improved logging

src/body/Composite.js

@@ -85,7 +85,7 @@ var Body = require('./Body');
             case 'body':
                 // skip adding compound parts
                 if (obj.parent !== obj) {
-                    Common.log('Composite.add: skipped adding a compound body part (you must add its parent instead)', 'warn');
+                    Common.warn('Composite.add: skipped adding a compound body part (you must add its parent instead)');
                     break;
                 }
 

src/constraint/MouseConstraint.js

@@ -42,7 +42,7 @@ var Bounds = require('../geometry/Bounds');
                 mouse = Mouse.create(options.element);
             } else {
                 mouse = Mouse.create();
-                Common.log('MouseConstraint.create: options.mouse was undefined, options.element was undefined, may not function as expected', 'warn');
+                Common.warn('MouseConstraint.create: options.mouse was undefined, options.element was undefined, may not function as expected');
             }
         }
 

src/core/Common.js

@@ -301,24 +301,53 @@ module.exports = Common;
     };
 
     /**
-     * A wrapper for console.log, for providing errors and warnings.
-     * @method log
-     * @param {string} message
-     * @param {string} type
+     * The console logging level to use, where each level includes all levels above and excludes the levels below.
+     * The default level is 'debug' which shows all console messages.  
+     * Possible level values are:
+     * - 0 = None
+     * - 1 = Debug
+     * - 2 = Info
+     * - 3 = Warn
+     * - 4 = Error
+     * @property Common.logLevel
+     * @type {Number}
+     * @default 1
      */
-    Common.log = function(message, type) {
-        if (!console || !console.log || !console.warn)
-            return;
+    Common.logLevel = 1;
 
-        switch (type) {
+    /**
+     * Shows a `console.log` message only if the current `Common.logLevel` allows it.
+     * The message will be prefixed with 'Matter.js' to make it easily identifiable.
+     * @method log
+     * @param ...objs {} The objects to log.
+     */
+    Common.log = function() {
+        if (console && Common.logLevel > 0 && Common.logLevel <= 3) {
+            console.log.apply(console, [Matter.name + ':'].concat(Array.prototype.slice.call(arguments)));
+        }
+    };
 
-        case 'warn':
-            console.warn('Matter.js:', message);
-            break;
-        case 'error':
-            console.log('Matter.js:', message);
-            break;
+    /**
+     * Shows a `console.info` message only if the current `Common.logLevel` allows it.
+     * The message will be prefixed with 'Matter.js' to make it easily identifiable.
+     * @method info
+     * @param ...objs {} The objects to log.
+     */
+    Common.info = function() {
+        if (console && Common.logLevel > 0 && Common.logLevel <= 2) {
+            console.info.apply(console, [Matter.name + ':'].concat(Array.prototype.slice.call(arguments)));
+        }
+    };
 
+    /**
+     * Shows a `console.warn` message only if the current `Common.logLevel` allows it.
+     * The message will be prefixed with 'Matter.js' to make it easily identifiable.
+     * @method warn
+     * @param ...objs {} The objects to log.
+     */
+    Common.warn = function() {
+        if (console && Common.logLevel > 0 && Common.logLevel <= 3) {
+            console.warn.apply(console, [Matter.name + ':'].concat(Array.prototype.slice.call(arguments)));
         }
     };
 

src/core/Engine.js

@@ -42,7 +42,7 @@ var Body = require('../body/Body');
         options = options || {};
 
         if (element || options.render) {
-            Common.log('Engine.create: engine.render is deprecated (see docs)', 'warn');
+            Common.warn('Engine.create: engine.render is deprecated (see docs)');
         }
 
         var defaults = {

src/core/Plugin.js

@@ -16,17 +16,17 @@ var Common = require('./Common');
 
