The keyIsPressed variable in p5.js is true if any key is pressed and false if no keys are pressed.
Syntax:
keyIsPressed
The below program illustrates the key is pressed variable in p5.js.
Example-1:
javascript
let valueX; let valueY; function setup() {
// Create Canvas of size 500*500
createCanvas(1000, 500);
} function draw() {
// set background color
background(200);
fill( 'green' );
// set text and text size
textSize(25);
text( 'Press Key to change the figure ' +
'from Circle To Keyboard' , 30, 30);
// use of keyIsPressed Variable
if (keyIsPressed) {
// draw ellipse
ellipse(mouseX, mouseY, 115, 115);
fill( 'red' );
text( "Key Is Pressed" , 100, 300);
} else {
rect(mouseX / 2, mouseY / 2, 300, 200);
}
}; |
Output:
Before:
After:
Example-2:
javascript
let valueX; let valueY; function setup() {
// Create Canvas of size 500*500
createCanvas(500, 500);
} function draw() {
// set background color
background(200);
fill( 'green' );
// set text and text size
textSize(25);
text( 'Click to flip the figure' , 30, 30);
// use of KeyIsPressed
if (keyIsPressed) {
fill(valueX, 255 - valueY, 255 - valueX);
// draw rectangle
rect(mouseX, mouseY, 115, 115);
fill(valueY, 255 - valueX, 255 - valueX);
rect(mouseX, mouseY + 115, 115, 115);
fill(255 - valueY, 255 - valueX, 255 - valueY);
} else {
rect(mouseX - 115, mouseY, 115, 115);
fill(255 - valueY, 255 - valueY, 255 - valueY);
rect(mouseX - 115, mouseY + 115, 115, 115);
}
}; |
Output: Before:
After:
Reference: https://p5js.org/reference/#/p5/keyIsPressed