Phase 4: Sketch-style curve editing with chart zoom, pan, tooltip toggle, and UI polish

.copilot-tracking/changes/20260219-sketch-style-editing-changes.md

@@ -0,0 +1,62 @@
+<!-- markdownlint-disable-file -->
+# Release Changes: Phase 4.0 Sketch-Style Curve Editing
+
+**Related Plan**: .github/planning/phase-4-plan.md (Section 0)
+**Implementation Date**: 2026-02-19
+
+## Summary
+
+Implements sketch-style curve editing on the chart, allowing users to click and drag to draw torque values directly onto a curve series. The mouse position is snapped to the nearest speed data point (X axis) and rounded to a configurable torque increment (Y axis, default 0.2).
+
+## Changes
+
+### Added
+
+- src/MotorEditor.Avalonia/ViewModels/ChartViewModel.cs - Added `SketchEditSeriesName`, `IsSketchEditActive`, `TorqueSnapIncrement` properties and `SetSketchEditSeries`, `ClearSketchEditSeries`, `ApplySketchPoint`, `FindNearestSpeedIndex`, `SnapTorque` methods for sketch-edit mode
+- src/MotorEditor.Avalonia/Views/ChartView.axaml.cs - Added `_isSketchDragging` state, `TryApplySketchAtPixel` helper, and sketch-edit handling in pointer event handlers
+- tests/CurveEditor.Tests/ViewModels/ChartViewModelTests.cs - Added 26 unit tests covering sketch-edit activation/deactivation, torque snapping, nearest speed index, and ApplySketchPoint behavior
+
+### Modified
+
+- src/MotorEditor.Avalonia/Models/UserPreferences.cs - Added `TorqueSnapIncrement` property (default 0.2) with clone support
+- src/MotorEditor.Avalonia/Views/ChartView.axaml - Added sketch-edit mode indicator overlay showing active series name
+- src/MotorEditor.Avalonia/Views/ChartView.axaml.cs - Extended pointer pressed/moved/released/capture-lost handlers to support sketch-edit drag interactions
+- src/MotorEditor.Avalonia/Views/CurveDataPanel.axaml - Added per-series ✏ sketch-edit toggle button in the column header
+- src/MotorEditor.Avalonia/Views/CurveDataPanel.axaml.cs - Added `OnSketchEditToggleClick` and `RefreshSketchEditToggles` handlers for sketch-edit toggle
+
+### Removed
+
+(none)
+
+## Release Summary
+
+**Total Files Affected**: 6
+
+### Files Created (0)
+
+(none)
+
+### Files Modified (6)
+
+- src/MotorEditor.Avalonia/Models/UserPreferences.cs - Added TorqueSnapIncrement preference
+- src/MotorEditor.Avalonia/ViewModels/ChartViewModel.cs - Added sketch-edit state management and point application logic
+- src/MotorEditor.Avalonia/Views/ChartView.axaml - Added sketch-edit mode indicator overlay
+- src/MotorEditor.Avalonia/Views/ChartView.axaml.cs - Added sketch-edit mouse interaction handling
+- src/MotorEditor.Avalonia/Views/CurveDataPanel.axaml - Added per-series sketch-edit toggle button in column header
+- src/MotorEditor.Avalonia/Views/CurveDataPanel.axaml.cs - Added sketch-edit toggle click handler and sibling refresh logic
+- tests/CurveEditor.Tests/ViewModels/ChartViewModelTests.cs - Added 26 unit tests for sketch-edit functionality
+
+### Files Removed (0)
+
+(none)
+
+### Dependencies & Infrastructure
+
+- **New Dependencies**: None
+- **Updated Dependencies**: None
+- **Infrastructure Changes**: None
+- **Configuration Updates**: None
+
+### Deployment Notes
+
+No special deployment considerations. The sketch-edit feature is purely additive and does not change existing behavior.

