Adds spawn output rendering (variant of night which shows dark areas in red) and support for multiple map types with buttons to switch between them.

chunk.py

@@ -112,6 +112,18 @@ def iterate_chunkblocks(xoff,yoff):
 transparent_blocks = set([0, 6, 8, 9, 18, 20, 37, 38, 39, 40, 44, 50, 51, 52, 53,
     59, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 79, 81, 83, 85])
 
+# This set holds block ids that are solid blocks
+solid_blocks = set([1, 2, 3, 4, 5, 7, 12, 13, 14, 15, 16, 17, 18, 19, 20, 35,
+    41, 42, 43, 44, 45, 46, 47, 48, 49, 53, 54, 56, 57, 58, 60, 61, 62, 64, 65,
+    66, 67, 71, 73, 74, 78, 79, 80, 81, 82, 84, 86, 87, 88, 89, 91])
+
+# This set holds block ids that are fluid blocks
+fluid_blocks = set([8,9,10,11])
+
+# This set holds block ids that are not candidates for spawning mobs on
+# (glass, half blocks)
+nospawn_blocks = set([20,44])
+
 def render_and_save(chunkfile, cachedir, worldobj, cave=False, queue=None):
     """Used as the entry point for the multiprocessing workers (since processes
     can't target bound methods) or to easily render and save one chunk
@@ -617,6 +629,13 @@ class ChunkRenderer(object):
                     # block shaded with the current
                     # block's light
                     black_coeff, _ = self.get_lighting_coefficient(x, y, z)
+                    if self.world.spawn and black_coeff > 0.8 and blockid in solid_blocks and not (
+                        blockid in nospawn_blocks or (
+                            z != 127 and (blocks[x,y,z+1] in solid_blocks or blocks[x,y,z+1] in fluid_blocks)
+                        )
+                    ):
+                        composite.alpha_over(img, Image.blend(t[0], red_color, black_coeff), (imgx, imgy), t[1])
+                    else:
                         composite.alpha_over(img, Image.blend(t[0], black_color, black_coeff), (imgx, imgy), t[1])
                 else:
                     # draw each face lit appropriately,
@@ -625,18 +644,28 @@ class ChunkRenderer(object):
                     
                     # top face
                     black_coeff, face_occlude = self.get_lighting_coefficient(x, y, z + 1)
+                    # Use red instead of black for spawnable blocks
+                    if self.world.spawn and black_coeff > 0.8 and blockid in solid_blocks and not (
+                        blockid in nospawn_blocks or (
+                            z != 127 and (blocks[x,y,z+1] in solid_blocks or blocks[x,y,z+1] in fluid_blocks)
+                        )
+                    ):
+                        over_color = red_color
+                    else:
+                        over_color = black_color
+
                     if not face_occlude:
-                        composite.alpha_over(img, black_color, (imgx, imgy), ImageEnhance.Brightness(facemasks[0]).enhance(black_coeff))
+                        composite.alpha_over(img, over_color, (imgx, imgy), ImageEnhance.Brightness(facemasks[0]).enhance(black_coeff))
                     
                     # left face
                     black_coeff, face_occlude = self.get_lighting_coefficient(x - 1, y, z)
                     if not face_occlude:
-                        composite.alpha_over(img, black_color, (imgx, imgy), ImageEnhance.Brightness(facemasks[1]).enhance(black_coeff))
+                        composite.alpha_over(img, over_color, (imgx, imgy), ImageEnhance.Brightness(facemasks[1]).enhance(black_coeff))
 
                     # right face
                     black_coeff, face_occlude = self.get_lighting_coefficient(x, y + 1, z)
                     if not face_occlude:
-                        composite.alpha_over(img, black_color, (imgx, imgy), ImageEnhance.Brightness(facemasks[2]).enhance(black_coeff))
+                        composite.alpha_over(img, over_color, (imgx, imgy), ImageEnhance.Brightness(facemasks[2]).enhance(black_coeff))
 
             # Draw edge lines
             if blockid in (44,): # step block
@@ -705,6 +734,7 @@ def generate_facemasks():
     return (top, left, right)
 facemasks = generate_facemasks()
 black_color = Image.new("RGB", (24,24), (0,0,0))
+red_color = Image.new("RGB", (24,24), (229,36,38))
 
