refactor: various improvements

src/core/region.ts

@@ -28,36 +28,36 @@ export type RegionAxis = {
 export function applyAlign(region: Region){
   if (region.children.length === 0) return;
 
-  // 对每个 axis 分别处理，但保持空间关系
+  // Process each axis independently while preserving spatial relationships
   for (let axisIndex = 0; axisIndex < region.axes.length; axisIndex++) {
     const axis = region.axes[axisIndex];
     if (!axis.align) continue;
 
-    // 收集当前轴上的所有唯一位置值，保持原有顺序
+    // Collect all unique position values on this axis, preserving original order
     const positionValues = new Set<number>();
     for (const accessor of region.children) {
       positionValues.add(accessor.value.position[axisIndex] ?? 0);
     }
 
-    // 排序位置值
+    // Sort position values
     const sortedPositions = Array.from(positionValues).sort((a, b) => a - b);
 
-    // 创建位置映射：原位置 -> 新位置
+    // Create position mapping: old position -> new position
     const positionMap = new Map<number, number>();
 
     if (axis.align === 'start' && axis.min !== undefined) {
-      // 从 min 开始紧凑排列，保持相对顺序
+      // Compact from min, preserving relative order
       sortedPositions.forEach((pos, index) => {
         positionMap.set(pos, axis.min! + index);
       });
     } else if (axis.align === 'end' && axis.max !== undefined) {
-      // 从 max 开始向前紧凑排列
+      // Compact towards max
       const count = sortedPositions.length;
       sortedPositions.forEach((pos, index) => {
         positionMap.set(pos, axis.max! - (count - 1 - index));
       });
     } else if (axis.align === 'center') {
-      // 居中排列
+      // Center alignment
       const count = sortedPositions.length;
       const min = axis.min ?? 0;
       const max = axis.max ?? count - 1;
@@ -70,14 +70,14 @@ export function applyAlign(region: Region){
       });
     }
 
-    // 应用位置映射到所有 part
+    // Apply position mapping to all parts
     for (const accessor of region.children) {
       const currentPos = accessor.value.position[axisIndex] ?? 0;
       accessor.value.position[axisIndex] = positionMap.get(currentPos) ?? currentPos;
     }
   }
 
-  // 最后按所有轴排序 children
+  // Sort children by all axes at the end
   region.children.sort((a, b) => {
     for (let i = 0; i < region.axes.length; i++) {
       const diff = (a.value.position[i] ?? 0) - (b.value.position[i] ?? 0);