Maofeng
69 lines
1.7 KiB
TypeScript
69 lines
1.7 KiB
TypeScript
import {
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constrainCropperValue,
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getCoverScale,
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getCropArea,
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getCropperBounds,
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zoomCropperValueAtPoint,
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} from "@workspace/cropper"
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import { describe, expect, it } from "vitest"
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const viewport = { height: 300, width: 300 }
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const landscape = { height: 500, width: 1000 }
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describe("cropper geometry", () => {
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it("fits an image so the viewport is always covered", () => {
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expect(getCoverScale(viewport, landscape)).toBe(0.6)
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expect(getCropperBounds(viewport, landscape, 1)).toEqual({
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maxX: 150,
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maxY: 0,
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})
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})
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it("constrains zoom and translation to the covered image", () => {
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expect(
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constrainCropperValue(
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{ x: 5000, y: -500, zoom: 10 },
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{ image: landscape, maxZoom: 4, minZoom: 1, viewport }
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)
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).toEqual({ x: 1050, y: -450, zoom: 4 })
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})
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it("preserves an initial translation until dimensions are available", () => {
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expect(
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constrainCropperValue(
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{ x: 40, y: -20, zoom: 2 },
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{ image: { height: 0, width: 0 }, viewport }
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)
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).toEqual({ x: 40, y: -20, zoom: 2 })
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})
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it("returns a source-pixel crop rectangle", () => {
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expect(getCropArea({ x: 0, y: 0, zoom: 1 }, viewport, landscape)).toEqual({
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height: 500,
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width: 500,
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x: 250,
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y: 0,
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})
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expect(getCropArea({ x: 150, y: 0, zoom: 1 }, viewport, landscape)).toEqual(
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{
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height: 500,
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width: 500,
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x: 0,
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y: 0,
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}
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)
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})
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it("keeps the source point beneath the zoom origin stationary", () => {
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expect(
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zoomCropperValueAtPoint(
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{ x: 0, y: 0, zoom: 1 },
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2,
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{ x: 100, y: 0 },
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{ image: landscape, viewport }
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)
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).toEqual({ x: -100, y: 0, zoom: 2 })
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})
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})
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