iridium/neko
2
2
Fork 0
mirror of https://github.com/m1k1o/neko.git synced 2024-07-24 14:40:50 +12:00
Code Issues Packages Projects Releases Wiki Activity

tentative cursor movement support.

Browse Source
This commit is contained in:
Miroslav Šedivý 2021-11-14 20:51:08 +01:00
parent dfd7bec140
commit b902747b18
1 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
src/component/utils/canvas-movement.ts
View File

@ -6,13 +6,22 @@ export interface Point {
}
// movement: percent is 0-1
export function getMovementXYatPercent(points: Point[], percent: number): Point {
if (points.length == 0) { console.error('no points specified'); return { x:0, y:0 } }
if (points.length == 1) return points[0]
if (points.length == 2) return getLineXYatPercent(points[0], points[1], percent)
if (points.length == 3) return getQuadraticBezierXYatPercent(points[0], points[1], points[2], percent)
if (points.length == 4) return getCubicBezierXYatPercent(points[0], points[1], points[2], points[3], percent)
console.error('max 4 points supported'); return points[4]
export function getMovementXYatPercent(p: Point[], percent: number): Point {
const len = p.length
if (len == 0) {
console.error('getMovementXYatPercent: no points specified');
return { x:0, y:0 }
}
if (len == 1) return p[0]
if (len == 2) return getLineXYatPercent(p[0], p[1], percent)
if (len == 3) return getQuadraticBezierXYatPercent(p[0], p[1], p[2], percent)
if (len == 4) return getCubicBezierXYatPercent(p[0], p[1], p[2], p[3], percent)
// TODO: Support more than 4 points
if (len-1 % 3 == 0) return getCubicBezierXYatPercent(p[0], p[(len-1)/3], p[((len-1)/3)*2], p[len-1], percent)
else if (len-1 % 2 == 0) return getQuadraticBezierXYatPercent(p[0], p[(len-1)/2], p[len-1], percent)
else return getLineXYatPercent(p[0], p[len-1], percent)
}
// line: percent is 0-1