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Who

Stamen is a design/technology company known for its data visualization and open work (e.g. Stamen Watercolor). SteveG consults for Stamen now and then on mobile and is known for another open source map toolkit (WhirlyGlobe-Maply) which made the transition to Metal years ago.

What

We're floating a proposal with some of Stamen's clients to upgrade MapLibre Native to:

• Open up the rendering subsystem in MapLibre Native
• Implement a Metal rendering module for iOS / MacOS

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struct VertexArgBufferA {
    const device Uniforms *uniforms               [[ id(WKSUniformArgBuffer) ]];
    const device UniformDrawStateA *uniDrawState  [[ id(WKSUniformDrawStateArgBuffer) ]];
};

// Vertex shader for simple line on the globe
vertex ProjVertexA vertexLineOnly_globe(
    VertexA vert [[stage_in]],
    const device VertexArgBufferA & vertArgs [[buffer(WKSVertexArgBuffer)]])
{

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<?xml version="1.0" encoding="UTF-8"?>
<StyledLayerDescriptor version="1.0.0" xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd" xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <NamedLayer>    
    <Name>openstreetmap buildings</Name>    
    <UserStyle>      
      <Name>normal</Name>
      <FeatureTypeStyle>
  <Rule>
        <MinScaleDenominator>0</MinScaleDenominator>
        <MaxScaleDenominator>13000</MaxScaleDenominator>

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func addStickers (_ arrayComp: NSArray , baseViewC: MaplyBaseViewController) {

  // Pick up a smiley face image
  let startImage = UIImage(named: "Smiley_Face_Avatar_by_PixelTwist")
  var stickers = [MaplySticker]()

  // Add a sticker for each input point
  for object in arrayComp {
    let sticker = MaplySticker()
    let center = (object as! MaplyVectorObject).center()

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static public CoordSystem MakeBNGCoordSystem(Activity activity, boolean displayVersion)
{
  String projStr = "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +no_defs";
  Proj4CoordSystem coordSys = new Proj4CoordSystem(projStr);

  // Set the bounding box for validity.  It assumes it can go everywhere by default
  Mbr bbox = new Mbr();
  bbox.addPoint(new Point2d(1393.0196,13494.9764));
  bbox.addPoint(new Point2d(671196.3657,1230275.0454));

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// Add a marker for each point in a list of vectors
private void insertClusteredMarkers(List<VectorObject> vectors, MaplyBaseController inController)
{
    // The markers will be 32x32 pixels
    Point2d size = new Point2d(32, 32);
    List<ScreenMarker> markers = new ArrayList<>();
    Bitmap icon = BitmapFactory.decodeResource(getActivity().getResources(), R.drawable.sticker);

    // For each vector object, add a marker in the middle
    for (VectorObject v : vectors) {

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// Set up a cache directory
String cacheDirName = "stamen_watercolor";
File cacheDir = new File(getActivity().getCacheDir(), cacheDirName);
cacheDir.mkdir();

// Set up the a remote tile source and point it at Stamen Watercolor
RemoteTileSource remoteTileSource = new RemoteTileSource(new RemoteTileInfo("http://tile.stamen.com/watercolor/", "png", 0, 18));
remoteTileSource.setCacheDir(cacheDir);
QuadImageTileLayer baseLayer = new QuadImageTileLayer(baseController, new SphericalMercatorCoordSystem(), remoteTileSource);

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pod 'WhirlyGlobe', :http => 'https://s3-us-west-1.amazonaws.com/whirlyglobemaplydistribution/iOS_daily_builds/WhirlyGlobe-Maply_Nightly_latest.zip' 

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// A test case that displays an animated weather layer on top of
//  the standard Geography Class basemap.
// This is part of the AutoTester in the WhirlyGlobe-Maply repo.
class AnimatedBasemapTestCase: MaplyTestCase {

  	// Use Geography Class as the base layer
	let geographyClass = GeographyClassTestCase()
	let cacheDir = NSSearchPathForDirectoriesInDomains(.CachesDirectory, .UserDomainMask, true)[0]
	var tileSources = [MaplyRemoteTileInfo]()

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func createLayer(baseView: MaplyBaseViewController) -> (MaplyQuadImageTilesLayer) {
	let precipTileSource = MaplyMultiplexTileSource(sources: tileSources)
	// Create a precipitation layer that animates
	let precipLayer = MaplyQuadImageTilesLayer(tileSource: precipTileSource!)
	precipLayer?.imageDepth = UInt32(tileSources.count)
	precipLayer?.animationPeriod = 1.0
	precipLayer?.imageFormat = MaplyQuadImageFormat.ImageUByteRed
	precipLayer?.numSimultaneousFetches = 4
	precipLayer?.handleEdges = false
	precipLayer?.coverPoles = false