chessground-haichess
Version:
lichess.org Chess UI
110 lines • 15.1 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.render = exports.anim = void 0;
const util = require("./util");
function anim(mutation, state) {
return state.animation.enabled ? animate(mutation, state) : render(mutation, state);
}
exports.anim = anim;
function render(mutation, state) {
const result = mutation(state);
state.dom.redraw();
return result;
}
exports.render = render;
function makePiece(key, piece) {
return {
key: key,
pos: util.key2pos(key),
piece: piece,
};
}
function closer(piece, pieces) {
return pieces.sort((p1, p2) => {
return util.distanceSq(piece.pos, p1.pos) - util.distanceSq(piece.pos, p2.pos);
})[0];
}
function computePlan(prevPieces, current) {
const anims = new Map(), animedOrigs = [], fadings = new Map(), missings = [], news = [], prePieces = new Map();
let curP, preP, vector;
for (const [k, p] of prevPieces) {
prePieces.set(k, makePiece(k, p));
}
for (const key of util.allKeys) {
curP = current.pieces.get(key);
preP = prePieces.get(key);
if (curP) {
if (preP) {
if (!util.samePiece(curP, preP.piece)) {
missings.push(preP);
news.push(makePiece(key, curP));
}
}
else
news.push(makePiece(key, curP));
}
else if (preP)
missings.push(preP);
}
for (const newP of news) {
preP = closer(newP, missings.filter(p => util.samePiece(newP.piece, p.piece)));
if (preP) {
vector = [preP.pos[0] - newP.pos[0], preP.pos[1] - newP.pos[1]];
anims.set(newP.key, vector.concat(vector));
animedOrigs.push(preP.key);
}
}
for (const p of missings) {
if (animedOrigs.indexOf(p.key) === -1)
fadings.set(p.key, p.piece);
}
return {
anims: anims,
fadings: fadings,
};
}
function step(state, now) {
const cur = state.animation.current;
if (cur === undefined) {
if (!state.dom.destroyed)
state.dom.redrawNow();
return;
}
const rest = 1 - (now - cur.start) * cur.frequency;
if (rest <= 0) {
state.animation.current = undefined;
state.dom.redrawNow();
}
else {
const ease = easing(rest);
for (const cfg of cur.plan.anims.values()) {
cfg[2] = cfg[0] * ease;
cfg[3] = cfg[1] * ease;
}
state.dom.redrawNow(true);
requestAnimationFrame((now = performance.now()) => step(state, now));
}
}
function animate(mutation, state) {
const prevPieces = new Map(state.pieces);
const result = mutation(state);
const plan = computePlan(prevPieces, state);
if (plan.anims.size || plan.fadings.size) {
const alreadyRunning = state.animation.current && state.animation.current.start;
state.animation.current = {
start: performance.now(),
frequency: 1 / state.animation.duration,
plan: plan,
};
if (!alreadyRunning)
step(state, performance.now());
}
else {
state.dom.redraw();
}
return result;
}
function easing(t) {
return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;
}
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{ State } from './state';\nimport * as util from './util';\nimport * as cg from './types';\n\nexport type Mutation<A> = (state: State) => A;\n\n// 0,1 animation goal\n// 2,3 animation current status\nexport type AnimVector = cg.NumberQuad;\n\nexport type AnimVectors = Map<cg.Key, AnimVector>;\n\nexport type AnimFadings = Map<cg.Key, cg.Piece>;\n\nexport interface AnimPlan {\n  anims: AnimVectors;\n  fadings: AnimFadings;\n}\n\nexport interface AnimCurrent {\n  start: DOMHighResTimeStamp;\n  frequency: cg.KHz;\n  plan: AnimPlan;\n}\n\nexport function anim<A>(mutation: Mutation<A>, state: State): A {\n  return state.animation.enabled ? animate(mutation, state) : render(mutation, state);\n}\n\nexport function