5 files changed, 42 insertions, 2 deletions
diff --git a/src/math/boundings.php b/src/math/boundings.php
index 825700f..f88f4b2 100644
--- a/src/math/boundings.php
+++ b/src/math/boundings.php
@@ -14,6 +14,10 @@
  * Currently only works with plane rectangular boundings, should be enhanced by
  * rotated rectangular boundings.
  *
+ * This class is only used internally to represent space which is used by
+ * certain obejcts on the drawing plane, or which free space is still
+ * available.
+ *
  * @version //autogentag//
  * @package Graph
  * @access private
diff --git a/src/math/rotation.php b/src/math/rotation.php
index bbc4f1e..12ddd44 100644
--- a/src/math/rotation.php
+++ b/src/math/rotation.php
@@ -11,6 +11,15 @@
 /**
  * Class to create rotation matrices from given rotation and center point
  *
+ * Three dimensional matrices (3x3) may be used to specify transformation of
+ * points, vectors and complexer structures in a two dimensional cartesian
+ * coordinate system. For more details have a look here:
+ * http://en.wikipedia.org/wiki/Transformation_matrix
+ *
+ * This class implements a convenient interface to create matrixes to rotate
+ * elements. This matrix may be combined with other transformation matrices, as
+ * usual.
+ *
  * @version //autogentag//
  * @package Graph
  * @access private
diff --git a/src/math/transformation.php b/src/math/transformation.php
index 78b95f1..a1ed70b 100644
--- a/src/math/transformation.php
+++ b/src/math/transformation.php
@@ -9,8 +9,19 @@
  * @access private
  */
 /**
- * Class defining transformations like scaling and rotation by a 
- * 3x3 transformation matrix for |R^2
+ * Class defining transformations
+ *
+ * Three dimensional matrices (3x3) may be used to specify transformation of
+ * points, vectors and complexer structures in a two dimensional cartesian
+ * coordinate system. For more details have a look here:
+ * http://en.wikipedia.org/wiki/Transformation_matrix
+ *
+ * There are some classes extending this basic tranformation class, to
+ * give you more convinient access to the creation of such transformation
+ * matrices, which are:
+ * 
+ * - ezcGraphRotation (rotations of objects)
+ * - ezcGraphTranslation (moving of objects)
  *
  * @version //autogentag//
  * @package Graph
diff --git a/src/math/translation.php b/src/math/translation.php
index ca22063..a9b1c3c 100644
--- a/src/math/translation.php
+++ b/src/math/translation.php
@@ -11,6 +11,15 @@
 /**
  * Class creating translation matrices from given movements
  *
+ * Three dimensional matrices (3x3) may be used to specify transformation of
+ * points, vectors and complexer structures in a two dimensional cartesian
+ * coordinate system. For more details have a look here:
+ * http://en.wikipedia.org/wiki/Transformation_matrix
+ *
+ * This class implements a convenient interface to create matrixes to move
+ * elements. This matrix may be combined with other transformation matrices, as
+ * usual.
+ *
  * @version //autogentag//
  * @package Graph
  * @access private
diff --git a/src/math/vector.php b/src/math/vector.php
index 9415bca..c34b34d 100644
--- a/src/math/vector.php
+++ b/src/math/vector.php
@@ -11,6 +11,13 @@
 /**
  * Represents two dimensional vectors
  *
+ * This class is internally used to represent vectors for geometric calculation
+ * in the two dimensional cartesian coordinate system.
+ *
+ * Vectors are an extension of the basic coordinate class, and add methods to
+ * calculate the length of a vector, perform various operations on angles, like
+ * rotations and the calculation of angles between two vectors.
+ *
  * @version //autogentag//
  * @package Graph
  * @access private