69 lines
1.8 KiB
TypeScript
69 lines
1.8 KiB
TypeScript
import { current } from "immer"
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import { Data, DrawShape } 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 { getPage, simplify } from "utils/utils"
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import * as vec from "utils/vec"
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import commands from "state/commands"
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export default class BrushSession extends BaseSession {
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origin: number[]
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previous: number[]
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points: number[][]
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snapshot: DrawSnapshot
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shapeId: string
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constructor(data: Data, id: string, point: number[]) {
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super(data)
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this.shapeId = id
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this.origin = point
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this.previous = point
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this.points = []
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this.snapshot = getDrawSnapshot(data, id)
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const page = getPage(data)
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const shape = page.shapes[id]
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getShapeUtils(shape).translateTo(shape, point)
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}
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update = (data: Data, point: number[]) => {
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const { shapeId } = this
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const lp = vec.med(this.previous, point)
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this.points.push(vec.sub(lp, this.origin))
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this.previous = lp
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const page = getPage(data)
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const shape = page.shapes[shapeId]
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getShapeUtils(shape).setPoints!(shape, [...this.points])
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}
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cancel = (data: Data) => {
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const { shapeId, snapshot } = this
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const page = getPage(data)
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const shape = page.shapes[shapeId]
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getShapeUtils(shape).setPoints!(shape, snapshot.points)
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}
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complete = (data: Data) => {
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commands.draw(
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data,
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this.shapeId,
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this.snapshot.points,
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simplify(this.points, 0.1 / data.camera.zoom).map(([x, y]) => [
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Math.trunc(x * 100) / 100,
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Math.trunc(y * 100) / 100,
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])
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)
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}
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}
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export function getDrawSnapshot(data: Data, shapeId: string) {
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const page = getPage(current(data))
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const { points } = page.shapes[shapeId] as DrawShape
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return {
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points,
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}
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}
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export type DrawSnapshot = ReturnType<typeof getDrawSnapshot>
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