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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,5 @@ | ||
| node_modules | ||
| /lerna-debug.log | ||
| /vite-example/dist | ||
| /.turbo | ||
| /.turbo | ||
| /vite-example/public/*.tif* |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,3 @@ | ||
| { | ||
| "commentTranslate.targetLanguage": "zh-CN" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| import { TypedArray } from "geotiff"; | ||
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| export type ResampleDataOptions = { | ||
| sourceWidth: number; | ||
| sourceHeight: number; | ||
| targetWidth: number; | ||
| targetHeight: number; | ||
| /** start from 0 to 1, examples: [0, 0, 0.5, 0.5] */ | ||
| window: [number, number, number, number]; | ||
| method?: 'bilinear' | 'nearest'; | ||
| buffer?: number; | ||
| } | ||
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| export function resampleNearest(data: TypedArray, options: ResampleDataOptions) { | ||
| const { sourceWidth, sourceHeight, targetWidth, targetHeight, window, buffer = 0 } = options; | ||
| const [x0, y0, x1, y1] = window; | ||
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| const effectiveSourceWidth = sourceWidth - 2 * buffer; | ||
| const effectiveSourceHeight = sourceHeight - 2 * buffer; | ||
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| const resampledData = copyNewSize(data, targetWidth, targetHeight); | ||
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| for (let y = 0; y < targetHeight; y++) { | ||
| for (let x = 0; x < targetWidth; x++) { | ||
| const col = buffer + ((effectiveSourceWidth * (x0 + x / targetWidth * (x1 - x0))) >>> 0); | ||
| const row = buffer + ((effectiveSourceHeight * (y0 + y / targetHeight * (y1 - y0))) >>> 0); | ||
| resampledData[y * targetWidth + x] = data[row * sourceWidth + col]; | ||
| } | ||
| } | ||
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| return resampledData; | ||
| } | ||
|
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| export function resampleData(data: TypedArray, options: ResampleDataOptions) { | ||
| const { method = 'nearest' } = options; | ||
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| switch (method) { | ||
| case "nearest": | ||
| return resampleNearest(data, options); | ||
| case "bilinear": | ||
| return resampleBilinear(data, options); | ||
| } | ||
| } | ||
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| export function copyNewSize(array: TypedArray, width: number, height: number, samplesPerPixel = 1) { | ||
| return new (Object.getPrototypeOf(array).constructor)(width * height * samplesPerPixel) as typeof array; | ||
| } | ||
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| function lerp(v0: number, v1: number, t: number) { | ||
| return ((1 - t) * v0) + (t * v1); | ||
| } | ||
|
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| /** | ||
| * Resample the input array using bilinear interpolation. | ||
| * @param data The input arrays to resample | ||
| * @param options The options for resampling | ||
| * @returns The resampled rasters | ||
| */ | ||
| export function resampleBilinear(data: TypedArray, options: ResampleDataOptions) { | ||
| const { sourceWidth, sourceHeight, targetWidth, targetHeight, window, buffer = 0 } = options; | ||
| const [x0, y0, x1, y1] = window; | ||
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| const windowWidth = x1 - x0; | ||
| const windowHeight = y1 - y0; | ||
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| const newArray = copyNewSize(data, targetWidth, targetHeight); | ||
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| const effectiveSourceWidth = sourceWidth - 2 * buffer; | ||
| const effectiveSourceHeight = sourceHeight - 2 * buffer; | ||
|
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| for (let y = 0; y < targetHeight; y++) { | ||
| const rawY = effectiveSourceHeight * (y0 + y / targetHeight * windowHeight) + buffer; | ||
| const yl = Math.floor(rawY); | ||
| const yh = Math.min(Math.ceil(rawY), sourceHeight - 1); | ||
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| for (let x = 0; x < targetWidth; x++) { | ||
| const rawX = effectiveSourceWidth * (x0 + x / targetWidth * windowWidth) + buffer; | ||
| const tx = rawX % 1; | ||
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| const xl = Math.floor(rawX); | ||
| const xh = Math.min(Math.ceil(rawX), sourceWidth - 1); | ||
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| const ll = data[(yl * sourceWidth) + xl]; | ||
| const hl = data[(yl * sourceWidth) + xh]; | ||
| const lh = data[(yh * sourceWidth) + xl]; | ||
| const hh = data[(yh * sourceWidth) + xh]; | ||
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| const value = lerp( | ||
| lerp(ll, hl, tx), | ||
| lerp(lh, hh, tx), | ||
| rawY % 1, | ||
| ); | ||
| newArray[(y * targetWidth) + x] = value; | ||
| } | ||
| } | ||
| return newArray; | ||
| } |
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