c#语言编程中GDI+的运用
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c#语言编程中GDI+的运用
简介：c#语言编程中GDI+的运用，主要是利用利用C#中System.Drawing命名空间中的类进行操作，
自定义生成各种图形，此文章我们要完成是根据统计数据，
输出各种统计统计图形，包括饼状图、曲线分析图、柱形图、多组
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以Winform窗体输出为例，首先我们需要建立个一个类，我在这命名为ComFuctions，主要功能是生成各种图形的基本和完成的绘制操作
在此类中需要填写的代码分为以下几个模块：
一、颜色，画框
二、绘制图例框，绘制扇形
三、绘制基本图形
四、绘制Y轴坐标数据
五、建立坐标轴
六、获取某个数值在坐标系中的位置
七、绘制饼状图
八、绘制曲线图
九、绘制柱状图
十、绘制多组数据曲线图
十一、绘制弧形曲线图
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一、颜色，画框
#region // 颜色，画框， /// <summary> /// 生成随机颜色 /// </summary> /// <returns></returns> private static Color GetRandomColor(int seed) { Random random = new Random(seed); int r = 0; int g = 0; int b = 0; r = random.Next(0, 230); g = random.Next(0, 230); b = random.Next(0, 235); Color randomcolor = Color.FromArgb(r, g, b); return randomcolor; } /// <summary> /// 绘制矩形区域框，框何其阴影 /// </summary> /// <param name="image">图形</param> /// <param name="rect">矩形框对象</param> /// <returns>图形</returns> private static Bitmap DrawRectangle(Bitmap image, Rectangle rect) { Bitmap Image = image; Graphics g = Graphics.FromImage(Image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { Rectangle rn = new Rectangle(rect.X + 3, rect.Y + 3, rect.Width, rect.Height); SolidBrush brush1 = new SolidBrush(Color.FromArgb(233, 234, 249)); SolidBrush brush2 = new SolidBrush(Color.FromArgb(221, 213, 215)); // g.FillRectangle(brush2, rn); g.FillRectangle(brush1, rect); return Image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
二、绘制图例框，绘制扇形
#region //绘制图例框，绘制扇形 /// <summary> /// 绘制图例信息 /// </summary> /// <param name="image">图像</param> /// <param name="rect">第一个矩形框</param> /// <param name="c">颜色</param> /// <param name="DesStr">图例说明文字</param> /// <param name="f">文字样式</param> /// <param name="i">图例说明序号</param> /// <returns>图形</returns> private static Bitmap DrawDes(Bitmap image, Rectangle rect, Color c, string DesStr, Font f, int i) { Bitmap Image = image; Graphics g = Graphics.FromImage(Image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { SolidBrush brush = new SolidBrush(c); // Rectangle R = new Rectangle(rect.X, rect.Y + 18 * i, rect.Width, rect.Height); Point p = new Point(rect.X + 12, rect.Y + 18 * i); //❀颜色矩形框 g.FillRectangle(brush, R); //文字说明 g.DrawString(DesStr, f, new SolidBrush(Color.Black), p); return Image; } finally { g.Dispose(); } } //绘制扇形 private static Bitmap DrawPie(Bitmap image, Rectangle rect, Color c, int Angle1, int Angle2) { Bitmap Image = image; Graphics g = Graphics.FromImage(Image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { SolidBrush brush = new SolidBrush(c); // Rectangle R = new Rectangle(rect.X, rect.Y, rect.Width, rect.Height); g.FillPie(brush, R, Angle1, Angle2); return Image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
三、绘制基本图形
#region//绘制基本图形 /// <summary> /// 生成图片，统一设置图片大小、背景色,图片布局，及标题 /// </summary> /// <returns>图片</returns> private static Bitmap GenerateImage(string Title) { //图片大小：宽度、高度 int width = 600; int height = 420; //标题 Point PTitle = new Point(30, 20); Font f1 = new Font("宋体", 10, FontStyle.Bold); //线 Point PLine1 = new Point(20, 40); Point PLine2 = new Point(390, 40); Pen pen = new Pen(new SolidBrush(Color.FromArgb(8, 34, 231)), 1.5f); //主区域,主区域图形 Rectangle RMain1 = new Rectangle(20, 55, 410, 345); Rectangle RMain2 = new Rectangle(25, 60, 400, 335); //图例区域 Rectangle RDes1 = new Rectangle(440, 55, 150, 345); //图例说明 string Des = "图例说明："; Font f2 = new Font("新宋体", 9, FontStyle.Bold); Point PDes = new Point(445, 65); //图例信息，后面的x坐标上累加20 