1、C# 绘制统计图柱状图 折线图 扇形图C# 绘制统计图(柱状图, 折线图, 扇形图)统计图形种类繁多, 有柱状图, 折线图, 扇形图等等, 而统计图形的绘制方法也有很多, 有Flash制作的统计图形, 有水晶报表生成统计图形, 有专门制图软件制作, 也有编程语言自己制作的；这里我们用就C# 制作三款最经典的统计图: 柱状图, 折线图和扇形图；既然是统计, 当然需要数据, 这里演示的数据存于Sql Server2000中, 三款统计图形都是动态生成. 其中柱状图我会附上制作步骤, 其他两款统计图直接附源码. 说明: 需求不一样, 统计图形绘制后的显示效果也不一样, 比如这里柱状图的主要需求是为了
2、比较每一期报名人数与通过人数的差, 因此会把两根柱子放在一起会使比较结果一目了然. 因此大家可以根据需要灵活绘制. 一. 柱状图的绘制.绘制步骤如下:1. 定义绘图用到的类.int height= 500, width= 700;Bitmap image= new Bitmap(width, height);Graphics g= Graphics.FromImage(image);Pen mypen= new Pen(brush,1); 2. 绘制图框.g.FillRectangle(Brushes.WhiteSmoke,0,0, width, height); 3. 绘制横向坐标线for
3、(int i= 0; i 14; i+) g.DrawLine(mypen, x,80, x,340);x= x+ 40; 4. 绘制纵向坐标线for (int i= 0; i 9; i+) g.DrawLine(mypen,60, y,620, y);y= y+ 26; 5. 绘制横坐标值String n= 第一期,第二期,第三期,第四期,全年 ;for (int i= 0; i 7; i+) g.DrawString(ni.ToString(), font, Brushes.Blue, x,348); x= x+ 78; 6. 绘制纵坐标值String m= 250,225,200,175
4、,150,125,100“;for (int i= 0; i 10; i+) g.DrawString(mi.ToString(), font, Brushes.Blue,25, y);y= y+ 26; 7. 定义数组存储数据库中统计的数据int Count1= new int7;/存储从数据库读取的报名人数int Count2= new int7;/存储从数据库读取的通过人数 8. 从数据库中读取报名人数与通过人数SqlConnection Con= new SqlConnection(Server=(Local);Database=committeeTraining;);Con.Open
5、();string cmdtxt2= SELECT * FROM #Countwhere Company= + *+ ;SqlDataAdapter da= new SqlDataAdapter(cmdtxt2, Con);DataSet ds= new DataSet();da.Fill(ds); 9. 将读取的数据存储到数组中Count10= Convert.ToInt32(ds.Tables0.Rows0“count1”.ToString(); Count11= Convert.ToInt32(ds.Tables0.Rows0“count3”.ToString(); Count20= C
6、onvert.ToInt32(ds.Tables0.Rows0“count2”.ToString(); Count21= Convert.ToInt32(ds.Tables0.Rows0count4.ToString(); 10.定义画笔和画刷准备绘图x= 80; Font font2= new System.Drawing.Font(Arial,10, FontStyle.Bold);SolidBrush mybrush= new SolidBrush(Color.Red);SolidBrush mybrush2= new SolidBrush(Color.Green); 11. 根据数组中
7、的值绘制柱状图 (1)第一期报名人数g.FillRectangle(mybrush, x,340 - Count10,20, Count10);g.DrawString(Count10.ToString(), font2, Brushes.Red, x,340 - Count10- 15);(2) 第一期通过人数x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count20,20, Count20);g.DrawString(Count20.ToString(), font2, Brushes.Green, x,340 - Count20- 15); 12
8、. 将图形输出到页面.System.IO.MemoryStream ms= new System.IO.MemoryStream();image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);Response.ClearContent();Response.ContentType= image/Jpeg;Response.BinaryWrite(ms.ToArray(); 最终柱状图的效果图: 柱状图的完整代码:private void CreateImage()int height= 500, width= 700;Bitmap imag
9、e= new Bitmap(width, height);/创建Graphics类对象Graphics g= Graphics.FromImage(image);try/清空图片背景色g.Clear(Color.White);Font font= new Font(Arial,10, FontStyle.Regular);Font font1= new Font(宋体,20, FontStyle.Bold);LinearGradientBrush brush= new LinearGradientBrush(new Rectangle(0,0, image.Width, image.Heigh
