Requirements

Overall Requirements

• Support popular browsers. This includes Chrome, FireFox, Edge, and Safari. IE 10 is still supported
• Provide support for popular GIS data formats through supported web mime types (e.g. GeoJSON for vector data, JPG for rasters)

Current Features

Below is a list of the existing features in features in CanvasMap:

• Scene:
  • Setting the background color
• View:
  • Setting the range of zoom levels and extent
• Layer types:
• Point layers:
• Standard marks (circle, squares, triangles, stars)
• Settable styles, can be different for each feature
• Icons from image files
• Settable images, can be different for each feature
• Data from:
• GeoJSON
• Client-side JavaScript
• Labels
  • Collision detection
• Clustering and/or collision detection
• Polyline and polygon layers:
• Stylize fills and strokes
• Settable for all or individual features
• Mouse over and selected styles
  • Settable for all or individual features
• Data from:
• GeoJSON
• Raster layers:    
• JPG, PNG
• OpenStreetMap tiles
• Pyramids of tiles
• Vector
• Raster
• All vector layers:
• Override: MouseDown, MouseMove, MouseUp, others?
• Info balloons based on attributes or custom content
• Search on attributes -> selection
• View attributes in a table (in development)
• Access to get and set attributes
• All layers:
• Zoom to bounds (if bounds available)
• Projections
  • Project on load
  • Convert projected coordinates to geographic for display
  • Add points using geographic coordinates to point layer
• Control of the style and layout from CSS where possible
  • Sizing the Canvas itself and inability to get the width and height from a CSS file limits this.
• GUI
  • Display of the current spatial reference
  • Informational popup windows with HTML content from attributes or set by JavaScript
  • Map Panels:
    • Title bar
    • Tool bar with select and pan tools
    • Footer with credits, coordinates, and spatial reference
    • Layers panel with access to:
      • Settings: fill and stroke style
      • Zoom to bounds
      • Delete
    • Background selections
    • Search panel
    • Easy to replace or remove standard map panels
  • Mouse for zoom in/out, pan, and mouse wheel for zooming
  • Maps that can flow with HTML content or be resizeable
  • Limit zoom levels and visible area
  • Change styles for map elements
  • Replace map elements with your own
• Map elements:
  • Scale bars
  • Coordinates
  • Legends
  • Graticules
  • North arrows that point north
• Create new layers and new map elements

3D Needs:

• Create, position, rotate various types of lights in 3 dimensional space
• Extrude vector layers

Current Extensions

Editor

The editor allows users to dynamically create maps, obtain the properties for the map or save them to a server, and then recreate the map from the properties at a later date.

 

Possible Extensions

• Raster histograms?
• Editable vector data: points, polylines, polygons (how to make persistent?)
• Label layers for polylines and polygons (create in BlueSpray?)
• Save "maps" to a server and then load them again (i.e. a big JSON object that includes the layer, scene and CanvasMap settings).

Planned Changes

Below is a list of the changes that are planned for Canvas map.

• Move the private functions into the constructors where possible