title: Meaning of top, ascent, baseline, descent, bottom, and leading in Android's FontMetrics
body: <p>This seems like a basic question, but I couldn't find a similar one on SO. While reading the <a href="http://developer.android.com/reference/android/graphics/Paint.FontMetrics.html" rel="noreferrer">documentation</a>, I was having trouble grasping the concepts. I want to understand what the difference is between <code>top</code> and <code>ascent</code> and also <code>bottom</code> and <code>descent</code>. And where exactly is the baseline? Do you have a diagram to help me visualize it?</p>