Last active
May 30, 2025 03:14
-
-
Save jarbitlira/956b8a509617ba4ea3f7fcfdc572c82c to your computer and use it in GitHub Desktop.
Trace frames from image
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| const { Jimp, intToRGBA, colorDiff, RGBColor } = require('jimp'); | |
| (async () => { | |
| const frames = []; | |
| let backgroundColor; | |
| const image = await Jimp.read('./draw.jpg'); | |
| const imageWidth = image.width; | |
| const imageHeight = image.height; | |
| const getBackgroundColor = () => { | |
| let colors = new Map(); | |
| for (let x = 0; x < imageWidth; x++) { | |
| for (let y = 0; y < imageHeight; y++) { | |
| const pixelColor = image.getPixelColor(x, y); | |
| let counter = colors.get(pixelColor) ?? 0; | |
| counter++; | |
| colors.set(pixelColor, counter); | |
| } | |
| } | |
| let highestCounter = 0; | |
| let bgColor; | |
| for (let color of colors.keys()) { | |
| const currentColorCounter = colors.get(color); | |
| if (currentColorCounter >= highestCounter) { | |
| highestCounter = currentColorCounter; | |
| bgColor = color; | |
| } | |
| } | |
| return bgColor; | |
| } | |
| backgroundColor = getBackgroundColor(); | |
| const isBackgroundColor = (x, y) => { | |
| const result = colorDiff(intToRGBA(backgroundColor), intToRGBA(image.getPixelColor(x, y))); | |
| return !result; | |
| } | |
| const isInsideAFrame = (x, y) => { | |
| const frame = frames.find((frame) => { | |
| return ( | |
| x >= frame.x1 && | |
| x < frame.x2 && | |
| y >= frame.y1 && | |
| y < frame.y2 | |
| ); | |
| }); | |
| return !!frame; | |
| } | |
| const tracedPixels = new Set(); | |
| const getFrame = (initialX, initialY) => { | |
| const nearbyPixels = [[initialX, initialY]]; | |
| let minX = initialX; | |
| let maxX = initialX; | |
| let minY = initialY; | |
| let maxY = initialY; | |
| while (nearbyPixels.length > 0) { | |
| const [x, y] = nearbyPixels.pop(); | |
| const pixelKey = `${ x },${ y }`; | |
| if ( | |
| x < 0 || | |
| y < 0 || | |
| x >= imageWidth | |
| || | |
| y >= imageHeight || | |
| tracedPixels.has(pixelKey) | |
| ) { | |
| continue; | |
| } | |
| tracedPixels.add(pixelKey); | |
| if (isBackgroundColor(x, y)) { | |
| continue; | |
| } | |
| minX = Math.min(minX, x); | |
| maxX = Math.max(maxX, x); | |
| minY = Math.min(minY, y); | |
| maxY = Math.max(maxY, y); | |
| nearbyPixels.push( | |
| [x + 1, y], | |
| [x - 1, y], | |
| [x, y + 1], | |
| [x, y - 1], | |
| [x - 1, y - 1], | |
| [x - 1, y + 1], | |
| [x + 1, y - 1], | |
| [x + 1, y + 1], | |
| ); | |
| } | |
| return { | |
| x1: minX, | |
| y1: minY, | |
| x2: maxX, | |
| y2: maxY, | |
| width: maxX - minX + 1, | |
| height: maxY - minY + 1, | |
| } | |
| } | |
| for (let y = 0; y < imageHeight; y++) { | |
| for (let x = 0; x < imageWidth; x++) { | |
| const key = `${ x },${ y }`; | |
| if (!tracedPixels.has(key) && | |
| !isBackgroundColor(x, y) && | |
| !isInsideAFrame(x, y) | |
| ) { | |
| const frame = getFrame(x, y); | |
| frames.push(frame); | |
| } | |
| } | |
| } | |
| return frames; | |
| })() |
Author
jarbitlira
commented
May 30, 2025
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment