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index.js
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index.js
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const { createCanvas, registerFont } = require("canvas");
const { fillTextWithTwemoji, strokeTextWithTwemoji, measureText } = require("./emojiCanvasText");
// Fonts
registerFont(__dirname + "/fonts/RobotoBlack.ttf", { family: "Roboto" });
registerFont(__dirname + "/fonts/Matoran.ttf", { family: "Matoran" });
registerFont(__dirname + "/fonts/Impact.ttf", { family: "Impact Condensed" });
function canvasText(
text,
fontSize,
fontFamily,
width,
align = "center",
lineSpacing = 1.5,
fillStyle = "black",
bg = "transparent",
strokeStyle = "transparent",
lineWidth = 0
) {
return new Promise(async (resolve, reject) => {
// Init canvas
let maxHeight = 16384;
const canvas = createCanvas(width, maxHeight);
const ctx = canvas.getContext("2d");
if (bg != "transparent") {
// Handle background colour
ctx.fillStyle = bg;
ctx.fillRect(0, 0, canvas.width, canvas.height);
}
// Text styling
ctx.strokeStyle = strokeStyle
ctx.lineWidth = lineWidth;
ctx.lineJoin="miter";
ctx.miterLimit=2;
ctx.fillStyle = fillStyle;
ctx.textAlign = align;
ctx.font = fontSize + "px " + fontFamily;
let startX = 0;
if (align == "center") startX = width / 2;
let lineHeight = lineSpacing * fontSize; // Calculate line height
let lines = await printAtWordWrap(
ctx,
text,
startX,
fontSize,
lineHeight,
width
); // Print text on canvas, returns number of lines
resolve([
await canvas.toBuffer(),
lineHeight * lines > maxHeight ? maxHeight : lineHeight * lines,
]); // Resolve canvas image buffer and used height
});
}
function printAtWordWrap(context, text, x, y, lineHeight, fitWidth) {
return new Promise(async (resolve, reject) => {
fitWidth = fitWidth || 0;
let forcedLines = text.split("\n"); // Create new lines where they exist in the input text
if (fitWidth <= 0 && forcedLines.length <= 1) {
await strokeTextWithTwemoji(context, text, x, y, {
emojiTopMarginPercent: 0.1,
}); // Strokes text using Twemoji support
await fillTextWithTwemoji(context, text, x, y, {
emojiTopMarginPercent: 0.1,
}); // Fills text using Twemoji support
resolve(0);
}
var currentLine = 0; // Init number of lines
for (let l = 0; l < forcedLines.length; l++) {
var words = forcedLines[l].split(" ");
var idx = 1;
while (words.length > 0 && idx <= words.length) {
var str = words.slice(0, idx).join(" ");
var w = measureText(context, str).width; // Measure text, replacing discord custom emojis with the clown emoji
if (w > fitWidth || words[0] == "\n") {
if (idx == 1) {
idx = 2;
}
await strokeTextWithTwemoji(
context,
words.slice(0, idx - 1).join(" "),
lineHeight,
x,
y + lineHeight * currentLine,
{ emojiTopMarginPercent: 0.15 }
); // Strokes text using Twemoji support
await fillTextWithTwemoji(
context,
words.slice(0, idx - 1).join(" "),
lineHeight,
x,
y + lineHeight * currentLine,
{ emojiTopMarginPercent: 0.15 }
); // Fills text using Twemoji support
currentLine++;
words = words.splice(idx - 1);
idx = 1;
} else {
idx++;
}
}
if (idx > 0)
await strokeTextWithTwemoji(
context,
words.join(" "),
lineHeight,
x,
y + lineHeight * currentLine,
{ emojiTopMarginPercent: 0.15 }
); // Strokes text using Twemoji support
await fillTextWithTwemoji(
context,
words.join(" "),
lineHeight,
x,
y + lineHeight * currentLine,
{ emojiTopMarginPercent: 0.15 }
); // Fills text using Twemoji support
currentLine++;
}
resolve(currentLine); // Resolve number of lines
});
}
function canvasRect(
width,
height,
strokeStyle = "white",
strokeWidth = 4,
fillStyle = "black"
) {
return new Promise(async (resolve, reject) => {
try {
// Init canvas
const canvas = createCanvas(width, height);
const ctx = canvas.getContext("2d");
// Draw outline
ctx.beginPath();
ctx.rect(0, 0, width, height);
ctx.fillStyle = strokeStyle;
ctx.fill();
// Clear area within outline
ctx.clearRect(
strokeWidth,
strokeWidth,
width - strokeWidth * 2,
height - strokeWidth * 2
);
// Draw filled rect
ctx.beginPath();
ctx.rect(
strokeWidth,
strokeWidth,
width - strokeWidth * 2,
height - strokeWidth * 2
);
ctx.fillStyle = fillStyle;
ctx.fill();
resolve(await canvas.toBuffer()); // Resolve canvas image buffer
} catch (e) {
reject(e);
}
});
}
function canvasWindow(
width,
height,
x,
y,
holeWidth,
holeHeight,
strokeStyle = "white",
strokeWidth = 4,
strokeOffset = 0,
fillStyle = "black"
) {
return new Promise(async (resolve, reject) => {
try {
// Init canvas
const canvas = createCanvas(width, height);
const ctx = canvas.getContext("2d");
// Background
ctx.fillStyle = fillStyle;
ctx.fillRect(0, 0, width, height);
// Outline
ctx.rect(0, 0, width, height);
ctx.strokeStyle = strokeStyle;
ctx.lineWidth = strokeWidth;
ctx.strokeRect(
x - strokeOffset,
y - strokeOffset,
holeWidth + strokeOffset * 2,
holeHeight + strokeOffset * 2
);
// Cut hole ("window")
ctx.clearRect(x, y, holeWidth, holeHeight);
resolve(await canvas.toBuffer()); // Resolve canvas image buffer
} catch (e) {
reject(e);
}
});
}
module.exports = {
canvasText,
canvasRect,
canvasWindow,
};