chore(git): merge pr #165 from 146-pdf-scaling into staging

Reviewed-on: #165
Reviewed-by: eugene <eugene@nostrdev.com>

package-lock.json

@@ -1,13 +1,14 @@
 {
-  "name": "web",
+  "name": "sigit",
   "version": "0.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "web",
+      "name": "sigit",
       "version": "0.0.0",
       "hasInstallScript": true,
+      "license": "AGPL-3.0-or-later ",
       "dependencies": {
         "@emotion/react": "11.11.4",
         "@emotion/styled": "11.11.0",
@@ -40,6 +41,7 @@
         "react-dropzone": "^14.2.3",
         "react-redux": "9.1.0",
         "react-router-dom": "6.22.1",
+        "react-singleton-hook": "^4.0.1",
         "react-toastify": "10.0.4",
         "redux": "5.0.1",
         "tseep": "1.2.1"
@@ -5832,6 +5834,23 @@
         "react-dom": ">=16.8"
       }
     },
+    "node_modules/react-singleton-hook": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/react-singleton-hook/-/react-singleton-hook-4.0.1.tgz",
+      "integrity": "sha512-fWuk8VxcZPChrkQasDLM8pgd/7kyi+Cr/5FfCiD99FicjEru+JmtEZNnN4lJ8Z7KbqAST5CYPlpz6lmNsZFGNw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "18"
+      },
+      "peerDependenciesMeta": {
+        "react-dom": {
+          "optional": true
+        },
+        "react-native": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/react-toastify": {
       "version": "10.0.4",
       "resolved": "https://registry.npmjs.org/react-toastify/-/react-toastify-10.0.4.tgz",

package.json

@@ -51,6 +51,7 @@
     "react-dropzone": "^14.2.3",
     "react-redux": "9.1.0",
     "react-router-dom": "6.22.1",
+    "react-singleton-hook": "^4.0.1",
     "react-toastify": "10.0.4",
     "redux": "5.0.1",
     "tseep": "1.2.1"
@@ -82,4 +83,4 @@
     ],
     "*.{ts,tsx,js,jsx,html,css,sass,less,yml,md,graphql}": "npm run formatter:staged"
   }
-}
+}

src/App.scss

@@ -100,12 +100,10 @@ input {
   -webkit-user-select: none;
   user-select: none;
 
-  overflow: hidden; /* Ensure no overflow */
-
   > img {
     display: block;
-    max-width: 100%;
+    width: 100%;
-    max-height: 100%;
+    height: auto;
     object-fit: contain; /* Ensure the image fits within the container */
   }
 }
@@ -121,6 +119,17 @@ input {
   object-fit: contain; /* Ensure the image fits within the container */
 }
 
+// Consistent styling for every file mark
+// Reverts some of the design defaults for font
+.file-mark {
+  font-family: Arial;
+  font-size: 16px;
+  font-weight: normal;
+  color: black;
+  letter-spacing: normal;
+  border: 1px solid transparent;
+}
+
 [data-dev='true'] {
   .image-wrapper {
     // outline: 1px solid #ccc; /* Optional: for visual debugging */

src/components/DrawPDFFields/index.tsx

@@ -4,6 +4,8 @@ import {
   CircularProgress,
   FormControl,
   InputLabel,
+  ListItemIcon,
+  ListItemText,
   MenuItem,
   Select
 } from '@mui/material'
@@ -13,10 +15,13 @@ import * as PDFJS from 'pdfjs-dist'
 import { ProfileMetadata, User, UserRole } from '../../types'
 import { MouseState, PdfPage, DrawnField, DrawTool } from '../../types/drawing'
 import { truncate } from 'lodash'
-import { settleAllFullfilfedPromises, hexToNpub } from '../../utils'
+import { settleAllFullfilfedPromises, hexToNpub, npubToHex } from '../../utils'
 import { getSigitFile, SigitFile } from '../../utils/file'
 import { FileDivider } from '../FileDivider'
 import { ExtensionFileBox } from '../ExtensionFileBox'
+import { inPx } from '../../utils/pdf'
+import { useScale } from '../../hooks/useScale'
+import { AvatarIconButton } from '../UserAvatarIconButton'
 
