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p5.js Table get()用法及代码示例


p5.j​​s中p5.Table的get()方法用于从表的给定行和列中检索值。可以通过行ID来指定行,并且可以通过其列ID或列名来指定列。

用法:

get( row, column )

参数:此方法接受上面提到和下面描述的两个参数:

  • row:该数字表示行的行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String或Number值。

以下示例说明了p5.js中的get()方法:



范例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); 
    } 
  } 
}

输出:

范例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: 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

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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 get() 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。