Rectangle RDes2 = new Rectangle(445, 90, 10, 10); Bitmap image = new Bitmap(width, height); // Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { //设置背景色、绘制边框 g.Clear(Color.White); g.DrawRectangle(new Pen(Color.Black), 0, 0, width - 1, height - 1); //绘制标题、线 g.DrawString(Title, f1, new SolidBrush(Color.Black), PTitle); g.DrawLine(pen, PLine1, PLine2); //主区域 image = DrawRectangle(image, RMain1); //图例区域 image = DrawRectangle(image, RDes1); //“图例说明” g.DrawString(Des, f2, new SolidBrush(Color.Black), PDes); //return return image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
四、绘制Y轴坐标数据
#region //获取Y轴坐标数据 /* 坐标轴实现算法描述： * X轴坐标根据项目数量把X轴均等分，有效长度350， * Y轴有效长度280，平分为10个等分，即有十个点； * Y轴的数值算法：第一个点位最小值，然后每个等分所对应的值是（最大值-最小值）/9， */ /// <summary> /// 获取Y轴坐标的点分布值 /// </summary> /// <param name="ItemValue">项目数值</param> /// <param name="YCount">Y轴点的数量</param> /// <returns>图形</returns> private static int[] GetYValue(decimal[] ItemValue, int YCount) { int len = ItemValue.Length; int[] Value = new int[YCount]; int Max = Convert.ToInt32(ItemValue.Max()); int Min = Convert.ToInt32(ItemValue.Min()); int Distance = Convert.ToInt32((Max - Min) / (YCount - 1)); for (int i = 0; i < YCount; i++) { Value[i] = Min + Distance * i; } //Value[YCount - 1] = Max; return Value; } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
五、建立坐标轴
#region //建立坐标轴 /// <summary> /// 绘制坐标轴，X、Y轴的坐标值 /// </summary> /// <param name="image">图像</param> /// <param name="ItemName">项目名称</param> /// <param name="ItemValue">项目数值</param> /// <returns>图像</returns> private static Bitmap DrawCoordinate(Bitmap image, string[] ItemName, decimal[] ItemValue) { //坐标轴 Point P0 = new Point(60, 360); Point Px = new Point(420, 360); Point Py = new Point(60, 65); Pen pen = new Pen(Color.Black); //箭头 Point Py1 = new Point(58, 70); Point Py2 = new Point(62, 70); Point Px1 = new Point(415, 358); Point Px2 = new Point(415, 362); //Y,X Value //y 280-10 int YCount = 10;//Y轴点的数量 int YDistance = Convert.ToInt32(280 / YCount);//Y轴点击的距离 int[] YValue = GetYValue(ItemValue, YCount); int len = 3;//短线的长度 int XCount = ItemName.Length;//X轴点的数量 int XDistance = Convert.ToInt32(350 / XCount);//X轴点间的距离 // Font f = new Font("新宋体", 8, FontStyle.Bold); //Image Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { //绘制坐标轴线 g.DrawLine(pen, P0, Px); g.DrawLine(pen, P0, Py); //箭头 g.DrawLine(pen, Py, Py1); g.DrawLine(pen, Py, Py2); g.DrawLine(pen, Px, Px1); g.DrawLine(pen, Px, Px2); //X for (int i = 1; i <= XCount; i++) { Point pl1 = new Point(P0.X + i * XDistance, P0.Y); Point pl2 = new Point(P0.X + i * XDistance, P0.Y - len); string str = ItemName[i - 1]; Point ps = new Point(pl1.X - (str.Length * 8), pl1.Y + 5); g.DrawLine(pen, pl1, pl2); g.DrawString(str, f, new SolidBrush(Color.Black), ps); } //Y for (int i = 1; i <= YCount; i++) { Point pl1 = new Point(P0.X, P0.Y - YDistance * i); Point pl2 = new Point(pl1.X + len, pl1.Y); string str = YValue[i - 1].ToString(); Point ps = new Point(pl1.X - str.Length * 8, pl1.Y - 5); g.DrawLine(pen, pl1, pl2); g.DrawString(str, f, new SolidBrush(Color.Black), ps); } //0 g.DrawString("0", f, new SolidBrush(Color.Black), new Point(P0.X - 10, P0.Y - 10)); //return return image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
六、获取某个数值在坐标系中的位置