.github/planning/phase-4-plan.md

@@ -3,12 +3,12 @@
 ### 0. Sketch-Style Curve Editing
 - **Goal**: Enable simple, straightforward editing of a specified torque curve by clicking and dragging the mouse in the graph area.
 - **Steps**:
-  - [ ] Enable "Sketch edit" mode for a curve series. Only one curve series can be in sketch edit mode at a time.
-  - [ ] Implement a manner to track mouse position over the chart area in near-real time, in terms of x (speed), and y (torque).
-  - [ ] The speed component of the mouse position shall be rounded to the nearest speed data point in the chart field.
-  - [ ] The torque component of the mouse position shall be rounded to the nearest 0.2; this value shall be set-able in preferences.
-  - [ ] When the mouse is clicked while in the graph area, the curve with an active sketch-edit mode, will record the position of the mouse in the curve data, at the position of the x (speed) value in the dataset. E.g. if the mouse is nearest to 5% speed, and is nearest to 10.2 Nm and the user clicks, the curve series data should update such that at 5% speed that curve torque value is equal to 10.2 Nm.
-  - [ ] The user shall be able to click and drag the mouse over the graph, with the positions of the active sketch-edit curve being written to the curve data series as the mouse moves. Hence, the user could "sketch" over an image motor curve, cleaning up slight data errors very easily.  
+  - [X] Enable "Sketch edit" mode for a curve series. Only one curve series can be in sketch edit mode at a time.
+  - [X] Implement a manner to track mouse position over the chart area in near-real time, in terms of x (speed), and y (torque).
+  - [X] The speed component of the mouse position shall be rounded to the nearest speed data point in the chart field.
+  - [X] The torque component of the mouse position shall be rounded to the nearest 0.2; this value shall be set-able in preferences.
+  - [X] When the mouse is clicked while in the graph area, the curve with an active sketch-edit mode, will record the position of the mouse in the curve data, at the position of the x (speed) value in the dataset. E.g. if the mouse is nearest to 5% speed, and is nearest to 10.2 Nm and the user clicks, the curve series data should update such that at 5% speed that curve torque value is equal to 10.2 Nm.
+  - [X] The user shall be able to click and drag the mouse over the graph, with the positions of the active sketch-edit curve being written to the curve data series as the mouse moves. Hence, the user could "sketch" over an image motor curve, cleaning up slight data errors very easily.  
 
 ### 1. EQ-Style Curve Editing
 - **Goal**: Enable rich, EQ-style editing of torque curves directly on the chart while keeping the data grid and underlying models in sync.

src/MotorEditor.Avalonia/Models/UserPreferences.cs

@@ -43,6 +43,20 @@ public sealed class UserPreferences
     /// </summary>
     public bool ShowVoltageMaxSpeedLine { get; set; } = true;
 
+    /// <summary>
+    /// Torque snap increment used during sketch editing. The torque value
+    /// recorded when the user sketches on the chart is rounded to the
+    /// nearest multiple of this value. Defaults to 0.2.
+    /// </summary>
+    public decimal TorqueSnapIncrement { get; set; } = 0.2m;
+
+    /// <summary>
+    /// Drag sketch band width as a percent of nearest point spacing.
+    /// Lower values require the pointer to stay closer to each point while
+    /// click-hold-drag sketching. Defaults to 5%.
+    /// </summary>
+    public decimal SketchDragBandPercent { get; set; } = 5m;
+
     /// <summary>
     /// Creates a copy of the current preferences.
     /// </summary>
@@ -54,7 +68,9 @@ public UserPreferences Clone()
             Theme = Theme,
             CurveColors = new List<string>(CurveColors),
             ShowMotorRatedSpeedLine = ShowMotorRatedSpeedLine,
-            ShowVoltageMaxSpeedLine = ShowVoltageMaxSpeedLine
+            ShowVoltageMaxSpeedLine = ShowVoltageMaxSpeedLine,
+            TorqueSnapIncrement = TorqueSnapIncrement,
+            SketchDragBandPercent = SketchDragBandPercent
         };
     }
 }