A basic HTML SVG Editor written in Blazor.
The WASM sample project can be demoed at https://kristofferstrube.github.io/Blazor.SVGEditor/
You need to install .NET 7.0 or newer to use the library.
You can install the package via NuGet with the Package Manager in your IDE or alternatively using the command line:
dotnet add package KristofferStrube.Blazor.SVGEditorThe package can be used in Blazor WebAssembly and Blazor Server projects. In the samples folder of this repository, you can find two projects that show how to use the SVGEditor component in both Blazor Server and WASM.
You need to reference the package to use it in your pages. This can be done in _Import.razor by adding the following.
@using KristofferStrube.Blazor.SVGEditorTo use the component in your pages you also need to register som services in your service collection. We have made a single method that allows you to add the needed service which you use like so:
var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");
builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
// Adding the needed services.
builder.Services.AddSVGEditor();
await builder.Build().RunAsync();The libraries that the component uses also need to have some stylesheets and scripts added to function.
For this, you need to insert the following tags in the <head> section of your index.html or Host.cshtml file:
<link href="_content/BlazorColorPicker/colorpicker.css" rel="stylesheet" />
<link href="_content/Blazor.ContextMenu/blazorContextMenu.min.css" rel="stylesheet" />
<link href="_content/KristofferStrube.Blazor.SVGEditor/kristofferStrubeBlazorSVGEditor.css" rel="stylesheet" />The library uses Scoped CSS, so you must include your project-specific .styles.css CSS file in your project for the scoped styles of the library components. An example is in the test project in this repo:
<link href="KristofferStrube.Blazor.SVGEditor.WasmExample.styles.css" rel="stylesheet" />At the end of the file, after you have referenced the Blazor Server or Wasm bootstrapper, insert the following:
<script src="_content/Blazor.ContextMenu/blazorContextMenu.min.js"></script>Now, you are ready to use the component in your page. A minimal example of this would be the following:
<div style="height:80vh">
<SVGEditor Input=@Input InputUpdated="(string s) => { Input = s; StateHasChanged(); }" />
</div>
@code {
private string Input = @"<rect x=""0"" y=""0"" height=""200"" width=""200"" fill=""green"" stroke=""blue"" stroke-width=""2""></rect>";
}- RECT (x, y, width, height, fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- CIRCLE (cx, cy, r, fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- ELLIPSE (cx, cy, rx, ry, fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- POLYGON (points, fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- POLYLINE (points, fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- LINE (x1, y1, x2, y2, fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- TEXT (x, y, style:(font-size,font-weight,font-family), fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- PATH (d, fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- Movements
- Lines
- Vertical Lines
- Horizontal Lines
- Close Path
- Cubic Bézier Curve
- Shorthand aswell
- Quadratic Bézier Curve
- Shorthand aswell
- Elliptical Arc Curve
- Needs more work for radi interaction
- G (fill, stroke, stroke-width, stroke-linecap, stroke-linejoin, stroke-offset)
- Missing scaling of children
- ANIMATE
- Support for showing all Animate tags when Playing
- Support for editing Fill animation values
- Support for editing Stroke animation values
- Support for editing Stroke Offset values
- LINEARGRADIENT (x1, x2, y1, y2, and stops)
- Add support for touch devices
- Support errors better to recover instead of crashing when parsing malformed SVGs.
Feel free to open issues on the repository if you find any errors with the package or have wishes for features.
graph LR;
subgraph Shapes
Circle
Ellipse
Line
Text
Path
Polygon
Polyline
Rect
G
end
subgraph Path Instructions
ClosePathInstruction
CubicBézierCurveInstruction
EllipticalArcInstruction
HorizontalLineInstruction
LineInstruction
MoveInstruction
QuadraticBézierCurveInstruction
ShorthandCubicBézierCurveInstruction
ShorthandQuadraticBézierCurveInstruction
VerticalLineInstruction
end
ISVGElement[[ISVGElement]]
Shape[[Shape]]
BasePathInstruction[[BasePathInstruction]]
BaseControlPointPathInstruction[[BaseControlPointPathInstruction]]
IPathInstruction[[IPathInstruction]]
Shape-.->ISVGElement;
SVG------ISVGElement
G---ISVGElement;
Path-.->Shape;
Path-----IPathInstruction
G-.->Shape;
Circle-.->Shape;
Ellipse-.->Shape;
Line-.->Shape;
Text-.->Shape;
Polygon-.->Shape;
Polyline-.->Shape;
Rect-.->Shape;
ClosePathInstruction-->BasePathInstruction
CubicBézierCurveInstruction-->BaseControlPointPathInstruction
EllipticalArcInstruction-->BasePathInstruction
HorizontalLineInstruction-->BasePathInstruction
LineInstruction-->BasePathInstruction
MoveInstruction-->BasePathInstruction
QuadraticBézierCurveInstruction-->BaseControlPointPathInstruction
ShorthandCubicBézierCurveInstruction-->BaseControlPointPathInstruction
ShorthandQuadraticBézierCurveInstruction-->BaseControlPointPathInstruction
VerticalLineInstruction-->BasePathInstruction
BaseControlPointPathInstruction-->BasePathInstruction
BasePathInstruction-->IPathInstruction