dai-shi · dai-shi · Sep 2, 2024 · Aug 9, 2024 · Aug 9, 2024 · Aug 13, 2024
diff --git a/public/index.html b/public/index.html
@@ -25,6 +25,30 @@
       Learn how to configure a non-root public URL by running `npm run build`.
     -->
     <title>Excalidraw Animate</title>
+    <!-- Links for Lilita One font. Remove these links once Excalidraw is updated to the next version (v0.17.6 as of now) -->
+      <link rel="preconnect" href="https://fonts.googleapis.com">
+      <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+      <link href="https://fonts.googleapis.com/css2?family=Lilita+One&display=swap" rel="stylesheet">
+    <style>
+      /* Styles for additional fonts that are not part of Excalidraw package in the current version.
+       Remove them all once Excalidraw is updated (v0.17.6 as of now) */
+      @font-face {
+        font-family: 'Excalifont'; 
+        src: url('https://excalidraw.nyc3.cdn.digitaloceanspaces.com/fonts/oss/Excalifont-Regular-C9eKQy_N.woff2'); 
+      }
+      @font-face {
+        font-family: 'Comic Shanns'; 
+        src: url('https://excalidraw.nyc3.cdn.digitaloceanspaces.com/fonts/oss/ComicShanns-Regular-D0c8wzsC.woff2'); 
+      }
+      @font-face {
+        font-family: 'Nunito'; 
+        src: url('https://fonts.gstatic.com/s/nunito/v26/XRXI3I6Li01BKofiOc5wtlZ2di8HDIkhdTQ3j6zbXWjgeg.woff2'); 
+      }
+      @font-face {
+        font-family: 'Lilita One'; 
+        src: url('https://fonts.googleapis.com/css2?family=Lilita+One&display=swap'); 
+      }
+    </style>
   </head>
   <body>
     <noscript>You need to enable JavaScript to run this app.</noscript>

diff --git a/src/animate.ts b/src/animate.ts
@@ -290,20 +290,22 @@ const animateText = (
   pathForTextIndex += 1;
   const path = svg.ownerDocument.createElementNS(SVG_NS, "path");
   path.setAttribute("id", "pathForText" + pathForTextIndex);
+
+  const textPath = svg.ownerDocument.createTextNode(ele.textContent ?? "");
+  ele.textContent = " "; // HACK for Firebox as `null` does not work
+  ele.appendChild(textPath);
+  ele.setAttribute("opacity", "0.0");
+
   const animate = svg.ownerDocument.createElementNS(SVG_NS, "animate");
-  animate.setAttribute("attributeName", "d");
-  animate.setAttribute("from", `m${x} ${y} h0`);
-  animate.setAttribute("to", `m${x} ${y} h${width}`);
+  animate.setAttribute("attributeName", "opacity");
+  animate.setAttribute("from", `0.0`);
+  animate.setAttribute("to", `1.0`);
   animate.setAttribute("begin", `${currentMs}ms`);
   animate.setAttribute("dur", `${durationMs}ms`);
   animate.setAttribute("fill", "freeze");
-  path.appendChild(animate);
-  const textPath = svg.ownerDocument.createElementNS(SVG_NS, "textPath");
-  textPath.setAttribute("href", "#pathForText" + pathForTextIndex);
-  textPath.textContent = ele.textContent;
-  ele.textContent = " "; // HACK for Firebox as `null` does not work
+  ele.appendChild(animate);
+
   findNode(svg, "defs")?.appendChild(path);
-  ele.appendChild(textPath);
   animatePointer(
     svg,
     ele,

diff --git a/src/useLoadSvg.ts b/src/useLoadSvg.ts
@@ -9,6 +9,7 @@ import {
 import type { BinaryFiles } from "@excalidraw/excalidraw/types/types";
 import type {
   ExcalidrawElement,
+  ExcalidrawTextElement,
   NonDeletedExcalidrawElement,
 } from "@excalidraw/excalidraw/types/element/types";
 
