[feature][axis] support AxisName.onZero (#207)

CHANGELOG.md

@@ -54,6 +54,7 @@
 
 ## master
 
+* (2022.07.05) 增加`AxisName`的`onZero`参数支持设置坐标轴名称位置是否和Y轴0刻度一致 (#207)
 * (2022.07.02) 修复`PieChart`用代码动态创建时`Legend`不正常的问题 (#206)
 * (2022.07.02) 修复`YAxis`的`AxisLabel`设置`onZero`不生效的问题
 * (2022.07.02) 修复`AxisLabel`代码设置`distance`属性后一直刷新的问题

Editor/MainComponents/AxisEditor.cs

@@ -181,6 +181,7 @@ namespace XCharts.Editor
             {
                 ++EditorGUI.indentLevel;
                 PropertyField(prop, "m_Name");
+                PropertyField(prop, "m_OnZero");
                 PropertyField(prop, "m_LabelStyle");
                 --EditorGUI.indentLevel;
             }

Runtime/Component/Axis/AxisHandler.cs

@@ -424,7 +424,8 @@ namespace XCharts
                 var autoColor = axis.axisLine.GetColor(chart.theme.axis.lineColor);
                 if (orient == Orient.Horizonal)
                 {
-                    var posY = GetAxisLineXOrY() + offset.y;
+                    var grid = chart.GetChartComponent<GridCoord>(axis.gridIndex);
+                    var posY = !axis.axisName.onZero && grid != null? grid.context.y : GetAxisLineXOrY() + offset.y;
                     switch (axis.axisName.labelStyle.position)
                     {
                         case LabelStyle.Position.Start:
@@ -460,7 +461,8 @@ namespace XCharts
                 }
                 else
                 {
-                    var posX = GetAxisLineXOrY() + offset.x;
+                    var grid = chart.GetChartComponent<GridCoord>(axis.gridIndex);
+                    var posX = !axis.axisName.onZero && grid != null? grid.context.x : GetAxisLineXOrY() + offset.x;
                     switch (axis.axisName.labelStyle.position)
                     {
                         case LabelStyle.Position.Start:

Runtime/Component/Axis/AxisName.cs

@@ -12,11 +12,12 @@ namespace XCharts.Runtime
     {
         [SerializeField] private bool m_Show;
         [SerializeField] private string m_Name;
+        [SerializeField][Since("v3.1.0")] private bool m_OnZero;
         [SerializeField] private LabelStyle m_LabelStyle = new LabelStyle();
 
         /// <summary>
         /// Whether to show axis name.
-        /// |是否显示坐标名称。
+        /// |是否显示坐标轴名称。
         /// </summary>
         public bool show
         {
@@ -33,6 +34,15 @@ namespace XCharts.Runtime
             set { if (PropertyUtil.SetClass(ref m_Name, value)) SetComponentDirty(); }
         }
         /// <summary>
+        /// Whether the axis name position are the same with 0 position of YAxis.
+        /// |坐标轴名称的位置是否保持和Y轴0刻度一致。
+        /// </summary>
+        public bool onZero
+        {
+            get { return m_OnZero; }
+            set { if (PropertyUtil.SetStruct(ref m_OnZero, value)) SetComponentDirty(); }
+        }
+        /// <summary>
         /// The text style of axis name.
         /// |文本样式。
         /// </summary>