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v0.0.8

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add: $Image.resize()
This commit is contained in:
defaultkavy 2024-04-23 23:34:19 +08:00
parent b3f28dbf86
commit 36cca4765b
1 changed files with 27 additions and 2 deletions
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29
lib/node/$Image.ts
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@ -6,11 +6,36 @@ export class $Image extends $HTMLElement<HTMLImageElement> {
super('img', options);
}
async load(src: string): Promise<$Image> {
async load(src: Promise<string> | string): Promise<$Image> {
return new Promise(resolve => {
const $img = this.once('load', () => {
resolve($img)
}).src(src)
})
if (typeof src === 'string') $img.src(src);
else src.then(src => $img.src(src));
})
}
static resize(src: string | File, size: number | [number, number]): Promise<string> {
return new Promise(resolve => {
const img = new Image();
img.addEventListener('load', () => {
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
if (!context) throw '$Image.resize: context undefined';
const ratio = img.width / img.height;
const [landscape, portrait, square] = [ratio > 1, ratio < 1, ratio === 1];
const w = size instanceof Array ? size[0] : portrait ? size : size * ratio;
const h = size instanceof Array ? size[1] : landscape ? size : size / ratio;
canvas.height = h; canvas.width = w;
context.drawImage(img, 0, 0, w, h);
resolve(canvas.toDataURL());
}, {once: true})
if (src instanceof File) {
const fr = new FileReader()
fr.addEventListener('load', () => img.src = fr.result as string)
fr.readAsDataURL(src);
} else img.src = src;
})
}