LFS Forum - G Force Output Button

#1 - sinanju

G Force Output Button

Thu, 21 Oct 2010 20:35

I was reading forum earlier about someone wanting a way to measure and show gforce (http://www.lfsforum.net/showthread.php?p=1502458#post1502458) and I wondered if it could be done with lapper.

Well, it can!

Assuming my maths is correct, the code is as follows:



<?php 
Event OnAcceleration( $userName )

$AccelerationStartSpeedMph = 1; # At which speed to start measuring time. In Mph
$AccelerationEndSpeedMph = 60; # At which speed to stop measuring time. In Mph
$AccelerationStartSpeed = 1; # At which speed to start measuring time. In km/h
$AccelerationEndSpeed = 100; # At which speed to stop measuring time. In km/h

$gravity_mph = 21.93685; # An acceleration of 21.93685 mph per second is equal to 1g (0 - 100 mph in 1 second = 4.56g)
$gravity_kph =35.30394; # An acceleration of 35.30394 kp/h per second is equal to 1g

$ass = GetCurrentPlayerVar("AccelerationStartSpeed"); # Starting speed
$aes = GetCurrentPlayerVar("AccelerationEndSpeed"); # End speed
$at = GetCurrentPlayerVar("AccelerationTime"); # Acceleration time achieved from start to end speed
$us = GetCurrentPlayerVar("UnitSpeed"); # Unit of the speed of the player's car

$gforce_velocity_difference = ($aes - $ass);
$gforce_accel = $gforce_velocity_difference/$at;
$gforce_mph = round(($gforce_accel/$gravity_mph),2);
$gforce_kph = round(($gforce_accel/$gravity_kph),2);

IF ($us = "mph")
THEN
         openPrivButton( "gforce",77,60,46,8,5,5,32,langEngine("%{main_gforce}%",$gforce_mph ));        
ELSE
         openPrivButton( "gforce",77,60,46,8,5,5,32,langEngine("%{main_gforce}%",$gforce_kph ));
ENDIF                                                                                                 
EndEvent
?>

And don't forget to put following in your language file;



<?php 
LANG "EN"
main_gforce =  "^7You pulled ^1{0} ^7g's";
EndLang
?>

If you want to make increase or decrease the number of decimal places, (above code outputs to 2), so change the number at end of $gforce_mph and $gforce_kph to suit. If you take away the round() function, it gives 5 or 6 decimal places.

Also, not sure, but I suppose it's possible (but beyond me) to save the gforce "scores" in one of the lapper databases and output as a table to show best/highest gforce.

txt attachement is for my workings out - NOT lapper code.

Aide Memoir:
gravity = 9.80665 metres per second

9.80665 m/s = 21.936851 mph or 35.30394 km/h

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#2 - Dygear

Thu, 21 Oct 2010 22:45

I implemented this in PRISM, your math is pretty close, enough for it to work.



<?php 
php
class gmeter extends Plugins {
    const NAME = 'G-Force Meter';
    const AUTHOR = "sinanju & Dygear";
    const VERSION = '0.1.0';
    const DESCRIPTION = 'Shows a G-Force meter.';

    private $MPH = 21.93685;    # 1G = An acceleration delta of 21.93685 mph/second.
    private $KPH = 35.30394;    # 1G = An acceleration delta of 35.30394 kph/second.

    private $BTNs = array();
    private $TIMEs = array();
    private $SPEEDs = array();

    public function __construct() {
        $this->registerPacket('onMCI', ISP_MCI);
    }
    public function onMCI($Packet) {
        $cTime = microtime(TRUE);
        foreach ($Packet->Info as $CompCar) {
            // Spawn a new button instance if one is not here.
            if (!isset($this->BTNs[$CompCar->PLID])) {
                $this->BTNs[$CompCar->PLID] = new IS_BTN;
                $this->BTNs[$CompCar->PLID]->T(184)->L(164)->W(10)->H(6)->BStyle(ISB_DARK + ISB_RIGHT + 1)->Send();
                $this->BTNs[$CompCar->PLID]->W(0)->H(0);
            }
            
            // Speeds
            $cSpeed = (($CompCar->Speed / 32768) * 100) * 2.2369362920544;
            $lSpeed = (isset($this->SPEEDs[$CompCar->PLID])) ? $this->SPEEDs[$CompCar->PLID] : 0;

            // Times
            $lTime = (isset($this->TIMEs[$CompCar->PLID])) ? $this->TIMEs[$CompCar->PLID] : 0;

            // Get gForce
            $gForce = round(($cSpeed - $lSpeed) / ($cTime - $lTime) / $this->MPH, 2);

            // Update Button
            $this->BTNs[$CompCar->PLID]->Text(sprintf('%.2f', $gForce))->Send();
            
            // Save State
            $this->TIMEs[$CompCar->PLID] = $cTime;
            $this->SPEEDs[$CompCar->PLID] = $cSpeed;
        }
    }
}
?>

#3 - sinanju

Thu, 21 Oct 2010 22:50

Also made a circular gforce button.

Might get in way of seeing where you're going a bit though.

You will need to unzip the gbutton.zip file and extract gbutton.lpr.

This is an add-on script, so put in your /includes folder and alter your addonsused.lpr script by adding following line;

include( "./gbutton.lpr");

EDIT: Thanks Dygear - I must have been typing this as you were loading your post

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