p5.js red() function
Last Updated :
11 Aug, 2023
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The red() function in p5.js is used to extract the red value from a color or pixel array.
Syntax:
javascript
Output:
Example 2: This example uses red() function to extract the red value from the pixel array and used as fill color.
javascript
Output:
Reference: https://p5js.org/reference/#/p5/red
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);
}
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);
}
