First time here? First time here? Newsletter Signup Newsletter
Login | Register | 651326 Members and growing!
Search tutorials
Author: Flash Junkie | Website:

How To Find The Mouse Location

Why do we need to know the mouse location?

Since the 0,0 coordinate in this demonstration never moves, all we need to know to do some Trigonometry is the length of two sides of the triangle. Since we do know two sides (the x and y value of the mouse are distances... and are the two sides of the triangle) we can calculate the third side of the triangle (the hypotenuse) using the formula (a^2 + b^2 = c^2). More on that:

Comment: ----------------------------------------------
Comment:     determine hypotenuese length
Comment: ----------------------------------------------
Comment: a squared plus b squared = c squared... (c=hypotenuse) so what is c?
Set Variable: "input" = (mouse_x * mouse_x) + (mouse_y * mouse_y)
Call ("sqrt")
Set Variable: "hyp" = output

For now, let's just say you set a variable "input" call "sqrt" and it sends back a variable "output", which is the square root of the number you sent.

Now we know the length of the hypotenuse. 'Hyp'.  Since the x position of the user's mouse is "A" and the y position of the user's mouse is "O" we now have more than enough information to determine the angle "Theta".

Comment: ----------------------------------------------
Comment:     determine sin(theta)
Comment: ----------------------------------------------
Comment: now we know "c" (the hypotenuse) how do we find the angle? Sine(Theta) is Opposite over
Hypotenuse, then lookup the Sine value in the lookup table.
Set Variable: "sin_theta" = mouse_y/hyp
If (sin_theta<0)
	Set Variable: "sin_theta" = sin_theta+(sin_theta*-2)
End If
» Level Advanced

Added: 2000-12-18
Rating: 6 Votes: 92
(10 being the highest)
» Author
Flashjunkie is a self-professed obsessive addict of life. Due to the highly artistic nature required of an Art Director for an Ad agency, he took up Flash to add some math to his diet.
» Download
Download the files used in this tutorial.
» Forums
More help? Search our boards for quick answers!


  • 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  • Your email address will not be published.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: Inocreato
» Title: RaiseTheBlocks
» Description: Raise all the blocks to win the game
Featured Sound Loops
Image for equalize

Audio Player

» Author: TomCat Carty
» Title: The Wood
» Description: Just a little game ending or it can maybe be looped. Recorders with music box and percussion to give the feel of well, I don't know, the woods? Free to use, just credit me. thank you
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: Davisigner
» Description: Hmm... what to say about this one? It's reminiscent of the closing notes of the opening music from the Three Stooges done in a church organ style with a closing cymbal crash. I'll give this one away gratis, but feel free to check out my free loops and potential upcoming license-mandated ones over in the respective part of Flashkit.