140 lines
4.7 KiB
JavaScript
140 lines
4.7 KiB
JavaScript
import { getVectorContext } from "ol/render";
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import Point from "ol/geom/Point";
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import { fromExtent } from 'ol/geom/Polygon';
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import { Style, Icon } from "ol/style";
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import { sizes, cacheStyle, makeBorderColor, makeCourseColor } from "./common";
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import network from "../../data/network.json";
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const courseStyle = cacheStyle(
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lineColor => {
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const icon = window.document.createElement("canvas");
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const shapeSize = sizes.courseSize;
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const iconSize = sizes.courseSize + sizes.courseOuterBorder;
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icon.width = iconSize;
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icon.height = iconSize;
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const cx = icon.width / 2;
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const cy = icon.height / 2;
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const iconCtx = icon.getContext("2d");
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for (const [color, size] of [
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[makeBorderColor(lineColor), sizes.courseOuterBorder],
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[lineColor, sizes.courseBorder],
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[makeCourseColor(lineColor), sizes.courseInnerBorder]
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]) {
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iconCtx.fillStyle = color;
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iconCtx.strokeStyle = color;
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iconCtx.lineWidth = size;
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iconCtx.lineJoin = "round";
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iconCtx.miterLimit = 200000;
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iconCtx.beginPath();
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iconCtx.moveTo(cx - 0.5 * shapeSize, cy - 0.3 * shapeSize);
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iconCtx.lineTo(cx + 0.5 * shapeSize, cy);
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iconCtx.lineTo(cx - 0.5 * shapeSize, cy + 0.3 * shapeSize);
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iconCtx.closePath();
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iconCtx.stroke();
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iconCtx.fill();
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}
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return new Style({
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image: new Icon({
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img: icon,
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imgSize: [icon.width, icon.height]
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})
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});
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},
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);
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export const setupCoursesAnimation = (
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map, coursesSimulation, stopsLayer, onClick
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) => {
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const view = map.getView();
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// Draw courses directly on the map
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map.on("postcompose", ev => {
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coursesSimulation.update();
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// The normal way to access a layer’s vector context is through the
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// `postrender` event of that layer. However, `postrender` is not
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// triggered when no feature of the layer is inside the current
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// bounding box, but we want to draw vehicles in between stops even
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// if no stop is visible. This hack listens to the global `postcompose`
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// event, which is always triggered at every frame, and reconstructs
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// the stops layer’s vector context from internal variables
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/* eslint-disable no-underscore-dangle */
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if (stopsLayer.renderer_) {
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ev.context = stopsLayer.renderer_.context;
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ev.inversePixelTransform =
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stopsLayer.renderer_.inversePixelTransform;
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/* eslint-enable no-underscore-dangle */
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const ctx = getVectorContext(ev);
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const bbox = fromExtent(map.getView().calculateExtent());
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bbox.scale(1.05);
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for (const course of Object.values(coursesSimulation.courses)) {
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if (!bbox.intersectsCoordinate(course.position)) {
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continue;
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}
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const point = new Point(course.position);
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const color = network.lines[course.line].color;
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const style = courseStyle(color);
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style.getImage().setRotation(
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view.getRotation() +
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course.angle
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);
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ctx.setStyle(style);
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ctx.drawGeometry(point);
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}
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}
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map.render();
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});
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map.on("singleclick", ev => {
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const mousePixel = map.getPixelFromCoordinate(ev.coordinate);
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const maxDistance = sizes.courseSize + sizes.courseInnerBorder;
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const clicked = [];
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for (const course of Object.values(coursesSimulation.courses)) {
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const coursePixel = map.getPixelFromCoordinate(course.position);
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const dx = mousePixel[0] - coursePixel[0];
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const dy = mousePixel[1] - coursePixel[1];
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const distance = dx * dx + dy * dy;
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if (distance <= maxDistance * maxDistance) {
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clicked.push(course.id);
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}
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}
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// Sort selected courses in increasing departing/arrival time
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clicked.sort((id1, id2) => {
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const course1 = coursesSimulation.courses[id1];
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const course2 = coursesSimulation.courses[id2];
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const time1 = (
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course1.state === "moving"
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? course1.arrivalTime
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: course1.departureTime
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);
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const time2 = (
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course2.state === "moving"
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? course2.arrivalTime
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: course2.departureTime
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);
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return time1 - time2;
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});
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onClick(clicked);
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});
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};
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