Parameters / Action 7

[andythenorth]

I am having a little (big) trouble with parameters and action 7.

The intention is to use an action 7 to skip a sprite if the parameter value doesn't match x (in this case x = 2, but that's not significant)

This code doesn't work (checking param 0 as a dword - TTDPatch wiki says params are 4 bytes)

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  252 * 9	 07 \b00 04 \7! \d02 \b01 // skip one action, if the parameter doesn't match.

Nor does this (checking param 0 as a byte).

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  252 * 9	 07 \b00 01 \7! \b02 \b01 // skip one action, if the parameter doesn't match.

In both cases, the value of the first parameter is set to 2 in the newgrf gui window.

This however does work (setting the value of param 0 with an action D)

Using the action D is just a test to prove that the action 7 is not fundamentally wrong.

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  251 * 9	 0D \b00 \D= FF FF \d02 // force the value of param 0 to be 2 
  252 * 9	 07 \b00 04 \7! \d02 \b01 // skip one action, if the parameter doesn't match.

So the problem appears to be isolated to reading a parameter set by the player.

I'm sure I'm doing something stupid

cheers,

Andy

[OzTrans]

...

[PikkaBird]

Action 7 is only executed during GRF activation, so setting the parameter in a running game will not work.

Alternatively, make sure there's no Action D setting the parameter further up in the GRF.

[andythenorth]

Alternatively, make sure there's no Action D setting the parameter further up in the GRF.

That was it. Sorted now, thanks.

Collaborative development with one author unavoidably out of contact...these things happen

[DaleStan]

I'm sorry, I only speak NFO

That is NFO. Or, at least, so say both NFORenum and GRFCodec.