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p5.js Table getObject()用法及代码示例


p5.j​​s中p5.Table的getObject()方法用于检索表中的所有数据作为对象。可以指定一个可选的列名来存储表的所有行,并将该列名作为属性。

用法:

getObject( [headerColumn] )

参数:此方法接受如上所述和以下描述的单个参数:

  • headerColumn:它是一个String,表示应该用作每个行对象标题的列的名称。

返回值:此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:



范例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); 
  } 
}

输出:

范例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: 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

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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.Table getObject() 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。