First copy the below function into your map's Custom Script Header:
JASS:
function CreateRandomForest takes rect area, real density, integer treetype, integer variations returns nothing
local real x
local real y = GetRectMinY(area)
local real width = GetRectMaxX(area)-GetRectMinX(area)
local real height = GetRectMaxY(area)-GetRectMinY(area)
local integer maxX = R2I(width*density*GetRandomReal(1, 1.4)/128)
local integer maxY = R2I(height*density*GetRandomReal(1, 1.4)/128)
local integer countX
local integer countY = 0
loop
exitwhen countY >= maxY
set x = GetRectMinX(area)
set countX = 0
loop
exitwhen countX >= maxX
call CreateDestructable(treetype, x+GetRandomReal(-256, 256), y+GetRandomReal(-256, 256), GetRandomDirectionDeg(), GetRandomReal(0.9, 1.1),GetRandomInt(1, variations))
set x = x + width/maxX * GetRandomReal(0.9, 1.1)
set countX = countX+1
endloop
set y = y + height/maxY * GetRandomReal(0.9, 1.1)
set countY = countY+1
endloop
endfunction
As for using this function, you'll first need to create a rect (a region) somewhere on the map in which to create the trees. Let's assume you call it "Tree Rect".
Next, you'll need to call the function. The first argument (
...takes rect area... is where you specify the above rect using it's global variable. The name of the variable is always
gg_rct_+The Name of the Rect. So in this example you'd use
gg_rct_Tree_Rect.
Next, you have to specify a density which must be between 0.00 and 1.00; 0.00 being completely empty and 1.00 being jam-packed with trees.
The third argument is that of the rawcode of the destructible you want to create. To find this rawcode, go into the Object editor and press Command+D to display rawcodes. Then input the rawcode you want when you call the function like so:
'D004' (the apostrophes are necessary).
The final argument is that of number of variations. This is usually used for trees/environmental doodads that can have as many as 10 or 11 different variations. The number you put into this argument will determine the highest numbered variation that the destructibles will be created as.
That's it, and example of how you might call the function would be as follows:
Events
Map Initialization
Conditions
Actions