Calculate difference between angle with an array

Programming Questions

daseck

Calculate difference between angle with an array

in Programming Questions • 7 months ago

Hi all,

I am totally new at processing and programming in java, so the question is maybe stupid, but I can't solve it right now.

I have a variable, which represents an angle. With a slider I am able to control the angle, so everytime I use the slider the variable gets a new value. And I want to calculate the difference between the actual angle and the angle before.
So I tried to work with an array, but the second array-value is always "0".

float[] angle2 = new float[2];
int n,i;
void uebergabe()
{

      angle2[n] = 180-degrees(arm2_angle);

      if (angle2[0] > angle2[1]) {
      arm2_angle_diff = angle2[0]-angle2[1];

       }
      else if (angle2[0] < angle2[1]) {

arm2_angle_diff = angle2[1]-angle2[0];

}
}

Hope you guys can help me, I should be simple I think :)

Thank you.

Replies(3)

quarks

Re: Calculate difference between angle with an array

7 months ago

Not sure why you need an array, a couple of variables would have worked just as well.

float[] angle2 = new float[2];
int n,i;
void uebergabe(){
// Get current angle
angle2[1] = 180-degrees(arm2_angle);
// Get the positive (absoloute) difference between this and the last one
arm2_angle_diff = abs(angle2[0]-angle2[1]);
// Now we have the difference remember the current angle
angle2[0] = angle2[1]);
}

daseck

Re: Calculate difference between angle with an array

7 months ago

I thought I need an array, it not have to be!

If I try your solution my "arm2_angle_diff" is always "0.0" :(

quarks

Re: Calculate difference between angle with an array

7 months ago

arm2_angle_diff will ONLY be zero if arm2_angle does not change between calls to this method.