version bump 1.21.0

server.js

@@ -193,6 +193,9 @@ function buildChartOption(params) {
         leftAxisMax = '',
         rightAxisMin = '',
         rightAxisMax = '',
+        xLabelRotate = '',
+        xLabelInterval = '',
+        xLabelFontSize = 0,
         width = 800
     } = params;
 
@@ -476,9 +479,11 @@ function buildChartOption(params) {
             axisLine: { lineStyle: { color: axisLineColor } },
             axisLabel: {
                 color: textColor,
-                fontSize: 12,
+                fontSize: xLabelFontSize > 0 ? xLabelFontSize : 12,
-                interval: 0,
+                interval: xLabelInterval === '' ? 0 : Number(xLabelInterval),
-                rotate: parsedData.categories.length > 10 ? 30 : 0
+                rotate: xLabelRotate === ''
+                    ? (parsedData.categories.length > 10 ? 30 : 0)
+                    : Number(xLabelRotate)
             },
             axisTick: { show: false }
         },
@@ -1151,7 +1156,7 @@ app.get('/api/health', (req, res) => {
     res.json({
         status: 'ok',
         service: 'data-chart-tool',
-        version: '1.20.0',
+        version: '1.21.0',
         endpoints: {
             'POST /api/chart': '生成图表图片（JSON body）',
             'GET /api/chart': '生成图表图片（URL 参数）',
@@ -1171,7 +1176,7 @@ app.get('/api/health', (req, res) => {
 app.get('/api/docs', (req, res) => {
     res.json({
         name: '数据可视化图表生成器 API',
-        version: '1.20.0',
+        version: '1.21.0',
         endpoints: [
             {
                 method: 'POST',