(frameTime, lag)
| 1235 | |
| 1236 | //帧绘制回调 |
| 1237 | function update(frameTime, lag) { |
| 1238 | if (!isRunning()) return; |
| 1239 | |
| 1240 | const width = stageW; |
| 1241 | const height = stageH; |
| 1242 | const timeStep = frameTime * simSpeed; |
| 1243 | const speed = simSpeed * lag; |
| 1244 | |
| 1245 | updateGlobals(timeStep, lag); |
| 1246 | |
| 1247 | const starDrag = 1 - (1 - Star.airDrag) * speed; |
| 1248 | const starDragHeavy = 1 - (1 - Star.airDragHeavy) * speed; |
| 1249 | const sparkDrag = 1 - (1 - Spark.airDrag) * speed; |
| 1250 | const gAcc = (timeStep / 1000) * GRAVITY; |
| 1251 | COLOR_CODES_W_INVIS.forEach((color) => { |
| 1252 | // 绘制星花 |
| 1253 | const stars = Star.active[color]; |
| 1254 | for (let i = stars.length - 1; i >= 0; i = i - 1) { |
| 1255 | const star = stars[i]; |
| 1256 | // Only update each star once per frame. Since color can change, it's possible a star could update twice without this, leading to a "jump". |
| 1257 | if (star.updateFrame === currentFrame) { |
| 1258 | continue; |
| 1259 | } |
| 1260 | star.updateFrame = currentFrame; |
| 1261 | |
| 1262 | star.life -= timeStep; |
| 1263 | //星花生命周期结束回收实例 |
| 1264 | if (star.life <= 0) { |
| 1265 | stars.splice(i, 1); |
| 1266 | Star.returnInstance(star); |
| 1267 | } else { |
| 1268 | const burnRate = Math.pow(star.life / star.fullLife, 0.5); |
| 1269 | const burnRateInverse = 1 - burnRate; |
| 1270 | |
| 1271 | star.prevX = star.x; |
| 1272 | star.prevY = star.y; |
| 1273 | star.x += star.speedX * speed; |
| 1274 | star.y += star.speedY * speed; |
| 1275 | // Apply air drag if star isn't "heavy". The heavy property is used for the shell comets. |
| 1276 | //如果星形不是“heavy”，应用空气阻力。重的性质被用于壳彗星。 |
| 1277 | if (!star.heavy) { |
| 1278 | star.speedX *= starDrag; |
| 1279 | star.speedY *= starDrag; |
| 1280 | } else { |
| 1281 | star.speedX *= starDragHeavy; |
| 1282 | star.speedY *= starDragHeavy; |
| 1283 | } |
| 1284 | star.speedY += gAcc; |
| 1285 | |
| 1286 | if (star.spinRadius) { |
| 1287 | star.spinAngle += star.spinSpeed * speed; |
| 1288 | star.x += Math.sin(star.spinAngle) * star.spinRadius * speed; |
| 1289 | star.y += Math.cos(star.spinAngle) * star.spinRadius * speed; |
| 1290 | } |
| 1291 | |
| 1292 | if (star.sparkFreq) { |
| 1293 | star.sparkTimer -= timeStep; |
| 1294 | while (star.sparkTimer < 0) { |
nothing calls this directly
no test coverage detected