# Corner Curvature

## Overview

The Corner Curvature Customization feature provides a range of properties and methods to adjust the curvature of the panel's corners. Developers can set unique radii for each corner using dedicated properties or apply a unified radius to all corners via a single method. This flexibility ensures that panels can be seamlessly integrated into various design contexts—whether a sharply defined rectangular look is needed or a fully rounded, soft appearance.

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### Key Points

The following table summarizes the key elements of the Corner Curvature Customization feature:

| Aspect                  | Description                                                                                                               | Example/Default Value                 |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------------- | ------------------------------------- |
| Individual Corner Radii | Properties for each corner allow independent adjustment of the top-left, top-right, bottom-left, and bottom-right curves. | `CornerRadiusTopLeft = 10f` (default) |
| Unified Corner Radius   | A method to set the same radius for all corners simultaneously, ensuring consistency across the panel's borders.          | `SetCornerRadius(10f)`                |
| Value Constraints       | Negative values are automatically set to 0 to avoid invalid configurations.                                               | Any value < 0 is adjusted to 0        |

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### Code Examples and Samples

#### Basic Example: Setting Individual Corner Radii

Below is an example of how to create a panel with different corner radii for each corner:

```csharp
// Create a new instance of SiticonePanel with custom individual corner radii
var customCornerPanel = new SiticonePanel
{
    Width = 300,
    Height = 200,
    FillColor = Color.White,
    ShowBorder = true,
    BorderThickness = 2,
    CornerRadiusTopLeft = 15f,
    CornerRadiusTopRight = 5f,
    CornerRadiusBottomLeft = 20f,
    CornerRadiusBottomRight = 10f
};

// Add the panel to the form
this.Controls.Add(customCornerPanel);
```

#### Unified Corner Radius Example

This sample demonstrates applying the same curvature to all corners using the provided method:

```csharp
// Create a panel and set a unified corner radius for all corners
var unifiedCornerPanel = new SiticonePanel
{
    Width = 300,
    Height = 200,
    FillColor = Color.LightGray,
    ShowBorder = true,
    BorderThickness = 3
};

// Apply a uniform corner radius to all corners
unifiedCornerPanel.SetCornerRadius(12f);

// Add the panel to the form
this.Controls.Add(unifiedCornerPanel);
```

#### Dynamic Corner Adjustment Example

This example shows how you can update the corner curvature dynamically at runtime, for instance, in response to a user action:

```csharp
// Event handler to update corner curvature on button click
private void btnUpdateCorners_Click(object sender, EventArgs e)
{
    // Assume dynamicPanel is an instance of SiticonePanel already added to the form
    dynamicPanel.CornerRadiusTopLeft = 20f;
    dynamicPanel.CornerRadiusTopRight = 20f;
    dynamicPanel.CornerRadiusBottomLeft = 5f;
    dynamicPanel.CornerRadiusBottomRight = 5f;
    
    // Force a redraw of the panel to apply the new curvature
    dynamicPanel.Invalidate();
}
```

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### Best Practices

The table below outlines best practices when implementing corner curvature customization:

| Practice                                 | Details                                                                                                                | Sample Implementation                            |
| ---------------------------------------- | ---------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------ |
| Use Consistent Values for Uniform Design | When a uniform look is desired, use the SetCornerRadius method to ensure all corners have identical curvature.         | `panel.SetCornerRadius(10f);`                    |
| Validate Input Values                    | Ensure the provided values are non-negative to avoid unexpected behavior; the control handles negatives automatically. | Check values before assignment if needed.        |
| Test Across Different Panel Sizes        | Verify that the selected corner radii look balanced on various panel dimensions.                                       | Experiment with different values on test panels. |

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### Common Pitfalls

| Pitfall                      | Description                                                                               | How to Avoid                                                 |
| ---------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------ |
| Inconsistent Corner Radii    | Setting dramatically different values for adjacent corners may create visual imbalance.   | Aim for a harmonious design by testing various combinations. |
| Overly Large Corner Radii    | Excessively high values might lead to overlapping curves, especially on smaller panels.   | Scale the corner radius relative to the panel’s size.        |
| Forgetting to Refresh the UI | Changes to corner properties may not reflect until the panel is invalidated or refreshed. | Call `Invalidate()` after updating corner properties.        |

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### Usage Scenarios

| Scenario                        | Description                                                                                                    | Example Code                                                                       |
| ------------------------------- | -------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- |
| Standard Panels                 | For standard user interfaces where subtle rounding adds a modern look without detracting from content clarity. | See "Basic Example: Setting Individual Corner Radii" above.                        |
| Themed and Branded Applications | When a specific visual style or branding requires consistent, rounded elements across UI components.           | Use `SetCornerRadius()` to ensure all panels adhere to the same design guidelines. |
| Dynamic UI Interactions         | For applications where the panel shape changes in response to user actions or application state changes.       | Refer to "Dynamic Corner Adjustment Example" above.                                |

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### Review

The Corner Curvature Customization feature offers comprehensive control over the visual shape of the panel. By providing individual properties for each corner as well as a unified method for setting all corners simultaneously, developers can achieve both nuanced and consistent designs. The clear guidelines and detailed examples ensure that the implementation is both flexible and straightforward, making it an invaluable tool for UI development.

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### Summary

Corner Curvature Customization in the panel control empowers developers to adjust the roundedness of the panel's corners either individually or uniformly. This feature is designed to support a wide range of design requirements, from subtle rounding for modern interfaces to pronounced curves for distinctive visual styles. Extensive code samples, best practices, and usage scenarios facilitate the seamless integration and dynamic customization of panel shapes.

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### Conclusion

This documentation for Corner Curvature Customization is derived exclusively from the provided code and serves as a comprehensive guide for developers looking to integrate and tailor the panel control's corner styling in their .NET WinForms applications. By following the detailed examples, best practices, and usage scenarios, developers can ensure that their panel designs are both attractive and consistent with modern UI standards.

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### Additional Considerations

| Consideration                   | Details                                                                                                                            |
| ------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
| Integration with Other Features | Corner curvature works well with border and background customization, allowing for a cohesive overall panel design.                |
| Responsiveness                  | Consider adjusting corner radii dynamically based on panel size or window state for better responsiveness on varying screen sizes. |
| Future Enhancements             | Potential future enhancements could include animations for corner transitions or integration with theme-based styling.             |

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This comprehensive documentation for Corner Curvature Customization provides developers with the necessary insights and practical examples to effectively modify and integrate panel corner styling into their applications.
