The mouseDragged() function in p5.js is used to check the mouse drags (mouse moves and mouse button pressed). It is invoked each time when the mouse drags. If mouseDragged() function is not defined, then touchMoved() function will be used instead of mouseDragged() function.
Syntax:
mouseDragged(Event)
Below programs illustrate the mouseDragged() function in p5.js:
Example 1: This example uses mouseDragged() function to change the background color.
function setup() { // Create Canvas createCanvas(500, 500); } let value = 0; function draw() { // Set background color background(200); // Set filled color fill(value); // Create rectangle rect(25, 25, 460, 440); // Set text color fill('lightgreen'); // Set font size textSize(15); // Display result text('Drag Mouse Across the page to change its value.', windowHeight/6, windowWidth/4); } function mouseDragged() { value = value + 5; if (value > 255) { value = 0; } } |
Output:
Example 2: This example uses mouseDragged() function to change the mouse cursor circle color.
let value; function setup() { // Create Canvas createCanvas(500, 500); } function draw() { // Set background color background(200); // Set filled color fill('green'); // Set text and text size textSize(25); text('Drag mouse to change color', 30, 30); // Fill color according to // mouseMoved() function fill(value, 255-value, 255-value); // Draw ellipse ellipse(mouseX, mouseY, 115, 115); } function mouseDragged() { value = mouseX%255; } |
Output:
Reference: https://p5js.org/reference/#/p5/mouseDragged
