63 lines
1.3 KiB
TypeScript
63 lines
1.3 KiB
TypeScript
// Some helpers for drawing SVGs.
|
|
|
|
import * as vec from "./vec"
|
|
import { getSweep } from "utils/utils"
|
|
|
|
// General
|
|
|
|
export function ellipse(A: number[], r: number) {
|
|
return `M ${A[0] - r},${A[1]}
|
|
a ${r},${r} 0 1,0 ${r * 2},0
|
|
a ${r},${r} 0 1,0 -${r * 2},0 `
|
|
}
|
|
|
|
export function moveTo(v: number[]) {
|
|
return `M ${v[0]},${v[1]} `
|
|
}
|
|
|
|
export function lineTo(v: number[]) {
|
|
return `L ${v[0]},${v[1]} `
|
|
}
|
|
|
|
export function line(a: number[], ...pts: number[][]) {
|
|
return moveTo(a) + pts.map((p) => lineTo(p)).join()
|
|
}
|
|
|
|
export function hLineTo(v: number[]) {
|
|
return `H ${v[0]},${v[1]} `
|
|
}
|
|
|
|
export function vLineTo(v: number[]) {
|
|
return `V ${v[0]},${v[1]} `
|
|
}
|
|
|
|
export function bezierTo(A: number[], B: number[], C: number[]) {
|
|
return `C ${A[0]},${A[1]} ${B[0]},${B[1]} ${C[0]},${C[1]} `
|
|
}
|
|
|
|
export function arcTo(C: number[], r: number, A: number[], B: number[]) {
|
|
return [
|
|
// moveTo(A),
|
|
"A",
|
|
r,
|
|
r,
|
|
0,
|
|
getSweep(C, A, B) > 0 ? "1" : "0",
|
|
0,
|
|
B[0],
|
|
B[1],
|
|
].join(" ")
|
|
}
|
|
|
|
export function closePath() {
|
|
return "Z"
|
|
}
|
|
|
|
export function rectTo(A: number[]) {
|
|
return ["R", A[0], A[1]].join(" ")
|
|
}
|
|
|
|
export function getPointAtLength(path: SVGPathElement, length: number) {
|
|
const point = path.getPointAtLength(length)
|
|
return [point.x, point.y]
|
|
}
|