calculating position in reverse gear of car

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hi everyone
I want to write a program that simulate a car .
I have a problem with calculating position in the reverse gear

this is my code in forward gear:
theta is the angle of wheels of the car
-45<angle<45
primary position of car is in (800,500) in the form
if (gearState() == 1)//forward gear
{
position.X += (Int32)(speed() * Math.Sin(theta * Math.PI / 180));
position.Y -= (Int32)(speed() * Math.Cos(theta * Math.PI / 180));
}
this code work very good but doesn't work in reverse gear.
when theta=20 and car is in reverse gear car goes to the left instead of going right
do you have any idea ?
please help me

Posted 1-Jul-10 21:15pm

fika_fa

Updated 8-Aug-18 23:21pm

v3

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CPallini · Accepted Answer · 2010-07-01T21:30:00

Solution 1

Assuming your car dimensionless (and speed() positive), shouldn't

C++

if (gearState() == -1)//reverse gear
{
   position.X += (Int32)(speed() * Math.Sin(theta * Math.PI / 180));
   position.Y <big>+=</big> (Int32)(speed() * Math.Cos(theta * Math.PI / 180));
}

do the trick?
:)

Posted 1-Jul-10 21:30pm

CPallini

Comments

fika_fa 2-Jul-10 13:21pm

your code doesn't work !
my car is a picture that moving on 2d screen

CPallini 2-Jul-10 14:22pm

What do you mean, exactly, with 'doesn't work'? What is the expected behaviour? What is the observed behaviour? Are the prerequisites satisfied (i.e. irrelevant car dimensions, positive speed)?