---
source_files:
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphMainView.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphChannelView.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphPropertyView.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/ITestDataView.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphPropertyViewModel.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/ITestDataSeriesView.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphView.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphViewModel.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/ITestDataViewModel.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/ITestDataSeriesViewModel.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphChannelViewModel.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/IGraphMainViewModel.cs
  - Common/DTS.CommonCore/Interface/DTS.Viewer/Graphs/ITestDataSeries.cs
generated_at: "2026-04-16T02:33:34.206978+00:00"
model: "Qwen/Qwen3-Coder-Next-FP8"
schema_version: 1
sha256: "99208da86b0faad5"
---

# Graph View Module Documentation

## 1. Purpose  
This module defines the interface contracts for the graphing subsystem within the DTS Viewer, enabling separation of concerns between UI views and their corresponding view models in a MVVM pattern. It provides a structured set of interfaces for managing graph displays, channel selection, test data series, and property views—supporting both time-domain and frequency-domain (FFT/PSD) visualization of test data. The interfaces collectively enable modular UI composition where graph-related functionality (e.g., channel grouping, cursor tracking, report export) is decoupled from implementation details.

## 2. Public Interface  

### Interfaces (View Layer)  
- **`IGraphMainView`**  
  Represents the main graph tab view. Inherits `IBaseView`. No additional members defined.

- **`IGraphChannelView`**  
  Represents the channel selection/view tab. Inherits `IBaseView`. No additional members defined.

- **`IGraphPropertyView`**  
  Represents the property display tab. Inherits `IBaseView`. No additional members defined.

- **`ITestDataView`**  
  Represents the test data tab. Inherits `IBaseView`. No additional members defined.

- **`ITestDataSeriesView`**  
  Represents the view for a single test data series. Inherits `IBaseView`.  
  - `bool SaveReportToPDF(string directory)` – Saves the series report to PDF in the specified directory.  
  - `bool SaveReportToCSV(string directory)` – Saves the series report to CSV in the specified directory.

- **`IGraphView`**  
  Represents the main graph display view. Inherits `IBaseView`.  
  - *Commented-out method*: `void SetGraphs(ObservableCollection<ITestDataSeries> graphs);` — Not active in current interface.

### Interfaces (ViewModel Layer)  
- **`IGraphMainViewModel`**  
  Manages the main graph view and channel/group selection logic. Inherits `IBaseViewModel`.  
  - `IGraphMainView View { get; set; }`  
  - `IBaseViewModel Parent { get; set; }`  
  - `List<ITestChannel> LockedChannelList { get; set; }`  
  - `List<ITestChannel> SelectedChannelList { get; set; }`  
  - `string LockedGroupName { get; set; }`  
  - `void PublishSelectedChannels()` – Commits selected channels for display.  
  - `void AddSelectedChannel(ITestChannel channel)` – Adds a single channel to the selected list.  
  - `void AddSelectedGroupChannels(string groupName, List<ITestChannel> channels)` – Adds a group of channels to the selected list.  
  - `void AddLockedChannel(ITestChannel channel, bool isLocked)` – Adds a channel to the locked list; `isLocked` indicates lock status.  
  - `void AddLockedGroupChannels(string testName, string groupName, List<ITestChannel> channels, bool isLocked)` – Adds a group of channels to the locked list.  
  - `void GraphList_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)` – Handles collection change events for the graph list.

- **`IGraphChannelViewModel`**  
  Manages channel selection and grouping for graphing. Inherits `IBaseViewModel`.  
  - `IGraphChannelView View { get; }`  
  - `ObservableCollection<ITestChannel> GraphChannelList { get; set; }`  
  - `ObservableCollection<ITestChannel> SelectedGraphChannelList { get; set; }`  
  - `TestChannel SelectedGraphChannel { get; set; }`

- **`IGraphPropertyViewModel`**  
  Manages property view. Inherits `IBaseViewModel`.  
  - `IGraphPropertyView View { get; }`

- **`IGraphViewModel`**  
  Coordinates the main graph view and its data series view. Inherits `IBaseViewModel`.  
  - `IGraphView View { get; }`  
  - `ITestDataSeriesView DataSeriesView { get; set; }`

- **`ITestDataViewModel`**  
  Manages a single test data series view. Inherits `IBaseViewModel`.  
  - `ITestDataView View { get; set; }`  
  - `ITestDataSeries Model { get; set; }`

- **`ITestDataSeriesViewModel`**  
  Manages a single test data series view and cursor interaction. Inherits `IBaseViewModel`.  
  - `ITestDataSeriesView View { get; set; }`  
  - `ITestDataSeries Model { get; set; }`  
  - `void MoveCursor(object sender, KeyEventArgs e)` – Handles cursor movement (e.g., keyboard navigation).  
  - `string CurrentCursorValues { get; set; }` – Holds the current cursor position values (e.g., X/Y coordinates).

