The textAscent() function in p5.js is used to find out the ascent of the current font at its current size. The ascent can be defined as the distance of the tallest descender character above the baseline, in pixels.
Syntax:
textAscent()
Parameters: This function has no parameters.
Return Value: It returns a number that denotes the ascent in pixels.
The example below illustrates the textAscent() function in p5.js:
Example 1: This example shows the text ascent using the default font.
let inputElem; let currfontSize = 24; let fontBaseline = 150;   function setup() {   createCanvas(600, 300);     // Create button to increase font size   let fontBtn = createButton("Increase Font Size");   fontBtn.mouseClicked(() => {     currfontSize += 1;   });   fontBtn.position(20, 70);     // Create input box   inputElem = createInput("");   inputElem.position(20, 40); }   function draw() {   clear();   textSize(18);   text("Write in input to change the text and observe text ascent", 10, 20);   textSize(currfontSize);     // This value depends on the font used   let fontScalar = 0.8;     // Display text and line if input not empty   let enteredText = inputElem.value();   if (enteredText != "") {     text(enteredText, 20, fontBaseline);       // Draw the Base line     stroke("black");     line(0, fontBaseline, width, fontBaseline);       // Draw the Ascent Line     stroke("green");     ascVal = textAscent() * fontScalar;     line(0, fontBaseline - ascVal, width, fontBaseline - ascVal);     noStroke();       textSize(18);     text("Text Ascent Value: " + ascVal, 20, 275);   } } |
Output:
Example 2: This example shows the text ascent using a custom font.
let inputElem; let currfontSize = 24; let fontBaseline = 150; let newFont;   function preload() {   newFont = loadFont("fonts/Montserrat.otf"); }   function setup() {   createCanvas(600, 300);     textFont(newFont);     // Create button to increase font size   let fontBtn = createButton("Increase Font Size");   fontBtn.mouseClicked(() => {     currfontSize += 1;   });   fontBtn.position(20, 70);     // Create input box   inputElem = createInput("");   inputElem.position(20, 40); }   function draw() {   clear();   textSize(18);   text("Write in input to change the text and observe text ascent", 10, 20);   textSize(currfontSize);     // This value depends on the font used   let fontScalar = 0.8;     // Display text and line if input not empty   let enteredText = inputElem.value();   if (enteredText != "") {     text(enteredText, 20, fontBaseline);       // Draw the Base line     stroke("black");     line(0, fontBaseline, width, fontBaseline);       // Draw the Ascent Line     stroke("green");     ascVal = textAscent() * fontScalar;     line(0, fontBaseline - ascVal, width, fontBaseline - ascVal);     noStroke();           textSize(18);     text("Text Ascent Value: " + ascVal, 20, 275);   } } |
Output:
Online editor: https://editor.p5js.org/
Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
Reference: https://p5js.org/reference/#/p5/textAscent
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