How to go about making tankDrive and ArcadeDrive methods

[mwtidd]

Originally Posted by kinganu123

That doesnt work for moving the joystick to the corners or towards them. thats the hardest part of arcade and ive been trying a bunch of algorithims but none of them can be used for more than one specific coordinate

well you could do an if > 1 output 1
or a divide by 2
those should work somewhat.

the best case would be to use trig even for an arcade drive to ensure max values

[Ether]

Originally Posted by kinganu123

That doesnt work for moving the joystick to the corners or towards them. thats the hardest part of arcade and ive been trying a bunch of algorithims but none of them can be used for more than one specific coordinate

Look at this diagram, and see if you can figure out what the left and right motor speeds should be for the red, green, and blue dots. If you can do that, you should be able to design an algorithm to compute the wheel speeds for any joystick position.

Some drivers find this behavior more intuitive.

[Ether]

Originally Posted by kinganu123

That doesnt work for moving the joystick to the corners or towards them. thats the hardest part of arcade and ive been trying a bunch of algorithims but none of them can be used for more than one specific coordinate

What do you mean by "doesn't work" and "one specific coordinate" ? Please post a couple of example calculations to illustrate the problem you are encountering.

[Ether]

Originally Posted by lineskier

programming a mec via trig is a lot easier than doing it without it,

FR = -Y - X -Z

FL = -Y +X +Z

RR = -Y +X -Z

RL = -Y -X +Z

How does trig make the above any easier ?

for scaling reasons i'd leave out rotation at first.

Scaling is straightforward. Find the max absolute value of the 4 wheel speed commands above. If that max value exceeds the max command you want to send, then divide all 4 wheelspeeds by it.