p5.js | stroke() Function

The stroke() function is used to draw the lines and border around the text and shapes. The color object can be set in terms of RGB or HSB depending on the color mode. The color object can also be set as string in terms of RGB, RGBA, Hex CSS color or named color string. Syntax:

stroke( v1, v2, v3, alpha )

or

stroke( value )

or

stroke( gray, alpha )

or

stroke( values )

or

stroke( color )

Parameters:

• v1: It is used to set the red or hue value relative to current color range.
• v2: It is used to set the green or saturation value relative to current color range.
• v3: It is used to set the blue or brightness value relative to current color range.
• alpha: It is used to set the transparency of the drawing.
• value: It is used to set the value of color string.
• gray: It is used to set the gray value.
• values: It is an array containing the red, green, blue and alpha value.
• color: It is used to set the stroke color.

Below examples illustrate the stroke() function in p5.js: Example 1:

javascript

function setup() {

    // Create Canvas of given size
    createCanvas(400, 200);
}

function draw() {

    // Set the background color
    background(220);

    // Set the stroke width
    strokeWeight(10);

    // Set the stroke
    stroke('green');

    // Set the filled color
    fill('white');

    // Draw the circle
    circle(90, 90, 34);

    // Set the text size
    textSize(20);

    // Set the text to print
    text("GeeksForGeeks", 140, 100);
}

Output: Example 2:

javascript

function setup() {

    // Create Canvas of given size
    createCanvas(400, 200);
}

function draw() {

    // Set the background color
    background(220);

    // Set the stroke color
    stroke('orange');

    // Set the stroke width to 10
    strokeWeight(30); // Orange

    // Draw a line
    line(100, 50, 300, 50);

    // Set the stroke color
    stroke('white');

    // Set the stroke width to 8
    strokeWeight(30); // White

    // Draw a line
    line(100, 100, 300, 100);

    // Set stroke color
    stroke('green');

    // Set the stroke width to 6
    strokeWeight(30); // Green

    // Draw a line
    line(100, 150, 300, 150);
}

Output: Reference: https://p5js.org/reference/#/p5/stroke