#region //获取某个数值在坐标系中的位置 /// <summary> /// 获取某个数值在坐标系中的位置 /// </summary> /// <param name="Value">当前数值</param> /// <param name="ItemValue">所有数值</param> /// <returns>位置</returns> private static int GetCoordinateValue(decimal Value, decimal[] ItemValue) { //y 280-10 //get y value int[] YValue = GetYValue(ItemValue, 10); int Max = YValue.Max(); int Min = YValue.Min(); float AvgDis = (Max - Min) / 9; float tt = (Convert.ToSingle(Value) - Min) / AvgDis; int m = Convert.ToInt32(tt * 28); m = 360 - 28 - m; //if((Convert.ToInt32(Value)) >= Max) // m=80; //else if (Convert.ToInt32(Value) <= Min) // m=332; return m; } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
七、绘制饼状图
#region //绘制饼状图************************ /// <summary> /// 计算数值综合 /// </summary> /// <param name="Value"></param> /// <returns></returns> private static decimal Sum(decimal[] Value) { decimal t = 0; foreach (decimal d in Value) { t += d; } return t; } /// <summary> /// 计算各项比例 /// </summary> /// <param name="Value"></param> /// <returns></returns> private static decimal[] GetItemRate(decimal[] Value) { decimal sum = Sum(Value); decimal[] ItemRate = new decimal[Value.Length]; for (int i = 0; i < Value.Length; i++) { ItemRate[i] = Value[i] / sum; } return ItemRate; } /// <summary> /// 根据比例，计算各项角度值 /// </summary> /// <param name="ItemRate"></param> /// <returns></returns> private static int[] GetItemAngle(decimal[] ItemRate) { int[] ItemAngel = new int[ItemRate.Length]; for (int i = 0; i < ItemRate.Length; i++) { decimal t = 360 * ItemRate[i]; ItemAngel[i] = Convert.ToInt32(t); } return ItemAngel; } /// <summary> /// 绘制饼图(主要是分析不同类型的数值所占比例)，参数有图的标题，项目名称，项目的数值，名称和数值都是长度对应的 /// </summary> /// <param name="Title">图的标题</param> /// <param name="ItemName">项目名称</param> /// <param name="ItemValue">项目的数值</param> /// <returns>Bitmap图形</returns> public static Bitmap GetPieImage(string Title, string[] ItemName, decimal[] ItemValue) { Bitmap image = GenerateImage(Title); // //主区域图形 Rectangle RMain = new Rectangle(35, 70, 350, 270); //图例信息 Rectangle RDes = new Rectangle(445, 90, 10, 10); Font f = new Font("新宋体", 9, FontStyle.Bold); Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { //分析数据，绘制饼图和图例说明 decimal[] ItemRate = GetItemRate(ItemValue); int[] ItemAngle = GetItemAngle(ItemRate); int Angle1 = 0; int Angle2 = 0; int len = ItemValue.Length; Color c = new Color(); //3D g.DrawPie(new Pen(Color.Black), RMain, 0F, 360F); g.DrawPie(new Pen(Color.Black), new Rectangle(RMain.X, RMain.Y + 10, RMain.Width, RMain.Height), 0F, 360F); g.FillPie(new SolidBrush(Color.Black), new Rectangle(RMain.X, RMain.Y + 10, RMain.Width, RMain.Height), 0F, 360F); //绘制 for (int i = 0; i < len; i++) { Angle2 = ItemAngle[i]; //if (c != GetRandomColor(i)) c = GetRandomColor(i); SolidBrush brush = new SolidBrush(c); string DesStr = ItemName[i] + "(" + (ItemRate[i] * 100).ToString(".00") + "%" + ")" + ItemValue[i].ToString(".00"); // DrawPie(image, RMain, c, Angle1, Angle2); Angle1 += Angle2; DrawDes(image, RDes, c, DesStr, f, i); } return image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
八、绘制曲线图
#region //绘制曲线图**************************** /// <summary> /// 绘制曲线图(主要是分析不同类型的数值所占比例，或者同意项目不同状态下的值和趋势)，参数有图的标题，项目名称，项目的数值，名称和数值都是长度对应的 /// </summary> /// <param name="Title">图的标题</param> /// <param name="ItemName">项目名称</param> /// <param name="ItemValue">项目的数值</param> /// <returns>Bitmap图形</returns> public static Bitmap GetLineImage(string Title, string[] ItemName, decimal[] ItemValue) { Bitmap image = GenerateImage(Title); image = DrawCoordinate(image, ItemName, ItemValue); Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { int PNum = ItemName.Length; Point[] Pts = new Point[PNum]; //坐标轴 Point P0 = new Point(60, 360); Point Px = new Point(420, 360); Point Py = new Point(60, 65); Pen pen = new