File size: 7,648 Bytes
bf237c2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | import Path from "path";
import bMFont from "load-bmfont";
import { isNodePattern, throwError } from "@jimp/utils";
import { measureText, measureTextHeight, splitLines } from "./measure-text";
function xOffsetBasedOnAlignment(constants, font, line, maxWidth, alignment) {
if (alignment === constants.HORIZONTAL_ALIGN_LEFT) {
return 0;
}
if (alignment === constants.HORIZONTAL_ALIGN_CENTER) {
return (maxWidth - measureText(font, line)) / 2;
}
return maxWidth - measureText(font, line);
}
function drawCharacter(image, font, x, y, char) {
if (char.width > 0 && char.height > 0) {
const characterPage = font.pages[char.page];
image.blit(characterPage, x + char.xoffset, y + char.yoffset, char.x, char.y, char.width, char.height);
}
return image;
}
function printText(font, x, y, text, defaultCharWidth) {
for (let i = 0; i < text.length; i++) {
let char;
if (font.chars[text[i]]) {
char = text[i];
} else if (/\s/.test(text[i])) {
char = "";
} else {
char = "?";
}
const fontChar = font.chars[char] || {};
const fontKerning = font.kernings[char];
drawCharacter(this, font, x, y, fontChar || {});
const kerning = fontKerning && fontKerning[text[i + 1]] ? fontKerning[text[i + 1]] : 0;
x += kerning + (fontChar.xadvance || defaultCharWidth);
}
}
function loadPages(Jimp, dir, pages) {
const newPages = pages.map(page => {
return Jimp.read(dir + "/" + page);
});
return Promise.all(newPages);
}
const dir = process.env.DIRNAME || `${__dirname}/../`;
export default (() => ({
constants: {
measureText,
measureTextHeight,
FONT_SANS_8_BLACK: Path.join(dir, "fonts/open-sans/open-sans-8-black/open-sans-8-black.fnt"),
FONT_SANS_10_BLACK: Path.join(dir, "fonts/open-sans/open-sans-10-black/open-sans-10-black.fnt"),
FONT_SANS_12_BLACK: Path.join(dir, "fonts/open-sans/open-sans-12-black/open-sans-12-black.fnt"),
FONT_SANS_14_BLACK: Path.join(dir, "fonts/open-sans/open-sans-14-black/open-sans-14-black.fnt"),
FONT_SANS_16_BLACK: Path.join(dir, "fonts/open-sans/open-sans-16-black/open-sans-16-black.fnt"),
FONT_SANS_32_BLACK: Path.join(dir, "fonts/open-sans/open-sans-32-black/open-sans-32-black.fnt"),
FONT_SANS_64_BLACK: Path.join(dir, "fonts/open-sans/open-sans-64-black/open-sans-64-black.fnt"),
FONT_SANS_128_BLACK: Path.join(dir, "fonts/open-sans/open-sans-128-black/open-sans-128-black.fnt"),
FONT_SANS_8_WHITE: Path.join(dir, "fonts/open-sans/open-sans-8-white/open-sans-8-white.fnt"),
FONT_SANS_16_WHITE: Path.join(dir, "fonts/open-sans/open-sans-16-white/open-sans-16-white.fnt"),
FONT_SANS_32_WHITE: Path.join(dir, "fonts/open-sans/open-sans-32-white/open-sans-32-white.fnt"),
FONT_SANS_64_WHITE: Path.join(dir, "fonts/open-sans/open-sans-64-white/open-sans-64-white.fnt"),
FONT_SANS_128_WHITE: Path.join(dir, "fonts/open-sans/open-sans-128-white/open-sans-128-white.fnt"),
/**
* Loads a bitmap font from a file
* @param {string} file the file path of a .fnt file
* @param {function(Error, Jimp)} cb (optional) a function to call when the font is loaded
* @returns {Promise} a promise
*/
loadFont(file, cb) {
if (typeof file !== "string") return throwError.call(this, "file must be a string", cb);
return new Promise((resolve, reject) => {
cb = cb || function (err, font) {
if (err) reject(err);else resolve(font);
};
bMFont(file, (err, font) => {
const chars = {};
const kernings = {};