render<A>(mutation: Mutation<A>, state: State): A {\n  const result = mutation(state);\n  state.dom.redraw();\n  return result;\n}\n\ninterface AnimPiece {\n  key: cg.Key;\n  pos: cg.Pos;\n  piece: cg.Piece;\n}\ntype AnimPieces = Map<cg.Key, AnimPiece>;\n\nfunction makePiece(key: cg.Key, piece: cg.Piece): AnimPiece {\n  return {\n    key: key,\n    pos: util.key2pos(key),\n    piece: piece,\n  };\n}\n\nfunction closer(piece: AnimPiece, pieces: AnimPiece[]): AnimPiece | undefined {\n  return pieces.sort((p1, p2) => {\n    return util.distanceSq(piece.pos, p1.pos) - util.distanceSq(piece.pos, p2.pos);\n  })[0];\n}\n\nfunction computePlan(prevPieces: cg.Pieces, current: State): AnimPlan {\n  const anims: AnimVectors = new Map(),\n    animedOrigs: cg.Key[] = [],\n    fadings: AnimFadings = new Map(),\n    missings: AnimPiece[] = [],\n    news: AnimPiece[] = [],\n    prePieces: AnimPieces = new Map();\n  let curP: cg.Piece | undefined, preP: AnimPiece | undefined, vector: cg.NumberPair;\n  for (const [k, p] of prevPieces) {\n    prePieces.set(k, makePiece(k, p));\n  }\n  for (const key of util.allKeys) {\n    curP = current.pieces.get(key);\n    preP = prePieces.get(key);\n    if (curP) {\n      if (preP) {\n        if (!util.samePiece(curP, preP.piece)) {\n          missings.push(preP);\n          news.push(makePiece(key, curP));\n        }\n      } else news.push(makePiece(key, curP));\n    } else if (preP) missings.push(preP);\n  }\n  for (const newP of news) {\n    preP = closer(\n      newP,\n      missings.filter(p => util.samePiece(newP.piece, p.piece))\n    );\n    if (preP) {\n      vector = [preP.pos[0] - newP.pos[0], preP.pos[1] - newP.pos[1]];\n      anims.set(newP.key, vector.concat(vector) as AnimVector);\n      animedOrigs.push(preP.key);\n    }\n  }\n  for (const p of missings) {\n    if (animedOrigs.indexOf(p.key) === -1) fadings.set(p.key, p.piece);\n  }\n\n  return {\n    anims: anims,\n    fadings: fadings,\n  };\n}\n\nfunction step(state: State, now: DOMHighResTimeStamp): void {\n  const cur = state.animation.current;\n  if (cur === undefined) {\n    // animation was canceled :(\n    if (!state.dom.destroyed) state.dom.redrawNow();\n    return;\n  }\n  const rest = 1 - (now - cur.start) * cur.frequency;\n  if (rest <= 0) {\n    state.animation.current = undefined;\n    state.dom.redrawNow();\n  } else {\n    const ease = easing(rest);\n    for (const cfg of cur.plan.anims.values()) {\n      cfg[2] = cfg[0] * ease;\n      cfg[3] = cfg[1] * ease;\n    }\n    state.dom.redrawNow(true); // optimisation: don't render SVG changes during animations\n    requestAnimationFrame((now = performance.now()) => step(state, now));\n  }\n}\n\nfunction animate<A>(mutation: Mutation<A>, state: State): A {\n  // clone state before mutating it\n  const prevPieces: cg.Pieces = new Map(state.pieces);\n\n  const result = mutation(state);\n  const plan = computePlan(prevPieces, state);\n  if (plan.anims.size || plan.fadings.size) {\n    const alreadyRunning = state.animation.current && state.animation.current.start;\n    state.animation.current = {\n      start: performance.now(),\n      frequency: 1 / state.animation.duration,\n      plan: plan,\n    };\n    if (!alreadyRunning) step(state, performance.now());\n  } else {\n    // don't animate, just render right away\n    state.dom.redraw();\n  }\n  return result;\n}\n\n// https://gist.github.com/gre/1650294\nfunction easing(t: number): number {\n  return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;\n}\n"]}