66 lines
1.7 KiB
TypeScript
66 lines
1.7 KiB
TypeScript
import { current } from 'immer'
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import { Bounds, Data } from 'types'
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import BaseSession from './base-session'
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import { getShapeUtils } from 'lib/shape-utils'
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import { getBoundsFromPoints, getShapes } from 'utils/utils'
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import * as vec from 'utils/vec'
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export default class BrushSession extends BaseSession {
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origin: number[]
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snapshot: BrushSnapshot
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constructor(data: Data, point: number[]) {
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super(data)
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this.origin = vec.round(point)
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this.snapshot = getBrushSnapshot(data)
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}
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update = (data: Data, point: number[]) => {
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const { origin, snapshot } = this
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const brushBounds = getBoundsFromPoints([origin, point])
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for (let id in snapshot.shapeHitTests) {
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const test = snapshot.shapeHitTests[id]
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if (test(brushBounds)) {
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if (!data.selectedIds.has(id)) {
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data.selectedIds.add(id)
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}
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} else if (data.selectedIds.has(id)) {
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data.selectedIds.delete(id)
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}
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}
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data.brush = brushBounds
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}
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cancel = (data: Data) => {
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data.brush = undefined
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data.selectedIds = new Set(this.snapshot.selectedIds)
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}
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complete = (data: Data) => {
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data.brush = undefined
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}
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}
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/**
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* Get a snapshot of the current selected ids, for each shape that is
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* not already selected, the shape's id and a test to see whether the
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* brush will intersect that shape. For tests, start broad -> fine.
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*/
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export function getBrushSnapshot(data: Data) {
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return {
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selectedIds: new Set(data.selectedIds),
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shapeHitTests: Object.fromEntries(
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getShapes(current(data)).map((shape) => [
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shape.id,
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(bounds: Bounds) => getShapeUtils(shape).hitTestBounds(shape, bounds),
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])
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),
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}
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}
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export type BrushSnapshot = ReturnType<typeof getBrushSnapshot>
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