Update changelog, doco and reason for using name rather than id

graphp#3

CHANGELOG.md

@@ -4,6 +4,11 @@ This file is a manually maintained list of changes for each release. Feel free
 to add your changes here when sending pull requests. Also send corrections if
 you spot any mistakes.
 
+## 0.2.2 (2017-04-07)
+
+*   Allow setting of graph name via graphviz.name attribute 
+    ([#20](https://github.com/graphp/graphviz/pull/20))
+
 ## 0.2.1 (2015-03-08)
 
 *   Support graph v0.9 (while keeping BC)

README.md

@@ -17,6 +17,8 @@ Once [installed](#install), let's build and display a sample graph:
 
 ````php
 $graph = new Fhaculty\Graph\Graph();
+// Set graph name to blank to hide default G tooltip for SVG output
+$graph->setAttribute('graphviz.name', '');
 
 $blue = $graph->createVertex('blue');
 $blue->setAttribute('graphviz.color', 'blue');

src/GraphViz.php

@@ -226,6 +226,11 @@ public function createScript(Graph $graph)
         $alg = new Directed($graph);
         $directed = $alg->hasDirected();
 
+        /*
+         * The website [http://www.graphviz.org/content/dot-language] uses the term `ID` when displaying
+         * the abstract grammar for the DOT language.
+         * But the man pages for dot use the term `name` when describing the graph file language.
+         */
         $name = $graph->getAttribute('graphviz.name');
         if ($name === null || $name === 'G') {
             // don't escape a name of G to maintain default behavior