// @class PolyLine
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const L = window.L
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L.Path.mergeOptions({
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// @option dashSpeed: Number
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// The speed of the dash array, in pixels per second
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dashSpeed: 0
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})
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var _originalBeforeAdd = L.Path.prototype.beforeAdd
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L.Path.include({
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beforeAdd: function (map) {
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_originalBeforeAdd.bind(this)(map)
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if (this.options.dashSpeed) {
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this._lastDashFrame = performance.now()
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this._dashFrame = L.Util.requestAnimFrame(this._onDashFrame.bind(this))
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}
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},
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_onDashFrame: function () {
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if (!this._renderer) {
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return
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}
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var now = performance.now()
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var dashOffsetDelta = (now - this._lastDashFrame) * this.options.dashSpeed / 1000
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this.options.dashOffset = Number(this.options.dashOffset || 0) + dashOffsetDelta
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this._renderer._updateStyle(this)
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this._lastDashFrame = performance.now()
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this._dashFrame = L.Util.requestAnimFrame(this._onDashFrame.bind(this))
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},
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_offDashFrame: function () {
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L.Util.cancelAnimFrame(this._dashFrame)
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},
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onRemove: function () {
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this._renderer._removePath(this)
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this._offDashFrame()
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}
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})
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// 针对Canvas添加dashOffset参数，解决Canvas下无法实现动态线问题
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L.Canvas.include({
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_updateDashArray: function (layer) {
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if (typeof layer.options.dashArray === 'string') {
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var parts = layer.options.dashArray.split(/[, ]+/)
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var dashArray = []
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var dashValue
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var i
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for (i = 0; i < parts.length; i++) {
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dashValue = Number(parts[i])
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// Ignore dash array containing invalid lengths
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if (isNaN(dashValue)) {
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return
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}
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dashArray.push(dashValue)
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}
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layer.options._dashArray = dashArray
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} else {
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layer.options._dashArray = layer.options.dashArray
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}
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if (layer.options.dashOffset) {
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layer.options._dashOffset = layer.options.dashOffset
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}
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},
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_fillStroke: function (ctx, layer) {
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debugger
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var options = layer.options
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if (options.fill) {
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ctx.globalAlpha = options.fillOpacity
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ctx.fillStyle = options.fillColor || options.color
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ctx.fill(options.fillRule || 'evenodd')
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}
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if (options.stroke && options.weight !== 0) {
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if (ctx.setLineDash) {
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ctx.setLineDash((layer.options && layer.options._dashArray) || [])
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}
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if (layer.options._dashOffset) {
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ctx.lineDashOffset = layer.options._dashOffset
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}
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ctx.globalAlpha = options.opacity
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ctx.lineWidth = options.weight
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ctx.strokeStyle = options.color
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ctx.lineCap = options.lineCap
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ctx.lineJoin = options.lineJoin
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ctx.stroke()
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}
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}
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})
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