/**
* @description Abstract the polyline formed by N points into a set of bezier curve
* @param {Array} polyline A set of points that make up a polyline
* @param {Boolean} close Closed curve
* @param {Number} offsetA Smoothness
* @param {Number} offsetB Smoothness
* @return {Array|Boolean} A set of bezier curve (Invalid input will return false)
*/
function polylineToBezierCurve (polyline, close = false, offsetA = 0.25, offsetB = 0.25) {
if (!(polyline instanceof Array)) {
console.error('polylineToBezierCurve: Parameter polyline must be an array!')
return false
}
if (polyline.length <= 2) {
console.error('polylineToBezierCurve: Converting to a curve requires at least 3 points!')
return false
}
const startPoint = polyline[0]
const bezierCurveLineNum = polyline.length - 1
const bezierCurvePoints = new Array(bezierCurveLineNum).fill(0).map((foo, i) =>
[...getBezierCurveLineControlPoints(polyline, i, close, offsetA, offsetB), polyline[i + 1]])
if (close) closeBezierCurve(bezierCurvePoints, startPoint)
bezierCurvePoints.unshift(polyline[0])
return bezierCurvePoints
}
/**
* @description Get the control points of the Bezier curve
* @param {Array} polyline A set of points that make up a polyline
* @param {Number} index The index of which get controls points's point in polyline
* @param {Boolean} close Closed curve
* @param {Number} offsetA Smoothness
* @param {Number} offsetB Smoothness
* @return {Array} Control points
*/
function getBezierCurveLineControlPoints (polyline, index, close = false, offsetA = 0.25, offsetB = 0.25) {
const pointNum = polyline.length
if (pointNum < 3 || index >= pointNum) return
let beforePointIndex = index - 1
if (beforePointIndex < 0) beforePointIndex = (close ? pointNum + beforePointIndex : 0)
let afterPointIndex = index + 1
if (afterPointIndex >= pointNum) afterPointIndex = (close ? afterPointIndex - pointNum : pointNum - 1)
let afterNextPointIndex = index + 2
if (afterNextPointIndex >= pointNum) afterNextPointIndex = (close ? afterNextPointIndex - pointNum : pointNum - 1)
const pointBefore = polyline[beforePointIndex]
const pointMiddle = polyline[index]
const pointAfter = polyline[afterPointIndex]
const pointAfterNext = polyline[afterNextPointIndex]
return [
[
pointMiddle[0] + offsetA * (pointAfter[0] - pointBefore[0]),
pointMiddle[1] + offsetA * (pointAfter[1] - pointBefore[1])
],
[
pointAfter[0] - offsetB * (pointAfterNext[0] - pointMiddle[0]),
pointAfter[1] - offsetB * (pointAfterNext[1] - pointMiddle[1])
]
]
}
/**
* @description Get the last curve of the closure
* @param {Array} bezierCurve A set of sub-curve
* @param {Array} startPoint Start point
* @return {Array} The last curve for closure
*/
function closeBezierCurve (bezierCurve, startPoint) {
const firstSubCurve = bezierCurve[0]
const lastSubCurve = bezierCurve.slice(-1)[0]
bezierCurve.push([
getSymmetryPoint(lastSubCurve[1], lastSubCurve[2]),
getSymmetryPoint(firstSubCurve[0], startPoint),
startPoint
])
return bezierCurve
}
/**
* @description Get the symmetry point
* @param {Array} point Symmetric point
* @param {Array} centerPoint Symmetric center
* @return {Array} Symmetric point
*/
function getSymmetryPoint (point, centerPoint) {
const [px, py] = point
const [cx, cy] = centerPoint
const minusX = cx - px
const minusY = cy - py
return [cx + minusX, cy + minusY]
}
export default polylineToBezierCurve
PANIC: session(release): write data/sessions/4/1/418aa2b9e7adcb75: no space left on device
PANIC
session(release): write data/sessions/4/1/418aa2b9e7adcb75: no space left on device
/root/go/pkg/mod/github.com/go-macaron/session@v0.0.0-20190805070824-1a3cdc6f5659/session.go:199 (0x8bc0f8)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/context.go:81 (0x83623b)
/root/go/pkg/mod/github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:157 (0x80b5f4)
/root/go/pkg/mod/github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:135 (0x80b51c)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/context.go:125 (0x8363b2)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/context.go:115 (0x8473a6)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/recovery.go:161 (0x84739d)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/logger.go:40 (0x839a24)
/root/go/pkg/mod/github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:157 (0x80b5f4)
/root/go/pkg/mod/github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:135 (0x80b51c)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/context.go:125 (0x8363b2)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/router.go:187 (0x8412dd)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/router.go:304 (0x8423ec)
/root/go/pkg/mod/gopkg.in/macaron.v1@v1.5.0/macaron.go:218 (0x83adde)
/usr/local/btgo/src/net/http/server.go:2936 (0x7b23b5)
serverHandler.ServeHTTP: handler.ServeHTTP(rw, req)
/usr/local/btgo/src/net/http/server.go:1995 (0x7add91)
(*conn).serve: serverHandler{c.server}.ServeHTTP(w, w.req)
/usr/local/btgo/src/runtime/asm_amd64.s:1598 (0x47e160)
goexit: BYTE $0x90 // NOP