measure-text.js•1.17 kB
export function measureText(font, text) {
let x = 0;
for (let i = 0; i < text.length; i++) {
if (font.chars[text[i]]) {
const kerning = font.kernings[text[i]] && font.kernings[text[i]][text[i + 1]] ? font.kernings[text[i]][text[i + 1]] : 0;
x += (font.chars[text[i]].xadvance || 0) + kerning;
}
}
return x;
}
export function splitLines(font, text, maxWidth) {
const words = text.replace(/[\r\n]+/g, " \n").split(" ");
const lines = [];
let currentLine = [];
let longestLine = 0;
words.forEach(word => {
const line = [...currentLine, word].join(" ");
const length = measureText(font, line);
if (length <= maxWidth && !word.includes("\n")) {
if (length > longestLine) {
longestLine = length;
}
currentLine.push(word);
} else {
lines.push(currentLine);
currentLine = [word.replace("\n", "")];
}
});
lines.push(currentLine);
return {
lines,
longestLine
};
}
export function measureTextHeight(font, text, maxWidth) {
const {
lines
} = splitLines(font, text, maxWidth);
return lines.length * font.common.lineHeight;
}
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