevant contents such as the model(s), control panel(s), viewer(s) and datastore.
  • You have a Rhino Grasshopper definition with your solution logic.

1. Configure the legend in VSCode

To add a legend to your solution, the legend should be configured in your solution.yaml file.

  • Create an entity with the kind: Legend.
  • Optionally specify the legend type.
    Categorical legends result in color swatches and can be used for color-coding geometries.
    Staggered legends result in adjacent colored blocks in relation to a scale and can be used for showing quantitative analysis results.
  • Optionally specify the legend colours.
  • Optionally define the labels for the colors.

❗ If you’re using a staggered legend, the number of labels should be 1 more than the number of colors.

The configuration should look similar to the example below:

  kind: Legend
  type: Categorical # Optional
  colours: # Optional
    - [0,0,255]
    - [0,255,0]
    - [255,0,0]
  labels: # Optional
    - my-label-1
    - my-label-2
    - my-label-3

💡 The legend colors and labels can also be defined in Rhino Grasshopper for dynamic results.

2. Optionally output legend data from Rhino Grasshopper

To create dynamic legends for your solution:

  • Add the Packhunt Colour Legend component to the Rhino Grasshopper canvas.
  • Specify the RGB color codes which should be displayed in the legend.
  • Define the legend type.
  • Define the values each color represents as “labels”.
  • Connect the Colour Legend component’s output to the Packhunt Data Output component.
  • Rename the Data Output component.

See the image below for an example Grasshopper definition.

To retrieve the legend labels and colours from your Grasshopper model:

  • Define a subscription from the legend to the model.
  • In the subscription, specify the target frame and model.
  • Specify which Grasshopper legend output to retrieve.

💡 If you’re retrieving the legend from your Grasshopper definition, you don’t need to configure the type, labels and colours in your solution.yaml file.

The configuration should look similar to the example below:

  kind: Legend
    - kind: Model
      frame: my-home-frame
      source: my-model
      legend: my-legend-output # must match GH model output

3. Add the legend to the layout

To display the legend in your solution, add it to the layout configuration. For instructions, see the how-to guide for customizing solution layouts.


The solution should look like the image below.


See the legendConfig schema docs and legendModelSubscription schema docs for more information.