show_global_legend_image

Show a global legend image for all visible layers

This scripts adds a new menu item called Legend which let the user open a small panel on the top-right corner of the map showing the image legend of the currently active layers.

The legend image is refreshed automatically when the user:

• Toggles the visibility of the map layers in the Layers panel
• zooms or pans the map:
  • the legend classes will be visible if the corresponding objects are visible in the map
  • the legend will change accordingly to the map scale
• and only if the legend panel is visible.

You can edit the JavaScript file to change the label of the tool: replace Legend by any other term for the constant MY_LEGEND_TITLE.