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refactor

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This commit is contained in:
kakkokari-gtyih 2024-12-16 11:37:59 +09:00
parent 7d80c2129b
commit 00a5b5b777
1 changed files with 4 additions and 3 deletions
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7
packages/frontend/src/scripts/watermark.ts
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@ -57,11 +57,12 @@ export async function applyWatermark(img: string | Blob, el: HTMLCanvasElement,
if (pattern) {
ctx.fillStyle = pattern;
if (config.rotate) {
const rotateRad = config.rotate * Math.PI / 180;
ctx.translate(canvas.width / 2, canvas.height / 2);
ctx.rotate(config.rotate * Math.PI / 180);
ctx.rotate(rotateRad);
ctx.translate(-canvas.width / 2, -canvas.height / 2);
const rotatedWidth = Math.abs(canvas.width * Math.cos(config.rotate * Math.PI / 180)) + Math.abs(canvas.height * Math.sin(config.rotate * Math.PI / 180));
const rotatedHeight = Math.abs(canvas.width * Math.sin(config.rotate * Math.PI / 180)) + Math.abs(canvas.height * Math.cos(config.rotate * Math.PI / 180));
const rotatedWidth = Math.abs(canvas.width * Math.cos(rotateRad)) + Math.abs(canvas.height * Math.sin(rotateRad));
const rotatedHeight = Math.abs(canvas.width * Math.sin(rotateRad)) + Math.abs(canvas.height * Math.cos(rotateRad));
const x = Math.abs(rotatedWidth - canvas.width) / -2;
const y = Math.abs(rotatedHeight - canvas.height) / -2;
ctx.fillRect(x, y, rotatedWidth, rotatedHeight);