if (err) {
return throwError.call(this, err, cb);
}
for (let i = 0; i < font.chars.length; i++) {
chars[String.fromCharCode(font.chars[i].id)] = font.chars[i];
}
for (let i = 0; i < font.kernings.length; i++) {
const firstString = String.fromCharCode(font.kernings[i].first);
kernings[firstString] = kernings[firstString] || {};
kernings[firstString][String.fromCharCode(font.kernings[i].second)] = font.kernings[i].amount;
}
loadPages(this, Path.dirname(file), font.pages).then(pages => {
cb(null, {
chars,
kernings,
pages,
common: font.common,
info: font.info
});
});
});
});
}
},
class: {
/**
* Draws a text on a image on a given boundary
* @param {Jimp} font a bitmap font loaded from `Jimp.loadFont` command
* @param {number} x the x position to start drawing the text
* @param {number} y the y position to start drawing the text
* @param {any} text the text to draw (string or object with `text`, `alignmentX`, and/or `alignmentY`)
* @param {number} maxWidth (optional) the boundary width to draw in
* @param {number} maxHeight (optional) the boundary height to draw in
* @param {function(Error, Jimp)} cb (optional) a function to call when the text is written
* @returns {Jimp} this for chaining of methods
*/
print(font, x, y, text, maxWidth, maxHeight, cb) {
if (typeof maxWidth === "function" && typeof cb === "undefined") {
cb = maxWidth;
maxWidth = Infinity;
}
if (typeof maxWidth === "undefined") {
maxWidth = Infinity;
}
if (typeof maxHeight === "function" && typeof cb === "undefined") {
cb = maxHeight;
maxHeight = Infinity;
}
if (typeof maxHeight === "undefined") {
maxHeight = Infinity;
}
if (typeof font !== "object") {
return throwError.call(this, "font must be a Jimp loadFont", cb);
}
if (typeof x !== "number" || typeof y !== "number" || typeof maxWidth !== "number") {
return throwError.call(this, "x, y and maxWidth must be numbers", cb);
}
if (typeof maxWidth !== "number") {
return throwError.call(this, "maxWidth must be a number", cb);
}
if (typeof maxHeight !== "number") {
return throwError.call(this, "maxHeight must be a number", cb);
}
let alignmentX;
let alignmentY;
if (typeof text === "object" && text.text !== null && text.text !== undefined) {
alignmentX = text.alignmentX || this.constructor.HORIZONTAL_ALIGN_LEFT;
alignmentY = text.alignmentY || this.constructor.VERTICAL_ALIGN_TOP;
({
text
} = text);
} else {
alignmentX = this.constructor.HORIZONTAL_ALIGN_LEFT;
alignmentY = this.constructor.VERTICAL_ALIGN_TOP;
text = text.toString();
}
if (maxHeight !== Infinity && alignmentY === this.constructor.VERTICAL_ALIGN_BOTTOM) {
y += maxHeight - measureTextHeight(font, text, maxWidth);
} else if (maxHeight !== Infinity && alignmentY === this.constructor.VERTICAL_ALIGN_MIDDLE) {
y += maxHeight / 2 - measureTextHeight(font, text, maxWidth) / 2;
}
const defaultCharWidth = Object.entries(font.chars)[0][1].xadvance;
const {
lines,
longestLine
} = splitLines(font, text, maxWidth);
lines.forEach(line => {
const lineString = line.join(" ");
const alignmentWidth = xOffsetBasedOnAlignment(this.constructor, font, lineString, maxWidth, alignmentX);
printText.call(this, font, x + alignmentWidth, y, lineString, defaultCharWidth);
y += font.common.lineHeight;
});
if (isNodePattern(cb)) {
cb.call(this, null, this, {
x: x + longestLine,
y
});
}
return this;
}
}
}));
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