---
source_files:
  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.Graph/View/GraphView.xaml.cs
  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.Graph/View/TestDataView.xaml.cs
  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.Graph/View/TestDataSeriesView.xaml.cs
generated_at: "2026-04-17T15:54:31.440283+00:00"
model: "zai-org/GLM-5-FP8"
schema_version: 1
sha256: "00811c8a21090fcd"
---

# Documentation: DTS.Viewer.Graph Views

## 1. Purpose

This module provides WPF view components for graph and chart visualization within the DTS Viewer application. It contains three partial classes—`GraphView`, `TestDataView`, and `TestDataSeriesView`—that serve as code-behind files for their respective XAML views. These views implement interfaces from `DTS.Common.Interface` and provide chart rendering, user interaction handling, and export functionality (PDF and CSV) for test data series visualization.

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## 2. Public Interface

### GraphView
**Signature:** `public partial class GraphView : IGraphView`

- **`GraphView()`** - Constructor. Calls `InitializeComponent()` to load the XAML-defined UI.

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### TestDataView
**Signature:** `public partial class TestDataView : ITestDataView`

- **`TestDataView()`** - Constructor. Calls `InitializeComponent()` to load the XAML-defined UI.

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### TestDataSeriesView
**Signature:** `public partial class TestDataSeriesView : ITestDataSeriesView`

- **`TestDataSeriesView()`** - Constructor. Calls `InitializeComponent()` to load the XAML-defined UI.

- **`bool SaveReportToPDF(string directory)`** - Generates a PDF report containing the chart image and a gRMS data table. Returns `true` on success, `false` on failure. Creates the directory if it does not exist. Logs success/failure via `APILogger`.

- **`bool SaveReportToCSV(string directory)`** - Exports chart data to a CSV file with frequency and PSD values. Returns `true` on success, `false` on failure. Creates the directory if it does not exist. Logs success/failure via `APILogger`.

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### AxisExtension (Static Class)
**Signature:** `public static class AxisExtension`

- **`double GetDispMin(this Axis axis)`** - Extension method that calculates the displayed minimum value based on `ActualMin`, `ActualMax`, `Value`, and `Scale` properties.

- **`double GetDispMax(this Axis axis)`** - Extension method that calculates the displayed maximum value based on `ActualMin`, `ActualMax`, `Value`, and `Scale` properties.

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## 3. Invariants

- **`SaveReportToPDF`**: The `directory` parameter must not be null, empty, or whitespace; otherwise, a `DirectoryNotFoundException` is thrown.
- **`SaveReportToPDF`**: `MainChart.DataContext` must be castable to `TestDataSeriesViewModel`; a direct cast is performed without null checking.
- **`SaveReportToPDF`**: `GraphDataSeries` must contain at least one element (accesses `dataSeries[0]` for test setup name and test ID).
- **`SaveReportToCSV`**: All data series in `GraphDataSeries` must have `Xvalue` and `Yvalue` arrays of equal or greater length than