feat: 第一次上传代码

node_modules/lottie-web/player/js/utils/expressions/expressionHelpers.js

@@ -0,0 +1,86 @@
+import {
+  createTypedArray,
+} from '../helpers/arrays';
+import ExpressionManager from './ExpressionManager';
+
+const expressionHelpers = (function () {
+  function searchExpressions(elem, data, prop) {
+    if (data.x) {
+      prop.k = true;
+      prop.x = true;
+      prop.initiateExpression = ExpressionManager.initiateExpression;
+      prop.effectsSequence.push(prop.initiateExpression(elem, data, prop).bind(prop));
+    }
+  }
+
+  function getValueAtTime(frameNum) {
+    frameNum *= this.elem.globalData.frameRate;
+    frameNum -= this.offsetTime;
+    if (frameNum !== this._cachingAtTime.lastFrame) {
+      this._cachingAtTime.lastIndex = this._cachingAtTime.lastFrame < frameNum ? this._cachingAtTime.lastIndex : 0;
+      this._cachingAtTime.value = this.interpolateValue(frameNum, this._cachingAtTime);
+      this._cachingAtTime.lastFrame = frameNum;
+    }
+    return this._cachingAtTime.value;
+  }
+
+  function getSpeedAtTime(frameNum) {
+    var delta = -0.01;
+    var v1 = this.getValueAtTime(frameNum);
+    var v2 = this.getValueAtTime(frameNum + delta);
+    var speed = 0;
+    if (v1.length) {
+      var i;
+      for (i = 0; i < v1.length; i += 1) {
+        speed += Math.pow(v2[i] - v1[i], 2);
+      }
+      speed = Math.sqrt(speed) * 100;
+    } else {
+      speed = 0;
+    }
+    return speed;
+  }
+
+  function getVelocityAtTime(frameNum) {
+    if (this.vel !== undefined) {
+      return this.vel;
+    }
+    var delta = -0.001;
+    // frameNum += this.elem.data.st;
+    var v1 = this.getValueAtTime(frameNum);
+    var v2 = this.getValueAtTime(frameNum + delta);
+    var velocity;
+    if (v1.length) {
+      velocity = createTypedArray('float32', v1.length);
+      var i;
+      for (i = 0; i < v1.length; i += 1) {
+        // removing frameRate
+        // if needed, don't add it here
+        // velocity[i] = this.elem.globalData.frameRate*((v2[i] - v1[i])/delta);
+        velocity[i] = (v2[i] - v1[i]) / delta;
+      }
+    } else {
+      velocity = (v2 - v1) / delta;
+    }
+    return velocity;
+  }
+
+  function getStaticValueAtTime() {
+    return this.pv;
+  }
+
+  function setGroupProperty(propertyGroup) {
+    this.propertyGroup = propertyGroup;
+  }
+
+  return {
+    searchExpressions: searchExpressions,
+    getSpeedAtTime: getSpeedAtTime,
+    getVelocityAtTime: getVelocityAtTime,
+    getValueAtTime: getValueAtTime,
+    getStaticValueAtTime: getStaticValueAtTime,
+    setGroupProperty: setGroupProperty,
+  };
+}());
+
+export default expressionHelpers;