 PDFJS.GlobalWorkerOptions.workerSrc = new URL(
   'pdfjs-dist/build/pdf.worker.min.mjs',
@@ -33,6 +38,7 @@ interface Props {
 
 export const DrawPDFFields = (props: Props) => {
   const { selectedFiles, selectedTool, onDrawFieldsChange, users } = props
+  const { to, from } = useScale()
 
   const [sigitFiles, setSigitFiles] = useState<SigitFile[]>([])
   const [parsingPdf, setIsParsing] = useState<boolean>(false)
@@ -105,8 +111,8 @@ export const DrawPDFFields = (props: Props) => {
     const { mouseX, mouseY } = getMouseCoordinates(event)
 
     const newField: DrawnField = {
-      left: mouseX,
+      left: to(page.width, mouseX),
-      top: mouseY,
+      top: to(page.width, mouseY),
       width: 0,
       height: 0,
       counterpart: '',
@@ -160,8 +166,8 @@ export const DrawPDFFields = (props: Props) => {
 
       const { mouseX, mouseY } = getMouseCoordinates(event)
 
-      const width = mouseX - lastDrawnField.left
+      const width = to(page.width, mouseX) - lastDrawnField.left
-      const height = mouseY - lastDrawnField.top
+      const height = to(page.width, mouseY) - lastDrawnField.top
 
       lastDrawnField.width = width
       lastDrawnField.height = height
@@ -209,7 +215,8 @@ export const DrawPDFFields = (props: Props) => {
    */
   const onDrawnFieldMouseMove = (
     event: React.MouseEvent<HTMLDivElement>,
-    drawnField: DrawnField
+    drawnField: DrawnField,
+    pageWidth: number
   ) => {
     if (mouseState.dragging) {
       const { mouseX, mouseY, rect } = getMouseCoordinates(
@@ -219,11 +226,11 @@ export const DrawPDFFields = (props: Props) => {
       const coordsOffset = mouseState.coordsInWrapper
 
       if (coordsOffset) {
-        let left = mouseX - coordsOffset.mouseX
+        let left = to(pageWidth, mouseX - coordsOffset.mouseX)
-        let top = mouseY - coordsOffset.mouseY
+        let top = to(pageWidth, mouseY - coordsOffset.mouseY)
 
-        const rightLimit = rect.width - drawnField.width - 3
+        const rightLimit = to(pageWidth, rect.width) - drawnField.width - 3
-        const bottomLimit = rect.height - drawnField.height - 3
+        const bottomLimit = to(pageWidth, rect.height) - drawnField.height - 3
 
         if (left < 0) left = 0
         if (top < 0) top = 0
@@ -263,7 +270,8 @@ export const DrawPDFFields = (props: Props) => {
    */
   const onResizeHandleMouseMove = (
     event: React.MouseEvent<HTMLSpanElement>,
-    drawnField: DrawnField
+    drawnField: DrawnField,
+    pageWidth: number
   ) => {
     if (mouseState.resizing) {
       const { mouseX, mouseY } = getMouseCoordinates(
@@ -274,8 +282,8 @@ export const DrawPDFFields = (props: Props) => {
         event.currentTarget.parentElement?.parentElement
       )
 
