chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
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+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+
+using System;
+using QuantConnect.Data.Market;
+
+namespace QuantConnect.Indicators
+{
+    /// <summary>
+    /// This indicator computes the True Range (TR).
+    /// The True Range is the greatest of the following values:
+    /// value1 = distance from today's high to today's low.
+    /// value2 = distance from yesterday's close to today's high.
+    /// value3 = distance from yesterday's close to today's low.
+    /// </summary>
+    public class TrueRange : BarIndicator, IIndicatorWarmUpPeriodProvider
+    {
+        private IBaseDataBar _previousInput;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TrueRange"/> class using the specified name.
+        /// </summary>
+        public TrueRange()
+            : base("TR")
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TrueRange"/> class using the specified name.
+        /// </summary>
+        /// <param name="name">The name of this indicator</param>
+        public TrueRange(string name)
+            : base(name)
+        {
+        }
+
+        /// <summary>
+        /// Gets a flag indicating when this indicator is ready and fully initialized
+        /// </summary>
+        public override bool IsReady => Samples > 1;
+
+        /// <summary>
+        /// Required period, in data points, for the indicator to be ready and fully initialized.
+        /// </summary>
+        public int WarmUpPeriod => 2;
+
+        /// <summary>
+        /// Computes the next value of this indicator from the given state
+        /// </summary>
+        /// <param name="input">The input given to the indicator</param>
+        /// <returns>A new value for this indicator</returns>
+        protected override decimal ComputeNextValue(IBaseDataBar input)
+        {
+            var greatest = input.High - input.Low;
+
+            if (!IsReady)
+            {
+                _previousInput = input;
+                return greatest;
+            }
+
+            var value2 = Math.Abs(_previousInput.Close - input.High);
+            if (value2 > greatest)
+                greatest = value2;
+
+            var value3 = Math.Abs(_previousInput.Close - input.Low);
+            if (value3 > greatest)
+                greatest = value3;
+
+            _previousInput = input;
+
+            return greatest;
+        }
+    }
+}