Pen(Color.Black); // int XCount = ItemName.Length;//X轴点的数量 int XDistance = Convert.ToInt32(350 / XCount);//X轴点间的距离 //图例 Rectangle RDes = new Rectangle(445, 90, 10, 10); Font f = new Font("新宋体", 9, FontStyle.Bold); // for (int i = 0; i < PNum; i++) { int x = P0.X + (i + 1) * XDistance; int y = GetCoordinateValue(ItemValue[i], ItemValue); Pts[i] = new Point(x, y); } //把点连起来 for (int i = 1; i < PNum; i++) { g.DrawLine(pen, Pts[i - 1], Pts[i]); } //画图例说明 Color c = GetRandomColor(3); for (int i = 0; i < PNum; i++) { string str = ItemName[i] + ":" + ItemValue[i].ToString(); DrawDes(image, RDes, c, str, f, i); } //return return image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
九、绘制柱状图
#region //绘制柱状图********************* /// <summary> /// 绘制柱状图(主要是分析某一个项目在不同状态下的值，获取其发展趋势)，参数有图的标题，项目名称，项目的数值，名称和数值都是长度对应的 /// </summary> /// <param name="Title">图的标题</param> /// <param name="ItemName">项目名称</param> /// <param name="ItemValue">项目的数值</param> /// <returns>Bitmap图形</returns> public static Bitmap GetColumnImage(string Title, string[] ItemName, decimal[] ItemValue) { Bitmap image = GenerateImage(Title); DrawCoordinate(image, ItemName, ItemValue); Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { int PNum = ItemName.Length; Point[] Pts = new Point[PNum]; //坐标轴 Point P0 = new Point(60, 360); Point Px = new Point(420, 360); Point Py = new Point(60, 65); Pen pen = new Pen(Color.Black); // int XCount = ItemName.Length;//X轴点的数量 int XDistance = Convert.ToInt32(350 / XCount);//X轴点间的距离 //图例 Rectangle RDes = new Rectangle(445, 90, 10, 10); Font f = new Font("新宋体", 9, FontStyle.Bold); //获取值所对应的点 for (int i = 0; i < PNum; i++) { int x = P0.X + (i + 1) * XDistance; int y = GetCoordinateValue(ItemValue[i], ItemValue); Pts[i] = new Point(x, y); } //绘制条形框图 Color c = GetRandomColor(0); for (int i = 0; i < PNum; i++) { Rectangle rect = new Rectangle(Pts[i].X - 5, Pts[i].Y, 10, P0.Y - Pts[i].Y); Font ff = new Font("新宋体", 8, FontStyle.Regular); g.DrawString(ItemValue[i].ToString(".00"), f, new SolidBrush(Color.Black), new Point(Pts[i].X - 15, Pts[i].Y - 12)); g.DrawRectangle(new Pen(Color.Black), rect); g.FillRectangle(new SolidBrush(c), rect); } //画图例说明 for (int i = 0; i < PNum; i++) { string str = ItemName[i] + ":" + ItemValue[i].ToString(); DrawDes(image, RDes, c, str, f, i); } //return return image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
十、绘制多组数据曲线图
#region //绘制多组数据曲线图******************** /// <summary> /// 获取二维数组中的最大值 /// </summary> /// <param name="ItemValues"></param> /// <returns></returns> private static int GetMax(decimal[][] ItemValues) { int Max = 0; for (int i = 0; i < ItemValues.Length; i++) { int t = Convert.ToInt32(ItemValues[i].Max()); if (i == 0) Max = t; if (Max <= t) Max = t; } return Max; } /// <summary> /// 获取二维数组中的最小值 /// </summary> /// <param name="ItemValues"></param> /// <returns></returns> private static int GetMin(decimal[][] ItemValues) { int Min = 0; for (int i = 0; i < ItemValues.Length; i++) { int t = Convert.ToInt32(ItemValues[i].Min()); if (i == 0) Min = t; if (Min >= t) Min = t; } return Min; } /// <summary> /// 获取Y轴上点的数值 /// </summary> /// <param name="ItemValues"></param> /// <param name="YCount"></param> /// <returns></returns> private static int[] GetYValue(decimal[][] ItemValues, int YCount) { int[] Value = new int[YCount]; int Max = GetMax(ItemValues); int Min = GetMin(ItemValues); int Distance = Convert.ToInt32((Max - Min) / (YCount - 1)); for (int i = 0; i < YCount; i++) { Value[i] = Min + Distance * i; } //Value[YCount - 