* UILineChart：增加X轴为日期类型，曲线Y轴可分段显示颜色。

SunnyUI.Demo/Charts/FLineChart.Designer.cs

@@ -76,6 +76,7 @@
             this.uiImageButton3.TabStop = false;
             this.uiImageButton3.Text = "      Dark";
             this.uiImageButton3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
+            this.uiImageButton3.Click += new System.EventHandler(this.uiImageButton3_Click);
             // 
             // uiImageButton2
             // 
@@ -89,6 +90,7 @@
             this.uiImageButton2.TabStop = false;
             this.uiImageButton2.Text = "      Plain";
             this.uiImageButton2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
+            this.uiImageButton2.Click += new System.EventHandler(this.uiImageButton2_Click);
             // 
             // uiImageButton1
             // 
@@ -102,6 +104,7 @@
             this.uiImageButton1.TabStop = false;
             this.uiImageButton1.Text = "      Default";
             this.uiImageButton1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
+            this.uiImageButton1.Click += new System.EventHandler(this.uiImageButton1_Click);
             // 
             // uiLine1
             // 
@@ -111,7 +114,7 @@
             this.uiLine1.Name = "uiLine1";
             this.uiLine1.Size = new System.Drawing.Size(670, 20);
             this.uiLine1.TabIndex = 30;
-            this.uiLine1.Text = "UIBarChart";
+            this.uiLine1.Text = "UILineChart";
             this.uiLine1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
             // 
             // LineChart

SunnyUI.Demo/Charts/FLineChart.cs

@@ -11,7 +11,7 @@ namespace Sunny.UI.Demo.Charts
             InitializeComponent();
         }
 
-        private void uiSymbolButton1_Click(object sender, System.EventArgs e)
+        private void uiSymbolButton1_Click(object sender, EventArgs e)
         {
             UILineOption option = new UILineOption();
             option.Title = new UITitle();
@@ -33,7 +33,7 @@ namespace Sunny.UI.Demo.Charts
             series.SymbolLineWidth = 2;
             series.SymbolColor = Color.Red;
 
-            series = option.AddSeries(new UILineSeries("Line2"));
+            series = option.AddSeries(new UILineSeries("Line2", Color.Lime));
             series.Add(dt.AddHours(0.3), 3.3);
             series.Add(dt.AddHours(0.4), 2.3);
             series.Add(dt.AddHours(0.5), 2.3);
@@ -51,6 +51,12 @@ namespace Sunny.UI.Demo.Charts
             // option.XAxis.MaxAuto = false;
             // option.XAxis.MinAuto = false;
 
+            option.GreaterWarningArea = new UILineWarningArea(3.5);
+            option.LessWarningArea = new UILineWarningArea(2.2, Color.Gold);
+
+            option.YAxisScaleLines.Add(new UIScaleLine() { Color = Color.Red, Name = "上限", Value = 3.5 });
+            option.YAxisScaleLines.Add(new UIScaleLine() { Color = Color.Gold, Name = "下限", Value = 2.2 });
+
             option.XAxis.Name = "数值";
             option.YAxis.Name = "数值";
 
@@ -68,5 +74,20 @@ namespace Sunny.UI.Demo.Charts
 
             Console.WriteLine(sb.ToString());
         }
+
+        private void uiImageButton1_Click(object sender, System.EventArgs e)
+        {
+            LineChart.ChartStyleType = UIChartStyleType.Default;
+        }
+
+        private void uiImageButton2_Click(object sender, System.EventArgs e)
+        {
+            LineChart.ChartStyleType = UIChartStyleType.Plain;
+        }
+
+        private void uiImageButton3_Click(object sender, System.EventArgs e)
+        {
+            LineChart.ChartStyleType = UIChartStyleType.Dark;
+        }
     }
 }

SunnyUI/Charts/UILineChart.cs

@@ -184,10 +184,10 @@ namespace Sunny.UI
             // if (BarOption.ToolTip != null && BarOption.ToolTip.AxisPointer.Type == UIAxisPointerType.Shadow) DrawToolTip(g);
             DrawAxis(g);
             DrawTitle(g, LineOption.Title);
+            DrawAxisScales(g);
             DrawSeries(g);
             // if (BarOption.ToolTip != null && BarOption.ToolTip.AxisPointer.Type == UIAxisPointerType.Line) DrawToolTip(g);
             DrawLegend(g, LineOption.Legend);
-            DrawAxisScales(g);
         }
 
         private void DrawAxis(Graphics g)
@@ -308,16 +308,83 @@ namespace Sunny.UI
                 Color color = series.Color;
                 if (!series.CustomColor) color = ChartStyle.GetColor(idx);
 
