更新README

screenshots/README.md

@@ -0,0 +1,12 @@
+# 截图素材
+
+将以下截图文件放入此目录，替换 README 中的配图：
+
+| 文件 | 说明 | 建议尺寸 |
+|------|------|----------|
+| `designer-overview.png` | 设计器界面全貌，展示控件库 + 画布 + 属性面板 | 1920×1080 |
+| `ai-assistant.png` | AI 助手聊天窗口 + 生成的面单模板 | 1200×800 |
+| `cloud-print.png` | 云打印架构拓扑图 | 1200×800 |
+| `report-design.png` | 报表设计效果（表格 + 图表） | 1200×800 |
+| `desktop-client.png` | C++ Qt 桌面客户端界面 | 1200×800 |
+| `erp-integration.png` | ERP 对接流程示意图 | 1200×800 |

src/core/chartkit/bar.ts

@@ -4,7 +4,7 @@
  * 输出一串 <rect>（按序列分组并排）+ 坐标轴 + 可选网格 + 图例 + 数据标签。
  * 全部用逻辑坐标（viewBox），实际尺寸由外层容器缩放，矢量清晰。
  */
-import { escapeXml, fmt, niceMax, seriesColor, truncate, legendStartX, xAxisLabelPos } from './core'
+import { escapeXml, fmt, niceMax, seriesColor, truncate, legendStartX } from './core'
 import type { ChartModel } from './types'
 
 export function renderBar(model: ChartModel): string {
@@ -21,7 +21,7 @@ export function renderBar(model: ChartModel): string {
   const titleH = title ? 22 : 0
   const mTop = 10 + titleH
   const mRight = 16
-  const mBottom = (showAxis ? 34 : 18) + legendH
+  const mBottom = (showAxis ? 38 : 22) + legendH
   const mLeft = showAxis ? 44 : 16
 
   const px0 = mLeft
@@ -86,16 +86,15 @@ export function renderBar(model: ChartModel): string {
         parts.push(`<text x="${(x + barW * 0.45).toFixed(1)}" y="${(y - 4).toFixed(1)}" text-anchor="middle" font-size="9" fill="#5a6068">${fmt(val)}</text>`)
       }
     }
-    // x 轴标签
+    // x 轴标签：始终以类目为基准居中于对应条带正下方，并与图表留一点间距
     if (showAxis) {
-      const pos = xAxisLabelPos(opt.labelAlign, px0 + band * c, px0 + band * (c + 1), cx)
-      parts.push(`<text x="${pos.x.toFixed(1)}" y="${(py1 + 14).toFixed(1)}" text-anchor="${pos.anchor}" font-size="10" fill="#5a6068">${escapeXml(truncate(String(cats[c] ?? '')))}</text>`)
+      parts.push(`<text x="${cx.toFixed(1)}" y="${(py1 + 18).toFixed(1)}" text-anchor="middle" font-size="10" fill="#5a6068">${escapeXml(truncate(String(cats[c] ?? '')))}</text>`)
     }
   }
 
   // 图例
   if (showLegend) {
-    const align = opt.labelAlign ?? 'left'
+    const align = opt.labelAlign ?? 'center'
     let totalW = 0
     for (let s = 0; s < sCount; s++) {
       const name = model.series[s]!.name || `系列${s + 1}`
@@ -103,7 +102,7 @@ export function renderBar(model: ChartModel): string {
     }
     const startX = legendStartX(align, W, totalW, px0)
     let lx = startX
-    let ly = py1 + (showAxis ? 24 : 10)
+    let ly = py1 + (showAxis ? 30 : 16)
     for (let s = 0; s < sCount; s++) {
       const name = model.series[s]!.name || `系列${s + 1}`
       const color = seriesColor(model.series[s]!, s, opt)

src/core/chartkit/core.ts

@@ -117,15 +117,3 @@ export function legendStartX(
   if (align === 'right') return Math.max(leftPad, W - totalW - 8)
   return leftPad
 }
-
-/** x 轴类目标签的水平对齐 → SVG text-anchor 与基准 x */
-export function xAxisLabelPos(
-  align: 'left' | 'center' | 'right' | undefined,
-  bandLeft: number,
-  bandRight: number,
-  bandCenter: number,
-): { x: number; anchor: 'start' | 'middle' | 'end' } {
-  if (align === 'left') return { x: bandLeft + 4, anchor: 'start' }
-  if (align === 'right') return { x: bandRight - 4, anchor: 'end' }
-  return { x: bandCenter, anchor: 'middle' }
-}

