First time here? First time here? Newsletter Signup Newsletter
Search tutorials
Author: Jorian Cunliffe | Website: http://

Code (cont.)

Third step determines the direction, whilst only approximate the direction is often good enough for games and animation, the loop is very fast:

Comment: determine the direction
If ((dist_x>=0) and (dist_y>=0))
      Set Variable: "direction" = 90*(dist_y/normalise)
Else If ((dist_x<=0) and (dist_y>=0))
      Set Variable: "direction" = -1*90*(dist_x/normalise) + 90
Else If ((dist_x<=0) and (dist_y<=0))
      Set Variable: "direction" = -1*90*(dist_y/normalise) + 180
      Set Variable: "direction" = 90*(dist_x/normalise) + 270
End If

Rotate the object to the direction angle:

Comment:   set direction of arrow
Set Property ("/arrow", Rotation) = direction

A final note with rotation: if the object being rotated shrinks after being rotated for a while (a bug in Flash4) you can slow down the rate of shrinkage by making the direction an int ie direction = int(direction)

Finally the code here is used to calculate the movement of a projectile from the origin to the mouse. xmov and ymov values are given, however for a real situation these values would be multiplied by the speed of the bullet

Comment:   not required for this example
Comment:   but may be useful
Comment:  determine x and y movements for a bullet to go from origin to mouse
Set Variable: "xmov" = dist_x/normalise
Set Variable: "ymov" = dist_y/normalise
» Level Intermediate

Added: 2000-12-21
Rating: 7 Votes: 41
(10 being the highest)
» Author
No information about the author has been provided.
» 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  • Your email address will not be published.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.