src/components/MarkInputs/Signature.module.scss

@@ -0,0 +1,44 @@
+@import '../../styles/colors.scss';
+
+$padding: 5px;
+
+.wrapper {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  padding: $padding;
+}
+
+.relative {
+  position: relative;
+}
+
+.canvas {
+  outline: 1px solid black;
+  background-color: $body-background-color;
+  cursor: crosshair;
+
+  // Disable panning/zooming when touching canvas element
+  -ms-touch-action: none;
+  touch-action: none;
+  -webkit-user-select: none;
+  user-select: none;
+}
+
+.absolute {
+  position: absolute;
+  inset: 0;
+  pointer-events: none;
+}
+
+.reset {
+  cursor: pointer;
+  position: absolute;
+  top: 0;
+  right: $padding;
+  color: $primary-main;
+
+  &:hover {
+    color: $primary-dark;
+  }
+}

src/components/MarkInputs/Signature.tsx

@@ -0,0 +1,101 @@
+import { useRef, useState } from 'react'
+import { MarkInputProps } from '../../types/mark'
+import { getOptimizedPaths, optimizeSVG } from '../../utils'
+import { faEraser } from '@fortawesome/free-solid-svg-icons'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import styles from './Signature.module.scss'
+import { MarkRenderSignature } from '../MarkRender/Signature'
+
+export const MarkInputSignature = ({
+  value,
+  handler,
+  userMark
+}: MarkInputProps) => {
+  const location = userMark?.mark.location
+
+  const canvasRef = useRef<HTMLCanvasElement>(null)
+  const [drawing, setDrawing] = useState(false)
+  const [paths, setPaths] = useState<string[]>(value ? JSON.parse(value) : [])
+
+  function update() {
+    if (location && paths) {
+      if (paths.length) {
+        const optimizedSvg = optimizeSVG(location, paths)
+        const extractedPaths = getOptimizedPaths(optimizedSvg)
+        handler(JSON.stringify(extractedPaths))
+      } else {
+        handler('')
+      }
+    }
+  }
+
+  const handlePointerDown = (event: React.PointerEvent) => {
+    const rect = event.currentTarget.getBoundingClientRect()
+    const x = event.clientX - rect.left
+    const y = event.clientY - rect.top
+
+    const ctx = canvasRef.current?.getContext('2d')
+    ctx?.beginPath()
+    ctx?.moveTo(x, y)
+    setPaths([...paths, `M ${x} ${y}`])
+    setDrawing(true)
+  }
+  const handlePointerUp = () => {
+    setDrawing(false)
+    update()
+    const ctx = canvasRef.current?.getContext('2d')
+    ctx?.clearRect(0, 0, canvasRef.current!.width, canvasRef.current!.height)
+  }
+  const handlePointerMove = (event: React.PointerEvent) => {
+    if (!drawing) return
+    const ctx = canvasRef.current?.getContext('2d')
+    const rect = canvasRef.current?.getBoundingClientRect()
+    const x = event.clientX - rect!.left
+    const y = event.clientY - rect!.top
+
+    ctx?.lineTo(x, y)
+    ctx?.stroke()
+
+    // Collect the path data
+    setPaths((prevPaths) => {
+      const newPaths = [...prevPaths]
+      newPaths[newPaths.length - 1] += ` L ${x} ${y}`
+      return newPaths
+    })
+  }
+
+  const handleReset = () => {
+    setPaths([])
+    setDrawing(false)
+    update()
+    const ctx = canvasRef.current?.getContext('2d')
+    ctx?.clearRect(0, 0, canvasRef.current!.width, canvasRef.current!.height)
+  }
+
+  return (
+    <>
+      <div className={styles.wrapper}>
+        <div className={styles.relative}>
+          <canvas
+            height={location?.height}
+            width={location?.width}
+            ref={canvasRef}
+            className={styles.canvas}
+            onPointerDown={handlePointerDown}
+            onPointerUp={handlePointerUp}
+            onPointerMove={handlePointerMove}
+            onPointerOut={handlePointerUp}
+          ></canvas>
+          {typeof userMark?.mark !== 'undefined' && (
+            <div className={styles.absolute}>
+              <MarkRenderSignature value={value} mark={userMark.mark} />
+            </div>
+          )}
+          <div className={styles.reset}>
+            <FontAwesomeIcon size="sm" icon={faEraser} onClick={handleReset} />
+          </div>
+        </div>
+      </div>
+    </>
+  )
+}

src/components/MarkRender/Signature.tsx

@@ -0,0 +1,13 @@
+import { MarkRenderProps } from '../../types/mark'
+
+export const MarkRenderSignature = ({ value, mark }: MarkRenderProps) => {
+  const paths = value ? JSON.parse(value) : []
+
+  return (
+    <svg viewBox={`0 0 ${mark.location.width} ${mark.location.height}`}>
+      {paths.map((path: string) => (
+        <path d={path} stroke="black" fill="none" />
+      ))}
+    </svg>
+  )
+}

src/components/getMarkComponents.tsx

@@ -0,0 +1,16 @@
+import { MarkType } from '../types/drawing'
+import { MarkConfigs } from '../types/mark'
+import { MarkInputSignature } from './MarkInputs/Signature'
+import { MarkInputText } from './MarkInputs/Text'
+import { MarkRenderSignature } from './MarkRender/Signature'
+
+export const MARK_TYPE_CONFIG: MarkConfigs = {
+  [MarkType.TEXT]: {
+    input: MarkInputText,
+    render: ({ value }) => <>{value}</>
+  },
+  [MarkType.SIGNATURE]: {
+    input: MarkInputSignature,
+    render: MarkRenderSignature
+  }
+}

src/types/mark.ts

@@ -28,3 +28,24 @@ export interface MarkRect {
   width: number
   height: number
 }
+
+export interface MarkInputProps {
+  value: string
+  handler: (value: string) => void
+  placeholder?: string
+  userMark?: CurrentUserMark
+}
+
+export interface MarkRenderProps {
+  value?: string
+  mark: Mark
+}
+
+export interface MarkConfig {
+  input: React.FC<MarkInputProps>
+  render?: React.FC<MarkRenderProps>
+}
+
+export type MarkConfigs = {
+  [key in MarkType]?: MarkConfig
+}