Close #51 : Set 'blocksvision = false' on a tile's properties to make it see through on a collision layer

moonlight/src/AISprite.js

@@ -63,8 +63,21 @@ var AISprite = function(game, x, y, key, frame) {
 	    for ( var ctr = 1; ctr < viewcoords.length ; ctr++ ) {
 		var coord = [parseInt(viewcoords[ctr][0]),
 			     parseInt(viewcoords[ctr][1])];
-		if ( grid.nodes[coord[1]][coord[0]].walkable == false )
-		    return false;
+		if ( grid.nodes[coord[1]][coord[0]].walkable == false ) {
+		    if ( grid.nodes[coord[1]][coord[0]].isAISprite == true )
+			return false;
+
+		    tiles = tilesFromCollisionLayers(coord[0] * TILE_WIDTH,
+						     coord[1] * TILE_HEIGHT);
+		    for ( var i = 0; i < tiles.length ; i++ ) {
+			// Default behavior is for all colliding tiles to block vision,
+			// they have to set property 'blocksvision' == false to prevent it
+			if ( (tiles[i].index != -1 && 
+			      isSet(tiles[i].properties['blocksvision']) == false) || 
+			     parseBoolean(tiles[i].properties['blocksvision']) == true )
+			    return false;
+		    }
+		}
 	    }
 	    return true;
 	}

moonlight/src/Util.js

@@ -303,10 +303,56 @@ function gridWithAISprites()
 	var normx = Math.max(parseInt(spr.x/32), 0);
 	var normy = Math.max(parseInt(spr.y/32), 0);
 	grid.nodes[normy][normx].walkable = false;
+	grid.nodes[normy][normx].isAISprite = true;
     }
     return grid;
 }
 
+function getTileTileset(tile) 
+{
+    var last = null;
+    game.state.states.game.map.tilesets.forEach(function(ts) {
+	if ( isSet(last) == false && ts.firstgid < tile.index ) {
+	    last = ts;
+	    return;
+	} else if ( isSet(last) == true &&
+		    ts.firstgid < tile.index &&
+		    ts.firstgid > last.firstgid ) {
+	    last = ts;
+	    return;
+	}
+    }, this);
+    return last;
+}
+
+function setTileProperties(tile)
+{
+    tile.properties = {};
+    if ( tile.index == -1 ) {
+	return;
+    }
+    var tileset = getTileTileset(tile);
+    // Great, our tileset doesn't have any properties.
+    if ( isSet(tileset.tileProperties) == false) {
+	return;
+    }
+    tile.properties = tileset.tileProperties[tile.index - tileset.firstgid];
+    if ( isSet(tile.properties) == false )
+	tile.properties = {};
+}
+
+function tilesFromCollisionLayers(x, y)
+{
+    layers = game.state.states.game.map_collision_layers;
+    var res = [];
+    layers.forEach(function(layer) {
+	var tile = layer.getTiles(x, y, 1, 1)[0];
+	setTileProperties(tile);
+	res.push(tile);
+    }, this);
+    return res;
+}
+
 function stringifyInt(x)
 {
     return ("" + x);