-      const width = mouseX - drawnField.left
+      const width = to(pageWidth, mouseX) - drawnField.left
-      const height = mouseY - drawnField.top
+      const height = to(pageWidth, mouseY) - drawnField.top
 
       drawnField.width = width
       drawnField.height = height
@@ -372,21 +380,21 @@ export const DrawPDFFields = (props: Props) => {
                     key={drawnFieldIndex}
                     onMouseDown={onDrawnFieldMouseDown}
                     onMouseMove={(event) => {
-                      onDrawnFieldMouseMove(event, drawnField)
+                      onDrawnFieldMouseMove(event, drawnField, page.width)
                     }}
                     className={styles.drawingRectangle}
                     style={{
-                      left: `${drawnField.left}px`,
+                      left: inPx(from(page.width, drawnField.left)),
-                      top: `${drawnField.top}px`,
+                      top: inPx(from(page.width, drawnField.top)),
-                      width: `${drawnField.width}px`,
+                      width: inPx(from(page.width, drawnField.width)),
-                      height: `${drawnField.height}px`,
+                      height: inPx(from(page.width, drawnField.height)),
                       pointerEvents: mouseState.clicked ? 'none' : 'all'
                     }}
                   >
                     <span
                       onMouseDown={onResizeHandleMouseDown}
                       onMouseMove={(event) => {
-                        onResizeHandleMouseMove(event, drawnField)
+                        onResizeHandleMouseMove(event, drawnField, page.width)
                       }}
                       className={styles.resizeHandle}
                     ></span>
@@ -420,6 +428,7 @@ export const DrawPDFFields = (props: Props) => {
                           sx={{
                             background: 'white'
                           }}
+                          renderValue={(value) => renderCounterpartValue(value)}
                         >
                           {users
                             .filter((u) => u.role === UserRole.signer)
@@ -448,7 +457,22 @@ export const DrawPDFFields = (props: Props) => {
                                   key={index}
                                   value={hexToNpub(user.pubkey)}
                                 >
-                                  {displayValue}
+                                  <ListItemIcon>
+                                    <AvatarIconButton
+                                      src={metadata?.picture}
+                                      hexKey={user.pubkey}
+                                      aria-label={`account of user ${displayValue}`}
+                                      color="inherit"
+                                      sx={{
+                                        padding: 0,
+                                        '> img': {
+                                          width: '30px',
+                                          height: '30px'
+                                        }
+                                      }}
+                                    />
+                                  </ListItemIcon>
+                                  <ListItemText>{displayValue}</ListItemText>
                                 </MenuItem>
                               )
                             })}
@@ -465,6 +489,45 @@ export const DrawPDFFields = (props: Props) => {
     )
   }
 
+  const renderCounterpartValue = (value: string) => {
+    const user = users.find((u) => u.pubkey === npubToHex(value))
+    if (user) {
+      let displayValue = truncate(value, {
+        length: 16
+      })
+
+      const metadata = props.metadata[user.pubkey]
+
+      if (metadata) {
+        displayValue = truncate(
+          metadata.name || metadata.display_name || metadata.username || value,
+          {
+            length: 16
+          }
+        )
+      }
+      return (
+        <>
+          <AvatarIconButton
+            src={props.metadata[user.pubkey]?.picture}
+            hexKey={npubToHex(user.pubkey) || undefined}
+            sx={{
+              padding: 0,
+              marginRight: '6px',
+              '> img': {
+                width: '21px',
+                height: '21px'
+              }
+            }}
+          />
+          {displayValue}
+        </>
+      )
+    }
+
+    return value
+  }
+
   if (parsingPdf) {
     return (
       <Box sx={{ width: '100%', textAlign: 'center' }}>

src/components/DrawPDFFields/style.module.scss

@@ -73,7 +73,7 @@
     justify-content: center;
     align-items: center;
     bottom: -60px;
-    min-width: 170px;
+    min-width: 193px;
     min-height: 30px;
     padding: 5px 0;
   }

src/components/PDFView/PdfMarkItem.tsx

@@ -1,12 +1,14 @@
 import { CurrentUserMark } from '../../types/mark.ts'
 import styles from '../DrawPDFFields/style.module.scss'
-import { inPx } from '../../utils/pdf.ts'
+import { FONT_SIZE, FONT_TYPE, inPx } from '../../utils/pdf.ts'
+import { useScale } from '../../hooks/useScale.tsx'
 
 interface PdfMarkItemProps {
   userMark: CurrentUserMark
   handleMarkClick: (id: number) => void
   selectedMarkValue: string
   selectedMark: CurrentUserMark | null
+  pageWidth: number
 }
 
