I'm trying to create an interface similar to how polar clock works
I'm just starting out with trying to get the seconds bit working correctly..

My code so far is:
Code:

float radius = 75;
float clockDiameter = radius * 2;
float cx, cy;

void setup() {
  size(200, 200);
  background(127);
  cx = 100;
  cy = 100;
}

void draw() {
  //ellipse(cx, cy, clockDiameter, clockDiameter);
  float s = map(second(), 0, 60, 0, TWO_PI) - HALF_PI;
  stroke(255);
  strokeWeight(1);
  float theta = radians(s);
  //arc(cx, cy, clockDiameter, clockDiameter, PI, radians(250));
  //line(cx, cy, cx + cos(s) * radius, cy + sin(s) * radius);
  //arc(50, 55, 80, 80, TWO_PI-PI/2, TWO_PI);
  arc(cx, cy, clockDiameter, clockDiameter, TWO_PI-PI/2, theta);
}
 

I'm having trouble with the PI bit in the arc call I think.. I'm close I think.. Can someone shed some light? I'm trying to do it so the arc always starts at the top like on a analog clock and depending on how many seconds there are define an angle for the end position..

Thanks

Dan

Not sure what you want to see.  If you want to shift from the 3:00 position to the 12:00 position, though, that's a shift of -PI/2...so:

float theta = radians(s) * 6;

could become

float theta = radians(s) * 6 - PI/2;