@@ -71,6 +72,11 @@ export const useLoadSvg = () => {
             appState: data.appState,
             exportPadding: 30,
           });
+
+          // This is a patch up function to apply new fonts that are not part of Excalidraw package
+          // Remove this function once Excalidraw package is updated (v0.17.6 as of now)
+          applyNewFontsToSvg(svg, elements);
+
           const result = animateSvg(svg, elements, options);
           console.log(svg);
           if (inSequence) {
@@ -122,3 +128,97 @@ export const useLoadSvg = () => {
 
   return { loading, loadedSvgList, loadDataList };
 };
+
+// Change below are to apply new fonts that are not part of current version of Excalidraw package
+// Remove them all below once Excalidraw is updated (v0.17.6 as of now)
+// ================================================
+const DEFAULT_FONT = "Segoe UI Emoji";
+/** Up to date version of font family. It's brought from the latest version of Excalidraw repo */
+export const FONT_FAMILY = {
+  Virgil: 1,
+  Helvetica: 2,
+  Cascadia: 3,
+  // leave 4 unused as it was historically used for Assistant (which we don't use anymore) or custom font (Obsidian)
+  Excalifont: 5,
+  Nunito: 6,
+  "Lilita One": 7,
+  "Comic Shanns": 8,
+  "Liberation Sans": 9,
+} as const;
+
+/**
+ * Recursively apply new fonts to all text elements in the given SVG.
+ * `exportToSvg()` is not compatible with new fonts due to a discrepancy between package and release excalidraw.
+ * This function patches up the fonts resulting in a default font family.
+ *
+ * issue link: https://github.com/dai-shi/excalidraw-animate/issues/55
+ *  */
+function applyNewFontsToSvg(svg: SVGSVGElement, elements: ExcalidrawElement[]) {
+  const textElements: ExcalidrawTextElement[] = elements.filter(
+    (element): element is ExcalidrawTextElement =>
+      element.type === "text" && !!element.fontFamily
+  ) as ExcalidrawTextElement[];
+
+  /** index to keep track of block of text elements */
+  let currentTextElementIndex = 0;
+
+  // Since text element is represented in a group in given svg
+  // apply font family based on the group that contains the text elements
+  svg.querySelectorAll("g").forEach((svgGroup) => {
+    // It indicates the group is not for text - thus skip it
+    if (svgGroup.hasAttribute("stroke-linecap")) return;
+
+    const fontFamily = textElements[currentTextElementIndex]?.fontFamily;
+    svgGroup.querySelectorAll("text").forEach((svgText) => {
+      convertFontFamily(svgText, fontFamily);
+    });
+
+    currentTextElementIndex += 1;
+  });
+}
+
+function convertFontFamily(
+  textElement: SVGTextElement,
+  fontFamilyNumber: number | undefined
+) {
+  switch (fontFamilyNumber) {
+    case FONT_FAMILY.Virgil:
+      textElement.setAttribute("font-family", `Virgil, ${DEFAULT_FONT}`);
+      break;
+
+    case FONT_FAMILY.Helvetica:
+      textElement.setAttribute("font-family", `Helvetica, ${DEFAULT_FONT}`);
+      break;
+
+    case FONT_FAMILY.Cascadia:
+      textElement.setAttribute("font-family", `Cascadia, ${DEFAULT_FONT}`);
+      break;
+
+    case FONT_FAMILY.Excalifont:
+      textElement.setAttribute("font-family", `Excalifont, ${DEFAULT_FONT}`);
+      break;
+
+    case FONT_FAMILY.Nunito:
+      textElement.setAttribute("font-family", `Nunito, ${DEFAULT_FONT}`);
+      break;
+
+    case FONT_FAMILY["Lilita One"]:
+      textElement.setAttribute("font-family", `Lilita One, ${DEFAULT_FONT}`);
+      break;
+
+    case FONT_FAMILY["Comic Shanns"]:
+      textElement.setAttribute("font-family", `Comic Shanns, ${DEFAULT_FONT}`);
+      break;
+
+    case FONT_FAMILY["Liberation Sans"]:
+      textElement.setAttribute(
+        "font-family",
+        `Liberation Sans, ${DEFAULT_FONT}`
+      );
+      break;
+
+    default:
+      textElement.setAttribute("font-family", DEFAULT_FONT);
+      break;
+  }
+}