 /**
@@ -16,22 +18,26 @@ const PdfMarkItem = ({
   selectedMark,
   handleMarkClick,
   selectedMarkValue,
-  userMark
+  userMark,
+  pageWidth
 }: PdfMarkItemProps) => {
   const { location } = userMark.mark
   const handleClick = () => handleMarkClick(userMark.mark.id)
   const isEdited = () => selectedMark?.mark.id === userMark.mark.id
   const getMarkValue = () =>
     isEdited() ? selectedMarkValue : userMark.currentValue
+  const { from } = useScale()
   return (
     <div
       onClick={handleClick}
-      className={`${styles.drawingRectangle} ${isEdited() && styles.edited}`}
+      className={`file-mark ${styles.drawingRectangle} ${isEdited() && styles.edited}`}
       style={{
-        left: inPx(location.left),
+        left: inPx(from(pageWidth, location.left)),
-        top: inPx(location.top),
+        top: inPx(from(pageWidth, location.top)),
-        width: inPx(location.width),
+        width: inPx(from(pageWidth, location.width)),
-        height: inPx(location.height)
+        height: inPx(from(pageWidth, location.height)),
+        fontFamily: FONT_TYPE,
+        fontSize: inPx(from(pageWidth, FONT_SIZE))
       }}
     >
       {getMarkValue()}

src/components/PDFView/PdfPageItem.tsx

@@ -4,7 +4,8 @@ import { CurrentUserMark, Mark } from '../../types/mark.ts'
 import PdfMarkItem from './PdfMarkItem.tsx'
 import { useEffect, useRef } from 'react'
 import pdfViewStyles from './style.module.scss'
-import { inPx } from '../../utils/pdf.ts'
+import { FONT_SIZE, FONT_TYPE, inPx } from '../../utils/pdf.ts'
+import { useScale } from '../../hooks/useScale.tsx'
 interface PdfPageProps {
   currentUserMarks: CurrentUserMark[]
   handleMarkClick: (id: number) => void
@@ -33,6 +34,8 @@ const PdfPageItem = ({
     }
   }, [selectedMark])
   const markRefs = useRef<(HTMLDivElement | null)[]>([])
+  const { from } = useScale()
+
   return (
     <div className={`image-wrapper ${styles.pdfImageWrapper}`}>
       <img draggable="false" src={page.image} />
@@ -44,23 +47,28 @@ const PdfPageItem = ({
             selectedMarkValue={selectedMarkValue}
             userMark={m}
             selectedMark={selectedMark}
+            pageWidth={page.width}
           />
         </div>
       ))}
-      {otherUserMarks.map((m, i) => (
+      {otherUserMarks.map((m, i) => {
-        <div
+        return (
-          key={i}
+          <div
-          className={pdfViewStyles.otherUserMarksDisplay}
+            key={i}
-          style={{
+            className={pdfViewStyles.otherUserMarksDisplay}
-            left: inPx(m.location.left),
+            style={{
-            top: inPx(m.location.top),
+              left: inPx(from(page.width, m.location.left)),
-            width: inPx(m.location.width),
+              top: inPx(from(page.width, m.location.top)),
-            height: inPx(m.location.height)
+              width: inPx(from(page.width, m.location.width)),
-          }}
+              height: inPx(from(page.width, m.location.height)),
-        >
+              fontFamily: FONT_TYPE,
-          {m.value}
+              fontSize: inPx(from(page.width, FONT_SIZE))
-        </div>
+            }}
-      ))}
+          >
+            {m.value}
+          </div>
+        )
+      })}
     </div>
   )
 }

