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p5.js | Constants | HALF_PI
  • Last Updated : 12 Apr, 2019

The HALF_PI is a mathematical constant and its value is 1.57079632679489661923. The HALF_PI is the half ratio of the circumference of a circle to its diameter.

Syntax:

HALF_PI

Below program illustrates the usage of HALF_PI in p5.js:

Example:

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function setup() {
  
    // Create Canvas of size 300*200
    createCanvas(300, 200);
}
  
function draw() {
      
    // Set the background Color
    background(220);
      
    // Set the stroke color
    stroke(255, 204, 0);
      
    // Set the stroke weight
    strokeWeight(4);
      
    // Use of constant HALF_PI
    arc(50, 50, 280, 280, 0, HALF_PI/2); 
      
    noStroke();
      
    // Set the font size
    textSize(20);
      
    // Display result
    text("Value of HALF_PI is "
            + HALF_PI, 30, 180);
}

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Output:

Reference: https://p5js.org/reference/#/p5/HALF_PI

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