 # Render 128 different color images for color coded depth blending in cave mode
 def generate_depthcolors():

config.js

@@ -1,6 +1,5 @@
 
   var config = {
-    path:        'tiles',
     fileExt:     '{imgformat}',
     tileSize:     384,
     defaultZoom:  1,
@@ -28,6 +27,21 @@ var signGroups = [
     {label: "All", match: function(s) {return true}}
 ];
 
+/* mapTypeData -- a list of alternate map renderings available. At least one rendering must be
+ * listed.  When more than one are provided, controls to switch between them are provided, with
+ * the first one being the default.
+ *
+ * Required:
+ *     label : string. Displayed on the control.
+ *     path  : string. Location of the rendered tiles.
+ */
+var mapTypeData=[
+  {'label': 'Unlit', 'path': 'tiles'},
+//  {'label': 'Day',   'path': 'lighting/tiles'},
+//  {'label': 'Night', 'path': 'night/tiles'},
+//  {'label': 'Spawn', 'path': 'spawn/tiles'}
+];
+
 // Please leave the following variables here:
 var markerCollection = {}; // holds groups of markers
 

gmap.py

@@ -51,6 +51,7 @@ def main():
     parser.add_option("--chunklist", dest="chunklist", help="A file containing, on each line, a path to a chunkfile to update. Instead of scanning the world directory for chunks, it will just use this list. Normal caching rules still apply.")
     parser.add_option("--lighting", dest="lighting", help="Renders shadows using light data from each chunk.", action="store_true")
     parser.add_option("--night", dest="night", help="Renders shadows using light data from each chunk, as if it were night. Implies --lighting.", action="store_true")
+    parser.add_option("--spawn", dest="spawn", help="Renders shadows using light data from each chunk, as if it were night, while also highlighting areas that are dark enough to spawn mobs. Implies --lighting and --night.", action="store_true")
     parser.add_option("--imgformat", dest="imgformat", help="The image output format to use. Currently supported: png(default), jpg. NOTE: png will always be used as the intermediate image format.")
     parser.add_option("--optimize-img", dest="optimizeimg", help="If using png, perform image file size optimizations on the output. Specify 1 for pngcrush, 2 for pngcrush+optipng+advdef. This may double (or more) render times, but will produce up to 30% smaller images. NOTE: requires corresponding programs in $PATH or %PATH%")
     parser.add_option("-q", "--quiet", dest="quiet", action="count", default=0, help="Print less output. You can specify this option multiple times.")
@@ -123,7 +124,8 @@ def main():
         logging.info("Notice: Not using biome data for tinting")
 
     # First generate the world's chunk images
-    w = world.WorldRenderer(worlddir, cachedir, chunklist=chunklist, lighting=options.lighting, night=options.night, useBiomeData=useBiomeData)
+    w = world.WorldRenderer(worlddir, cachedir, chunklist=chunklist, lighting=options.lighting, night=options.night, spawn=options.spawn, useBiomeData=useBiomeData)
+
     w.go(options.procs)
 
     # Now generate the tiles

web_assets/functions.js

@@ -37,6 +37,7 @@ function drawMapControls() {
     compassImg.src="compass.png";
     compassDiv.appendChild(compassImg);
 
+    compassDiv.index = 0;
     map.controls[google.maps.ControlPosition.TOP_RIGHT].push(compassDiv);
 
 
@@ -260,16 +261,23 @@ function initialize() {
         if (argname == "zoom") {zoom = parseInt(value);}
     }
 
