remove outdated api docs, rename heading

docs/usage/drawing.rst

@@ -14,28 +14,14 @@ Example
     $image = $imagine->create(new Box(400, 300), new Color('#000'));
     
     $image->draw()
-        ->ellipse(new Point(200, 150), 300, 225, new Color('fff'));
+        ->ellipse(new Point(200, 150), new Box(300, 225), new Color('fff'));
         
     $image->save('/path/to/ellipse.png');
 
 The above example would draw an ellipse on a black 400x300px image, of white color. It would place the ellipse in the center of the image, and set its larger radius to 300px, with a smaller radius of 225px. You could also make the ellipse filled,  by passing `true` as the last parameter
 
-Available methods
------------------
-
-The drawer interface defines the following methods:
-
-* ``->arc(PointInterface $center, $width, $height, $start, $end, Color $color)`` - draws an arc, at the center in `$center` coordinates, of `$width` and `$height` radiuses, at the `$start` and `$end` angles and of `$color` color
-* ``->chord(PointInterface $center, $width, $height, $start, $end, Color $color, $fill = false)`` - same as arc, except the start and end points are connected with a straight line. The `$fill` option let's you make the chord color-filled, its defaulted to `false`
-* ``->ellipse(PointInterface $center, $width, $height, Color $color, $fill = false)`` draws an ellipse, parameters are same as in arc and chord, except the angles are 0 to 360 to make a full ellipse.
-* ``->line(PointInterface $start, PointInterface $end, Color $outline)`` - draws a line from `$start` to `$end` of `$color` color
-* ``->pieSlice(PointInterface $center, $width, $height, $start, $end, Color $color, $fill = false)`` - same as arc, but also connects the `$start` and `$end` to the ellipse center
-* ``->dot(PointInterface $position, Color $color)`` - places a 1px dot at `$position`, filled with specified `$color`
-* ``->polygon(array $coordinates, Color $color, $fill = false)`` - draws or outlines a polygon of a specified `$color`. The `$coordinates` array must be a collection of at least three PointInterface instances, that tell Drawer the path of the polygon its drawing
-* ``->text($string, Font $font, PointInterface $position, $angle = 0)`` - places a string of specified ``$font`` at a specified ``$position`` from top left of the image, applying clock-wise ``$angle`` rotation
-
-Font class
-----------
+Text
+----
 
 As you've noticed from ``DrawerInterface::text()``, there is also ``Font`` class. This class is a simple value object, representing the font. To construct a font, you have to pass the ``$file`` string (path to font file), ``$size`` value (integer value, representing size points) and ``$color`` (``Imagine\Image\Color`` instance). After you have a font instance, you can use one of its three methods to inspect any of the values it's been constructed with: