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feat(examples): add pixel-gradients example
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| # pixel-gradients | ||
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| [Live demo](http://demo.thi.ng/umbrella/pixel-gradients/) | ||
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| Please refer to the [example build instructions](https://github.com/thi-ng/umbrella/wiki/Example-build-instructions) on the wiki. | ||
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| ## Authors | ||
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| - Karsten Schmidt | ||
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| ## License | ||
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| © 2023 Karsten Schmidt // Apache Software License 2.0 |
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| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <link | ||
| rel="icon" | ||
| href='data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y=".9em" font-size="90">⛱️</text></svg>' | ||
| /> | ||
| <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" /> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | ||
| <meta http-equiv="X-UA-Compatible" content="ie=edge" /> | ||
| <title>pixel-gradients · @thi.ng/umbrella</title> | ||
| <link | ||
| href="https://unpkg.com/tachyons@4/css/tachyons.min.css" | ||
| rel="stylesheet" | ||
| /> | ||
| <style></style> | ||
| </head> | ||
| <body class="ma3 sans-serif"> | ||
| <div id="app"></div> | ||
| <div> | ||
| <a | ||
| class="link" | ||
| href="https://github.com/thi-ng/umbrella/tree/develop/examples/pixel-gradients" | ||
| >Source code</a | ||
| > | ||
| </div> | ||
| <script type="module" src="/src/index.ts"></script> | ||
| </body> | ||
| </html> |
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| { | ||
| "name": "@example/pixel-gradients", | ||
| "version": "0.0.1", | ||
| "private": true, | ||
| "description": "Randomized 4-point 2D color gradient image generator", | ||
| "repository": "https://github.com/thi-ng/umbrella", | ||
| "author": "Karsten Schmidt <[email protected]>", | ||
| "license": "Apache-2.0", | ||
| "scripts": { | ||
| "start": "vite --host --open", | ||
| "build": "tsc && vite build --base='./'", | ||
| "preview": "vite preview --host --open" | ||
| }, | ||
| "devDependencies": { | ||
| "typescript": "^5.2.2", | ||
| "vite": "^4.4.9" | ||
| }, | ||
| "dependencies": { | ||
| "@thi.ng/api": "workspace:^", | ||
| "@thi.ng/arrays": "workspace:^", | ||
| "@thi.ng/color": "workspace:^", | ||
| "@thi.ng/color-palettes": "workspace:^", | ||
| "@thi.ng/dl-asset": "workspace:^", | ||
| "@thi.ng/hiccup-html": "workspace:^", | ||
| "@thi.ng/pixel": "workspace:^", | ||
| "@thi.ng/random": "workspace:^", | ||
| "@thi.ng/rdom": "workspace:^", | ||
| "@thi.ng/rstream": "workspace:^" | ||
| }, | ||
| "browser": { | ||
| "process": false | ||
| }, | ||
| "thi.ng": { | ||
| "readme": [ | ||
| "arrays", | ||
| "color", | ||
| "color-palettes", | ||
| "dl-asset", | ||
| "hiccup-html", | ||
| "pixel", | ||
| "random", | ||
| "rdom" | ||
| ], | ||
| "screenshot": "examples/pixel-gradients.jpg" | ||
| } | ||
| } |
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| import { typedArrayOfVec } from "@thi.ng/api"; | ||
| import { shuffle } from "@thi.ng/arrays"; | ||
| import { | ||
| analog, | ||
| colorsFromRange, | ||
| colorsFromTheme, | ||
| convert, | ||
| } from "@thi.ng/color"; | ||
| import { asLCH } from "@thi.ng/color-palettes"; | ||
| import { downloadCanvas } from "@thi.ng/dl-asset"; | ||
| import { button, canvas, div, option, select } from "@thi.ng/hiccup-html"; | ||
| import { FLOAT_RGBA, floatBuffer } from "@thi.ng/pixel"; | ||
| import { SYSTEM, XsAdd, pickRandom, randomID } from "@thi.ng/random"; | ||
| import { $compile, $input, $inputTrigger } from "@thi.ng/rdom"; | ||
| import { stream } from "@thi.ng/rstream"; | ||
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| // default PRNG (aka Math.random wrapper) | ||
| const RND = SYSTEM; | ||
| // alternatively, use a seedable PRNG: | ||
| // const RND = new XsAdd(0xdecafbad); | ||
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| // selection of color theme IDs from https://thi.ng/color-palettes | ||
| // (will be used by `palette` strategy below...) | ||
| const THEMES = [46, 54, 100, 126, 139, 145, 184, 187, 191, 218]; | ||
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| // config options for obtaining color themes (see below) | ||
| const OPTS = { num: 4, variance: 0.05, rnd: RND }; | ||
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| // various implementations to choose base colors for the gradient | ||
| // all of the strategies return colors in LCH format | ||
| const STRATEGIES = { | ||
| // pick randomized colors from predefined color range descriptors | ||
| // see https://thi.ng/color readme for list of available options (and results) | ||
| range1: () => [...colorsFromRange("weak", OPTS)], | ||
| range2: () => [...colorsFromRange("cool", OPTS)], | ||
| range3: () => [...colorsFromRange("light", OPTS)], | ||
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| // pick randomized colors based on given weighted set of theme part specs. | ||
| // each part can specify a base CSS color and optionally a color range to | ||
| // modify/tint that color, as well as a weight to control how often colors | ||
| // from this theme part will be picked. weights are always relative to each | ||
| // other and do not need to sum to 1.0 | ||
| declarative: () => [ | ||
| // this theme will statistically contain 2x more aliceblue and mintcream | ||
| // than orange. shades of hotpink are 5x less likely to be picked... | ||
| // https://docs.thi.ng/umbrella/color/functions/colorsFromTheme.html | ||
| ...colorsFromTheme( | ||
| [ | ||
| ["cool", "aliceblue", 0.5], | ||
| ["soft", "mintcream", 0.5], | ||
| ["bright", "orange", 0.25], | ||
| ["hotpink", 0.1], | ||
| ], | ||
| OPTS | ||
| ), | ||
| ], | ||
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| // choose a random color theme, shuffle it and create slight variations of | ||
| // each color... | ||
| palette: () => | ||
| shuffle(asLCH(pickRandom(THEMES, RND)), 6, RND) | ||
| .slice(0, 4) | ||
| .map((x) => analog([], x, 0.1, RND)), | ||
| }; | ||
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| type Strategy = keyof typeof STRATEGIES; | ||
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| // reactive state vars (initially empty/valueless) | ||
| const strategy = stream<Strategy>(); | ||
| const download = stream<boolean>(); | ||
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| // add gradient image generation as subscription. each time a new value is | ||
| // pushed into the `strategy` stream, this subscription will run and generate a | ||
| // new image... | ||
| strategy.subscribe({ | ||
| next(id) { | ||
| const canvas = <HTMLCanvasElement>document.getElementById("main"); | ||
| // prettier-ignore | ||
| // pick new colors via chosen strategy, convert LCH -> sRGB | ||
| // (still all colors in floating point format) | ||
| const theme = STRATEGIES[id]().map((x) => convert([], x, "srgb", "lch")); | ||
| // prettier-ignore | ||
| // create a 2x2 float RGBA image, all (4) pixels pre-initialized w/ theme colors | ||
| // then resize image to canvas size using bicubic interpolation | ||
| // then copy pixels to canvas (incl. format conversion) | ||
| floatBuffer(2, 2, FLOAT_RGBA, typedArrayOfVec("f32", theme)) | ||
| .resize(canvas.width, canvas.height, "cubic") | ||
| .blitCanvas(canvas); | ||
| }, | ||
| }); | ||
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| // subscription for download trigger stream to, well... download the canvas | ||
| download.subscribe({ | ||
| next() { | ||
| downloadCanvas( | ||
| <HTMLCanvasElement>document.getElementById("main"), | ||
| `gradient-${randomID(4)}` | ||
| ); | ||
| }, | ||
| }); | ||
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| // compile & mount UI/DOM | ||
| $compile( | ||
| div( | ||
| {}, | ||
| div( | ||
| ".mb3", | ||
| {}, | ||
| // dropdown menu for theme strategies | ||
| select( | ||
| { onchange: $input(strategy), value: strategy }, | ||
| ...Object.keys(STRATEGIES).map((x) => option({ value: x }, x)) | ||
| ), | ||
| // prettier-ignore | ||
| // when clicked, simply retrigger with current strategy | ||
| // (deref() obtains the stream's current value) | ||
| button(".ml3", { onclick: () => strategy.next(strategy.deref()!) }, "Generate"), | ||
| // prettier-ignore | ||
| // $inputTrigger is a event handler to emit `true` on given stream | ||
| button(".ml3",{ onclick: $inputTrigger(download) }, "Download") | ||
| ), | ||
| canvas("#main", { width: 960, height: 540 }) | ||
| ) | ||
| ).mount(document.getElementById("app")!); | ||
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| // trigger generation of first gradient image | ||
| strategy.next("range1"); |
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| /// <reference types="vite/client" /> |
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| { | ||
| "extends": "../tsconfig.json", | ||
| "include": ["src/**/*"], | ||
| "compilerOptions": { | ||
| } | ||
| } |
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