1] = Max; return Value; } /// <summary> /// 获取某个数值在坐标系中的位置 /// </summary> /// <param name="Value">当前数值</param> /// <param name="ItemValue">所有数值</param> /// <returns>位置</returns> private static int GetCoordinateValue(decimal Value, decimal[][] ItemValues) { //y 280-10 //get y value int[] YValue = GetYValue(ItemValues, 10); int Max = GetMax(ItemValues); int Min = GetMin(ItemValues); float AvgDis = (Max - Min) / 9; float tt = (Convert.ToSingle(Value) - Min) / AvgDis; int m = Convert.ToInt32(tt * 28); m = 360 - 28 - m; return m; } /// <summary> /// 绘制坐标轴，X、Y轴的坐标值 /// </summary> /// <param name="image">图像</param> /// <param name="ItemName">项目名称</param> /// <param name="ItemValues">多组项目数值</param> /// <returns>图像</returns> private static Bitmap DrawCoordinate(Bitmap image, string[] ItemName, decimal[][] ItemValues) { //坐标轴 Point P0 = new Point(60, 360); Point Px = new Point(420, 360); Point Py = new Point(60, 65); Pen pen = new Pen(Color.Black); //箭头 Point Py1 = new Point(58, 70); Point Py2 = new Point(62, 70); Point Px1 = new Point(415, 358); Point Px2 = new Point(415, 362); //Y,X Value //y 280-10 int YCount = 10;//Y轴点的数量 int YDistance = Convert.ToInt32(280 / YCount);//Y轴点击的距离 int[] YValue = GetYValue(ItemValues, YCount); int len = 3;//短线的长度 int XCount = ItemName.Length;//X轴点的数量 int XDistance = Convert.ToInt32(350 / XCount);//X轴点间的距离 // Font f = new Font("新宋体", 8, FontStyle.Bold); //Image Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { //绘制坐标轴线 g.DrawLine(pen, P0, Px); g.DrawLine(pen, P0, Py); //箭头 g.DrawLine(pen, Py, Py1); g.DrawLine(pen, Py, Py2); g.DrawLine(pen, Px, Px1); g.DrawLine(pen, Px, Px2); //X for (int i = 1; i <= XCount; i++) { Point pl1 = new Point(P0.X + i * XDistance, P0.Y); Point pl2 = new Point(P0.X + i * XDistance, P0.Y - len); string str = ItemName[i - 1]; Point ps = new Point(pl1.X - (str.Length * 8), pl1.Y + 5); g.DrawLine(pen, pl1, pl2); g.DrawString(str, f, new SolidBrush(Color.Black), ps); } //Y for (int i = 1; i <= YCount; i++) { Point pl1 = new Point(P0.X, P0.Y - YDistance * i); Point pl2 = new Point(pl1.X + len, pl1.Y); string str = YValue[i - 1].ToString(); Point ps = new Point(pl1.X - str.Length * 8, pl1.Y - 5); g.DrawLine(pen, pl1, pl2); g.DrawString(str, f, new SolidBrush(Color.Black), ps); } //0 g.DrawString("0", f, new SolidBrush(Color.Black), new Point(P0.X - 10, P0.Y - 10)); //return return image; } finally { g.Dispose(); } } /// <summary> /// 绘制多组数据的曲线图 /// </summary> /// <param name="Title">主标题</param> /// <param name="ItemName">数据项名称</param> /// <param name="ItemValues">多组数据集合</param> /// <param name="ItemsName">各组的名称</param> /// <returns></returns> public static Bitmap GetMulLineImage(string Title, string[] ItemName, decimal[][] ItemValues, string[] ItemsName) { Bitmap image = GenerateImage(Title); image = DrawCoordinate(image, ItemName, ItemValues); Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { //绘制多条线 for (int m = 0; m < ItemsName.Length; m++) { int PNum = ItemName.Length; Point[] Pts = new Point[PNum]; //坐标轴 Point P0 = new Point(60, 360); Point Px = new Point(420, 360); Point Py = new Point(60, 65); //color Color c = GetRandomColor(m); Pen pen = new Pen(c); // int XCount = ItemName.Length;//X轴点的数量 int XDistance = Convert.ToInt32(350 / XCount);//X轴点间的距离 //图例 Rectangle RDes = new Rectangle(445, 90, 10, 10); Font f = new Font("新宋体", 9, FontStyle.Bold); // for (int i = 0; i < PNum; i++) { int x = P0.X + (i + 1) * XDistance; int y = GetCoordinateValue(ItemValues[m][i], ItemValues); Pts[i] = new Point(x, y); } //把点连起来 for (int i = 1; i < PNum; i++) { g.DrawLine(pen, Pts[i - 1], Pts[i]); } //画图例说明 DrawDes(image, RDes, c, ItemsName[m], f, m); } //return return image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
