p5.TableRow get() 方法

p5.js 中 p5.TableRow 的get() 方法用于从表行的给定列中检索值。列可以由其列 ID 或列名指定。

句法：

get( column )

参数：此方法接受如上所述和如下所述的单个参数：

• column：它是一个字符串或数字，表示列的名称或列的 ID。

返回值：此方法返回从表的给定列检索的字符串或数字值。

以下示例说明了 p5.js 中的get() 方法：

示例 1：

Javascript

function setup() {
  createCanvas(500, 300);
  textSize(16);
  
  text("Click on the button to get " + 
       "all the values of the table",
       20, 20);
  
  setBtn =
    createButton("Get all table values");
  setBtn.position(30, 40);
  setBtn.mouseClicked(showTable);
  
  // Create the table
  table = new p5.Table();
  
  // Add two columns
  table.addColumn("name");
  table.addColumn("id");
  
  // Add some rows to the table
  let newRow = table.addRow();
  newRow.setString("name", "Suresh");
  newRow.setString("id", 1);
  
  newRow = table.addRow();
  newRow.setString("name", "Ishaan");
  newRow.setString("id", 22);
  
  newRow = table.addRow();
  newRow.setString("name", "Kumar");
  newRow.setString("id", 32);
  
  newRow = table.addRow();
  newRow.setString("name", "Ram");
  newRow.setString("id", 332);
  
  newRow = table.addRow();
  newRow.setString("name", "Shreya");
  newRow.setString("id", 19);
}
  
function showTable() {
  clear();
  text("The values of a tableRow " +
       "are retrieved using the get() method",
       20, 20);
  
  // Show all the columns present
  for (let c = 0; c < 2; c++) {
    text(table.columns,
         20 + 100 * c, 80);
  }
  
  // Show all the rows currently
  // present in the table
  for (let r = 0; r < 5; r++) {
      
    // Using the name column
    text(table.rows[r].get("name"),
         20, 120 + 20 * r);
  
    // Using the id column
    text(table.rows[r].get("id"),
         120, 120 + 20 * r);
  }
}

输出：

示例 2：

Javascript

function setup() {
  createCanvas(500, 300);
  textSize(18);
  
  text("Click on the button to get " +
       "that value in the table",
       20, 20);
    
  text("Enter the row needed:", 20, 60);
  
  rowInp = createInput();
  rowInp.position(30, 80);
  rowInp.size(30, 20);
  
  text("Enter the column needed:", 20, 120);
  
  colInp = createInput();
  colInp.position(30, 140);
  colInp.size(30, 20);
  
  setBtn =
    createButton("Get value at row and column");
  setBtn.position(30, 180);
  setBtn.mouseClicked(getValueAt);
  
  // Create the table
  table = new p5.Table();
  
  setTableData();
}
  
function setTableData() {
  
  // Add 5 columns and rows to the table
  for (let i = 0; i < 5; i++) {
    table.addColumn("Column " + i);
    table.addRow();
  }
  
  for (let r = 0; r < 5; r++) {
    for (let c = 0; c < 5; c++) {
  
      // Set the value at the given
      // column and row of the table
      table.set(r, c, r + "::" + c);
    }
  }
}
  
function getValueAt() {
  clear();
  let rowToGet = int(rowInp.value());
  let colToGet = int(colInp.value());
  
  if (rowToGet < table.getRowCount() &&
      colToGet < table.getColumnCount()) {
    text("The value at row " + rowToGet +
         " and column " + colToGet +
         " is:", 20, 240);
  
    // Get the row of the table
    let tableRow = table.rows[rowToGet];
  
    // Get the value of the given column
    // from the row using the get() method
    text(tableRow.get(colToGet), 30, 260);
  }
  else
    text("Please enter correct row " + 
         "and column values", 20, 240);
  
  text("Click on the button to get " + 
       "that value in the table", 20, 20);
  text("Enter the row needed:", 20, 60);
  text("Enter the column needed:", 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.TableRow/get