Re: basic help

Nice! Why didn't I figure that out. Of course the getHeadingRadians() and 
getGurnHeadingRadians() should be used. :-)
That was the reason why it was so hard to find the error in your code. 
Right mathematics, but wrong methods regarding degrees versus radians. =)

Thanks for sharing the updated version for reference. I will keep that in 
mind. :-)

Cheers,
- Flemming

Den mandag den 5. maj 2014 02.06.02 UTC+2 skrev Tomás Abril:
>
> Hello flemming,
> thanks for the reply.
> I just changes everything from pure angles(degrees) to radians and it is 
> now working!. The magic of pi it seems.
> I was probably treating degrees as normal (scalar?) numbers at some point 
> but coudn't find where.
> Before I was also not properly using the scanner separate from the gun.
>
> Here is the code for future reference:
> before:
>
>
>         public void onScannedRobot(ScannedRobotEvent e) {
>
>                 // calculate firepower based on distance
>                 double firePower = Math.min(500 / e.getDistance(), 3);
>                 // calculate speed of bullet
>                 double bulletSpeed = 20 - firePower * 3;
>
>                 double absoluteBearing = getHeading() + e.getBearing();
>                 double eLateralVelocity = e.getVelocity() * Math.sin(e.getHeading() - absoluteBearing);
>                 double offset = Math.asin(eLateralVelocity/bulletSpeed);
>                 turnGunRight(normalize( absoluteBearing - getGunHeading() + offset ));
>
>            // if the gun is cool and we're pointed at the target, shoot!
>            if ( getGunHeat() == 0 && Math.abs(getGunTurnRemaining()) < 10 ) {
>                       fire(firePower);
>                 }
>
>
> after:
>     public void onScannedRobot(ScannedRobotEvent e) {
>         // calculate firepower based on distance
>         double firePower = Math.min(500 / e.getDistance(), 3);
>         double bulletSpeed = 20 - firePower * 3;
>
>         double eAbsoluteBearing = getHeadingRadians() + e.
> getBearingRadians();
>         double eLateralVelocity = e.getVelocity() * Math.sin(e.
> getHeadingRadians() - eAbsoluteBearing);
>         double offset = Math.asin(eLateralVelocity/bulletSpeed);
>         setTurnGunRightRadians(Utils.normalRelativeAngle(eAbsoluteBearing 
> - getGunHeadingRadians() + offset ));
>
>         // if the gun is cool and we're pointed at the target, shoot!
>         if ( getGunHeat() == 0 && Math.abs(getGunTurnRemaining()) < 10 ) {
>             setFire(firePower);
>         }
>         execute();
>             
>         turnRadarRightRadians(Utils.normalRelativeAngle( getHeadingRadians
> () + e.getBearingRadians() - getRadarHeadingRadians() ));
>
>     }
>
>
>
> On Sunday, May 4, 2014 5:58:27 PM UTC-3, fnl wrote:
>>
>> Your code look okay to me. I have downloaded the source, compiled it, and 
>> had several games againt sample.Walls.
>> I see you are right that the bullet is always "behind" - but I can't see 
>> why.
>>
>> With my own bots I usually computes the x,y coordinates of the enemy and 
>> try to figure out what the x,y coordinate will be after my bullet has 
>> traveled the distance to the target x,y.
>>
>> I propose you have a look at the Liniar Targetting algoritms<http://robowiki.net/wiki/Linear_Targeting>available at the 
>> RoboWiki <http://robowiki.net>.
>>
>> Cheers,
>> - Flemming
>>
>> Den lørdag den 3. maj 2014 00.03.35 UTC+2 skrev Tomás Abril:
>>>
>>> Hi, I'm new to robocode and just started my first robot.
>>> I created a kind of targeting that predicts where the enemy will be if 
>>> he keeps going in the same direction and in the same speed. But it doesn't 
>>> seem to be working.
>>> My bot just shoots exactly where it scans the other robot. I am fighting 
>>> against the sample wall bot.
>>>
>>> Here is my bot:
>>> https://github.com/tomasabril/cortinabot/blob/master/Tomasbot.java
>>>
>>> Can someone help me?
>>> Thanks
>>>
>>

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