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Detecting the Mouse Angle - Easily
Author: Jorian Cunliffe

Page 4
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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
Else
 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

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» Level Intermediate

Added: : 2000-12-21 Rating: 7.27 Votes: 40 Hits: 494

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