feat: set percentage for graph markers

Author: liz3

lib/index.mjs

@@ -504,10 +504,12 @@ export const graph = (
 
     ctx.strokeStyle = "rgba(50,50,50, 0.8)";
     for (const marker of markers) {
-      ctx.moveTo(lOffset, top_offset);
-      ctx.lineTo(lOffset, top_offset + work_height);
+      const text = Array.isArray(marker) ? marker[1] : marker;
+      const xOffset = Array.isArray(marker) ? (work_width * marker[0]) + padding : lOffset;
+      ctx.moveTo(xOffset, top_offset);
+      ctx.lineTo(xOffset, top_offset + work_height);
       ctx.stroke();
-      ctx.fillText(marker, lOffset, top_offset + work_height - 14);
+      ctx.fillText(text, xOffset, top_offset + work_height - 14);
       lOffset += marker_len;
     }
   }