From eb25b161c07ac805436ea53b9c4436c38f072c01 Mon Sep 17 00:00:00 2001
From: ysCha <yscha@interplug.co.kr>
Date: Fri, 14 Nov 2025 19:02:18 +0900
Subject: [PATCH] sk3

---
 src/util/skeleton-utils.js | 83 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/src/util/skeleton-utils.js b/src/util/skeleton-utils.js
index 9f1962c2..e525171b 100644
--- a/src/util/skeleton-utils.js
+++ b/src/util/skeleton-utils.js
@@ -2771,4 +2771,87 @@ function pointToLineDistance(point, lineP1, lineP2) {
   const dx = point.x - xx;
   const dy = point.y - yy;
   return Math.sqrt(dx * dx + dy * dy);
+}
+
+/**
+ * Moves both p1 and p2 in the specified direction by a given distance
+ * @param {Object} p1 - The first point {x, y}
+ * @param {Object} p2 - The second point {x, y}
+ * @param {string} direction - Direction to move ('up', 'down', 'left', 'right')
+ * @param {number} distance - Distance to move
+ * @returns {Object} Object containing the new positions of p1 and p2
+ */
+function moveLineInDirection(p1, p2, direction, distance) {
+  // Create copies to avoid mutating the original points
+  const newP1 = { ...p1 };
+  const newP2 = { ...p2 };
+
+  const move = (point) => {
+    switch (direction.toLowerCase()) {
+      case 'up':
+        point.y -= distance;
+        break;
+      case 'down':
+        point.y += distance;
+        break;
+      case 'left':
+        point.x -= distance;
+        break;
+      case 'right':
+        point.x += distance;
+        break;
+      default:
+        throw new Error('Invalid direction. Use "up", "down", "left", or "right"');
+    }
+    return point;
+  };
+
+  return {
+    p1: move(newP1),
+    p2: move(newP2)
+  };
+}
+
+/**
+ * Determines the direction and distance between original points (p1, p2) and moved points (newP1, newP2)
+ * @param {Object} p1 - Original first point {x, y}
+ * @param {Object} p2 - Original second point {x, y}
+ * @param {Object} newP1 - Moved first point {x, y}
+ * @param {Object} newP2 - Moved second point {x, y}
+ * @returns {Object} Object containing direction and distance of movement
+ */
+function getMovementInfo(p1, p2, newP1, newP2) {
+  // Calculate the movement vector for both points
+  const dx1 = newP1.x - p1.x;
+  const dy1 = newP1.y - p1.y;
+  const dx2 = newP2.x - p2.x;
+  const dy2 = newP2.y - p2.y;
+
+  // Verify that both points moved by the same amount
+  if (dx1 !== dx2 || dy1 !== dy2) {
+    throw new Error('Points did not move in parallel');
+  }
+
+  // Determine the primary direction of movement
+  let direction;
+  const absDx = Math.abs(dx1);
+  const absDy = Math.abs(dy1);
+
+  if (absDx > absDy) {
+    // Horizontal movement is dominant
+    direction = dx1 > 0 ? 'right' : 'left';
+  } else {
+    // Vertical movement is dominant
+    direction = dy1 > 0 ? 'down' : 'up';
+  }
+
+  // Calculate the actual distance moved
+  const distance = Math.sqrt(dx1 * dx1 + dy1 * dy1);
+
+  return {
+    direction,
+    distance,
+    dx: dx1,
+    dy: dy1
+  };
 }
\ No newline at end of file