-                using (Pen pen = new Pen(color, series.Width))
+                if (LineOption.GreaterWarningArea == null && LineOption.LessWarningArea == null)
                 {
-                    g.SetHighQuality();
+                    using (Pen pen = new Pen(color, series.Width))
-                    if (series.Smooth)
+                    {
-                        g.DrawCurve(pen, series.Points.ToArray());
+                        g.SetHighQuality();
-                    else
+                        if (series.Smooth)
-                        g.DrawLines(pen, series.Points.ToArray());
+                            g.DrawCurve(pen, series.Points.ToArray());
-                    g.SetDefaultQuality();
+                        else
+                            g.DrawLines(pen, series.Points.ToArray());
+                        g.SetDefaultQuality();
+                    }
                 }
+                else
+                {
+                    Bitmap bmp = new Bitmap(Width, Height);
+                    Bitmap bmpGreater;
+                    Bitmap bmpLess;
 
+                    float wTop = 0;
+                    float wBottom = Height;
+
+                    using (Pen pen = new Pen(color, series.Width))
+                    {
+                        Graphics graphics = bmp.Graphics();
+                        graphics.SetHighQuality();
+                        if (series.Smooth)
+                            graphics.DrawCurve(pen, series.Points.ToArray());
+                        else
+                            graphics.DrawLines(pen, series.Points.ToArray());
+                        graphics.SetDefaultQuality();
+                    }
+
+                    if (LineOption.GreaterWarningArea != null)
+                    {
+                        using (Pen pen = new Pen(LineOption.GreaterWarningArea.Color, series.Width))
+                        using (bmpGreater = new Bitmap(Width, Height))
+                        {
+                            bmpGreater = new Bitmap(Width, Height);
+                            Graphics graphics = bmpGreater.Graphics();
+                            graphics.SetHighQuality();
+                            if (series.Smooth)
+                                graphics.DrawCurve(pen, series.Points.ToArray());
+                            else
+                                graphics.DrawLines(pen, series.Points.ToArray());
+                            graphics.SetDefaultQuality();
+
+                            wTop = (float)((LineOption.GreaterWarningArea.Value - YAxisStart * YAxisInterval) * 1.0f * DrawSize.Height / YAxisInterval / (YAxisEnd - YAxisStart));
+                            wTop = DrawOrigin.Y - wTop;
+                            g.DrawImage(bmpGreater, new Rectangle(0, 0, Width, (int)wTop),
+                                new Rectangle(0, 0, Width, (int)wTop), GraphicsUnit.Pixel);
+                        }
+                    }
+
+                    if (LineOption.LessWarningArea != null)
+                    {
+                        using (Pen pen = new Pen(LineOption.LessWarningArea.Color, series.Width))
+                        using (bmpLess = new Bitmap(Width, Height))
+                        {
+                            Graphics graphics = bmpLess.Graphics();
+                            graphics.SetHighQuality();
+                            if (series.Smooth)
+                                graphics.DrawCurve(pen, series.Points.ToArray());
+                            else
+                                graphics.DrawLines(pen, series.Points.ToArray());
+                            graphics.SetDefaultQuality();
+
+                            wBottom = (float)((LineOption.LessWarningArea.Value - YAxisStart * YAxisInterval) * 1.0f * DrawSize.Height / YAxisInterval / (YAxisEnd - YAxisStart));
+                            wBottom = DrawOrigin.Y - wBottom;
+                            g.DrawImage(bmpLess, new Rectangle(0, (int)wBottom, Width, Height - (int)wBottom),
+                                new Rectangle(0, (int)wBottom, Width, Height - (int)wBottom), GraphicsUnit.Pixel);
+                        }
+                    }
+
+                    g.DrawImage(bmp, new Rectangle(0, (int)wTop, Width, (int)wBottom - (int)wTop),
+                        new Rectangle(0, (int)wTop, Width, (int)wBottom - (int)wTop), GraphicsUnit.Pixel);
+                    bmp.Dispose();
+                }
 
                 if (series.Symbol != UILinePointSymbol.None)
                 {

SunnyUI/Charts/UILineChartOption.cs

@@ -30,6 +30,9 @@ namespace Sunny.UI
 
         public readonly List<UIScaleLine> YAxisScaleLines = new List<UIScaleLine>();
 
+        public UILineWarningArea GreaterWarningArea { get; set; }
+        public UILineWarningArea LessWarningArea { get; set; }
+
         public UILineSeries AddSeries(UILineSeries series)
         {
             if (series.Name.IsNullOrEmpty()) return null;
@@ -278,4 +281,27 @@ namespace Sunny.UI
 
         public double Y { get; set; }
     }
+
+    public class UILineWarningArea
+    {
+        public double Value { get; set; }
+
+        public Color Color { get; set; } = Color.Red;
+
+        public UILineWarningArea()
+        {
+
+        }
+
+        public UILineWarningArea(double value)
+        {
+            Value = value;
+        }
+
+        public UILineWarningArea(double value, Color color)
+        {
+            Value = value;
+            Color = color;
+        }
+    }
 }