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:
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:
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