📜  p5.Table setString() 方法

📅  最后修改于: 2022-05-13 01:56:47.632000             🧑  作者: Mango

p5.Table setString() 方法

p5.js 中 p5.Table 的setString() 方法用于将给定的 String 值存储到表的给定行和列中。行可以由行 ID 指定,列可以由其列 ID 或列名指定。

句法:

setString( row, column, value )

参数:此函数接受三个参数,如上所述,如下所述:

  • row:它是一个数字,表示行的行ID。
  • column:它是一个字符串或数字,表示列的名称或列的 ID。
  • value:它是一个字符串,指定必须存储的值。

以下示例说明了 p5.js 中的setString() 方法

示例 1:

function setup() {
  createCanvas(500, 300);
  textSize(18);
  
  text("Click the button to modify" +
       " the table", 20, 20);
  
  setBtn =
    createButton("Change Status");
  setBtn.position(30, 60);
  setBtn.mouseClicked(modifyTableData);
  
  // Create the table
  table = new p5.Table();
  
  // Add the columns and rows
  table.addColumn("flight");
  table.addColumn("status");
  
  let row = table.addRow();
  row.setString("flight", "American Air");
  row.setString("status", "On Time");
  
  row = table.addRow();
  row.setString("flight", "Lufthansa");
  row.setString("status", "On Time");
  
  row = table.addRow();
  row.setString("flight", "United Air");
  row.setString("status", "Delayed");
  
  showTable();
}
  
function modifyTableData() {
  
  // Loop through all the rows
  // in the table
  for (let r = 0; r < table.getRowCount(); r++) {
  
    // Change the string of the status column
    if (table.getString(r, "status") == "On Time") 
      table.setString(r, "status", "Delayed");
    else table.setString(r, "status", "On Time");
  }
  
  showTable();
}
  
function showTable() {
  clear();
  text("The value is modified using the" +
       " setString() method", 20, 20);
  
  // Show all the columns present
  for (let c = 0; c < 2; c++) {
    text(table.columns,
         20 + 160 * c, 110);
  }
  
  // Show all the rows currently
  // present in the table
  for (let r = 0; r < 3; r++) {
    for (let c = 0; c < 2; c++) {
      text(table.getString(r, c),
           20 + 160 * c,
           140 + 20 * r);
    }
  }
}

输出:
设置字符串-ex1

示例 2:

function setup() {
  createCanvas(500, 300);
  textSize(18);
  
  setBtn = createButton("Toggle Strings");
  setBtn.position(30, 40);
  setBtn.mouseClicked(modifyTableData);
  
  // Create the table
  table = new p5.Table();
  
  for (let i = 0; i < 10; i++) {
    table.addColumn();
    table.addRow();
  }
  
  createTable();
}
  
function createTable() {
  
  // Loop through all the rows and columns
  // in the table and set their initial
  // string values
  for (let r = 0; r < table.getRowCount(); r++) {
    for (let c = 0; c < table.getColumnCount(); c++) {
      if ((r + c) % 2 == 0) 
        table.setString(r, c, "X");
      else table.setString(r, c, "O");
    }
  }
  
  showTable();
}
  
function modifyTableData() {
  
  // Loop through all the rows and columns
  // in the table and change their values
  // depending on the previous string
  for (let r = 0; r < table.getRowCount(); r++) {
    for (let c = 0; c < table.getColumnCount(); c++) {
      if (table.getString(r, c) == "X") 
        table.setString(r, c, "O");
      else table.setString(r, c, "X");
    }
  }
  
  showTable();
}
  
function showTable() {
  clear();
  text("The value is modified using the" + 
       " setString() method", 20, 20);
  
  // Show all the rows currently
  // present in the table
  for (let r = 0; r < table.getRowCount(); r++) {
    for (let c = 0; c < table.getColumnCount(); c++) {
      text(table.getString(r, c), 
           20 + 40 * c, 
           80 + 20 * r);
    }
  }
}

输出:
设置字符串-ex2

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/setString