     Plugin.exports = function(plugin) {
         if (!Plugin.isValid(plugin)) {
-            Common.log('Plugin.exports: ' + Plugin.toString(plugin) + ' does not implement all required fields.', 'warn');
+            Common.warn('Plugin.exports:', Plugin.toString(plugin), 'does not implement all required fields.');
         }
 
         if (plugin.name in Plugin._registry) {
             var registered = Plugin._registry[plugin.name];
 
             if (Plugin.versionParse(plugin.version).number >= Plugin.versionParse(registered.version).number) {
-                Common.log('Plugin.exports: ' + Plugin.toString(registered) + ' was upgraded to ' + Plugin.toString(plugin), 'warn');
+                Common.warn('Plugin.exports:', Plugin.toString(registered), 'was upgraded to', Plugin.toString(plugin));
                 Plugin._registry[plugin.name] = plugin;
             } else {
-                Common.log('Plugin.exports: ' + Plugin.toString(registered) + ' can not be downgraded to ' + Plugin.toString(plugin), 'warn');
+                Common.warn('Plugin.exports:', Plugin.toString(registered), 'can not be downgraded to', Plugin.toString(plugin));
             }
         } else {
             Plugin._registry[plugin.name] = plugin;
@@ -65,12 +65,12 @@ var Common = require('./Common');
      */
     Plugin.installDependencies = function(base) {
         if (!base.uses || base.uses.length === 0) {
-            Common.log('Plugin.installDependencies: ' + Plugin.toString(base) + ' does not specify any dependencies to install.', 'warn');
+            Common.warn('Plugin.installDependencies:', Plugin.toString(base), 'does not specify any dependencies to install.');
             return;
         }
 
         if (base.used && base.used.length > 0) {
-            Common.log('Plugin.installDependencies: ' + Plugin.toString(base) + ' has already installed its dependencies.', 'warn');
+            Common.warn('Plugin.installDependencies:', Plugin.toString(base), 'has already installed its dependencies.');
             return;
         }
 
@@ -121,16 +121,14 @@ var Common = require('./Common');
                 resolved = Plugin.resolve(dependency);
 
             if (resolved && !Plugin.versionSatisfies(resolved.version, parsed.range)) {
-                Common.log(
-                    'Plugin.trackDependencies: ' + Plugin.toString(resolved) + ' does not satisfy ' 
-                    + Plugin.toString(parsed) + ' used by ' + Plugin.toString(parsedBase) + '.', 
-                    'warn'
+                Common.warn(
+                    'Plugin.trackDependencies:', Plugin.toString(resolved), 'does not satisfy',
+                    Plugin.toString(parsed), 'used by', Plugin.toString(parsedBase) + '.'
                 );
             } else if (!resolved) {
-                Common.log(
-                    'Plugin.trackDependencies: ' + dependency + ' used by ' 
-                    + Plugin.toString(parsedBase) + ' could not be resolved.',
-                     'warn'
+                Common.warn(
+                    'Plugin.trackDependencies:', dependency, 'used by',
+                    Plugin.toString(parsedBase), 'could not be resolved.'
                 );
             }
 

src/factory/Bodies.js

@@ -214,7 +214,7 @@ var Vector = require('../geometry/Vector');
         minimumArea = typeof minimumArea !== 'undefined' ? minimumArea : 10;
 
         if (!window.decomp) {
-            Common.log('Bodies.fromVertices: poly-decomp.js required. Could not decompose vertices. Fallback to convex hull.', 'warn');
+            Common.warn('Bodies.fromVertices: poly-decomp.js required. Could not decompose vertices. Fallback to convex hull.');
         }
 
         // ensure vertexSets is an array of arrays

src/render/RenderPixi.js

@@ -39,7 +39,7 @@ var Vector = require('../geometry/Vector');
      * @deprecated
      */
     RenderPixi.create = function(options) {
-        Common.log('RenderPixi.create: Matter.RenderPixi is deprecated (see docs)', 'warn');
+        Common.warn('RenderPixi.create: Matter.RenderPixi is deprecated (see docs)');
 
         var defaults = {
             controller: RenderPixi,
@@ -118,7 +118,7 @@ var Vector = require('../geometry/Vector');
         if (Common.isElement(render.element)) {
             render.element.appendChild(render.canvas);
         } else {
-            Common.log('No "render.element" passed, "render.canvas" was not inserted into document.', 'warn');
+            Common.warn('No "render.element" passed, "render.canvas" was not inserted into document.');
         }
 
         // prevent menus on canvas