src/hooks/useScale.tsx

@@ -0,0 +1,46 @@
+import { useEffect, useState } from 'react'
+import { singletonHook } from 'react-singleton-hook'
+import { getInnerContentWidth } from '../utils/pdf'
+
+const noScaleInit = {
+  to: (_: number, v: number) => v,
+  from: (_: number, v: number) => v
+}
+
+const useScaleImpl = () => {
+  const [width, setWidth] = useState(getInnerContentWidth())
+
+  // Get the scale based on the original width
+  const scale = (originalWidth: number) => {
+    return width / originalWidth
+  }
+
+  // Get the original pixel value
+  const to = (originalWidth: number, value: number) => {
+    return value / scale(originalWidth)
+  }
+
+  // Get the scaled pixel value
+  const from = (originalWidth: number, value: number) => {
+    return value * scale(originalWidth)
+  }
+
+  const resize = () => {
+    setWidth(getInnerContentWidth())
+  }
+
+  useEffect(() => {
+    resize()
+
+    window.addEventListener('resize', resize)
+    return () => {
+      window.removeEventListener('resize', resize)
+    }
+  }, [])
+
+  return { to, from }
+}
+
+export const useScale = singletonHook(noScaleInit, useScaleImpl, {
+  unmountIfNoConsumers: true
+})

src/layouts/StickySideColumns.module.scss

@@ -29,8 +29,4 @@
   padding: 10px;
   border: 10px solid $overlay-background-color;
   border-radius: 4px;
-
-  max-width: 590px;
-  width: 590px;
-  margin: 0 auto;
 }

src/layouts/StickySideColumns.tsx

@@ -17,7 +17,9 @@ export const StickySideColumns = ({
       <div className={`${styles.sidesWrap} ${styles.files}`}>
         <div className={styles.sides}>{left}</div>
       </div>
-      <div className={styles.content}>{children}</div>
+      <div id="content-preview" className={styles.content}>
+        {children}
+      </div>
       <div className={styles.sidesWrap}>
         <div className={styles.sides}>{right}</div>
       </div>

src/pages/verify/index.tsx

@@ -29,6 +29,8 @@ import axios from 'axios'
 import {
   addMarks,
   convertToPdfBlob,
+  FONT_SIZE,
+  FONT_TYPE,
   groupMarksByFileNamePage,
   inPx
 } from '../../utils/pdf.ts'
@@ -50,6 +52,7 @@ import React from 'react'
 import { convertToSigitFile, SigitFile } from '../../utils/file.ts'
 import { FileDivider } from '../../components/FileDivider.tsx'
 import { ExtensionFileBox } from '../../components/ExtensionFileBox.tsx'
+import { useScale } from '../../hooks/useScale.tsx'
 
 interface PdfViewProps {
   files: CurrentUserFile[]
@@ -65,6 +68,7 @@ const SlimPdfView = ({
   parsedSignatureEvents
 }: PdfViewProps) => {
   const pdfRefs = useRef<(HTMLDivElement | null)[]>([])
+  const { from } = useScale()
   useEffect(() => {
     if (currentFile !== null && !!pdfRefs.current[currentFile.id]) {
       pdfRefs.current[currentFile.id]?.scrollIntoView({
@@ -105,13 +109,15 @@ const SlimPdfView = ({
                       {marks.map((m) => {
                         return (
                           <div
-                            className={styles.mark}
+                            className={`file-mark ${styles.mark}`}
                             key={m.id}
                             style={{
-                              left: inPx(m.location.left),
+                              left: inPx(from(page.width, m.location.left)),
-                              top: inPx(m.location.top),
+                              top: inPx(from(page.width, m.location.top)),
-                              width: inPx(m.location.width),
+                              width: inPx(from(page.width, m.location.width)),
-                              height: inPx(m.location.height)
+                              height: inPx(from(page.width, m.location.height)),
+                              fontFamily: FONT_TYPE,
+                              fontSize: inPx(from(page.width, FONT_SIZE))
                             }}
                           >
                             {m.value}

src/types/drawing.ts

@@ -1,3 +1,5 @@
+import { MarkRect } from './mark'
+
 export interface MouseState {
   clicked?: boolean
   dragging?: boolean
@@ -10,14 +12,11 @@ export interface MouseState {
 
 export interface PdfPage {
   image: string
+  width: number
   drawnFields: DrawnField[]
 }
 
