增加SampleDist采样距离的配置，对过密的曲线开启采样，优化绘制效率

Scripts/Editor/BaseChartEditor.cs

@@ -26,6 +26,7 @@ namespace XCharts
         protected SerializedProperty m_MaxShowDataNumber;
         protected SerializedProperty m_MaxCacheDataNumber;
         protected SerializedProperty m_LineSmoothStyle;
+        protected SerializedProperty m_SampleDist;
 
         protected float m_DefaultLabelWidth;
         protected float m_DefaultFieldWidth;
@@ -50,6 +51,7 @@ namespace XCharts
             m_MaxShowDataNumber = serializedObject.FindProperty("m_MaxShowDataNumber");
             m_MaxCacheDataNumber = serializedObject.FindProperty("m_MaxCacheDataNumber");
             m_LineSmoothStyle = serializedObject.FindProperty("m_LineSmoothStyle");
+            m_SampleDist = serializedObject.FindProperty("m_SampleDist");
         }
 
         public override void OnInspectorGUI()
@@ -96,9 +98,11 @@ namespace XCharts
                 EditorGUILayout.PropertyField(m_MaxShowDataNumber, true);
                 EditorGUILayout.PropertyField(m_MaxCacheDataNumber, true);
                 EditorGUILayout.PropertyField(m_LineSmoothStyle,true);
+                EditorGUILayout.PropertyField(m_SampleDist,true);
                 if (m_MinShowDataNumber.intValue < 0) m_MinShowDataNumber.intValue = 0;
                 if (m_MaxShowDataNumber.intValue < 0) m_MaxShowDataNumber.intValue = 0;
                 if (m_MaxCacheDataNumber.intValue < 0) m_MaxCacheDataNumber.intValue = 0;
+                if (m_SampleDist.floatValue < 0) m_SampleDist.floatValue = 0;
                 EditorGUI.indentLevel--;
             }
         }

Scripts/UI/Internal/BaseChart.cs

@@ -43,6 +43,7 @@ namespace XCharts
         [SerializeField] protected int m_MaxShowDataNumber;
         [SerializeField] protected int m_MaxCacheDataNumber;
         [SerializeField] [Range(1, 8)] private float m_LineSmoothStyle = 2f;
+        [SerializeField] protected float m_SampleDist;
 
         [NonSerialized] private Theme m_CheckTheme = 0;
         [NonSerialized] private Title m_CheckTitle = Title.defaultTitle;

Scripts/UI/Internal/BaseChart_API.cs

@@ -80,6 +80,13 @@ namespace XCharts
         /// <value></value>
         public float lineSmoothStyle { get { return m_LineSmoothStyle; } set { m_LineSmoothStyle = value; } }
 
+        /// <summary>
+        /// the min pixel dist of sample.
+        /// 采样的最小像素距离，默认为0时不采样。当两个数据点间的像素距离小于改值时，开启采样，保证两点间的像素距离不小于改值。
+        /// </summary>
+        /// <value></value>
+        public float sampleDist { get { return m_SampleDist; } set { m_SampleDist = value < 0 ? 0 : value; } }
+
         /// <summary>
         /// Set the size of chart.
         /// 设置图表的大小。

