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