The following code plots a circle which is going to be a path for an image or a Pshape to follow. Where I’ve used a = (i * TAU) / 90 seems a bit clumsy and I’m wondering if anyone can suggest what I should have done here?

```
void setup()
{
size(400, 200);
stroke(255, 0, 0);
strokeWeight(2);
background(204);
timeEnd = millis();
}
float x = 0.0;
float y = 0.0;
float a = 0.0;
int i = 0;
int timeEnd;
void draw()
{
if (millis() > timeEnd + 100)
{
timeEnd = millis();
i += 1;
//if (i > 90)
//{
// i = 0;
//}
a = (i * TAU) / 90;
x = (sin(a) * 50) + 60;
y = (cos(a) * 50) + 60;
point(x, y);
println("x = ", x, "y = ", y);
}
}
```