transitive-js
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A tool for generating dynamic stylized transit maps that are easy to understand.
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<h1><a href="../../index.html">All files</a> / <a href="index.html">lib/labeler</a> labeledgegroup.js</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js"><span class="cstat-no" title="statement not covered" >import { forEach } from 'lodash'</span>
/**
* LabelEdgeGroup
*/
<span class="cstat-no" title="statement not covered" >export default class L</span>abelEdgeGroup {
<span class="fstat-no" title="function not covered" > constructor(r</span>enderedSegment) {
<span class="cstat-no" title="statement not covered" > this.renderedSegment = renderedSegment</span>
<span class="cstat-no" title="statement not covered" > this.renderedEdges = []</span>
}
<span class="fstat-no" title="function not covered" > addEdge(</span>rEdge) {
<span class="cstat-no" title="statement not covered" > this.renderedEdges.push(rEdge)</span>
<span class="cstat-no" title="statement not covered" > this.edgeIds = !this.edgeIds</span>
? rEdge.getId()
: this.edgeIds + ',' + rEdge.getId()
}
<span class="fstat-no" title="function not covered" > getLabelTextArray(</span>) {
const textArray = <span class="cstat-no" title="statement not covered" >[]</span>
<span class="cstat-no" title="statement not covered" > forEach(this.renderedSegment.pathSegment.getPatterns(), <span class="fstat-no" title="function not covered" >(p</span>attern) => {</span>
const shortName = <span class="cstat-no" title="statement not covered" >pattern.route.route_short_name</span>
<span class="cstat-no" title="statement not covered" > if (textArray.indexOf(shortName) === -1) <span class="cstat-no" title="statement not covered" >textArray.push(shortName)</span></span>
})
<span class="cstat-no" title="statement not covered" > return textArray</span>
}
/**
* Find the potential anchors for a label given a display and spacing.
* @param {Display} display
* @param {Number} spacing - spacing needed for label placement (i.e., label
* height with buffer)
*/
<span class="fstat-no" title="function not covered" > getLabelAnchors(</span>display, spacing) {
const labelAnchors = <span class="cstat-no" title="statement not covered" >[]</span>
const renderLen = <span class="cstat-no" title="statement not covered" >this.getRenderLength(display)</span>
// Determine how many anchors might fit along length.
const anchorCount = <span class="cstat-no" title="statement not covered" >Math.floor(renderLen / spacing)</span>
const pctSpacing = <span class="cstat-no" title="statement not covered" >spacing / renderLen</span>
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < anchorCount; i++) {</span>
// Calculate potential position of anchor.
const t =
<span class="cstat-no" title="statement not covered" > i % 2 === 0</span>
? 0.5 + (i / 2) * pctSpacing
: 0.5 - ((i + 1) / 2) * pctSpacing
// Attempt to find coordinate along path for potential anchor.
const coord = <span class="cstat-no" title="statement not covered" >this.coordAlongRenderedPath(t, display)</span>
<span class="cstat-no" title="statement not covered" > if (coord) <span class="cstat-no" title="statement not covered" >labelAnchors.push(coord)</span></span>
}
<span class="cstat-no" title="statement not covered" > return labelAnchors</span>
}
/**
* Get the coordinate located at a defined percentage along along a rendered path.
* @param {Number} t - a value between 0 and 1 representing the location of the
* point to be computed
* @param {Display} display
* @returns {Object} - the coordinate as an {x,y} Object
*/
<span class="fstat-no" title="function not covered" > coordAlongRenderedPath(</span>t, display) {
const renderLen = <span class="cstat-no" title="statement not covered" >this.getRenderLength(display)</span>
// Get location along path.
const loc = <span class="cstat-no" title="statement not covered" >t * renderLen</span>
// Iterate over each edge in path, accumulating distance as we go.
let cur = <span class="cstat-no" title="statement not covered" >0</span>
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < this.renderedEdges.length; i++) {</span>
const rEdge = <span class="cstat-no" title="statement not covered" >this.renderedEdges[i]</span>
const edgeRenderLen = <span class="cstat-no" title="statement not covered" >rEdge.graphEdge.getRenderLength(display)</span>
<span class="cstat-no" title="statement not covered" > if (loc <= cur + edgeRenderLen) {</span>
// If location is along this edge, find and return the position along
// the edge.
const t2 = <span class="cstat-no" title="statement not covered" >(loc - cur) / edgeRenderLen</span>
const coord = <span class="cstat-no" title="statement not covered" >rEdge.graphEdge.coordAlongEdge(</span>
t2,
rEdge.renderData,
display
)
<span class="cstat-no" title="statement not covered" > return coord</span>
}
<span class="cstat-no" title="statement not covered" > cur += edgeRenderLen</span>
}
}
/**
* Get the total render length for the edge group, which consists of the sum
* of each graph edge length.
*/
<span class="fstat-no" title="function not covered" > getRenderLength(</span>display) {
<span class="cstat-no" title="statement not covered" > if (!this.renderLength) {</span>
<span class="cstat-no" title="statement not covered" > this.renderLength = 0</span>
<span class="cstat-no" title="statement not covered" > forEach(this.renderedEdges, <span class="fstat-no" title="function not covered" >(r</span>Edge) => {</span>
<span class="cstat-no" title="statement not covered" > this.renderLength += rEdge.graphEdge.getRenderLength(display)</span>
})
}
<span class="cstat-no" title="statement not covered" > return this.renderLength</span>
}
}
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