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4/13/08 : a few bugs have been corrected (forgot about logarithmic scales in PHGraphFunction for example)
- added a flag to decide if an object must be drawn or not
- added methods to graphview, removing objects, accessors to the three objects arrays
- added methods to PHAxis to override automatic tickmarks generation

4/16/08 : a few bugs corrected here or there
- a new graph object : PHParametricCurve for automatic parametric curves (cartesian coordinates) drawing
- a mailing list has been added to discuss the development of this project

4/24/08 : a few bugs corrected, including a nasty leak with a missing release in PHAxisSystem. Following the advice of Drew MacCormack, PHColoredObject class has disappeared, replaced with a NSColor category. The inheritance is one layer shorter, and graph objects can more naturally be multicolored this way. A new object demonstrating this has been added, PHVectorField.

Distribution of the examples is now done in two zip packages containing all the (now) 6 examples binaries, or xcode projects.

3/19/09 : a few modifications to the code : an unnecessary CGContextFlush has been deleted (it induced flickering when using several graph views). The zoom out gesture has changed : alt+right click was replaced with alt+left click (the previous gesture didn't work with alt+ctrl+left click). Some changes in the PHVectorField object.