TWO_PI

A number constant that's approximately 6.2832.

TWO_PI is the mathematical constant 2*π. It's useful for many tasks that involve rotation and oscillation. For example, calling rotate(TWO_PI) rotates the coordinate system TWO_PI radians, which is a complete turn (360 degrees).

Note: TWO_PI radians equals 360 degrees, PI radians equals 180 degrees, HALF_PI radians equals 90 degrees, QUARTER_PI radians equals 45 degrees.

Examples

TWO_PI example 1

function setup()
  size(100, 100)

  background(200)

  -- Draw an arc from 0 to TWO_PI.
  arc(50, 50, 80, 80, 0, TWO_PI)

  describe('A white circle drawn on a gray background.')
end

TWO_PI example 2

function setup()
  size(100, 100)

  background(200)

  -- Translate the origin to the center.
  translate(50, 50)

  -- Draw a line.
  line(0, 0, 40, 0)

  -- Rotate a full turn.
  rotate(TWO_PI)

  -- Style the second line.
  strokeWeight(5)

  -- Draw the same line, shorter and rotated.
  line(0, 0, 20, 0)

  describe(
    'Two horizontal black lines on a gray background. A thick line extends from the center toward the right. A thin line extends from the end of the thick line.'
  )
end

TWO_PI example 3

function setup()
  size(100, 100)

  describe(
    'A red circle with a blue center oscillates from left to right on a gray background.'
  )
end

function draw()
  background(200)

  -- Translate the origin to the center.
  translate(50, 50)

  -- Calculate the x-coordinates.
  local x1 = 40 * sin(frameCount * 0.05)
  local x2 = 40 * sin(frameCount * 0.05 + TWO_PI)

  -- Style the oscillators.
  noStroke()

  -- Draw the red oscillator.
  fill(255, 0, 0)
  circle(x1, 0, 20)

  -- Draw the blue oscillator, smaller.
  fill(0, 0, 255)
  circle(x2, 0, 10)
end

This reference page contains content adapted from p5.js and Processing by p5.js Contributors and Processing Foundation, licensed under CC BY-NC-SA 4.0.

TWO_PI

Examples

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