v0.11.7

Improvements

• Use Leaflet events to track pan/zoom (avoid jitter from rapid re-snapping during slow pan or zoom)
• interactive flag on points-nested text inherits from parent point (N.B.: matches Tangram ES behavior)
• Scene load event now fires after global property substitution
• Scene adds a new update event that is called (with same data as load) when scene is updated (scene.updateConfig() is called)
• Optimize redraw based on presence of other Leaflet map pane layers
• Avoid unnecessary re-render passes when feature selection requested #482
• Use hash function for key on GL shader and program caches
• General memory usage reductions
• Only reload fonts if any definitions have changed
• Perform bounds checking on requested point for feature selection
• Upgrade PBF, MVT parsing, and fontfaceobserver libraries

Bug Fixes

• Fix handling of URLs with absolute paths #477
• Fix pinch-zoom handling for Leaflet layers #476
• Don't allow Tangram tile zoom to go below zero
• Fix debug stats for tile and GL buffer usage

v0.11.6

Bug Fixes

• Don't read/write from the selection buffer while tiles are building ad936fb
  • Avoids extraneous null feature results for scene.getFeatureAt()

v0.11.5

Enhancements

• Reduce scroll-wheel zoom jank in Firefox and Edge/IE
  • Apply different throttling behavior to Chrome/Safari vs. FF/Edge/IE f211518
• Add a limit on ancestor proxy tile depth (currently 5 zoom levels) to prevent excessively scaled geometry da4dc32
• Optimize handling of 0px-size points/labels (assists in showing only the text portion when using a points-based style) 825c6d9 300d4cc
• Reduce selection buffer read delay to prevent resource contention in IE11 04c6666

Bug Fixes

• Prevent event subscribers from bubbling exceptions up to Tangram by wrapping in try/catch blocks c0daa42
  • Addresses Tangram Play issue where mis-handled shader error was breaking map updates.
• Prevent out-of-date GL objects from being used with new context #470
  • Namespace GL shader and program objects by GL context id 00d0f15
• Prevent extraneous / visually distracting snap-to-pixel-grid animations when calling scene.updateConfig()
  • When responding to Tangram view changes, only update the Leaflet view if it differs 9165261
• Prevent redundant material shader injection 43e542c
  • Was reducing effectiveness of GL program/shader object caching
• When scene.rebuild() request is queued (due to throttling), save options and passthrough to queue (previously these options were being ignored) 2f68fbf
• Handle missing Math.log2 support in IE11 #473 #474

v0.11.4

Enhancements

• Improved text clarity for diagonal labels
  • Achieved by rendering these labels at 150% size for higher quality sampling on rotation #467
• Improved performance on Edge/IE11 by enabling cancellation of pending tile network requests
  • These requests are proxied from worker to main thread, so the cancellation request must be proxied as well

Bug Fixes

• Support MVT data source tile extents of arbitrary scale (was previously hardcoded to assume 4096 extent)

v0.11.3

Bug Fixes

• Fix handling of layer filter properties for the full range of valid characters #466
  • Previously only worked for properties compatible with JS dot notation access, e.g. excluding characters such as colons or other special characters
• Fix initialization of data sources added at run-time (with scene.setDataSource()) #452
• Fix cancellation of tile requests
  • Works in Chrome & Safari, does not work in FF due to issue w/XHRs made from worker threads; will address in future release

Internal

• Moves the filter matching module from an external module (was match-feature) into the main repository

v0.11.2

Bug Fixes

• Fix regression causing rendering to fail in Safari (due to ambiguously valid GL shader objects) #463
• Don't create labels for empty text strings #447

v0.11.1

Enhancements

• Improve text clarity by aligning sprites to pixel grid #458
  • Results in significantly better text clarity, especially for non-retina displays, small font sizes, and non-Latin scripts #453
• Improve shader initialization performance:
  • Lazily compile shader programs on the first render pass they are used #450
  • Cache and reuse GL program and shader objects with identical source code #460
• Prevent non-tiled data sources from being loaded more than once (by pinning all tiles from each to a single worker - previously was loaded one per worker) 7a4c479
• Allow global properties to be used for texture values #449

Bug Fixes

• Fix intermittent Edge/IE11 initialization failures (worker threads hang) #448
• Fix alpha compositing for blend: overlay #455
• Fix wayward points placed off of lines when using placement: spaced 6cf42c2
• Detect duplicate line vertices in more cases #459
• Resize map on first page visibility event, fixes intermittent cases where map would not draw when spawned in new tab a797d03 c08e191
• Fix occasional missing style errors, such as while loading a new scene 9d58680
• Remove warning in tile build on missing data source 1e59bdc
• Make application of feature selection to styles consistent with Tangram ES c604fc8
• Fix Chrome GL attribute warning when rendering feature selection pass 0eb31cb