Scripts/UI/LineChart.cs

@@ -163,24 +163,34 @@ namespace XCharts
             int maxCount = maxShowDataNumber > 0 ?
                 (maxShowDataNumber > showData.Count ? showData.Count : maxShowDataNumber)
                 : showData.Count;
+            int i;
             if (seriesHig.Count < minShowDataNumber)
             {
-                for (int i = 0; i < minShowDataNumber; i++)
+                for (i = 0; i < minShowDataNumber; i++)
                 {
                     seriesHig.Add(0);
                 }
             }
-
+            int rate = 1;
-            for (int i = minShowDataNumber; i < maxCount; i++)
+            if (m_SampleDist > 0) rate = (int)((maxCount - minShowDataNumber) / (coordinateWid / m_SampleDist));
+            if (rate < 1) rate = 1;
+            for (i = minShowDataNumber; i < maxCount; i += rate)
             {
                 if (i >= seriesHig.Count)
                 {
-                    seriesHig.Add(0);
+                    for (int j = 0; j < rate; j++) seriesHig.Add(0);
                 }
                 float yValue = showData[i].data[1];
                 seriesHig[i] += GetDataPoint(xAxis, yAxis, showData, yValue, startX, i, scaleWid, seriesHig[i], ref np);
                 serie.dataPoints.Add(np);
-                lp = np;
+            }
+            if (maxCount % rate != 0)
+            {
+                i = maxCount - 1;
+                seriesHig.Add(0);
+                float yValue = showData[i].data[1];
+                seriesHig[i] += GetDataPoint(xAxis, yAxis, showData, yValue, startX, i, scaleWid, seriesHig[i], ref np);
+                serie.dataPoints.Add(np);
             }
             if (serie.dataPoints.Count <= 0)
             {
@@ -191,7 +201,7 @@ namespace XCharts
             float currDetailProgress = lp.x;
             float totalDetailProgress = serie.dataPoints[dataCount - 1].x;
             serie.animation.InitProgress(dataCount, currDetailProgress, totalDetailProgress);
-            for (int i = 1; i < serie.dataPoints.Count; i++)
+            for (i = 1; i < serie.dataPoints.Count; i++)
             {
                 np = serie.dataPoints[i];
                 serie.ClearSmoothList(i);
@@ -331,19 +341,24 @@ namespace XCharts
             int maxCount = maxShowDataNumber > 0 ?
                 (maxShowDataNumber > showData.Count ? showData.Count : maxShowDataNumber)
                 : showData.Count;
+            int i = 0;
             if (seriesHig.Count < minShowDataNumber)
             {
-                for (int i = 0; i < minShowDataNumber; i++)
+                for (i = 0; i < minShowDataNumber; i++)
                 {
                     seriesHig.Add(0);
                 }
             }
             var fine = isStack && m_Series.IsAnyGradientSerie(serie.stack);
-            for (int i = minShowDataNumber; i < maxCount; i++)
+
+            int rate = 1;
+            if (m_SampleDist > 0) rate = (int)((maxCount - minShowDataNumber) / (coordinateWid / m_SampleDist));
+            if (rate < 1) rate = 1;
+            for (i = minShowDataNumber; i < maxCount; i += rate)
             {
                 if (i >= seriesHig.Count)
                 {
-                    seriesHig.Add(0);
+                    for (int j = 0; j < rate; j++) seriesHig.Add(0);
                 }
                 float value = showData[i].data[1];
                 float pY = startY + i * scaleWid;
@@ -352,15 +367,25 @@ namespace XCharts
                 np = new Vector3(pX + dataHig, pY);
                 serie.dataPoints.Add(np);
                 seriesHig[i] += dataHig;
-                lp = np;
             }
-
+            if (maxCount % rate != 0)
+            {
+                i = maxCount - 1;
+                seriesHig.Add(0);
+                float value = showData[i].data[1];
+                float pY = startY + i * scaleWid;
+                float pX = seriesHig[i] + coordinateX + yAxis.axisLine.width;
+                float dataHig = (value - xAxis.minValue) / (xAxis.maxValue - xAxis.minValue) * coordinateWid;
+                np = new Vector3(pX + dataHig, pY);
+                serie.dataPoints.Add(np);
+                seriesHig[i] += dataHig;
+            }
             lp = serie.dataPoints[0];
             int dataCount = serie.dataPoints.Count;
             float currDetailProgress = lp.y;
             float totalDetailProgress = serie.dataPoints[dataCount - 1].y;
             serie.animation.InitProgress(dataCount, currDetailProgress, totalDetailProgress);
-            for (int i = 1; i < serie.dataPoints.Count; i++)
+            for (i = 1; i < serie.dataPoints.Count; i++)
             {
                 np = serie.dataPoints[i];
                 serie.ClearSmoothList(i);