diff --git a/Runtime/Component/VisualMap/VisualMapHelper.cs b/Runtime/Component/VisualMap/VisualMapHelper.cs
index e0b6c65f..42d05c2c 100644
--- a/Runtime/Component/VisualMap/VisualMapHelper.cs
+++ b/Runtime/Component/VisualMap/VisualMapHelper.cs
@@ -76,7 +76,9 @@ namespace XCharts.Runtime
                 if (axis.IsCategory() && axis.boundaryGap)
                 {
                     float startX = grid.context.x + axis.context.scaleWidth / 2;
-                    value = (int)(min + (pos.x - startX) / (grid.context.width - axis.context.scaleWidth) * (max - min));
+                    value = (min + (pos.x - startX) / (grid.context.width - axis.context.scaleWidth) * (max - min));
+                    if (visualMap.IsPiecewise())
+                        value = (int)value;
                 }
                 else
                 {
@@ -87,17 +89,19 @@ namespace XCharts.Runtime
             {
                 min = relativedAxis.context.minValue;
                 max = relativedAxis.context.maxValue;
-
                 if (relativedAxis.IsCategory() && relativedAxis.boundaryGap)
                 {
                     float startY = grid.context.y + relativedAxis.context.scaleWidth / 2;
-                    value = (int)(min + (pos.y - startY) / (grid.context.height - relativedAxis.context.scaleWidth) * (max - min));
+                    value = (min + (pos.y - startY) / (grid.context.height - relativedAxis.context.scaleWidth) * (max - min));
+                    if (visualMap.IsPiecewise())
+                        value = (int)value;
                 }
                 else
                 {
                     value = min + (pos.y - grid.context.y) / grid.context.height * (max - min);
                 }
             }
+
             var color = visualMap.GetColor(value);
             if (ChartHelper.IsClearColor(color))
             {
diff --git a/Runtime/Serie/Line/LineHelper.cs b/Runtime/Serie/Line/LineHelper.cs
index ff1f71f6..dcb9050a 100644
--- a/Runtime/Serie/Line/LineHelper.cs
+++ b/Runtime/Serie/Line/LineHelper.cs
@@ -97,15 +97,13 @@ namespace XCharts.Runtime
                     if (UGLHelper.GetIntersection(lp, tp, axisStartPos, axisEndPos, ref ip))
                         tp = ip;
                 }
+                var zp = isY ? new Vector3(zero, tp.y) : new Vector3(tp.x, zero);
                 if (isVisualMapGradient)
                 {
-                    color = VisualMapHelper.GetLineGradientColor(visualMap, tp, grid, axis, relativedAxis, areaColor);
-                    toColor = color;
-                    lerp = false;
+                    color = VisualMapHelper.GetLineGradientColor(visualMap, zp, grid, axis, relativedAxis, areaColor);
+                    toColor = VisualMapHelper.GetLineGradientColor(visualMap, tp, grid, axis, relativedAxis, areaToColor);
+                    lerp = true;
                 }
-
-                var zp = isY ? new Vector3(zero, tp.y) : new Vector3(tp.x, zero);
-
                 if (i > 0)
                 {
                     if ((lp.y - zero > 0 && tp.y - zero < 0) || (lp.y - zero < 0 && tp.y - zero > 0))