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Dragon Fire
239 lines
7.4 KiB
JavaScript
239 lines
7.4 KiB
JavaScript
const { createCanvas } = require('canvas');
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module.exports = class CanvasUtil {
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static greyscale(ctx, x, y, width, height) {
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const data = ctx.getImageData(x, y, width, height);
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for (let i = 0; i < data.data.length; i += 4) {
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const brightness = (0.34 * data.data[i]) + (0.5 * data.data[i + 1]) + (0.16 * data.data[i + 2]);
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data.data[i] = brightness;
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data.data[i + 1] = brightness;
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data.data[i + 2] = brightness;
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}
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ctx.putImageData(data, x, y);
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return ctx;
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}
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static invert(ctx, x, y, width, height) {
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const data = ctx.getImageData(x, y, width, height);
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for (let i = 0; i < data.data.length; i += 4) {
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data.data[i] = 255 - data.data[i];
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data.data[i + 1] = 255 - data.data[i + 1];
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data.data[i + 2] = 255 - data.data[i + 2];
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}
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ctx.putImageData(data, x, y);
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return ctx;
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}
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static silhouette(ctx, x, y, width, height) {
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const data = ctx.getImageData(x, y, width, height);
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for (let i = 0; i < data.data.length; i += 4) {
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data.data[i] = 0;
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data.data[i + 1] = 0;
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data.data[i + 2] = 0;
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}
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ctx.putImageData(data, x, y);
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return ctx;
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}
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static sepia(ctx, x, y, width, height) {
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const data = ctx.getImageData(x, y, width, height);
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for (let i = 0; i < data.data.length; i += 4) {
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const brightness = (0.34 * data.data[i]) + (0.5 * data.data[i + 1]) + (0.16 * data.data[i + 2]);
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data.data[i] = brightness + 100;
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data.data[i + 1] = brightness + 50;
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data.data[i + 2] = brightness;
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}
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ctx.putImageData(data, x, y);
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return ctx;
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}
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static contrast(ctx, x, y, width, height) {
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const data = ctx.getImageData(x, y, width, height);
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const factor = (259 / 100) + 1;
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const intercept = 128 * (1 - factor);
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for (let i = 0; i < data.data.length; i += 4) {
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data.data[i] = (data.data[i] * factor) + intercept;
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data.data[i + 1] = (data.data[i + 1] * factor) + intercept;
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data.data[i + 2] = (data.data[i + 2] * factor) + intercept;
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}
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ctx.putImageData(data, x, y);
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return ctx;
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}
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static desaturate(ctx, level, x, y, width, height) {
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const data = ctx.getImageData(x, y, width, height);
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for (let i = 0; i < height; i++) {
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for (let j = 0; j < width; j++) {
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const dest = ((i * width) + j) * 4;
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const grey = Number.parseInt(
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(0.2125 * data.data[dest]) + (0.7154 * data.data[dest + 1]) + (0.0721 * data.data[dest + 2]), 10
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);
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data.data[dest] += level * (grey - data.data[dest]);
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data.data[dest + 1] += level * (grey - data.data[dest + 1]);
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data.data[dest + 2] += level * (grey - data.data[dest + 2]);
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}
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}
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ctx.putImageData(data, x, y);
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return ctx;
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}
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static distort(ctx, amplitude, x, y, width, height, strideLevel = 4) {
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const data = ctx.getImageData(x, y, width, height);
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const temp = ctx.getImageData(x, y, width, height);
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const stride = width * strideLevel;
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for (let i = 0; i < width; i++) {
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for (let j = 0; j < height; j++) {
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const xs = Math.round(amplitude * Math.sin(2 * Math.PI * 3 * (j / height)));
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const ys = Math.round(amplitude * Math.cos(2 * Math.PI * 3 * (i / width)));
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const dest = (j * stride) + (i * strideLevel);
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const src = ((j + ys) * stride) + ((i + xs) * strideLevel);
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data.data[dest] = temp.data[src];
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data.data[dest + 1] = temp.data[src + 1];
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data.data[dest + 2] = temp.data[src + 2];
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}
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}
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ctx.putImageData(data, x, y);
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return ctx;
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}
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static fishEye(ctx, level, x, y, width, height) {
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const frame = ctx.getImageData(x, y, width, height);
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const source = new Uint8Array(frame.data);
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for (let i = 0; i < frame.data.length; i += 4) {
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const sx = (i / 4) % frame.width;
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const sy = Math.floor(i / 4 / frame.width);
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const dx = Math.floor(frame.width / 2) - sx;
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const dy = Math.floor(frame.height / 2) - sy;
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const dist = Math.sqrt((dx * dx) + (dy * dy));
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const x2 = Math.round((frame.width / 2) - (dx * Math.sin(dist / (level * Math.PI) / 2)));
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const y2 = Math.round((frame.height / 2) - (dy * Math.sin(dist / (level * Math.PI) / 2)));
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const i2 = ((y2 * frame.width) + x2) * 4;
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frame.data[i] = source[i2];
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frame.data[i + 1] = source[i2 + 1];
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frame.data[i + 2] = source[i2 + 2];
