p5.js Table removeColumn()用法及代码示例

p5.js中p5.Table的removeColumn()方法用于从表中删除给定的列。可以通过使用其标题或索引值(列ID)来指定要删除的列。

用法:

removeColumn( column )

参数：该函数接受如上所述和以下描述的单个参数：

column:它是一个字符串或数字，表示要删除的列名称或列ID。

下面的示例说明了p5.js中的removeColumn()函数：

范例1：

function setup() { 
    createCanvas(500, 400); 
    textSize(16); 
  
    removeColBtn = 
        createButton("Clear Last Column"); 
  
    removeColBtn.position(30, 60); 
    removeColBtn.mouseClicked(clearLastColumn); 
  
    // Create the table 
    table = new p5.Table(); 
  
    // Add columns 
    table.addColumn("author"); 
    table.addColumn("book"); 
    table.addColumn("price"); 
    table.addColumn("rating"); 
  
    // Add 10 random rows to the table 
    for (let i = 0; i < 10; i++) { 
        let newRow = table.addRow(); 
        newRow.setString("author", 
            "Author " + floor(random(1, 100))); 
        newRow.setString("book", 
            "Book " + floor(random(1, 100))); 
        newRow.setString("price", 
            "$" + floor(random(10, 100))); 
        newRow.setString("rating", 
            random(1, 5).toFixed(2)); 
    } 
  
    // Display the rows currently present 
    getTableRows(); 
} 
  
function clearLastColumn() { 
    clear(); 
    text("Click on the button to clear "
        + "the last column in the table", 
        20, 20); 
  
    // Get the index of the last column 
    // of the table 
    let lastColumn = 
        table.getColumnCount() - 1; 
  
    // Use the removeColumn() method to 
    // clear the given column of the table 
    if (lastColumn >= 0) 
        table.removeColumn(lastColumn); 
  
    text("Last column cleared!", 20, 140); 
    getTableRows(); 
} 
  
function getTableRows() { 
    clear(); 
    text("Click on the button to clear "
        + "the last column in the table", 
        20, 20); 
  
    // Display the total columns 
    // present in the table 
    text("There are " + 
        table.getColumnCount() + 
        " columns in the table", 20, 120); 
  
    // Show the table with the columns and rows 
    for (let r = 0; r < table.getRowCount(); r++) 
        for (let c = 0; c < table.getColumnCount(); c++) 
            text(table.getString(r, c), 20  
                    + c * 100, 140 + r * 20); 
}

输出：
removeCol-last

范例2：

function setup() { 
  createCanvas(500, 400); 
  textSize(16); 
   
  columnInput = createInput(); 
  columnInput.position(30, 40); 
   
  clearColBtn = 
    createButton("Clear Given Column"); 
  clearColBtn.position(30, 70); 
  clearColBtn.mouseClicked(clearColumn); 
   
  // Create the table 
  table = new p5.Table(); 
   
  // Add columns 
  table.addColumn("author"); 
  table.addColumn("book"); 
  table.addColumn("price"); 
  table.addColumn("rating"); 
   
  // Add 10 random rows to the table 
  for (let i = 0; i < 10; i++) { 
    let newRow = table.addRow(); 
    newRow.setString("author", 
      "Author " + floor(random(1, 100))); 
    newRow.setString("book", 
      "Book " + floor(random(1, 100))); 
    newRow.setString("price", 
      "$" + floor(random(10, 100))); 
    newRow.setString("rating", 
       random(1, 5).toFixed(2)); 
  } 
   
  // Display the rows currently present 
  getTableRows(); 
} 
   
function clearColumn() { 
  clear(); 
  text("Click on the button to clear "
     + "the given column in the table", 
    20, 20); 
   
  // Get the index of the column to be removed 
  let colToClear = 
    int(columnInput.value()); 
   
  // Use the removeColumn() method to 
  // clear the given column of the table 
  if (colToClear >= 0 && 
      colToClear < table.getColumnCount()) 
    table.removeColumn(colToClear); 
   
  text("Last column cleared!", 20, 140); 
  getTableRows(); 
} 
   
function getTableRows() { 
  clear(); 
  text("Click on the button to clear "
    + "the given column in the table", 
    20, 20); 
   
  // Display the total columns  
  // present in the table 
  text("There are " +  
    table.getColumnCount() +  
    " columns in the table", 20, 120); 
   
  for (let r = 0; r < table.getRowCount(); r++) 
    for (let c = 0; c < table.getColumnCount(); c++) 
      text(table.getString(r, c), 
           20 + c * 100, 
           140 + r * 20); 
}

输出：
removeCol-specified

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/removeColumn

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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.js Table removeColumn() 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。