Add flipx and flipy to the glyph schema

Author: Perlkonig

src/renderers/_base.ts

@@ -778,6 +778,15 @@ export abstract class RendererBase {
                         size = factor * cellsize;
                     }
 
+                    // flip if requested
+                    // (svg.js seems to be doing it opposite of what I expect)
+                    if (g.flipx !== undefined && g.flipx) {
+                        use.flip("y");
+                    }
+                    if (g.flipy !== undefined && g.flipy) {
+                        use.flip("x");
+                    }
+
                     // Shift if requested
                     if (g.nudge !== undefined) {
                         let dx = 0;

src/schemas/schema.d.ts

@@ -327,6 +327,14 @@ export interface Glyph {
    * Determines how the piece (usually a text element) is reorientated after rotation is done. 'vertical' means it will always be reorientated vertically. Otherwise, it rotates along with everything else.
    */
   orientation?: "vertical" | "fluid";
+  /**
+   * Flips the glyph across the x axis
+   */
+  flipx?: boolean;
+  /**
+   * Flips the glyph across the y axis
+   */
+  flipy?: boolean;
   /**
    * The number of units to nudge the glyph from centre.
    */

src/schemas/schema.json

@@ -311,6 +311,16 @@
                     "enum": ["vertical", "fluid"],
                     "default": "fluid"
                 },
+                "flipx": {
+                    "description": "Flips the glyph across the x axis",
+                    "type": "boolean",
+                    "default": false
+                },
+                "flipy": {
+                    "description": "Flips the glyph across the y axis",
+                    "type": "boolean",
+                    "default": false
+                },
                 "nudge" : {
                     "description": "The number of units to nudge the glyph from centre.",
                     "type": "object",