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- import assert from 'node:assert/strict'
- import {
- IMAGE_PREVIEW_ZOOM_MIN,
- IMAGE_PREVIEW_ZOOM_MAX,
- IMAGE_PREVIEW_ZOOM_STEP,
- clampPreviewZoom,
- computeFitBaseScale,
- buildPreviewTransformCss
- } from '../src/utils/image-preview-transform.js'
- assert.equal(IMAGE_PREVIEW_ZOOM_MIN, 0.5)
- assert.equal(IMAGE_PREVIEW_ZOOM_MAX, 5)
- assert.equal(IMAGE_PREVIEW_ZOOM_STEP, 0.15)
- assert.equal(clampPreviewZoom(0.1), 0.5)
- assert.equal(clampPreviewZoom(9), 5)
- assert.equal(clampPreviewZoom(1.234), 1.23)
- // 未旋转：640x400 装入 320x200 → scale = 0.5
- assert.ok(
- Math.abs(computeFitBaseScale(640, 400, 0, 320, 200) - 0.5) < 1e-9
- )
- // 旋转 90°：外接 400x640 装入 320x200 → scale = min(320/400, 200/640) = 0.3125
- assert.ok(
- Math.abs(computeFitBaseScale(640, 400, 90, 320, 200) - 0.3125) < 1e-9
- )
- assert.equal(
- buildPreviewTransformCss(10, -20, 90, 0.5),
- 'translate(10px, -20px) rotate(90deg) scale(0.5)'
- )
- console.log('image-preview-transform ok')
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