-export interface DrawnField {
+export interface DrawnField extends MarkRect {
-  left: number
-  top: number
-  width: number
-  height: number
   type: MarkType
   /**
    * npub of a counter part

src/types/mark.ts

@@ -18,10 +18,13 @@ export interface Mark {
   value?: string
 }
 
-export interface MarkLocation {
+export interface MarkLocation extends MarkRect {
-  top: number
-  left: number
-  height: number
-  width: number
   page: number
 }
+
+export interface MarkRect {
+  left: number
+  top: number
+  width: number
+  height: number
+}

src/utils/file.ts

@@ -74,6 +74,7 @@ export const getSigitFile = async (file: File) => {
   const sigitFile = new SigitFile(file)
   // Process sigit file
   // - generate pages for PDF files
+  // - generate ObjectRL for image files
   await sigitFile.process()
   return sigitFile
 }

src/utils/pdf.ts

@@ -8,11 +8,6 @@ PDFJS.GlobalWorkerOptions.workerSrc = new URL(
   import.meta.url
 ).toString()
 
-/**
- * Scale between the PDF page's natural size and rendered size
- * @constant {number}
- */
-export const SCALE: number = 3
 /**
  * Defined font size used when generating a PDF. Currently it is difficult to fully
  * correlate font size used at the time of filling in / drawing on the PDF
@@ -20,14 +15,14 @@ export const SCALE: number = 3
  * This should be fixed going forward.
  * Switching to PDF-Lib will most likely make this problem redundant.
  */
-export const FONT_SIZE: number = 40
+export const FONT_SIZE: number = 16
 /**
  * Current font type used when generating a PDF.
  */
 export const FONT_TYPE: string = 'Arial'
 
 /**
- * A utility that transforms a drawing coordinate number into a CSS-compatible string
+ * A utility that transforms a drawing coordinate number into a CSS-compatible pixel string
  * @param coordinate
  */
 export const inPx = (coordinate: number): string => `${coordinate}px`
@@ -65,6 +60,24 @@ export const readPdf = (file: File): Promise<string | ArrayBuffer> => {
   })
 }
 
+export const getInnerContentWidth = () => {
+  // Fetch the first container element we find
+  const element = document.querySelector('#content-preview')
+
+  if (element) {
+    const style = getComputedStyle(element)
+
+    // Calculate width without padding
+    const widthWithoutPadding =
+      element.clientWidth - parseFloat(style.padding) * 2
+
+    return widthWithoutPadding
+  }
+
+  // Default value
+  return 620
+}
+
 /**
  * Converts pdf to the images
  * @param data pdf file bytes
@@ -72,28 +85,30 @@ export const readPdf = (file: File): Promise<string | ArrayBuffer> => {
 export const pdfToImages = async (
   data: string | ArrayBuffer
 ): Promise<PdfPage[]> => {
-  const images: string[] = []
+  const pages: PdfPage[] = []
   const pdf = await PDFJS.getDocument(data).promise
   const canvas = document.createElement('canvas')
+  const width = getInnerContentWidth()
 
   for (let i = 0; i < pdf.numPages; i++) {
     const page = await pdf.getPage(i + 1)
-    const viewport = page.getViewport({ scale: SCALE })
+
+    const originalViewport = page.getViewport({ scale: 1 })
+    const scale = width / originalViewport.width
+    const viewport = page.getViewport({ scale: scale })
     const context = canvas.getContext('2d')
     canvas.height = viewport.height
     canvas.width = viewport.width
+
     await page.render({ canvasContext: context!, viewport: viewport }).promise
-    images.push(canvas.toDataURL())
+    pages.push({
+      image: canvas.toDataURL(),
+      width: originalViewport.width,
+      drawnFields: []
+    })
   }
 
