사각형 생성 모드 추가, redo, undo 추가

src/app/mode.js

@@ -5,6 +5,7 @@ export const MODE = {
   EDIT: 'edit',
   TEMPLATE: 'template',
   TEXTBOX: 'textbox',
+  DRAW_RECT: 'drawRect',
 }
 
 export function useMode() {
@@ -25,6 +26,9 @@ export function useMode() {
       case 'textbox':
         textboxMode(canvas)
         break
+      case 'drawRect':
+        drawRectMode(canvas)
+        break
     }
   }
 
@@ -194,5 +198,46 @@ export function useMode() {
     })
   }
 
+  const drawRectMode = (canvas) => {
+    let rect, isDown, origX, origY
+    canvas.on('mouse:down', function (o) {
+      isDown = true
+      const pointer = canvas.getPointer(o.e)
+      origX = pointer.x
+      origY = pointer.y
+      rect = new fabric.Rect({
+        left: origX,
+        top: origY,
+        originX: 'left',
+        originY: 'top',
+        width: pointer.x - origX,
+        height: pointer.y - origY,
+        angle: 0,
+        fill: 'rgba(255,0,0,0.5)',
+        transparentCorners: false,
+      })
+      canvas.add(rect)
+    })
+
+    canvas.on('mouse:move', function (o) {
+      if (!isDown) return
+      const pointer = canvas.getPointer(o.e)
+      if (origX > pointer.x) {
+        rect.set({ left: Math.abs(pointer.x) })
+      }
+      if (origY > pointer.y) {
+        rect.set({ top: Math.abs(pointer.y) })
+      }
+
+      rect.set({ width: Math.abs(origX - pointer.x) })
+      rect.set({ height: Math.abs(origY - pointer.y) })
+      canvas.renderAll()
+    })
+
+    canvas.on('mouse:up', function (o) {
+      isDown = false
+    })
+  }
+
   return { mode, changeMode }
 }

src/components/Roof2.jsx

@@ -3,7 +3,7 @@ import { useEffect } from 'react'
 import { MODE, useMode } from '@/app/mode'
 
 export default function Roof2() {
-  const { canvas } = useCanvas('canvas')
+  const { canvas, handleRedo, handleUndo } = useCanvas('canvas')
 
   const { mode, changeMode } = useMode()
 
@@ -41,6 +41,24 @@ export default function Roof2() {
         >
           텍스트박스 모드
         </button>
+        <button
+          className={`w-30 mx-2 p-2 rounded ${mode === MODE.DRAW_RECT ? 'bg-blue-500' : 'bg-gray-500'} text-white`}
+          onClick={() => changeMode(canvas, MODE.DRAW_RECT)}
+        >
+          사각형 생성 모드
+        </button>
+        <button
+          className="w-30 mx-2 p-2 rounded bg-gray-500 text-white"
+          onClick={handleUndo}
+        >
+          Undo
+        </button>
+        <button
+          className="w-30 mx-2 p-2 rounded bg-gray-500 text-white"
+          onClick={handleRedo}
+        >
+          Redo
+        </button>
       </div>
 
       <div

src/hooks/useCanvas.js

@@ -48,6 +48,9 @@ export function useCanvas(id) {
   useEffect(() => {
     if (canvas) {
       initialize()
+      canvas?.on('object:added', onChange)
+      canvas?.on('object:modified', onChange)
+      canvas?.on('object:removed', onChange)
       canvas?.on('mouse:move', drawMouseLines)
       canvas?.on('mouse:out', removeMouseLines)
     }
@@ -210,15 +213,16 @@ export function useCanvas(id) {
    */
   const handleUndo = () => {
     if (canvas) {
-      if (canvas._objects.length > 0) {
-        const poppedObject = canvas._objects.pop()
+      if (canvas?._objects.length > 0) {
+        const poppedObject = canvas?._objects.pop()
+
         setHistory((prev) => {
           if (prev === undefined) {
             return poppedObject ? [poppedObject] : []
           }
           return poppedObject ? [...prev, poppedObject] : prev
         })
-        canvas.renderAll()
+        canvas?.renderAll()
       }
     }
   }
@@ -227,7 +231,7 @@ export function useCanvas(id) {
     if (canvas && history) {
       if (history.length > 0) {
         setIsLocked(true)
-        canvas.add(history[history.length - 1])
+        canvas?.add(history[history.length - 1])
         const newHistory = history.slice(0, -1)
         setHistory(newHistory)
       }