feat: highlight

[UziTech]

Add new options for highlighting strokes

new options:

• highlightColor: default to blank to remove highlight
• highlightSize: default to 1 to have 1 pixel of highlight on each side of the stroke

fixes #726

TODO:

• update docs
• figure out a way to do this without needing to draw entire stroke on every update

[849599470]

You may need to add a CSS property to the canvas:

filter: drop-shadow(0px 0px 2px #fff);

[UziTech]

Thanks for the suggestion but that just applies the drop-shadow to the canvas element not the drawing on the canvas.

[849599470]

Thanks for the suggestion but that just applies the drop-shadow to the canvas element not the drawing on the canvas.

When initializing Signature, set the background color to transparent.

new Signature(canvasDom, {
    // other options
    backgroundColor: "rgba(0,0,0,0)",
})