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p5.js | red() function
  • Last Updated : 09 Apr, 2019

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




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