A_JumpIf question

carlcyber · Post by **carlcyber** » Fri Oct 20, 2006 11:33 am

After reading the introduction about A_JumpIf in the wiki. I still don't understand how to write the expression for it.
For example, how do I identify the x coordinate is larger 1024 and then jumps a specified state number?
Another question is, what is "pitch" in the A_JumpIf wiki page?

HotWax · Post by **HotWax** » Fri Oct 20, 2006 12:48 pm

carlcyber wrote:After reading the introduction about A_JumpIf in the wiki. I still don't understand how to write the expression for it.
For example, how do I identify the x coordinate is larger 1024 and then jumps a specified state number?

This will jump 4 frames ahead if the x coordinate is larger than 1024:

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TNT1 A 0 A_JumpIf(x > 1024, 4);

Another question is, what is "pitch" in the A_JumpIf wiki page?

The pitch is the Z-angle (up/down) which the actor in question is currently facing. I believe this may only be useful for players, but maybe projectiles store this value as well? Somebody more knowledgable with DECORATE could probably clarify.

Electronic Samurai · Post by **Electronic Samurai** » Fri Oct 20, 2006 2:34 pm

Along the same lines, what sort of math can DECORATE handle? Does it support, for example, sine functions? Logical operators?

carlcyber · Post by **carlcyber** » Fri Oct 20, 2006 7:11 pm

Thanks, HotWax.
And I'm curious about Electronic Samurai's question, too.

solarsnowfall · Post by **solarsnowfall** » Fri Oct 20, 2006 7:21 pm

I've always thought the documentation on that function was a bit lacking.

Grubber · Post by **Grubber** » Sat Oct 21, 2006 1:13 am

Operators: ~a, !a, -a, a * b, a / b, a % b, a + b, a - b, a << b, a >> b, a < b, a <= b, a > b, a >= b, a == b, a != b, a & b, a ^ b, a | b, a && b, a || b, a ? b : c

Functions: random (min, max), sin (angle), cos (angle), any action special

Post by **Bio Hazard** » Sat Oct 21, 2006 1:36 am

No XOR logical operator?

Grubber · Post by **Grubber** » Sat Oct 21, 2006 2:07 am

No, only standard C operators. After all, there's no need for logical XOR operator, != is equivalent with it.

Post by **Graf Zahl** » Sat Oct 21, 2006 3:13 am

No, it isn't.

(1 ^^ 2) ==0
(1 != 2) == 1

But I don't know any language that implements that operator. It's easy enough to replicate with other operators.

Zippy · Post by **Zippy** » Sat Oct 21, 2006 10:26 am

Grubber wrote:sin (angle), cos (angle)

Is angle represented as a byte angle, fixed point angle, or as 360 degrees?

Post by **Bio Hazard** » Sat Oct 21, 2006 3:35 pm

Um, wouldn't

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if(i ^^ q){

evaluate true if either i OR q were true but not if both were true? The only way I can think to do that with other operators is with

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if((i && !q) || (!i && q)){

Hmm, I could have sworn I'd seen it in C somewhere but I guess you're right.

Post by **Graf Zahl** » Sat Oct 21, 2006 3:58 pm

Code: Select all

if (!!i ^ !!q) ...

Post by **Bio Hazard** » Sat Oct 21, 2006 4:03 pm

That's still more text (and instructions) than

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if(i^^q)

Siggi · Post by **Siggi** » Sat Oct 21, 2006 4:05 pm

Because 3 more key strokes is a work out.

HotWax · Post by **HotWax** » Sat Oct 21, 2006 4:59 pm

Graf Zahl wrote:
Code: Select all
if (!!i ^ !!q) ...

"If not not i or not not q"?

What?

<brain explodes>

Welcome to ZDF!

A_JumpIf question

A_JumpIf question

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