The red() function in p5.js is used to extract the red value from a color or pixel array.
Syntax:
red(c)
Parameters: This function accepts single parameter c which stores the p5.Color object, color components, or CSS color.
Below programs illustrates the red() function in p5.js:
Example 1: This example uses red() function to extract the red value from the pixel array.
function setup() {
// Create Canvas of size 300*80
createCanvas(300, 80);
} function draw() {
// Set background color
background(220);
// Initialize the parameter
let c = color(67, 126, 255, 102);
// Extract the red value
let y = red(c);
// Set the font size
textSize(16);
// Set the font color
fill(color( 'red' ));
// Display result
text( "Red Value is : " + y, 50, 30);
} |
Output:
Example 2: This example uses red() function to extract the red value from the pixel array and used as fill color.
function setup() {
// Create Canvas of size 300*180
createCanvas(160, 180);
} function draw() {
// Set background color
background(220);
// Initialize the parameter
let c = color(80, 126, 100, 34);
// Sets 'value' to 80
let value = red(c);
// Fill the color
fill(value, 0, 0);
// Create rectangle
rect(50, 15, 35, 70);
// Display result
text( "Value of red is : " + value, 22, 110);
} |
Output:
Reference: https://p5js.org/reference/#/p5/red