Programming a robot for a contest

[eax]

I am programming a robots movements(virtual robot not a physical, like a game) its a contest, I asked last year students that did this contest and there robot got to 4th place by a fluke, their robot did random stuff . I'm in high school grade 11. University students are also partisipating in this event, last year their robot shot ahead of other robots. Thats what I want to do.

I know the obsolute position of my own robot(lets call my robot R for Robo) and its rotation, also its rotation of stuff like gun, and radar for detecting other robots. If the R detects another robot, R only knows the distance between R and the robot, and the degrees it would have to turn to face the robot. So I need to convert this to obsolute coordinates so when R moves around it can look where it last scene the robot.

If I can get the obsolute coordinates of the enemy robot, its all I need for my plan to shoot ahead of its path. I already tested this plan out and it works good if R is just standing still and not moving. How may I get obsolute coordinates of the enemy robot?

I tryed doing this my self but R is rotated so I can't just add obsolute coordinates of R to enemy robots. I'm lost I don't know how to do this.

Thanks in advance!

 

[OlderDan]

R's position is (x,y) (known) and he is facing in direction A (known) relative to the reference, which I will assume is the +x axis. The second robot R2 is a distance D2 (R2D2; cute heh ) from R in a direction B from the direction R is facing.

Let R turn B to face R2. R will know the direction (A+B) he is facing relative to the +x axis after this turn. The position of R2 is then (x+D2cos(A+B), y+D2sin(A+B))

 

[eax]

Thanks!

I have one problem, I tryed my self using sign, I even made if statements for different quadrants on the plane for this.

I have after movement converted R2 to be relative to R now I need to get the angle to move the gun on it. 0 degrees is up, I can't seem to get it to aim properly. I have worked with something similar before but 0 degrees was right.

Knowing 0 degrees is up, let's say after converting R2 relative to R the R2(x,y) lay in the bottom left quadrant where x & y are negative. How may I calculate the angle there,

Iam doing this
angle = acos(-R2(x)/R2(distance from R))
since R2(x) is negative I make the whole thing be positive.
angle = angle + 90
I added by 90 for bottom quadrant
angle = angle * -1
I inverse it for other quadrant

It doesn't work properly. Whats wrong?

Thanks in advance!