p5.Table getObject() 方法
p5.js 中 p5.Table 的getObject() 方法用于将表中的所有数据作为对象检索。可以指定一个可选的列名来存储具有该列名作为属性的表的所有行。
句法:
getObject( [headerColumn] )
参数:此方法接受如上所述和如下所述的单个参数:
- headerColumn:它是一个字符串,表示应该用作每个行对象的标题的列的名称。
返回值:该方法返回一个包含表中所有数据的对象。
以下示例说明了 p5.js 中的getObject() 方法:
示例 1:
Javascript
function setup() {
createCanvas(600, 300);
textSize(18);
text("Click on the button to get " +
"the values of the table as an object",
20, 20);
setBtn =
createButton("Get all table values");
setBtn.position(30, 40);
setBtn.mouseClicked(showTable);
// Create the table
table = new p5.Table();
setTableData();
}
function setTableData() {
table.addColumn('Invention');
table.addColumn('Inventors');
let tableRow = table.addRow();
tableRow.setString('Invention', 'Telescope');
tableRow.setString('Inventors', 'Galileo');
tableRow = table.addRow();
tableRow.setString('Invention', 'Steam Engine');
tableRow.setString('Inventors', 'James Watt');
tableRow = table.addRow();
tableRow.setString('Invention', 'Radio');
tableRow.setString('Inventors', 'Guglielmo Marconi');
}
function showTable() {
clear();
text("All values retrieved using the " +
"getObject() method", 20, 20);
// Get all the values in the table as an array
let tableObject = table.getObject();
console.log(tableObject);
// Get every row in the table using the length
// of their keys
for (let r = 0; r < Object.keys(tableObject).length; r++) {
// Display the row using the JSON format
text(JSON.stringify(tableObject[r]), 20, 100 + 30 * r);
}
}
Javascript
function setup() {
createCanvas(600, 400);
textSize(18);
text("Click on the button to get the " +
"values of the table as an object",
20, 20);
setBtn =
createButton("Get all table values");
setBtn.position(30, 40);
setBtn.mouseClicked(showTable);
// Create the table
table = new p5.Table();
setTableData();
}
function setTableData() {
table.addColumn('Invention');
table.addColumn('Inventors');
let tableRow = table.addRow();
tableRow.setString('Invention', 'Telescope');
tableRow.setString('Inventors', 'Galileo');
tableRow = table.addRow();
tableRow.setString('Invention', 'Steam Engine');
tableRow.setString('Inventors', 'James Watt');
tableRow = table.addRow();
tableRow.setString('Invention', 'Radio');
tableRow.setString('Inventors', 'Guglielmo Marconi');
}
function showTable() {
clear();
text("All the values are retrieved " +
"using the getObject() method", 20, 20);
text("Below is the object representation " +
"of the whole table", 20, 80);
// Get all the values in the table as an object
// with the header column as "Invention"
let tableObject = table.getObject("Invention");
console.log(tableObject);
// Display the object using the JSON format
text(JSON.stringify(tableObject, null, '\t'), 20, 120);
}
输出:
示例 2:
Javascript
function setup() {
createCanvas(600, 400);
textSize(18);
text("Click on the button to get the " +
"values of the table as an object",
20, 20);
setBtn =
createButton("Get all table values");
setBtn.position(30, 40);
setBtn.mouseClicked(showTable);
// Create the table
table = new p5.Table();
setTableData();
}
function setTableData() {
table.addColumn('Invention');
table.addColumn('Inventors');
let tableRow = table.addRow();
tableRow.setString('Invention', 'Telescope');
tableRow.setString('Inventors', 'Galileo');
tableRow = table.addRow();
tableRow.setString('Invention', 'Steam Engine');
tableRow.setString('Inventors', 'James Watt');
tableRow = table.addRow();
tableRow.setString('Invention', 'Radio');
tableRow.setString('Inventors', 'Guglielmo Marconi');
}
function showTable() {
clear();
text("All the values are retrieved " +
"using the getObject() method", 20, 20);
text("Below is the object representation " +
"of the whole table", 20, 80);
// Get all the values in the table as an object
// with the header column as "Invention"
let tableObject = table.getObject("Invention");
console.log(tableObject);
// Display the object using the JSON format
text(JSON.stringify(tableObject, null, '\t'), 20, 120);
}
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.Table/getObject