p5.js | p5.Table addColumn() 方法
p5.js 中 p5.Table 的addColumn() 方法用于向表对象添加新列。该方法接受一个参数,该参数用于指定列的标题,以便以后可以轻松引用它。它是一个可选值,不指定标题会使新列的标题为空。
句法:
addColumn( [title] )
参数:此函数接受如上所述和如下所述的单个参数:
- title:它是一个字符串,表示新列的标题。它是一个可选参数。
以下示例说明了 p5.js 中的addColumn()函数:
示例 1:
javascript
function setup() {
createCanvas(500, 300);
textSize(16);
saveTableBtn = createButton("Save Table");
saveTableBtn.position(30, 50);
saveTableBtn.mouseClicked(saveToFile);
text("Click on the button to save table to csv", 20, 20);
// Create the table
table = new p5.Table();
// Add two columns
// using addColumn()
table.addColumn("author");
table.addColumn("language");
// Add two rows
let newRow = table.addRow();
newRow.setString("author", "Dennis Ritchie");
newRow.setString("language", "C");
newRow = table.addRow();
newRow.setString("author", "Bjarne Stroustrup");
newRow.setString("language", "C++");
text("The table has " + table.getColumnCount() +
" columns", 20, 100);
}
function saveToFile() {
saveTable(table, "saved_table.csv");
}
javascript
function setup() {
createCanvas(600, 300);
textSize(16);
addColBnt = createButton("Add Column");
addColBnt.position(30, 20);
addColBnt.mouseClicked(addNewCol);
// Create the table
table = new p5.Table();
}
function addNewCol() {
let colName = "Random Column " + floor(random(1, 100));
// Add the given column to table
table.addColumn(colName);
}
function draw() {
clear();
// Show the total number of columns
// and current column names
text("The table has " + table.getColumnCount() +
" columns", 20, 60);
text("The columns are", 20, 80);
for (let i = 0; i < table.columns.length; i++) {
text(table.columns[i], 20, 100 + i * 20);
}
}
输出:
示例 2:
javascript
function setup() {
createCanvas(600, 300);
textSize(16);
addColBnt = createButton("Add Column");
addColBnt.position(30, 20);
addColBnt.mouseClicked(addNewCol);
// Create the table
table = new p5.Table();
}
function addNewCol() {
let colName = "Random Column " + floor(random(1, 100));
// Add the given column to table
table.addColumn(colName);
}
function draw() {
clear();
// Show the total number of columns
// and current column names
text("The table has " + table.getColumnCount() +
" columns", 20, 60);
text("The columns are", 20, 80);
for (let i = 0; i < table.columns.length; i++) {
text(table.columns[i], 20, 100 + i * 20);
}
}
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/addColumn