Correct expression for random direction event

[Wodjanoi]

Let's say a player object shoots bullets in the current direction of the player object and I want a 25 percent chance that the shooting direction changes from the current direction to current direction -1 or current direction +1?

Set direction("bullet") to dir("player object")

[Sumo]

Before your shooting code, add a new line of code above. When you click, you set a counter or alterable value to Random(4). You can set any of the numbers (0-3) to be the trigger for your 25% value.

An easy way to randomize set values is to use a list object. You fill the list object with your options, so -1 or 1. Then you can do get Line random(total number of lines) to pick a random value from your selected pool.

Then add a new condition in your shooting code. Test to see if that alterable value or counter equals your value you're testing, say 0. Then set the bullet direction to your players current direction+get Line random(total number of lines).

You would have to copy your shooting line code and make sure when the value doesn't equal 0, then it just shoots normally.

There's a bunch of ways to do this probably, but this is one of the easier ways.


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[Volnaiskra]

you can do it within one action this way:



The random number (from -4 to 4) will be quartered and rounded down into an integer (because direction only accepts integers), so everything other than 4 or -4 will end up producing 0

Technically, this probably doesn't produce a 25% chance (2 out of 8) but something like a 22.222% chance (2 out of 9). rrandom(-4,4) produces 9 possibilities (-4, -3, -2, -1, 0, 1, 2, 3, 4) and 2 of them (-4 and 4) produce a change of direction. If you want exactly 25%, there'll definitely be a way - just fiddle with the algebra a bit.

[Wodjanoi]

I came to the same solution yesterday, but I decided to stay away from the 25% chance, because it wasn't
really necessary for the desired result as I thought first.
Thanks a lot for the detailed explanation Volnaiskra! Actually I was a bit confused that I got it working using the direction values in the random expression like this.