actionscript 3 - If condition explanation AS3 -

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i found code online. i'm not sure means. it's create bouncing ball. im not sure whats saying in if condition.

is speed of object or it's going appear in stage? u please add //comment brief explanation. thank in advance!

        if ( this.x >= nstagewidth - 10 )         {             this.x = nstagewidth - 10;             nspeedx *= -1;         }         else if ( this.x <= 10 )         {             this.x = 10;             nspeedx *= -1;         }          if ( this.y >= nstageheight - 10 )         {             this.y = nstageheight - 10;             nspeedy *= -1;         }         else if ( this.y <= 10 )         {             this.y = 10;             nspeedy *= -1;         }

this code checks x or y property of object make sure it's within boundaries. if it's not, object's nspeedx or nspeedy property multiplied -1.

for example, if x less 10 or greater or equal nstagewidth-10, nspeedx multiplied -1, assume sends object traveling in opposite direction.

without more code, can't give exact implementation. however, based on how everything's named, guess code sends object bouncing 1 side of stage other (with 10 pixels of padding on either side).


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