p5.js |键盘 |钥匙
p5.js 中的key变量始终包含最近按下的键的值。要获得正确的大小写,最好在keyTyped()中使用它。将 keyCode 变量用于非 ASCII 键。
句法:
key
下面的程序说明了 p5.js 中的关键变量:
示例 1:
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 Any Key to change the text within circle'
, 30, 30);
// use of keyIsPressed Variable
if (keyIsPressed) {
// draw ellipse
ellipse(mouseX, mouseY, 115, 115);
fill('red');
text("Key Is Pressed", 100, 300);
textSize(100);
text(key, mouseX, mouseY);
}
else {
rect(mouseX / 2, mouseY / 2, 300, 200);
text(key, mouseX, mouseY);
}
}
输出:
示例 2:
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(100);
text(key, height / 2, width / 2);
if (keyIsPressed) {
textSize(40);
text("is pressed", height / 7, width - 50);
}
}
输出:
参考: https://p5js.org/reference/#/p5/key