The
quad() function is an inbuilt function in p5.js which is used to draw a quadrilateral. A quadrilateral is a four-sided polygon. It function creates a shape similar to rectangle, but the angles between two edges are not constrained to 90 degrees.
Syntax: quad(x1, y1, x2, y2, x3, y3, x4, y4)
or
quad(x1, y1, z1, x2, y2, z2, x3, y3, z3, x4, y4, z4)
Parameters: This function accepts twelve parameters as mentioned above and described below:
- x1: This parameter takes the x-coordinate of the first point.
- y1: This parameter takes the y-coordinate of the first point.
- z1: This parameter takes the z-coordinate of the first point.
- x2: This parameter takes the x-coordinate of the second point.
- y2: This parameter takes the y-coordinate of the second point.
- z2: This parameter takes the z-coordinate of the second point.
- x3: This parameter takes the x-coordinate of the third point.
- y3: This parameter takes the y-coordinate of the third point.
- z3: This parameter takes the z-coordinate of the third point.
- x4: This parameter takes the z-coordinate of the fourth point.
- y4: This parameter takes the z-coordinate of the fourth point.
- z4: This parameter takes the z-coordinate of the fourth point.
Below programs illustrates the quad() function in P5.js:
Example 1: This example uses quad() function to create a polygon without using z-coordinate.
JavaScript function setup() { // Create canvas of given size createCanvas(400, 400); } function draw() { // Set the background color background(220); noStroke(); // Set the fill color fill('green'); // x1, y1 = 38, 31; x2, y2 = 300, 20; // x3, y3 = 100, 63; x4, y4 = 130, 250 quad(38, 31, 300, 20, 100, 63, 130, 250); } 
Example 2: This example uses quad() function to create polygon with z-coordinate.
JavaScript function setup() { // Create canvas of given size createCanvas(400, 400); } function draw() { // Set the background color background(99); noStroke(); // Set the filled color fill('pink'); // x1, y1, z1 = 38, 131, 100; // x2, y2, z2 = 320, 100, 63; // x3, y3, z3 = 130, 150, 134; // x4, y4, z4 = 155, 66, 88; quad(38, 131, 100, 320, 100, 63, 130, 150, 134, 155, 66, 88); } 
Reference: https://p5js.org/reference/#/p5/quad