SpiroNet

The .NET C# port of libspiro - conversion between spiro control points and bezier's

Introduction

For libspiro introduction please see libspiro project page and drawing with spiro. There is also GUI version using libspiro written in C#/WPF for Windows.

NuGet

SpiroNet is delivered as a NuGet package.

You can find the packages here NuGet or by using nightly build feed:

• Add https://www.myget.org/F/spironet-nightly/api/v2 to your package sources
• Alternative nightly build feed https://pkgs.dev.azure.com/wieslawsoltes/GitHub/_packaging/CI/nuget/v3/index.json
• Update your package using SpiroNet feed

You can install the package like this:

Install-Package SpiroNet -Pre

Available Packages

• SpiroNet - Core libspiro library.
• SpiroNet.Editor - Core spiro shape editor.
• SpiroNet.Json - Json support for spiro shape editor.
• SpiroNet.ViewModels - View models for spiro shape editor controls.
• SpiroNet.Editor.Avalonia - Avalonia editor view for spiro shape editor.

Package Dependencies

• Newtonsoft.Json
• Avalonia

Dependencies are required only for specific editor packages.

Package Sources

• https://api.nuget.org/v3/index.json

Resources

• GitHub source code repository.

Usage

Provided examples create geometric paths as output using Path Markup Syntax for WPF/Silverlight and Path Data for SVG.

var points = new SpiroControlPoint[4];
points[0].X = -100; points[0].Y = 0; points[0].Type = SpiroPointType.G4;
points[1].X = 0; points[1].Y = 100; points[1].Type = SpiroPointType.G4;
points[2].X = 100; points[2].Y = 0; points[2].Type = SpiroPointType.G4;
points[3].X = 0; points[3].Y = -100; points[3].Type = SpiroPointType.G4;

var bc = new PathBezierContext();
var success = Spiro.SpiroCPsToBezier0(points, 4, true, bc);

Console.WriteLine(bc);
Console.WriteLine("Success: {0} ", success);

var points = new SpiroControlPoint[5];
points[0].X = -100; points[0].Y = 0; points[0].Type = SpiroPointType.G4;
points[1].X = 0; points[1].Y = 100; points[1].Type = SpiroPointType.G4;
points[2].X = 100; points[2].Y = 0; points[2].Type = SpiroPointType.G4;
points[3].X = 0; points[3].Y = -100; points[3].Type = SpiroPointType.G4;
points[4].X = 0; points[4].Y = 0; points[4].Type = SpiroPointType.End;

var bc = new PathBezierContext();
var success = Spiro.TaggedSpiroCPsToBezier0(points, bc);

Console.WriteLine(bc);
Console.WriteLine("Success: {0} ", success);

var points = new SpiroControlPoint[4];
points[0].X = -100; points[0].Y = 0; points[0].Type = SpiroPointType.OpenContour;
points[1].X = 0; points[1].Y = 100; points[1].Type = SpiroPointType.G4;
points[2].X = 100; points[2].Y = 0; points[2].Type = SpiroPointType.G4;
points[3].X = 0; points[3].Y = -100; points[3].Type = SpiroPointType.EndOpenContour;

var bc = new PathBezierContext();
var success = Spiro.TaggedSpiroCPsToBezier0(points, bc);

Console.WriteLine(bc);
Console.WriteLine("Success: {0} ", success);

License

SpiroNet is licensed under the GPL-3.0 license.

Original license and patent grant is included in README by Raph Levien for ppedit.