Graal Forums - Switch and case?

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- - Switch and case? (https://forums.graalonline.com/forums/showthread.php?t=134262269)

Astram

03-01-2011 02:12 AM

Switch and case?

What does this mean, and how do I use it. Its in the end of my staff boots script?

PHP Code:


		
			
function onTimeOut()



{



 if (this.staff_boots == "on")



  {



   for (a=0; a<4; a++)



    {



     if (keydown(a))



      {



       switch(a)



        {



          case "0":



           player.y-=this.speed;



           break;



          case "1":



           player.x-=this.speed;



           break;



          case "2":



           player.y+=this.speed;



           break;



          case "3":



           player.x+=this.speed;



           break;



        }



      }



    }



  }



 setTimer(0.05);



}

WhiteDragon

03-01-2011 02:26 AM

It's just a different way to write an if-else when you're working with a single variable (a in this case).

That switch statement in your code translates to

PHP Code:


		
			
  if (a == "0") { 

    player.y -= this.speed; 

  } else if (a == "1") {

    player.x -= this.speed; 

  } else if (a == "2") {

    player.y += this.speed; 

  } else if (a == "3") {

    player.x += this.speed; 

  }

You can do slightly more complicated logic with switch statements, but I personally think those more complex uses of switch just makes things more confusing and bug-prone.

MrOmega

03-01-2011 07:24 AM

Try using the forum's search function, may save you some time. Search for 'Spoils of the Switch'. It helped me a lot when I first read it.

scriptless

04-29-2011 08:51 PM

For staff boots you will never need to know this.. instead use something more along the lines of:

PHP Code:


		
			
for ( i=0; i<4; i++ ) {
  if ( keydown(i) ) {
    player.x += vecx(i) * this.speed;
    player.y += vecy(i) * this.speed;
  }
}

Vec X/Y would give you -1,0,1 depending on direction. I am not completly sure how to explain it to you but I understand how it works. If im not mistaken its for finding vectors?

This greatly reduces your script length and makes it easier to modify.

WhiteDragon

04-29-2011 10:30 PM

I'm not a particularly big fan of that transformation. I find the if statement much clearer.

MrOmega

04-29-2011 11:05 PM

Nice job bringing up another old thread! :p

Anywho, vex/vecy will return the direction in which the operation points. So, let's say your xVal is 32 and you want it to be 30. So vecx( 32-30) would give you -1 since you are to move left. Up would -1 of vecy and so forth, if you aren't moving it will return 0. By graal magic it works with direction values too, 0-3. So if your face south your vecx would be 0 and vecy would be 1.

Deas_Voice

04-30-2011 12:05 AM

Hi Switch, who's Case?

gj @ bumping an old thread for no reason

WhiteDragon

04-30-2011 12:15 AM

Is providing a better solution a bad or useless thing to do?

Tigairius

05-13-2011 10:14 PM

Quote:

Originally Posted by scriptless (Post 1646442)

Vec X/Y would give you -1,0,1 depending on direction. I am not completly sure how to explain it to you but I understand how it works. If im not mistaken its for finding vectors?

Common question, posted a thread about it: http://forums.graalonline.com/forums...47#post1649547

scriptless

05-14-2011 07:20 AM

Thanks for reference Tigairius, will come in hand I'm sure. :)

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