85 lines
2.7 KiB
JavaScript
85 lines
2.7 KiB
JavaScript
/*
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This file is meant to be processed in the context of an asset bundler.
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Specifically the import of 'psimpl.wasm' is meant to be resolved by the
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corresponding path to that file. Configure a file loader to resolve .wasm
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files (e.g. Webpack: file-loader) accordingly.
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Otherwise you have to use the module factory 'psimple.js' manually and
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reproduce the steps from below to fit your build context. See example.html.
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Other than wrapping the memory handling for convenience this method also makes
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sure the module is only loaded once.
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*/
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import wasmModuleFactory from './psimpl.js'
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import wasmUrl from './psimpl.wasm'
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import { initEmscriptenModule } from '../../lib/wasm-util/initEmscripten.js'
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import {
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storeCoords,
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unflattenCoords
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} from '../../lib/wasm-util/coordinates.js'
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export async function simplify_nth_point(coords, n) {
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return await callSimplification('nth_point', coords, [n])
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}
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export async function simplify_radial_distance(coords, tol) {
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return await callSimplification('radial_distance', coords, [tol])
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}
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export async function simplify_perpendicular_distance(coords, tol, repeat) {
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const params = [tol, repeat]
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return await callSimplification('perpendicular_distance', coords, params)
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}
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export async function simplify_reumann_witkam(coords, tol) {
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return await callSimplification('reumann_witkam', coords, [tol])
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}
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export async function simplify_opheim(coords, minTol, maxTol) {
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return await callSimplification('opheim', coords, [minTol, maxTol])
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}
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export async function simplify_lang(coords, tol, lookAhead) {
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return await callSimplification('lang', coords, [tol, lookAhead])
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}
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export async function simplify_douglas_peucker(coords, tol) {
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return await callSimplification('douglas_peucker', coords, [tol])
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}
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export async function simplify_douglas_peucker_n(coords, count) {
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return await callSimplification('douglas_peucker_n', coords, [count])
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}
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async function callSimplification(name, coords, params) {
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if (!isSimplificationRoutine(name)) throw Error(`Routine ${name} not known`)
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const module = await getModule()
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const buffer = storeCoords(module, coords)
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const result = module[name](buffer, coords.length * 2, ...params)
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module._free(buffer)
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return unflattenCoords(result)
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}
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const simplificationRoutines = [
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'nth_point',
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'radial_distance',
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'perpendicular_distance',
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'reumann_witkam',
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'opheim',
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'lang',
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'douglas_peucker',
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'douglas_peucker_n'
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]
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function isSimplificationRoutine(name) {
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return simplificationRoutines.indexOf(name) !== -1
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}
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let emscriptenModule
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export async function getModule() {
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if (!emscriptenModule)
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emscriptenModule = initEmscriptenModule(wasmModuleFactory, wasmUrl)
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return await emscriptenModule
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}
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