How to have 2 items/blocks on the same tile?

I have seen many maps with bushes underwater, and in the same tile water...
I wonder how they do it.

 

on gimp

 

Water will fill in the tile with the bush on it upon loading the map. This works the same with any object or tile placed in water. Unfortunately, there is no way to place a block with a background behind it, with exception to dirt.

 

that's weird, I have seen caves with bushes(background dirt behind them)

 

Dirt backgrounds are kinda weird. It seems like the game fills in dirt backgrounds if the item/tile/object is surrounded by dirt background. However, this doesn't work all the time, and not for all items.

 

aha

--- Double Post Merged, Jan 26, 2014, Original Post Date: Jan 26, 2014 ---

also, i have seen bushes in grass...or flowers

 

You can add your own colors on the PNG loader and make it spawn several blobs/tiles. There was another method I don't know about, I believe you gave a file the coords/name of the blob to spawn it.
Anyway, hope that helped!

 

I didn't understand anything you just said...

 

Basically, the png images don't "load themselves", there is a file under Scripts>MapLoaders>BasePNGLoader, which has colors and tells the game to spawn certain blobs/tiles at those colors.
But really, you could do anything when a color appears. For example, if there is pure black on the png map, then you could make it so there's only archers by changing certain variables... etc etc. My point is, you can add to those colors, or modify the existing ones to spawn any blob OR combination of blobs you want, for example, a catapult with wood background behind it.

 

Now I understand, but how to change these variables?

 

Basically, you would store a variable under CRules, for example, 1 if you want knights only, 0 for all classes, and then you would, to put it simply, make it check if that variable is 1, and if it is, don't add archer and builder to the change class menu. Oh, and kill all player tagged archer or builder.

 

I wish I new c++, but I know only a bit python :3

 

http://www.cplusplus.com/files/tutorial.pdf
Do it. You know you want to.

 

Maybe, but I cant have to code languages in my head, so I will have to leave python, but I can try

 

You can also try looking at LUA, it has a lot of similarities, like "for" loops. I don't think it has arrays or pointers so it's a bit easier.
There's a mod for it in Minecraft called Computercraft, which uses it, if you're into that -if you are, I suggest looking at the FTB modpack. It's pretty fun :D.