p5.js中p5.NumberDict的mult()方法将给定值乘以给定键处的值,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关键字部分查询此字典来访问这些值。数字字典可以存储可以使用字典方法访问的多个键-值对。
用法:
mult( Key, Amount )
参数:该函数有两个参数,如上所示和以下讨论:
- Key:这是一个数字,表示要从中乘以该值的键。
- Amount:这表示将数值乘以的数字。
以下示例说明了p5.js中的mult()方法:
例:
Javascript
let y = 0;
function setup() {
createCanvas(550, 500);
textSize(16);
text("Click on the button to create a new " +
"dictionary and multiply 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);
multBtn =
createButton("Multiply given value to key");
multBtn.position(30, 300);
multBtn.mouseClicked(mulVal);
}
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 multiply the given value",
20, 20);
text("Key:", 20, 260);
text("Value:", 160, 260);
}
function mulVal() {
// Get the key and value to be updated
let keyToChange = int(key_input.value());
let valToMul = 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.mult(keyToChange, valToMul);
// 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 multiply the given value",
20, 20);
}
输出:
在线编辑: 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/mult
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注:本文由纯净天空筛选整理自sayantanm19大神的英文原创作品 p5.js NumberDict mult() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。