+    var mapTyepControlToggle = false
+    if (mapTypeIds.length > 1) {
+      mapTyepControlToggle = true
+    }
     var mapOptions = {
         zoom: zoom,
         center: new google.maps.LatLng(lat, lng),
         navigationControl: true,
         scaleControl: false,
-        mapTypeControl: false,
+        mapTypeControl: mapTyepControlToggle,
+        mapTypeControlOptions: {
+            mapTypeIds: mapTypeIds
+        },
+        mapTypeId: mapTypeIdDefault
         streetViewControl: false,
-        mapTypeId: 'mcmap'
     };
-    map = new google.maps.Map(document.getElementById("mcmap"), mapOptions);
+    map = new google.maps.Map(document.getElementById('mcmap'), mapOptions);
 
     if(config.debug) {
         map.overlayMapTypes.insertAt(0, new CoordMapType(new google.maps.Size(config.tileSize, config.tileSize)));
@@ -287,11 +295,12 @@ function initialize() {
     }
 
     // Now attach the coordinate map type to the map's registry
-    map.mapTypes.set('mcmap', MCMapType);
+    for (idx in MCMapType) {
+      map.mapTypes.set('mcmap' + MCMapType[idx].name, MCMapType[idx]);
+    }
 
     // We can now set the map to use the 'coordinate' map type
-    map.setMapTypeId('mcmap');
+    map.setMapTypeId(mapTypeIdDefault);
-
 
     // initialize the markers and regions
     initMarkers();
@@ -370,9 +379,9 @@ function initialize() {
     return new google.maps.LatLng(lat, lng);
   }
   
-  var MCMapOptions = {
+function getTileUrlGenerator(path) {
-    getTileUrl: function(tile, zoom) {
+  return function(tile, zoom) {
-      var url = config.path;
+    var url = path;
       if(tile.x < 0 || tile.x >= Math.pow(2, zoom) || tile.y < 0 || tile.y >= Math.pow(2, zoom)) {
         url += '/blank';
       } else if(zoom == 0) {
@@ -390,17 +399,33 @@ function initialize() {
         url += '?c=' + Math.floor(d.getTime() / (1000 * 60 * config.cacheMinutes));
       }
       return(url);
-    },
+  }
+}
+
+var MCMapOptions = new Array;
+var MCMapType = new Array;
+var mapTypeIdDefault = null;
+var mapTypeIds = [];
+for (idx in mapTypeData) {
+  var view = mapTypeData[idx];
+
+  MCMapOptions[view.label] = {
+    getTileUrl: getTileUrlGenerator(view.path),
     tileSize: new google.maps.Size(config.tileSize, config.tileSize),
     maxZoom:  config.maxZoom,
     minZoom:  0,
     isPng:    !(config.fileExt.match(/^png$/i) == null)
   };
   
-  var MCMapType = new google.maps.ImageMapType(MCMapOptions);
+  MCMapType[view.label] = new google.maps.ImageMapType(MCMapOptions[view.label]);
-  MCMapType.name = "MC Map";
+  MCMapType[view.label].name = view.label;
-  MCMapType.alt = "Minecraft Map";
+  MCMapType[view.label].alt = "Minecraft " + view.label + " Map";
-  MCMapType.projection = new MCMapProjection();
+  MCMapType[view.label].projection = new MCMapProjection();
+  if (mapTypeIdDefault == null) {
+    mapTypeIdDefault = 'mcmap' + view.label;
+  }
+  mapTypeIds.push('mcmap' + view.label);
+}
   
   function CoordMapType() {
   }

web_assets/style.css

@@ -25,7 +25,7 @@ body { height: 100%; margin: 0px; padding: 0px ; background-color: #000; }
 
 #signControl > div#top {
     background-color: #fff;
-    border: 1px solid #000;
+    border: 2px solid #000;
     text-align: center;
     width: 70px;
     font-size: 12px;

world.py

@@ -95,11 +95,12 @@ class WorldRenderer(object):
     files to update. If it includes a trailing newline, it is stripped, so you
     can pass in file handles just fine.
     """
-    def __init__(self, worlddir, cachedir, chunklist=None, lighting=False, night=False, useBiomeData=False):
+    def __init__(self, worlddir, cachedir, chunklist=None, lighting=False, night=False, spawn=False, useBiomeData=False):
         self.worlddir = worlddir
         self.caves = False
-        self.lighting = lighting or night
+        self.lighting = lighting or night or spawn
-        self.night = night
+        self.night = night or spawn
+        self.spawn = spawn
         self.cachedir = cachedir
         self.useBiomeData = useBiomeData