p5.js NumberDict add() 方法
p5.js 中 p5.NumberDict 的add() 方法将给定值添加到给定键处的值,并将更新后的值存储在同一键处。键值对是一组相互映射的两个值。可以通过使用该对的键部分查询此字典来访问这些值。数字字典可以存储多个键值对,这些键值对可以使用字典的方法进行访问。
句法:
add( Key, Number )
参数:这个函数有两个参数,如上所示,下面讨论:
- 键:这是一个数字,表示将添加值的键。
- 数字:这是一个数字,表示要添加的值。
下面的示例说明了 p5.js 中的add() 方法:
例子:
Javascript
let y = 0;
function setup() {
createCanvas(550, 500);
textSize(16);
text("Click on the button to create a new " +
"dictionary and add the given value",
20, 20);
text("Key:", 20, 260);
text("Value:", 160, 260);
key_input = createInput();
key_input.position(70, 250);
key_input.size(40);
val_input = createInput();
val_input.position(220, 250);
val_input.size(40);
setBtn =
createButton("Create random dictionary");
setBtn.position(30, 40);
setBtn.mouseClicked(createNewDict);
addBtn =
createButton("Add given value to key");
addBtn.position(30, 300);
addBtn.mouseClicked(addVal);
}
function createNewDict() {
clear();
// Create an object with random values
let obj = {};
for (let i = 0; i < 6; i++) {
let rk = ceil(Math.random() * 100);
let rn = floor(Math.random() * 100);
obj[rk] = rn;
text("Key: " + rk + " : Value: " +
rn, 40, 120 + 20 * i);
}
// Create a number dict using the above values
numDict = createNumberDict(obj);
text("New Dictionary created with values",
20, 80);
text("Click on the button to create a new " +
"dictionary and add the given value",
20, 20);
text("Key:", 20, 260);
text("Value:", 160, 260);
}
function addVal() {
// Get the key and value to be updated
let keyToChange = int(key_input.value());
let valToAdd = int(val_input.value());
// Get the previous value in the dictionary
let prevVal = numDict.get(keyToChange);
// If the key exists in the dictionary
if (prevVal) {
numDict.add(keyToChange, valToAdd);
// Get the updated value
let updatedVal = numDict.get(keyToChange);
text("The value at key: " + keyToChange +
" was: " + prevVal, 20, 360 + y * 40);
text("The updated value at key: " +
keyToChange + " is: " + updatedVal,
20, 380 + y * 40);
}
else {
text("Please enter a proper key",
20, 380 + y * 40);
}
y = y + 1;
text("Click on the button to create a new " +
"dictionary and add the given value",
20, 20);
}
输出:
在线编辑器: https://editor.p5js.org/
环境设置: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
参考: https://p5js.org/reference/#/p5.NumberDict/add