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14.1 Creating a BSP tree
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First, you have to create the root node of the tree. This node encompasses the whole rectangular region.

C++ : TCODBsp::TCODBsp(int x,int y,int w, int h)
C   : TCOD_bsp_t *TCOD_bsp_new_with_size(int x,int y,int w, int h)
Py  : bsp_new_with_size(x,y,w, h)

Parameter	Description
x,y,w,h	Top left corner position and size of the rectangular region covered by the BSP tree.

Example :

C++ : TCODBsp *myBSP = new TCODBsp(0,0,50,50);
C   : TCOD_bsp_t *my_bsp=TCOD_bsp_new_with_size(0,0,50,50);
Py  : my_bsp=libtcod.bsp_new_with_size(0,0,50,50)

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