v0.11.0

Enhancements

• 10% reduction in minified + gzipped bundle size
• 25% faster label collision, as measured on a complex label scene (Bubble Wrap central London at z17) #440
• New placement strategies for improved cartographic symbols including road shields and one-way street arrows #409 #441
  • placement parameter to specify how points-based styles should be applied to line or polygon features:
    • placement: vertex: place points at line/polygon ring vertices (default and previous library behavior)
    • placement: midpoint: places points at line/polygon ring segment midpoints (better for road shields, to avoid ambiguous intersections such as highway interchanges)
    • placement: spaced: places points along a line/polygon ring at fixed intervals, useful for symbols like one-way street arrows where consistent spacing is desirable
      • Spacing defined in pixels with placement_spacing parameter; defaults to 80px, also accepts zoom stops or JS functions
    • placement: centroid: places points at polygon outer ring centroid
      • Only applicable for polygons (supersedes previous centroid: true parameter)
  • Additional parameters for placement values of midpoint and spaced:
    • placement_min_length_ratio parameter specifies the minimum line segment length as a ratio to the point being placed
      • Can be used to tune the number of symbols such as road shields up (with lower values) or down (with higher values), and avoid undesirable cases where a point obscures the underlying line segment
      • placement_min_length_ratio defaults to 1, requiring line segment to be at least as long as the point itself
      • See #441 for more examples
    • tile_edges parameter indicates whether points should be placed along tile boundaries (usually undesirable)
      • Applies same logic as lines styles.
      • tile_edges defaults to false.
• Enable repeat behavior (repeat_distance and repeat_group parameters) for points-based styles
  • Separate repeat_distance values can apply to a points-based draw group with an attached text. The former, on the "parent" point, determines how often any object of that type may repeat, while the latter, on the "child" text, determines how often an object with that specific text may repeat.
    • Example: one may wish for road shields generally to appear within 80px of one another, while requiring that a specific shield for the same highway only repeat every 200px

      shields:
        repeat_distance: 80px # any given shield can appear within 80px of any other shield
        ...
        text:
          repeat_distance: 200px # shields with the same text must appear at least 200px apart

• Allow scene import values to be JS objects 654b29a
  • Allows for scene properties to be overridden at initial load time, without need to hook into Tangram events or update scene after load
  • Example of this pattern, setting English language preference and enabling transit overlay on Mapzen's Bubble Wrap style at load time:

    scene.load({
      import: [
        'https://mapzen.com/carto/bubble-wrap-style/5/bubble-wrap.yaml',
        { global: { ux_language: 'en', sdk_transit_overlay: true } }
      ]
    });

• Adds smoothly animated double-click zoom via Leaflet plugin 655ad75
  • Similar to default behavior of other popular vector map products
  • Can be disabled with modifyDoubleClickZoom: false on initialization of Tangram.leafletLayer
• Data source transform functions will now be invoked for non-tiled and MVT data sources #434
  • Previously, these functions were only applicable to tiled GeoJSON or TopoJSON sources
• Second argument of Scene.load() has been transitioned to a full options object (with backwards compatible support for specifying config_path string as the argument value) d392bb1

Bug Fixes

• On initial map load, do not block map rendering on loading/building of all tiles, e.g. tiles should "pop in" incrementally as they are finished building 92e4455
• Fix bounding boxes for labels with Italic fonts #431

Internal

• Remove use of ES6 features that
  • Are not transpiled efficiently (including for..of loops, generators)
  • Can reduce bundle size by avoiding polyfills (Set, Map)
• Upgrade to TopoJSON 2.x, and use slimmed down fork to only include methods used by Tangram.

v0.10.6

Enhancements

• Updated demo for Mapzen 1.0 vector tiles

Bug Fixes

• Fix invalid regular expression errors on some tiles, and compiled code is no longer backwards (!) #425, #426
• Only re-enable Leaflet scroll-wheel zoom if it was previously enabled #427
• Don't allow Leaflet scroll-wheel zoom to go past map max zoom

v0.10.5

Enhancements

• Upgrade demo to Leaflet 1.0.1

• Improved Leaflet/Tangram scrollwheel zoom interaction (see #423)

  • Tangram makes adjustments to Leaflet's default scrollwheel handling, for better animation synchronization with its own rendering. These modifications can be disabled with the modifyScrollWheel option:

  var layer = Tangram.leafletLayer({
    scene: ...,
    modifyScrollWheel: false
  });
  

• Allow the scene's base path to be set when the Leaflet layer is created, with the sceneBasePath option.

  • This is useful for developing or testing a local scene file referencing remote resources, such as in the case of Tangram Play.
  • Example, a local image image.png referenced in local.yaml will resolve to https://example.com/scene/image.png:

  var layer = Tangram.leafletLayer({
    scene: 'local.yaml',
    sceneBasePath: 'https://example.com/scene/'
  });
  

Internal

• Fix base style counts in scene.debug.geometryCountByBaseStyle() debug stats.