Stuff

#include <a_samp>

new keydown[MAX_PLAYERS] = {false, ...};
new rampid[MAX_PLAYERS] = {-1, ...};
forward Keys()
forwars RemoveRamp(playerid)
forward Float:GetOptimumRampDistance(playerid);
forward Float:GetXYInFrontOfPlayer(playerid, &Float:x, &Float:y, Float:distance);

new ramptypes[] = {
	1503, // curvy normal one
	1660, // concrete one with pipes
	1245, // plank of wood against a box
	1631, // water ramp with rocks
	1632, // normal water ramp
	1655, // wide water ramp
};

new playerramptypes[MAX_PLAYERS] = {0, ...};

public OnFilterScriptInit()
{
	SetTimer("Keys", 100, 1);
	return 1;
}

public Keys()
{
	new keys, updown, leftright, playerid;
	new Float:x, Float:y, Float:z, Float:angle;
	for (playerid = 0; playerid < MAX_PLAYERS; playerid++) {
	    if (IsPlayerConnected(playerid)) {
			GetPlayerKeys(playerid, keys, updown, leftright);
			if (keys & KEY_ACTION && IsPlayerInAnyVehicle(playerid)) {
				if (!keydown[playerid]) {
					keydown[playerid] = true;
					if (rampid[playerid] == -1) {
					    GetPlayerPos(playerid, x, y, z);
					    angle = GetXYInFrontOfPlayer(playerid, x, y, GetOptimumRampDistance(playerid));
					    switch (playerramptypes[playerid]) {
							case 2:
							{
					        angle -= 90.0;
					        if (angle < 0.0) angle += 360.0;
					        z += 0.5;
					        }
					        case 1:
					        {
					            z -= 0.5;
					        }
					    }
					    rampid[playerid] = CreateObject(ramptypes[playerramptypes[playerid]], x, y, z - 0.5, 0.0, 0.0, angle);
					    SetTimerEx("RemoveRamp", 2000, 0, "d", playerid);
				    }
			    }
			} else keydown[playerid] = false;
		}
	}
}

public OnPlayerCommandText(playerid, cmdtext[])
{
	if (strcmp("/setramp ", cmdtext, true, 9) == 0)
	{
		new ramp = strval(cmdtext[9]);
		if (ramp < 0 || ramp >= sizeof(ramptypes)) {
		    SendClientMessage(playerid, 0xFFFFFFAA, "Invalid ramp ID.");
		} else {
			playerramptypes[playerid] = ramp;
		}
	    return 1;
	}
	return 0;
}

public RemoveRamp(playerid)
{
	if (rampid[playerid] != -1) {
	    DestroyObject(rampid[playerid]);
	    rampid[playerid] = -1;
	}
}

public OnFilterScriptExit()
{
	for (new i=0; i<MAX_PLAYERS; i++)
	{
		if (rampid[i] != -1) DestroyObject(rampid[i]);
	}
}

Float:GetOptimumRampDistance(playerid)
{
	new ping = GetPlayerPing(playerid), Float:dist;
	dist = floatpower(ping, 0.25);
	dist = dist*4.0;
	dist = dist+5.0;
	return dist;
}

Float:GetXYInFrontOfPlayer(playerid, &Float:x, &Float:y, Float:distance)
{
	new Float:a;
	GetPlayerPos(playerid, x, y, a);
	if (IsPlayerInAnyVehicle(playerid)) GetVehicleZAngle(GetPlayerVehicleID(playerid), a);
	else GetPlayerFacingAngle(playerid, a);
	x += (distance * floatsin(-a, degrees));
	y += (distance * floatcos(-a, degrees));
	return a;
}