ladder_swerve_jump.1

-- ladder_swerve_jump.1
-- For use with this: http://www.computercraft.info/forums2/index.php?/topic/23785-virtual-parkour/

--Get what the main program is telling us to do
local args={...};

local trans = {{["x+"]=5, ["x-"]=4, ["z+"]=3, ["z-"]=2},
        {["x+"]=3, ["x-"]=2, ["z+"]=4, ["z-"]=5},
        {["x+"]=2, ["x-"]=3, ["z+"]=5, ["z-"]=4},
        {["x+"]=4, ["x-"]=5, ["z+"]=2, ["z-"]=3}}

--If it wants to know how much probability we have to be chosen when selecting the next structure
if args[1]=="weight" then
    return 0.3;

--If it wants us to build the structure,
elseif args[1]=="build" then
    --Get the angle the last structure had
    local lastAngle=args[2];

    --Get a random height difference for the block we are going to place in relation to the last block, from -2 to 1
    local hdif;
    local r=math.random();
    if r>0.66666 then   hdif=1;
    elseif  r<0.22222 then  hdif=-1;
    elseif  r<0.33333 then  hdif=-2;
    else                    hdif=0;
    end

    --Get the distance between the last block and the one we are gonna place, depending on the height difference (if the block is lower you can jump farther)
    local dist;
    if hdif==1 then dist=4.9;
    elseif hdif==-1 then dist=5.9;
    elseif hdif==-2 then dist=6.5;
    elseif hdif==0 then dist=5.7;
    end

    --Get the new angle, which is (+-)0.3PI from the previous angle (lastAngle)
    local ang=lastAngle-math.pi*0.3+math.random()*math.pi*0.6;

    --Get the radius of our areaCheck sphere depending on the height difference
    local sphere;
    if hdif==-2 then sphere=7;
    elseif hdif==-1 then sphere=6;
    else sphere=5; end

    --Create our setblock parameters and place them in a table
    local b1={
        math.floor(0.5+math.cos(ang)*dist),
        hdif,
        math.floor(0.5+math.sin(ang)*dist),
        "minecraft:stone",
    };
    local b1lad1={
        b1[1]-1;
        b1[2],
        b1[3],
        "minecraft:ladder",
    };
    local ladderOffset=numberToDir(dirToNumber(final().next)+2);
    b1lad1[5]=trans[1][ladderOffset];

    local b1lad2={
        b1[1],
        b1[2],
        b1[3],
        "minecraft:ladder",
    };

    if b1[3]>0 then --To the right, ladder on left
        b1lad2[3]=b1lad2[3]-1;
        b1lad2[5]=trans[2][ladderOffset];
    else            --To the left, ladder on right
        b1lad2[3]=b1lad2[3]+1;
        b1lad2[5]=trans[3][ladderOffset];
    end

    local b2 = {
        b1[1],
        b1[2] + 1,
        b1[3],
        "minecraft:stone",
    };

    local b2lad1={
        b2[1]+1;
        b2[2],
        b2[3],
        "minecraft:ladder",
    };
    local ladderOffset=numberToDir(dirToNumber(final().next)-2);
    b2lad1[5]=trans[4][ladderOffset];

    local b2lad2={
        b2[1],
        b2[2],
        b2[3],
        "minecraft:ladder",
    };

    if b1[3]<0 then --To the right, ladder on left
        b2lad2[3]=b2lad2[3]-1;
        b2lad2[5]=trans[2][ladderOffset];
    else            --To the left, ladder on right
        b2lad2[3]=b2lad2[3]+1;
        b2lad2[5]=trans[3][ladderOffset];
    end

    local b3 = {
        b2[1],
        b2[2] + 1,
        b2[3],
        "minecraft:stone",
    };

    --Return the StructureTable, with everything it needs to have
    return {
        blocks={b1,b1lad1,b1lad2,b2,b2lad1,b2lad2,b3},      --The blocks table contains 1 element: the floating block
        areaCheck={{b2[1],b2[2],b2[3],sphere}}, --The areaCheck table also only contains 1 element, our floating block area check.
        exit={b3[1],b3[2],b3[3]},                   --The exit of this structure is this same block
        next=ang,                               --Tell the next structure our angle was this
        length=15,                              --This structure is 15% a total checkpoint-to-checkpoint parkour section in normal difficulty
    };
end