First time here? First time here? Newsletter Signup Newsletter
651326 Members and growing! | Flash Jobs
Search tutorials
Author: Andrew Spear | Website: http://www.etheory.co.nz

The Actions

The basic idea is that we have to calculate the angle from the eye position to the mouse position and then rotate the eye by that angle. To do this we need to get out the old school text books and look up some trigonometry! Luckily I have already done this for you, remember this from your high school days ... ? ; if tanA = a/b ; then A = tan-1 (a/b) ... No? Well Macromedia did and they have added support for these functions and plenty more into Flash5. So basicly, we can calculate angle A if we get distances a and b, to get this we can use the following code to frame one of our movie:
a = eye._y-_ymouse;
b = eye._x-_xmouse;
Now, to turn those distances into angle A we can use this code:
angleA = Math.atan2(a, b);
The only problem is that this gives you the angel not in degrees but in “radians”, another way of measuring angles. To convert angleA into degrees we use this line:
degrees = angleA/(Math.pi/180);
Now we have the angle in degrees that the eye needs to rotate. All that remains is to rotate the eye by the angle “degrees” using this code:
setProperty ("eye", _rotation, degrees);
Now if you test your movie the left eye should turn around and follow your cursor where ever it goes. Finally you need to make a second copy of this entire code to make the second eye move also - you will need to change the value names to something different so they dont get mixed up. Here is the final code that should be in frame one of your actions layer:
a = eye._y-_ymouse;
b = eye._x-_xmouse;
angleA = Math.atan2(a, b);
degrees = angleA/(Math.pi/180);
setProperty ("eye", _rotation, degrees);

a2 = eye2._y-_ymouse;
b2 = eye2._x-_xmouse;
angleA2 = Math.atan2(a2, b2);
degrees2 = angleA2/(Math.pi/180);
setProperty ("eye2", _rotation, degrees2);
Now test your movie and see that it is working, if not check that it is the same as LookingFinal.fla which is also included with this tutorial and has the script working. But all that is just for starters...
» Level Advanced

Added: 2002-01-08
Rating: 9 Votes: 208
(10 being the highest)
» Author
Andrew is the creative director, technical director and general big boss man at eTheory - a web, multimedia and graphic design company based in New Zealand. He has a Diploma in Visual Communications and Design under his belt on top of a long history in html, php and mySQL.
» Download
Download the files used in this tutorial.
» Forums
More help? Search our boards for quick answers!

Comments

  • There are no comments yet. Be the first to comment!

  • You must have javascript enabled in order to post comments.

Leave a Comment
  • Your email address will not be published. All fields are required.
Featured Flash FLA
» Author: doc_chin7
» Description:

The flash's horizontal road drive was done in CS4 and was upgraded to CS6. The car responds to right/ left key and flash will auto-generate the movement of roads from left-right or right-left based on random number. Have fun driving in this virtual environment and avoid other cars... :) If you are creative, a road driving game can be created from it.

Featured Sound Loops
Image for equalize

Audio Player

» Author: BoxCat
» Title: CPU Talk
» Description: From the cyberpunk RPG, "Nameless: the Hackers" Completely Free to use! Keywords: edm hip hop rap electronic mysterious mission hacking chase exciting spy ios ambient chilling love happy sad angry suspense
Latest Font
» Author: Fábio FAFERS
» Description: I created this font for free use. Everyone can apply it in personal or business texts. Its free, but I want to be communicated in case of business use. Donations are accepted to keep the project of free fonts alive! Thank you all
Featured Sound Fx
Image for equalize

Audio Player

» Author: nathan
» Description:

A recorded sound of the Dimensional Fork Gate.