Add fillrule param to zones

Author: qu1ck

DATAFORMAT.md

@@ -73,6 +73,8 @@ pcbdata = {
         // SVG path of the polygon given as 'd' attribute of svg spec.
         // If "svgpath" is present "polygons" is ignored.
         "svgpath": svgpath,
+        // optional fillrule flag, defaults to nonzero
+        "fillrule": "nonzero" | "evenodd",
         "polygons": [
           // Set of polylines same as in polygon drawing.
           [[point1x, point1y], [point2x, point2y], ...],

InteractiveHtmlBom/ecad/schema/genericjsonpcbdata_v1.schema

@@ -568,7 +568,14 @@
                 "polygons": {
                     "$ref": "#/definitions/Polygons"
                 },
-                "net": { "type": "string" }
+                "net": { "type": "string" },
+                "fillrule": {
+                    "type": "string",
+                    "enum": [
+                        "nonzero",
+                        "evenodd"
+                    ]
+                }
             },
             "anyOf": [
                 { "required": [ "svgpath" ] },

InteractiveHtmlBom/web/render.js

@@ -440,7 +440,7 @@ function drawZones(canvas, layer, color, highlight) {
       zone.path2d = getPolygonsPath(zone);
     }
     if (highlight && highlightedNet != zone.net) continue;
-    ctx.fill(zone.path2d);
+    ctx.fill(zone.path2d, zone.fillrule || "nonzero");
     if (zone.width > 0) {
       ctx.lineWidth = zone.width;
       ctx.stroke(zone.path2d);