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The skating rinks

sport: "skating" draws the ice of three disciplines, chosen by league: the standard 400 m speed skating track of the International Skating Union (isu-long-track, the default), the short track oval of 111.12 m on its rink (isu-short-track) and the figure skating rink (isu-figure). The long track has its two lanes, its warm-up lane, the blocks of its curves, the coaches' area, the finishing line and the starting lines of every race; the short track its seven blocks in each curve, its tracks and its starting positions; the figure skating rink its boards and the places of the judges. The figures are cited rule by rule in sources.md. They lie wide, with the score in the middle; orientation: "portrait" lays them tall.

import { drawKyogijo, RANGES } from "@johnmorrisdotca/kyogijo-stadiums";

const track = drawKyogijo({ sport: "skating" });
const start = drawKyogijo({ sport: "skating", league: "isu-short-track", range: "start" });
console.log(track.includes('data-sport="skating"'), start.match(/viewBox="([^"]*)"/)?.[1]);
// true 59.9 0.84 80.34 37.69
console.log(RANGES.skating.map((range) => range.id).join(", "));
// home-straight, crossing-straight, first-bend, second-bend, finish, start, infield, half, judges, kiss-and-cry

The long track#

The track is worked out from the radius of its inner edge and a lap of 400 m, as the ISU's table of measurements has it (Rule 227.1: the track is measured 0.5 m outside the inner edge). A skater changes lanes once a lap, on the crossing straight (Rule 254.5), so a lap is a straight, the inner curve, the crossing, the outer curve and a straight: f + sqrt(f² + 4²) + π (d + e) = 400, where d and e are the radii of the two lanes' lines.

The lines of the races are derived, not copied. A race's starting line is the race's distance back from its finishing line along the skater's own way, worked out for each lane, so that each lane's line stands where its own curves put it:

The numbers 6.32, 6.25, 7.32 and 12.57 are the layout plan's own dimensions (k, j, i and the difference of the curves); a test holds the derived lines to them.

import { finishAt, longOval, startOf } from "@johnmorrisdotca/kyogijo-stadiums/skating";

const oval = longOval();
console.log(oval.straight.toFixed(2), oval.crossing.toFixed(2), (oval.straight + Math.PI * oval.d + oval.crossing + Math.PI * oval.e).toFixed(1));
// 113.57 113.64 400.0
const finish = finishAt(oval, "400m");
console.log(startOf(oval, 0, 1500, finish, true).pose.x.toFixed(2), startOf(oval, 1, 3000, finish).pose.x.toFixed(2));
// 63.04 -36.91

The short track#

The oval is 111.12 m round: two straights of S = 28.85 m between the centres of the curves and a track line of C = R8.50 m; the blocks stand 0.5 m inside it, on R8.00 m, seven in each curve (Rule 280.4). The rink is at least 60 by 30 m (Rule 280.1a), the barrier at least 7 m from the line of the blocks (Rule 280.1b); a line is drawn between the last block of a curve and the first of the next (Rule 280.1g). Beside the standard track the diagram lays out four or six more, each moved along the straight (1.00 m for five tracks, 0.70 m for seven), with starting lines 2.00 m or 1.40 m apart: a track moved by δ starts the half-lap races 2δ along the straight, so that the single finishing line, in the middle of the finishing straight, is a half lap on. The 500 m (4½ laps) and the 1500 m (13½) start on the straight opposite the finishing line, the others (9, 18, 27 and 45 laps: the 1000 m, the mixed relay, the 3000 m and its relay, the 5000 m relay) at it. The finishing line is the width of the straight and 1.5 m more, the lines at most 2 cm wide (Rule 280.2), and the starting positions of the 500 m and the 1000 m are five dots every 1.3 m from 50 cm out from the inner side (Rule 280.2c).

The figure skating rink#

The skating area is rectangular, 60 m by 30 m if possible, not larger and not less than 56 m by 26 m (Rule 342.1), with the judges and the referee seated at the rinkboard and the technical panel, if possible, in an elevated position. furniture draws them beside the boards, and the kiss and cry; the Rules give no place and no size for them, nor a radius for the corners: those are ours.

Options#

Everything is optional. skating takes:

look is any look (the ice, the boards and the lines take the hockey rink's colours: the lanes' lines are the look's blue, the starting and finishing lines its red); line-drawing is ink only. The lines take the ISU's colours: blue for the lanes' demarcation, red for the starting, finishing and coaches' lines. range crops to a part: home-straight, crossing-straight, first-bend, second-bend, finish, start and infield on the long track; home-straight, crossing-straight, first-bend, second-bend, finish, start and infield on the short; half, judges and kiss-and-cry on the figure skating rink.

The data#

@johnmorrisdotca/kyogijo-stadiums/skating has five charts, each as the other charts are (draw, table, summary, totals, layers you can add to).

import { figureElements, skatingPairs } from "@johnmorrisdotca/kyogijo-stadiums/skating";

const pairs = skatingPairs([{ pair: 1, inner: { name: "A. Skater" }, outer: { name: "B. Skater" } }], { race: "1000m" });
console.log(pairs.title, "|", pairs.summary);
// Pairs, 1000 m | 2 skaters in the 1000 m, last pair: 1.
const elements = figureElements([{ kind: "jump", name: "3Lz", x: -12, y: 4, order: 1 }, { kind: "spin", name: "CCoSp4", x: 6, y: -3, order: 2 }]);
console.log(elements.totals.elements, elements.totals.kinds.jump);
// 2 1

Skating has its own frame, skating: metres from the middle of the rink, x along it and y down (frames). A heat layer counts into the zone set skating-track (the finishing straight, the first curve, the crossing straight, the second curve and the infield; a figure skating rink in thirds).

The Japanese words#

Where the Japan Skating Federation's own rule books are not on the web, the Japanese is the Japanese translation of the ISU's Special Regulations and Technical Rules Speed Skating (the 2018 edition, kept by the Aomori skating association), the Federation's teaching text (スピードスケート指導教本) and its viewing guide. Television's word, where it differs, is an alias.

The figure skating furniture (ジャッジ席, テクニカルパネル, レフェリー, キス・アンド・クライ) has no word in a rule book that could be read: it is the usual one.

What is ours#

The colours of the ice and of the looks; the corner of a figure skating rink and the places and sizes of the furniture; the padding's place (3 m from the edge, the Rules' clear distance, drawn 0.3 m thick); the spacing of the short track's seven blocks (30 degrees apart: the diagram shows seven and the Rules give no angle); the block's size as drawn; the short track's rink corner; the crossing as a straight line from the one lane to the other (the table's own model). The lap of the short track is 111.11 m as the diagram's S and C make it (the diagram prints 111.12 m). Not drawn: the warm-up lane's own markings (the Rules name none), the cones of a team race's changeover area and a relay's exchange zone, the lap counters and the officials' places on the long track.

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