## 3. Invariants  
- All view interfaces (`IGraph*View`, `ITestData*View`) inherit `IBaseView`, implying a consistent base contract for UI components.  
- All view model interfaces (`IGraph*ViewModel`, `ITestData*ViewModel`) inherit `IBaseViewModel`, implying a consistent base contract for view models.  
- Each view model exposes a strongly-typed `View` property (e.g., `IGraphView`, `ITestDataSeriesView`)—ensuring one-to-one view/viewmodel pairing.  
- `ITestDataSeries` implements metadata properties (e.g., `TestGroup`, `ChannelName`, `EngineeringUnits`) and computed statistics (`MinY`, `MaxY`, `AvgY`, `StdDevY`, `PeakFrequency`, `PeakMagnitude`, `GRMS`)—some conditional on `FFT` or `PSD` mode.  
- `ITestDataSeries.FFT` indicates whether the series is frequency-domain data; `PeakFrequency` and `PeakMagnitude` are only populated when `FFT == true`.  
- `ITestDataSeries.HIC` is a boolean flag; `HICValue` is a string (likely formatted value).  
- `ITestDataSeries.GRMS` is only calculated in PSD results graphs (per documentation).  
- `ITestDataSeries.Description`, `SensorSNDisplay`, `MinY`, `MaxY`, `AvgY`, `StdDevY`, `T1Time`, `T2Time`, `RecordingMode` are read-only (`get;` only).  
- `ITestDataSeriesViewModel.MoveCursor` uses WPF’s `KeyEventArgs`, implying keyboard-based cursor interaction.

## 4. Dependencies  
### Internal Dependencies  
- **`DTS.Common.Base`** – All interfaces depend on `IBaseView` and `IBaseViewModel` from this namespace.  
- **`DTS.Common.Events`** – `ITestDataSeriesView` depends on this (though no event types are used in the provided snippet).  
- **`DTS.Common.Classes.Viewer.TestMetadata`** – `IGraphChannelViewModel` depends on `TestChannel` (imported from this namespace).  
- **`System.Collections.Generic`**, **`System.Collections.ObjectModel`**, **`System.Collections.Specialized`**, **`System.Windows.Input`**, **`System.Windows.Media`** – Used for collections, commands, and UI types.

### External Dependencies  
- **WPF** – Indicated by use of `KeyEventArgs`, `ObservableCollection<T>`, and `Brush`.  
- **Unknown types**: `ITestChannel`, `ITestDataSeries`, `TestChannel` — referenced but not defined in this module; must be defined elsewhere (likely in `DTS.Common.Classes.Viewer.TestMetadata` or similar).

## 5. Gotchas  
- **`IGraphView.SetGraphs(...)` is commented out** — The method signature exists only as a comment, suggesting incomplete or deprecated functionality. Do not assume this method is implemented or callable.  
- **`ITestDataSeries` metadata is mixed**: Some properties are read-only (`Description`, `SensorSNDisplay`, `MinY`, etc.), others are read-write (`TestGroup`, `ChannelName`, etc.). Ensure consumers respect mutability.  
- **`ITestDataSeriesViewModel.MoveCursor` uses WPF types** — This implies tight coupling to WPF; non-WPF UI implementations may require adaptation or stubbing.  
- **`ITestDataSeriesViewModel.CurrentCursorValues` is a string** — Its format is not specified; consumers must agree on parsing/formatting (e.g., `"X: 1.23, Y: 4.56"`).  
- **`ITestDataSeriesViewModel.Model` is of type `ITestDataSeries`** — The interface name matches the model type, but the property is named `Model`, not `TestDataSeries`. Ensure consistency in naming.  
- **Namespace consistency via `// ReSharper disable CheckNamespace`** — Indicates intentional namespace alignment across files; do not assume additional namespace nesting.  
- **No explicit validation or error handling** — Interfaces do not define exception behavior or validation rules; these are likely implementation-specific.  
- **`ITestDataSeriesView.SaveReportToPDF` and `SaveReportToCSV` return `bool`** — Success/failure semantics are not documented; callers must infer meaning (e.g., `true` = success, `false` = failure or cancellation).  
- **`IGraphMainViewModel` uses `List<ITestChannel>` for locked/selected lists** — Not thread-safe; concurrent modifications may cause issues if not externally synchronized.  
- **`LockedGroupName` and `TestName` parameters in `AddLockedGroupChannels`** — Ambiguity: `testName` is used in locked group context but `groupName` is used elsewhere for grouping; ensure naming consistency across consumers.