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
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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
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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
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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
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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
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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
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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
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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
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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
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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...