-  return Promise.resolve(
+  return pages
-    images.map((image) => {
-      return {
-        image,
-        drawnFields: []
-      }
-    })
-  )
 }
 
 /**
@@ -113,34 +128,39 @@ export const addMarks = async (
 
   for (let i = 0; i < pdf.numPages; i++) {
     const page = await pdf.getPage(i + 1)
-    const viewport = page.getViewport({ scale: SCALE })
+    const viewport = page.getViewport({ scale: 1 })
     const context = canvas.getContext('2d')
     canvas.height = viewport.height
     canvas.width = viewport.width
-    await page.render({ canvasContext: context!, viewport: viewport }).promise
+    if (context) {
+      await page.render({ canvasContext: context, viewport: viewport }).promise
 
-    if (marksPerPage && Object.hasOwn(marksPerPage, i))
+      if (marksPerPage && Object.hasOwn(marksPerPage, i)) {
-      marksPerPage[i]?.forEach((mark) => draw(mark, context!))
+        marksPerPage[i]?.forEach((mark) => draw(mark, context))
+      }
 
-    images.push(canvas.toDataURL())
+      images.push(canvas.toDataURL())
+    }
   }
 
-  return Promise.resolve(images)
+  canvas.remove()
+
+  return images
 }
 
 /**
  * Utility to scale mark in line with the PDF-to-PNG scale
  */
-export const scaleMark = (mark: Mark): Mark => {
+export const scaleMark = (mark: Mark, scale: number): Mark => {
   const { location } = mark
   return {
     ...mark,
     location: {
       ...location,
-      width: location.width * SCALE,
+      width: location.width * scale,
-      height: location.height * SCALE,
+      height: location.height * scale,
-      left: location.left * SCALE,
+      left: location.left * scale,
-      top: location.top * SCALE
+      top: location.top * scale
     }
   }
 }
@@ -158,13 +178,14 @@ export const hasValue = (mark: Mark): boolean => !!mark.value
  */
 export const draw = (mark: Mark, ctx: CanvasRenderingContext2D) => {
   const { location } = mark
-
+  ctx.font = FONT_SIZE + 'px ' + FONT_TYPE
-  ctx!.font = FONT_SIZE + 'px ' + FONT_TYPE
+  ctx.fillStyle = 'black'
-  ctx!.fillStyle = 'black'
+  const textMetrics = ctx.measureText(mark.value!)
-  const textMetrics = ctx!.measureText(mark.value!)
+  const textHeight =
+    textMetrics.actualBoundingBoxAscent + textMetrics.actualBoundingBoxDescent
   const textX = location.left + (location.width - textMetrics.width) / 2
-  const textY = location.top + (location.height + parseInt(ctx!.font)) / 2
+  const textY = location.top + (location.height + textHeight) / 2
-  ctx!.fillText(mark.value!, textX, textY)
+  ctx.fillText(mark.value!, textX, textY)
 }
 
 /**
@@ -194,13 +215,11 @@ export const convertToPdfBlob = async (
 /**
  * @param marks - an array of Marks
  * @function hasValue removes any Mark without a property
- * @function scaleMark scales remaining marks in line with SCALE
  * @function byPage groups remaining Marks by their page marks.location.page
  */
 export const groupMarksByFileNamePage = (marks: Mark[]) => {
   return marks
     .filter(hasValue)
-    .map(scaleMark)
     .reduce<{ [fileName: string]: { [page: number]: Mark[] } }>(byPage, {})
 }