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import { delimiter } from '../modules/core/regex.js'
import { extend } from '../utils/adopter.js'
import { subClassArray } from './ArrayPolyfill.js'
import SVGArray from './SVGArray.js'
const PointArray = subClassArray('PointArray', SVGArray)
export default PointArray
extend(PointArray, {
// Convert array to string
toString () {
// convert to a poly point string
for (var i = 0, il = this.length, array = []; i < il; i++) {
array.push(this[i].join(','))
}
return array.join(' ')
},
// Convert array to line object
toLine () {
return {
x1: this[0][0],
y1: this[0][1],
x2: this[1][0],
y2: this[1][1]
}
},
// Get morphed array at given position
at (pos) {
// make sure a destination is defined
if (!this.destination) return this
// generate morphed point string
for (var i = 0, il = this.length, array = []; i < il; i++) {
array.push([
this[i][0] + (this.destination[i][0] - this[i][0]) * pos,
this[i][1] + (this.destination[i][1] - this[i][1]) * pos
])
}
return new PointArray(array)
},
// Parse point string and flat array
parse (array = [ [ 0, 0 ] ]) {
var points = []
// if it is an array
if (array instanceof Array) {
// and it is not flat, there is no need to parse it
if (array[0] instanceof Array) {
return array
}
} else { // Else, it is considered as a string
// parse points
array = array.trim().split(delimiter).map(parseFloat)
}
// validate points - https://svgwg.org/svg2-draft/shapes.html#DataTypePoints
// Odd number of coordinates is an error. In such cases, drop the last odd coordinate.
if (array.length % 2 !== 0) array.pop()
// wrap points in two-tuples
for (var i = 0, len = array.length; i < len; i = i + 2) {
points.push([ array[i], array[i + 1] ])
}
return points
},
// transform points with matrix (similar to Point.transform)
transform (m) {
const points = []
for (let i = 0; i < this.length; i++) {
const point = this[i]
// Perform the matrix multiplication
points.push([
m.a * point[0] + m.c * point[1] + m.e,
m.b * point[0] + m.d * point[1] + m.f
])
}
// Return the required point
return new PointArray(points)
},
// Move point string
move (x, y) {
var box = this.bbox()
// get relative offset
x -= box.x
y -= box.y
// move every point
if (!isNaN(x) && !isNaN(y)) {
for (var i = this.length - 1; i >= 0; i--) {
this[i] = [ this[i][0] + x, this[i][1] + y ]
}
}
return this
},
// Resize poly string
size (width, height) {
var i
var box = this.bbox()
// recalculate position of all points according to new size
for (i = this.length - 1; i >= 0; i--) {
if (box.width) this[i][0] = ((this[i][0] - box.x) * width) / box.width + box.x
if (box.height) this[i][1] = ((this[i][1] - box.y) * height) / box.height + box.y
}
return this
},
// Get bounding box of points
bbox () {
var maxX = -Infinity
var maxY = -Infinity
var minX = Infinity
var minY = Infinity
this.forEach(function (el) {
maxX = Math.max(el[0], maxX)
maxY = Math.max(el[1], maxY)
minX = Math.min(el[0], minX)
minY = Math.min(el[1], minY)
})
return { x: minX, y: minY, width: maxX - minX, height: maxY - minY }
}
})
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