14-10-2003 03:14									#1
	Does anybody know how the GetNearestWater function work? Support Apolyton buy from Amazon

Acording to the slic documentation it takes two arguments. I was able to verify this. Also according to the slic documentation both arguments are location variables. Unfortunatly if I give it two locations I get a bounce message windows box in SlicDebug mode: Wrong Type of Argument.

OK while I was writing I had to test something and I figured out something more, so my question is at least anwered partly:

If I use something like this I get the windows bounce messege:

location_t MGLoc;
GetNearestWater(army[0].location, MGLoc);

But if I use this, I don't get a bounce message:

location_t MGLoc;
GetNearestWater(army[0].location, MGLoc.location);

The only problem is the function know returns the distance to that tile but it doesn't fill the location variable.

-Martin

	14-10-2003 04:53									#2
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You got further than me. My notes just say "Must be broken, keeps giving 'wrong type of argument' errors."

	14-10-2003 20:44									#3
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Well at least I can use it for determining the direction of the water tile. And it can be used to know whether the location is a water tile or not:

if(GetNearestWater(army[0].location, MGLoc.location) > 0){
// --> army[0].location is land
}
if(GetNearestWater(army[0].location, MGLoc.location) == 0){
// --> army[0].location is sea
}

-Martin

	15-10-2003 18:47									#4
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How do you determine the direction of the water tile? You said it returned the distance - did you mean that? If you can obtain the direction you can iterate to find the nearest water tile (or at least something close to it).

	15-10-2003 19:16									#5
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quote: Originally posted by J Bytheway How do you determine the direction of the water tile? You said it returned the distance - did you mean that? If you can obtain the direction you can iterate to find the nearest water tile (or at least something close to it).

It does return the Distance as advertised. If you look on the distance of the neigbour tiles, you can find the direction, becaus ethe neighbor that lies in the same direction is close to the water tile. Well I already had before a function that can find the direction of one tile respective of another tile. So the function looks like this:

code:

////////////////////////////////////////////////////////
//MG_GetWaterDirection                                //
//                                                    //
//Parameter: location_t startLoc                      //
//                                                    //
//Return Value:                                       //
//The direction in that the nearest water tile of     //
//startLoc lies. Or if startLoc is a water tile it    //
//returns 8.                                          //
//                                                    //
//Remarks:                                            //
//none                                                //
////////////////////////////////////////////////////////

int_f MG_GetWaterDirection(location_t startLoc){
	location_t MGLoc;
	location_t MGStartLoc;
	location_t MGDummyLoc;
	MGStartLoc = startLoc;
	int_t MGDistance;
	int_t MGNewDistance;
	int_t MGDirection;
	int_t j;
	//GetNearestWater should fill MGDummyLoc with location of the nearest water tile
	//but in fact it is not filled, the function returns only the distance of that tile.
	MGDistance = GetNearestWater(MGStartLoc.location, MGDummyLoc.location);
	if(MGDistance == 0){
		return 8;
	}
	for(j = 0; j < 8; j = j + 1){
		GetNeighbor(MGStartLoc, j, MGLoc);
		MGNewDistance = GetNearestWater(MGLoc.location, MGDummyLoc.location);
		if(MGNewDistance < MGDistance){
			MGDistance = MGNewDistance;
			MGDirection = j;
		}
	}
	return MGDirection;
}

	15-10-2003 23:16									#6
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Clever . So you can write a function to obtain a nearest water tile by repeating the above process until you reach water. Of course, this is likely to be relatively slow, but perhaps not too bad. You could of course save the information in an array for any tile you need to calculate so that you never repeat the calculation for that tile, but it probably wouldn't be worthwhile to.

	15-10-2003 23:17									#7
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code:

location_t TheWatersEdge;

Functional_GetNearestWater(location_t startLoc)
{
// assuming there is water on the map...
location_t theLoc;
location_t theOtherLoc;
int_t i;
theLoc = startLoc;
     while(GetNearestWater(army[0].location, MGLoc.location) > 0){
         i = MG_GetWaterDirection(theLoc);
         GetNeighbor(theLoc,i,theOtherLoc);
         theLoc = theOtherLoc;
    }
    TheWatersEdge = theLoc;
}

	15-10-2003 23:20									#8
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x=-post

	15-10-2003 23:22									#9
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Indeed - I just came back to raise the question of what happens when there is no water, but you beat me to it .

	16-10-2003 20:21									#10
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quote: Originally posted by J Bytheway Indeed - I just came back to raise the question of what happens when there is no water, but you beat me to it .

In that case GetNearestWater(army[0].location, MGLoc.location) returns 0 and not -1 as I expected. So it is not the best way to figure out wheather you have to do it with a land or a sea tile.

-Martin

	17-10-2003 03:21									#11
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Do a terrain check on a known land tile (like under a city) beforehand.

	17-10-2003 19:08									#12
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Under a city might not be the best choice - I can concieve of scenarios that start you with sea cities rather than land ones.

I thought that there was a function to check terrain types - I know I used one in CTP1, surely that must be a faster way to check whether a tile is water or not.

	17-10-2003 19:56									#13
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quote: Originally posted by J Bytheway Under a city might not be the best choice - I can concieve of scenarios that start you with sea cities rather than land ones. I thought that there was a function to check terrain types - I know I used one in CTP1, surely that must be a faster way to check whether a tile is water or not.

So there is such a function in CTP1. If this is true and the function is still in CTP2 than Peter and I weren't able to find it.

-Martin

	18-10-2003 16:02									#14
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If I were using my own computer I'd have a look now and see what it was, but I can't. I'll try and remeber to do so the next time I can and get back to you.

	19-10-2003 16:04									#15
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Yep, there was, and it was called TerrainType. e.g. I used

code:
if (TerrainType(city.location) == 13)

	19-10-2003 17:22									#16
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Ahh, now I remember:

code:

int_f CTC_IsSeaTerrain(location_t theLoc){

    location_t tmpLoc;
    tmpLoc=theLoc;
    if ((9 < TerrainType(tmpLoc) && TerrainType(tmpLoc) < 17) 
|| TerrainType(tmpLoc)==22 || TerrainType(tmpLoc) ==23 ){
         return 1;
    }
    return 0;

}

	19-10-2003 19:10									#17
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quote: Originally posted by J Bytheway Yep, there was, and it was called TerrainType. e.g. I used code: if (TerrainType(city.location) == 13) to test for space cities. I doubt that you could have missed that if it still existed, though.

Well here is my MG_IsLand function:

code:

int_f MG_IsLand(location_t theLoc){
location_t MGLoc;
MGLoc = theloc;
	return((TerrainType(MGLoc)<=9)
	||((TerrainType(MGLoc)>=18)
	&& (TerrainType(MGLoc)<=21))
	);
}

	19-10-2003 21:36									#18
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Hmm... I see the problem.

Perhaps you should try GetNearestWater on a sea city tile and see whether it returns 1 or 0 - If it is being treated as land as you say then it might return 1 and then you can indeed test whether there is any water on the map by using GetNearestWater on the capital city.

	20-10-2003 02:12									#19
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You can in place of numbers use the DB-references in that function:

code:

if(TerrainType(tmpLoc) == TerrainDB(TERRAIN_PLAINS)){

	29-10-2003 01:27									#20
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Looks like GetNearestWater scans the whole map for water tiles and returns finally the shortest distance.

-Martin