十一、绘制弧形曲线图
#region 绘制弧形曲线图 /// <summary> /// 绘制弧形曲线图(主要是分析不同类型的数值所占比例)，参数有图的标题，项目名称，项目的数值，名称和数值都是长度对应的 /// </summary> /// <param name="Title">图的标题</param> /// <param name="ItemName">项目名称</param> /// <param name="ItemValue">项目的数值</param> /// <returns>Bitmap图形</returns> public static Bitmap GetCurveImage(string Title, string[] ItemName, decimal[] ItemValue) { Bitmap image = GenerateImage(Title); image = DrawCoordinate(image, ItemName, ItemValue); Graphics g = Graphics.FromImage(image); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; try { int PNum = ItemName.Length; Point[] Pts = new Point[PNum]; //坐标轴 Point P0 = new Point(60, 360); Point Px = new Point(420, 360); Point Py = new Point(60, 65); Pen pen = new Pen(Color.Black); // int XCount = ItemName.Length;//X轴点的数量 int XDistance = Convert.ToInt32(350 / XCount);//X轴点间的距离 //图例 Rectangle RDes = new Rectangle(445, 90, 10, 10); Font f = new Font("新宋体", 9, FontStyle.Bold); // for (int i = 0; i < PNum; i++) { int x = P0.X + (i + 1) * XDistance; int y = GetCoordinateValue(ItemValue[i], ItemValue); Pts[i] = new Point(x, y); } //把点连起来 for (int i = 1; i < PNum; i++) { g.DrawBezier(pen, 10, 10, 40, 20, 80, 150, 100, 10); //g.DrawArc(pen, 0, 0, 140, 70, 0, 120); } //画图例说明 Color c = GetRandomColor(3); for (int i = 0; i < PNum; i++) { string str = ItemName[i] + ":" + ItemValue[i].ToString(); DrawDes(image, RDes, c, str, f, i); } //return return image; } finally { g.Dispose(); } } #endregion-----------------------------------------------------------------------------------------------------------------------------------------------------------
OK，以上操作完成，我们的GDI+公共类就完成了，接下来我们就看下如何调用和调用之后的效果图...
首先建一个窗体，在窗体中放入一个Panel容器，我们给它取名叫show_img，然后在窗体Load事件中添加以下代码：
string Title = "统计信息"; string[] ItemName = { "请问", "为我", "冗余", "三国", "锁定", "请问", "为我", "冗余", "三国", "锁定" };// decimal[] ItemValue = { 200, 40, 30, 20, 1, 60, 50, 20, 28, 48 };// decimal[][] ItemValues = { new decimal[]{52,11,23}, new decimal[]{5,21,3,34} };一、柱形图
show_img.BackgroundImage = ComFuctions.GetColumnImage(Title, ItemName, ItemValue);
如图：
-----------------------------------------------------------------------------------------------------------------------------------------------------------
二、曲线图
show_img.BackgroundImage = ComFuctions.GetLineImage(Title, ItemName, ItemValue);
如图：
-----------------------------------------------------------------------------------------------------------------------------------------------------------
三、饼状图
show_img.BackgroundImage = ComFuctions.GetPieImage(Title, ItemName, ItemValue);
如图：
-----------------------------------------------------------------------------------------------------------------------------------------------------------
四、交错数组数据的曲线图
show_img.BackgroundImage = ComFuctions.GetMulLineImage(Title, ItemName, ItemValues, ItemName);
如图：
-----------------------------------------------------------------------------------------------------------------------------------------------------------
五、弧形曲线图
show_img.BackgroundImage = ComFuctions.GetCurveImage(Title, ItemName, ItemValue);
如图：
-----------------------------------------------------------------------------------------------------------------------------------------------------------
OK，到这就结束了，这个GDI+的运用就完成了...
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