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frame.data[i + 3] = source[i2 + 3];
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}
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ctx.putImageData(frame, x, y);
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return ctx;
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}
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static pixelize(ctx, canvas, image, level, x, y, width, height) {
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ctx.imageSmoothingEnabled = false;
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ctx.drawImage(image, x, y, width * level, height * level);
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ctx.drawImage(canvas, x, y, width * level, height * level, x, y, width, height);
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ctx.imageSmoothingEnabled = true;
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return ctx;
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}
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static motionBlur(ctx, image, x, y, width, height) {
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ctx.drawImage(image, x, y, width, height);
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ctx.globalAlpha = 0.2;
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for (let i = 0; i < 10; i += 2) ctx.drawImage(image, x + i, y, width, height);
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ctx.globalAlpha = 1;
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return ctx;
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}
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static hasAlpha(image) {
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const canvas = createCanvas(image.width, image.height);
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const ctx = canvas.getContext('2d');
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ctx.drawImage(image, 0, 0);
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const data = ctx.getImageData(0, 0, canvas.width, canvas.height);
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let hasAlphaPixels = false;
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for (let i = 3; i < data.data.length; i += 4) {
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if (data.data[i] < 255) {
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hasAlphaPixels = true;
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break;
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}
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}
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return hasAlphaPixels;
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}
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static drawImageWithTint(ctx, image, color, x, y, width, height) {
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const { fillStyle, globalAlpha } = ctx;
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ctx.fillStyle = color;
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ctx.drawImage(image, x, y, width, height);
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ctx.globalAlpha = 0.5;
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ctx.fillRect(x, y, width, height);
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ctx.fillStyle = fillStyle;
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ctx.globalAlpha = globalAlpha;
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return ctx;
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}
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static shortenText(ctx, text, maxWidth) {
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let shorten = false;
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while (ctx.measureText(`${text}...`).width > maxWidth) {
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if (!shorten) shorten = true;
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text = text.substr(0, text.length - 1);
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}
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return shorten ? `${text}...` : text;
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}
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static wrapText(ctx, text, maxWidth) {
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return new Promise(resolve => {
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if (ctx.measureText(text).width < maxWidth) return resolve([text]);
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if (ctx.measureText('W').width > maxWidth) return resolve(null);
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const words = text.split(' ');
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const lines = [];
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let line = '';
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while (words.length > 0) {
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let split = false;
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while (ctx.measureText(words[0]).width >= maxWidth) {
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const temp = words[0];
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words[0] = temp.slice(0, -1);
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if (split) {
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words[1] = `${temp.slice(-1)}${words[1]}`;
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} else {
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split = true;
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words.splice(1, 0, temp.slice(-1));
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}
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}
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if (ctx.measureText(`${line}${words[0]}`).width < maxWidth) {
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line += `${words.shift()} `;
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} else {
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lines.push(line.trim());
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line = '';
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}
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if (words.length === 0) lines.push(line.trim());
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}
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return resolve(lines);
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});
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}
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static centerImage(base, data) {
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const dataRatio = data.width / data.height;
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const baseRatio = base.width / base.height;
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let { width, height } = data;
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let x = 0;
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let y = 0;
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if (baseRatio < dataRatio) {
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height = data.height;
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width = base.width * (height / base.height);
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x = (data.width - width) / 2;
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y = 0;
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} else if (baseRatio > dataRatio) {
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width = data.width;
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height = base.height * (width / base.width);
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x = 0;
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y = (data.height - height) / 2;
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}
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return { x, y, width, height };
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}
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static centerImagePart(data, maxWidth, maxHeight, widthOffset, heightOffest) {
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let { width, height } = data;
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if (width > maxWidth) {
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const ratio = maxWidth / width;
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width = maxWidth;
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height *= ratio;
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}
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if (height > maxHeight) {
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const ratio = maxHeight / height;
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height = maxHeight;
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width *= ratio;
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}
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const x = widthOffset + ((maxWidth / 2) - (width / 2));
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const y = heightOffest + ((maxHeight / 2) - (height / 2));
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return { x, y, width, height };
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}
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};
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