p5.js | bezier() function

The bezier() function in p5.js is used to draw cubic Bezier curve on the screen. These curves are defined by a series of anchor and control points.

Syntax:

bezier( x1, y1, x2, y2, x3, y3, x4, y4 )
or
bezier( x1, y1, z1, x2, y2, z2, x3, y3, z3, x4, y4, z4 )

Parameters: The function accepts twelve parameters as mentioned above and described below:

x1 This parameter stores the x-coordinate for the first anchor point

y1 This parameter stores the y-coordinate for the first anchor point

x2 This parameter stores x-coordinate for the first control point

y2 This parameter stores y-coordinate for the first control point

x3 This parameter stores x-coordinate for the second control point

y3 This parameter stores y-coordinate for the second control point

x4 This parameter stores x-coordinate for the second anchor point

y4 This parameter stores y-coordinate for the second anchor point

z1 This parameter stores z-coordinate for the first anchor point

z2 This parameter stores z-coordinate for the first control point

z3 This parameter stores z-coordinate for the second control point

z4 This parameter stores z-coordinate for the second anchor point

Below programs illustrate the bezier() function in p5.js:

Example 1: This example uses bezier() function to draw a bezier() curve.

function setup() {

    // Create canvas size
    createCanvas(150, 110);
}

function draw() {

    // Set the background color
    background(220);

    noFill();

    // Set the stroke color
    stroke(0, 0, 0);

    // Bezier function 8 parameters
    // except z-coordinate
    bezier(85, 20, 10, 10, 160, 90, 50, 80);
}

Example 2: This example uses bezier() function with all parameters to draw a bezier() curve.

function setup() {

    // Create canvas size
    createCanvas(150, 150);
}

function draw() {

    // Set the background color
    background(0, 0, 0);

    noFill();

    // Set the stroke color
    stroke(255);

    // Bezier function with all 12 parameters
    bezier(150, 150, 0, 100, 100, 0, 100, 0, 0, 0, 100, 0);
}

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