polygon 선택이 잘 안되는 현상 수정중

src/components/fabric/QPolygon.js

@@ -721,8 +721,7 @@ export const QPolygon = fabric.util.createClass(fabric.Polygon, {
       }
 
       // Ray casting 알고리즘
-      if (((yi > testY) !== (yj > testY)) &&
-          (testX < (xj - xi) * (testY - yi) / (yj - yi) + xi)) {
+      if (yi > testY !== yj > testY && testX < ((xj - xi) * (testY - yi)) / (yj - yi) + xi) {
         inside = !inside
       }
     }
@@ -773,36 +772,140 @@ export const QPolygon = fabric.util.createClass(fabric.Polygon, {
     // 먼저 좌표 업데이트
     this.setCoords()
 
-    // 캔버스 줌과 viewport transform 고려한 좌표 변환
-    let localPoint = point
-    if (this.canvas) {
-      const vpt = this.canvas.viewportTransform
-      if (vpt) {
-        // viewport transform 역변환
-        const inverted = fabric.util.invertTransform(vpt)
-        localPoint = fabric.util.transformPoint(point, inverted)
-      }
+    // 기본 Fabric.js bounding box 체크 먼저 수행
+    if (!this.callSuper('containsPoint', point)) {
+      return false
     }
 
-    // 오브젝트의 transform matrix를 고려한 좌표 변환
+    // 줌 레벨에 관계없이 안정적인 좌표 변환
     const matrix = this.calcTransformMatrix()
     const invertedMatrix = fabric.util.invertTransform(matrix)
-    const transformedPoint = fabric.util.transformPoint(localPoint, invertedMatrix)
 
-    // pathOffset을 고려한 최종 좌표 계산
+    // 캔버스 줌 고려
+    let testPoint = point
+    if (this.canvas && this.canvas.viewportTransform) {
+      const vpt = this.canvas.viewportTransform
+      const invertedVpt = fabric.util.invertTransform(vpt)
+      testPoint = fabric.util.transformPoint(point, invertedVpt)
+    }
+
+    // 오브젝트 좌표계로 변환
+    const localPoint = fabric.util.transformPoint(testPoint, invertedMatrix)
+
+    // pathOffset 적용
     const pathOffset = this.get('pathOffset')
     const finalPoint = {
-      x: transformedPoint.x + pathOffset.x,
-      y: transformedPoint.y + pathOffset.y,
+      x: localPoint.x + pathOffset.x,
+      y: localPoint.y + pathOffset.y,
     }
 
-    if (this.name === POLYGON_TYPE.ROOF && this.isFixed) {
-      const isInside = this.inPolygonImproved(finalPoint)
-      this.set('selectable', isInside)
-      return isInside
-    } else {
-      return this.inPolygonImproved(finalPoint)
+    // 단순하고 안정적인 point-in-polygon 알고리즘 사용
+    return this.simplePointInPolygon(finalPoint, this.get('points'))
+  },
+
+  simplePointInPolygon: function (point, polygon) {
+    const x = point.x
+    const y = point.y
+    let inside = false
+
+    for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
+      const xi = polygon[i].x
+      const yi = polygon[i].y
+      const xj = polygon[j].x
+      const yj = polygon[j].y
+
+      if (yi > y !== yj > y && x < ((xj - xi) * (y - yi)) / (yj - yi) + xi) {
+        inside = !inside
       }
+    }
+
+    return inside
+  },
+
+  isPointInPolygonRobust: function (point, polygon) {
+    const x = point.x
+    const y = point.y
+    let inside = false
+
+    // 부동소수점 정밀도를 고려한 허용 오차
+    const epsilon = 1e-10
+
+    for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
+      const xi = polygon[i].x
+      const yi = polygon[i].y
+      const xj = polygon[j].x
+      const yj = polygon[j].y
+
+      // 점이 정점 위에 있는지 확인 (확장된 허용 오차)
+      if (Math.abs(xi - x) < 0.5 && Math.abs(yi - y) < 0.5) {
+        return true
+      }
+
+      // 점이 선분 위에 있는지 확인
+      if (this.isPointOnLineSegment(point, { x: xi, y: yi }, { x: xj, y: yj })) {
+        return true
+      }
+
+      // Ray casting 알고리즘 - 개선된 버전
+      if (Math.abs(yi - yj) > epsilon) {
+        const minY = Math.min(yi, yj)
+        const maxY = Math.max(yi, yj)
+
+        if (y > minY && y <= maxY) {
+          // 교차점 계산
+          const intersectionX = xi + ((y - yi) / (yj - yi)) * (xj - xi)
+          if (intersectionX > x) {
+            inside = !inside
+          }
+        }
+      }
+    }
+
+    return inside
+  },
+
+  isPointOnLineSegment: function (point, lineStart, lineEnd) {
+    const tolerance = 2.0 // 더 큰 허용 오차
+    const x = point.x
+    const y = point.y
+    const x1 = lineStart.x
+    const y1 = lineStart.y
+    const x2 = lineEnd.x
+    const y2 = lineEnd.y
+
+    // 선분의 길이가 0인 경우 (점)
+    if (Math.abs(x2 - x1) < 1e-10 && Math.abs(y2 - y1) < 1e-10) {
+      return Math.abs(x - x1) < tolerance && Math.abs(y - y1) < tolerance
+    }
+
+    // 점과 선분 사이의 거리 계산
+    const A = x - x1
+    const B = y - y1
+    const C = x2 - x1
+    const D = y2 - y1
+
+    const dot = A * C + B * D
+    const lenSq = C * C + D * D
+    const param = dot / lenSq
+
+    let xx, yy
+
+    if (param < 0 || (x1 === x2 && y1 === y2)) {
+      xx = x1
+      yy = y1
+    } else if (param > 1) {
+      xx = x2
+      yy = y2
+    } else {
+      xx = x1 + param * C
+      yy = y1 + param * D
+    }
+
+    const dx = x - xx
+    const dy = y - yy
+    const distance = Math.sqrt(dx * dx + dy * dy)
+
+    return distance < tolerance
   },
 
   inPolygonABType(x, y, polygon) {