How to determine the coordinates of the point?

I've achieved assignment 3 for CS193p course of Stanford, Fall 2011. The assignment basically asks to make a graph of points of an equation of something like X + 2, X is the X axis, and X + 2 (which is the result of the equation) is the Y axis.
The problem is that it gives an already made class which draws axes, hashmarks and so. The lecturer describes how it works in a commented paragraph in the .h file of the drawer, I still can't understand though how can I count the number of points between the origin and the hashmark, then convert it to pixels and iterate over it. The hard part of it is getting the hashmark position, or in other words, knowing where to put X and where to put Y according to the current scale.
A subtask is to make a zoom in and zoom out buttons, and I've already done that by the way.
You can download everything from here.
The axes drawer class: AxesDrawer.zip
The assignment PDF: Assignment 3.pdf
My project: Assignment 3.zip
Any help is appreciated.

Can someone help please?

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I'm trying to create a cartoon taking a movie (I've chosen blade runner) as base. I've got the real movie and I've exported all the pictures using VirtualDUB. Now I have a lot of images to modify. I would like to modify the actors faces with the faces generated by Facegen modeller. I'm thinking how to make the whole process automatic because I have a lot of images to manage. I've chosen to use Automate BPA,because it seems the best for this matter. I'm a newbie,so this is my first attempt using Adobe Photoshop and Automate BPA. I wrote a little script. It takes a face generated with Facegen modeller and tries to put it above the original actors faces. But it doesn't work very good and I'm not really satisfied,because the process is not fully automated. To save some time I need to write a script that captures the coordinates of the mouse when I click over the faces and that saves them into a file,so that Automate BPA can read these coordinates from that file and can put the face generated with Facegen Modeller above the original face. I think that Automate BPA is not good for this matter. I think that two coordinates are enough,X and Y. They can be the coordinates of the nose,because it is always in the middle of every face. It is relevant to knows how big should be the layer of the new face,too. This is the Automate BPA code that I wrote :
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<AMSET VARIABLENAME="nome_foto">br</AMSET>
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<AMVARIABLE NAME="coord_y" TYPE="NUMBER"></AMVARIABLE>
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<AMWINDOWMINIMIZE WINDOWTITLE="AutoMate BPA Server Management Console
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<AMMOUSEMOVEOBJECT WINDOWTITLE="Apri" OBJECTNAME="%nome_foto &
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and this is a short video to explain better what I want to do :
http://www.flickr.com/photos/26687972@N03/5331705934/
In the last scene of the video you will see the script asking to input the X and the Y coordinates of the nose. This request is time consuming. For this reason I want to write a script that captures automatically the coordinates of the mouse clicks. The only thing to do should be click over the nose and the script should make the rest. As "c.pfaffenbichler" suggested here : http://forums.adobe.com/thread/775219, I could explore 3 ways :
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2) use After Effects would provide a better solution.
3) Photoshop’s Animation Panel might also offer some easier way as it might be possible to load two movies (or one movie and one image) and animate the one with the rendered head in relation to the other.
Since I'm a totally newbie in graphic and animation,could you help me to explore these ways ? Thanks for your cooperation.

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Message was edited by: LaoMar

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How to determine the coordinates of the point?

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