CreateLadder

#include <a_samp>

#define MAX_LADDERS 10

enum LadderI_Info
{
    Float:Height,
    Float:pX,
    Float:pY,
    Float:pZ
}

new
    LadderInfo[MAX_LADDERS][LadderI_Info],
    DownLadder[MAX_PLAYERS],
    ladders;

stock CreateLadder(type, Float:x, Float:y, Float:z, Float:rx, Float:ry, Float:rz)
{
    CreateObject(!type ? (1428) : (1437), x, y, z, rx, ry, rz);
    LadderInfo[ladders][pX] = x;
    LadderInfo[ladders][pY] = y;
    LadderInfo[ladders][pZ] = z;
    LadderInfo[ladders][Height] = !type ? (2.4402) : (5.8024);
    return (++ladders - 1);
}

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys & KEY_SUBMISSION)
    {
        if(!DownLadder[playerid] && !IsPlayerInAnyVehicle(playerid))
        {
            for(new i; i < ladders; ++i)
            {
                if(IsPlayerInRangeOfPoint(playerid, 1.0, LadderInfo[i][pX], LadderInfo[i][pY], LadderInfo[i][pZ] + (LadderInfo[i][Height] / 2)))
                {
                    return DownLadder[playerid] = SetTimerEx("OnPlayerDownLadders", 30, true, "ddd", playerid, i, _:true);
                }
                else if(IsPlayerInRangeOfPoint(playerid, 1.0, LadderInfo[i][pX], LadderInfo[i][pY], LadderInfo[i][pZ] - (LadderInfo[i][Height] / 2)))
                {
                    return DownLadder[playerid] = SetTimerEx("OnPlayerDownLadders", 30, true, "ddd", playerid, i, _:false);
                }
            }
        }
    }
    return true;
}

forward OnPlayerDownLadders(playerid, ladderid, down);
public OnPlayerDownLadders(playerid, ladderid, down)
{
    new
        Float:p[3],
        Float:angle;

    GetPlayerPos(playerid, p[0], p[1], p[2]);
    GetPlayerFacingAngle(playerid, angle);

    if(down)
    {
        p[0] -= floatsin(-angle, degrees);
        p[1] -= floatcos(-angle, degrees);
        p[2] -= 0.500000;
    }
    else
    {
        p[0] += floatsin(-angle, degrees);
        p[1] += floatcos(-angle, degrees);
        p[2] += 0.500000;
    }

    SetPlayerPos(playerid, p[0], p[1], p[2]);

    if(down)
    {
        if((p[2] + 0.500000) >= (LadderInfo[ladderid][pZ] + (LadderInfo[ladderid][Height] / 2)))
        {
            return KillTimer(DownLadder[playerid]);
        }
    }
    else
    {
        if((p[2] + 0.500000) <= (LadderInfo[ladderid][pZ] - (LadderInfo[ladderid][Height] / 2)))
        {
            p[0] += floatsin(-angle, degrees);
            p[1] += floatcos(-angle, degrees);

            SetPlayerPos(playerid, p[0], p[1], p[2] - 0.500000);

            return KillTimer(DownLadder[playerid]);
        }
    }
    return true;
}