En:St-black/whiteballs

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st-blackballs und st-whiteballs

The two stones st-blackballs and st-whiteballs can do much more than what is immediately obvious. They can process a signal sent to them in a certain way and send a signal out again.

There is a kind of application, which you find several times. A grid of doors is laid out, which open and close according to certain rules when touching these stones. Into the field, which is surrounded by 4 doors, a st-blackballs (or st-whiteballs) is put. Then the touched door opens, and the perpendicularly neighboring doors close.

The following piece of code generates such grids:

--- GRIDCODE -------------------------------------------------------------------
function set_ballstones(x0,y0,w,h,black)
    if black == 1 then
        stone = "st-blackballs"
    else
        stone = "st-whiteballs"
    end
    for i=0, h do
        for j=0, w do
            set_stone(stone,x0+2*j,y0+2*i)
        end
    end
end 
 
function set_sensors(x0,y0,w,h,type)
    if type == 1 then
        sensor = "it-sensor"
    else
        sensor = "it-inversesensor"
    end
    local i,j
    local c = 0
    for i=0, h do
        for j=0, w-1 do
            set_stone("st-door-h",x0+1+2*j,y0+2*i)
            set_item(sensor,x0+1+2*j,y0+2*i)
            dostring("Signal(\"it("..tostring(x0+1+2*j).." "..tostring(y0+2*i)..")\",\"st("..tostring(x0+2*j).." "..tostring(y0+2*i)..")\")")
            dostring("Signal(\"it("..tostring(x0+1+2*j).." "..tostring(y0+2*i)..")\",\"st("..tostring(x0+2+2*j).." "..tostring(y0+2*i)..")\")")
            c = c+1
        end
    end
 
    for i=0, h-1 do
        for j=0, w do
            set_stone("st-door-v",x0+2*j,y0+1+2*i)
            set_item(sensor,x0+2*j,y0+1+2*i)
            dostring("Signal(\"it("..tostring(x0+2*j).." "..tostring(y0+1+2*i)..")\",\"st("..tostring(x0+2*j).." "..tostring(y0+2*i)..")\")")
            dostring("Signal(\"it("..tostring(x0+2*j).." "..tostring(y0+1+2*i)..")\",\"st("..tostring(x0+2*j).." "..tostring(y0+2+2*i)..")\")")
            c = c+1
        end
    end
end
 
-- Wrapper:
function set_grid(x0,y0,w,h,black,type)
    set_ballstones(x0,y0,w,h,black)
    set_sensors(x0,y0,w,h,type)  
end
--- END GRIDCODE ---------------------------------------------------------------

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Analysis

The grid consists of a lattice of st-blackballs (or st-whiteballs) and between 2 such stones in each case a horizontal or vertical door (st-door). On the same field as the door it also has a sensor item (it-sensor).

Now if the door is struck, the item on the same field implements its Action/target pair. (This is a special characteristic of doors!)

Now the sensor sends a signal to the two stones that form the door jambs. These distribute the signal (if it comes from the ball colour to which they also belong) to the 4 adjacent doors. These doors are then accordingly opened or closed.

A level that makes use of the code above could look something like this: