📜  p5.Table get() 方法

📅  最后修改于: 2022-05-13 01:56:41.046000             🧑  作者: Mango

p5.Table get() 方法

p5.js 中 p5.Table 的get() 方法用于从表的给定行和列中检索值。行可以由行 ID 指定,列可以由其列 ID 或列名指定。

句法:

get( row, column )

参数:此方法接受上面提到的两个参数,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。

返回值:此方法返回从表的给定行和列中检索到的字符串或数字值。

以下示例说明了 p5.js 中的get() 方法

示例 1:

Javascript
function setup() {
  createCanvas(500, 300);
  textSize(18);
  
  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();
  
  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 showTable() {
  clear();
  text("The values of the table are retrieved " +
       "using the get() method", 20, 20);
  
  // Show all the columns present
  for (let c = 0; c < 5; c++) {
    text(table.columns, 20 + 100 * c, 80);
  }
  
  // Show all the rows currently
  // present in the table
  for (let r = 0; r < 5; r++) {
    for (let c = 0; c < 5; c++) {
  
      // Get the value at the given row
      // and column
      text(table.get(r, c),
          20 + 100 * c,
          100 + 20 * r);
    }
  }
}


Javascript
function setup() {
  createCanvas(500, 300);
  textSize(18);
  
  text("Click on the button to get " + 
       "that value in the table", 20, 20);
    
  text("Enter row and column", 20, 60);
  
  rowInp = createInput();
  rowInp.position(30, 80);
  rowInp.size(30, 20);
  
  colInp = createInput();
  colInp.position(70, 80);
  colInp.size(30, 20);
  
  setBtn =
    createButton("Get value at row and column");
  setBtn.position(30, 110);
  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, 160);
  
    // Get the value at the given row
    // and column
    text(table.get(rowToGet, colToGet), 20, 180);
  }
  else
    text("Please enter correct row and " +
    "column values", 20, 160);
  
  text("Click on the button to get that value " + 
       "in the table", 20, 20);
  text("Enter row and column", 20, 60);
}


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 row and column", 20, 60);
  
  rowInp = createInput();
  rowInp.position(30, 80);
  rowInp.size(30, 20);
  
  colInp = createInput();
  colInp.position(70, 80);
  colInp.size(30, 20);
  
  setBtn =
    createButton("Get value at row and column");
  setBtn.position(30, 110);
  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, 160);
  
    // Get the value at the given row
    // and column
    text(table.get(rowToGet, colToGet), 20, 180);
  }
  else
    text("Please enter correct row and " +
    "column values", 20, 160);
  
  text("Click on the button to get that value " + 
       "in the table", 20, 20);
  text("Enter row and column", 20, 60);
}

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/get