src/core/chartkit/line.ts

@@ -4,7 +4,7 @@
  * 多序列折线 + 坐标轴 + 可选网格 + 图例 + 数据标签。
  * 支持 smooth（Catmull-Rom 平滑曲线）与 area（折线下方面积填充）。
  */
-import { escapeXml, fmt, niceMax, seriesColor, truncate, legendStartX, xAxisLabelPos } from './core'
+import { escapeXml, fmt, niceMax, seriesColor, truncate, legendStartX } from './core'
 import type { ChartModel } from './types'
 
 interface Pt { x: number; y: number }
@@ -43,7 +43,7 @@ export function renderLine(model: ChartModel): string {
   const titleH = title ? 22 : 0
   const mTop = 10 + titleH
   const mRight = 16
-  const mBottom = (showAxis ? 34 : 18) + legendH
+  const mBottom = (showAxis ? 38 : 22) + legendH
   const mLeft = showAxis ? 44 : 16
 
   const px0 = mLeft
@@ -101,8 +101,8 @@ export function renderLine(model: ChartModel): string {
     parts.push(`<line x1="${px0}" y1="${py1}" x2="${px1}" y2="${py1}" stroke="#cccccc" stroke-width="1"/>`)
     for (let c = 0; c < n; c++) {
       const x = px0 + band * (c + 0.5)
-      const pos = xAxisLabelPos(opt.labelAlign, px0 + band * c, px0 + band * (c + 1), x)
-      parts.push(`<text x="${pos.x.toFixed(1)}" y="${(py1 + 14).toFixed(1)}" text-anchor="${pos.anchor}" font-size="10" fill="#5a6068">${escapeXml(truncate(String(cats[c] ?? '')))}</text>`)
+      // x 轴类目标签：始终以类目为基准居中于对应点正下方，并与图表留一点间距
+      parts.push(`<text x="${x.toFixed(1)}" y="${(py1 + 18).toFixed(1)}" text-anchor="middle" font-size="10" fill="#5a6068">${escapeXml(truncate(String(cats[c] ?? '')))}</text>`)
     }
   }
 
@@ -132,7 +132,7 @@ export function renderLine(model: ChartModel): string {
   }
 
   if (showLegend) {
-    const align = opt.labelAlign ?? 'left'
+    const align = opt.labelAlign ?? 'center'
     let totalW = 0
     for (let s = 0; s < seriesPts.length; s++) {
       const name = seriesPts[s]!.name || `系列${s + 1}`
@@ -140,7 +140,7 @@ export function renderLine(model: ChartModel): string {
     }
     const startX = legendStartX(align, W, totalW, px0)
     let lx = startX
-    let ly = py1 + (showAxis ? 24 : 10)
+    let ly = py1 + (showAxis ? 30 : 16)
     for (let s = 0; s < seriesPts.length; s++) {
       const name = seriesPts[s]!.name || `系列${s + 1}`
       const color = seriesPts[s]!.color

src/core/chartkit/pie.ts

@@ -63,7 +63,7 @@ export function renderPie(model: ChartModel): string {
   }
 
   if (showLegend) {
-    const align = opt.labelAlign ?? 'left'
+    const align = opt.labelAlign ?? 'center'
     let totalW = 0
     for (let i = 0; i < data.length; i++) {
       const name = cats[i] ?? `类目${i + 1}`

src/design/panels/props/ChartProps.vue

@@ -113,7 +113,7 @@ const valueLabel = computed({
   set: (v: boolean) => patchOption('valueLabel', v),
 })
 const labelAlign = computed({
-  get: () => control.value?.options?.labelAlign ?? 'left',
+  get: () => control.value?.options?.labelAlign ?? 'center',
   set: (v: 'left' | 'center' | 'right') => patchOption('labelAlign', v),
 })
 const smooth = computed({
@@ -220,7 +220,7 @@ const donut = computed({
       <NSwitch size="small" :value="valueLabel" @update:value="valueLabel = $event" />
     </div>
     <div class="props-row">
-      <span class="props-label">标签对齐</span>
+      <span class="props-label">图例对齐</span>
       <NSelect
         size="small"
         :value="labelAlign"