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.

 `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);  ` `} `

Output:

Example 2: This example uses quad() function to create polygon with z-coordinate.

 `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);  ` `} `

Output:

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