10、t), Color.Blue, Color.BlueViolet,1.2f,true);g.FillRectangle(Brushes.WhiteSmoke,0,0, width, height);/ Brush brush1 = new SolidBrush(Color.Blue);g.DrawString(this.ddlTaget.SelectedItem.Text+ + this.ddlYear.SelectedItem.Text+ 成绩统计柱状图, font1, brush,new PointF(70,30);/画图片的边框线g.DrawRectangle(new Pen(Color
11、.Blue),0,0, image.Width- 1, image.Height- 1);Pen mypen= new Pen(brush,1);/绘制线条/绘制横向线条int x= 100;for (int i= 0; i 14; i+)g.DrawLine(mypen, x,80, x,340);x= x+ 40;Pen mypen1= new Pen(Color.Blue,2);x= 60;g.DrawLine(mypen1, x,80, x,340);/绘制纵向线条int y= 106;for (int i= 0; i 9; i+)g.DrawLine(mypen,60, y,620,
12、 y);y= y+ 26;g.DrawLine(mypen1,60, y,620, y);/x轴String n= 第一期,第二期,第三期,第四期,上半年,下半年,全年统计 ;x= 78;for (int i= 0; i 7; i+)g.DrawString(ni.ToString(), font, Brushes.Blue, x,348);/设置文字内容及输出位置x= x+ 78;/y轴String m= 250,225,200,175,150,125,100, 75, 50, 25, 0;y= 72;for (int i= 0; i 10; i+)g.DrawString(mi.ToStr
13、ing(), font, Brushes.Blue,25, y);/设置文字内容及输出位置y= y+ 26;int Count1= new int7;int Count2= new int7;SqlConnection Con= new SqlConnection(Server=(Local);Database=committeeTraining;Uid=sa;Pwd=*);Con.Open();string cmdtxt2= SELECT * FROM #Count where Company= + this.ddlTaget.SelectedItem.Text.Trim()+ ;SqlDa
14、taAdapter da= new SqlDataAdapter(cmdtxt2, Con);DataSet ds= new DataSet();da.Fill(ds);Count10= Convert.ToInt32(ds.Tables0.Rows0count1.ToString();Count11= Convert.ToInt32(ds.Tables0.Rows0count3.ToString();Count12= Convert.ToInt32(ds.Tables0.Rows0count5.ToString();Count13= Convert.ToInt32(ds.Tables0.Ro
15、ws0count7.ToString();Count14= Count10+ Count11;Count15= Count12+ Count13;Count16= Convert.ToInt32(ds.Tables0.Rows0count9.ToString();Count20= Convert.ToInt32(ds.Tables0.Rows0count2.ToString();Count21= Convert.ToInt32(ds.Tables0.Rows0count4.ToString();Count22= Convert.ToInt32(ds.Tables0.Rows0count6.To
16、String();Count23= Convert.ToInt32(ds.Tables0.Rows0count8.ToString();Count24= Count20+ Count21;Count25= Count22+ Count23;Count26= Convert.ToInt32(ds.Tables0.Rows0count10.ToString();/绘制柱状图.x= 80;Font font2= new System.Drawing.Font(Arial,10, FontStyle.Bold);SolidBrush mybrush= new SolidBrush(Color.Red)
17、;SolidBrush mybrush2= new SolidBrush(Color.Green);/第一期g.FillRectangle(mybrush, x,340 - Count10,20, Count10);g.DrawString(Count10.ToString(), font2, Brushes.Red, x,340 - Count10- 15);x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count20,20, Count20);g.DrawString(Count20.ToString(), font2, Brushes.Green,
18、 x,340 - Count20- 15);/第二期x= x+ 60;g.FillRectangle(mybrush, x,340 - Count11,20, Count11);g.DrawString(Count11.ToString(), font2, Brushes.Red, x,340 - Count11- 15);x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count21,20, Count21);g.DrawString(Count21.ToString(), font2, Brushes.Green, x,340 - Count21- 1
19、5);/第三期x= x+ 60;g.FillRectangle(mybrush, x,340 - Count12,20, Count12);g.DrawString(Count12.ToString(), font2, Brushes.Red, x,340 - Count12- 15);x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count22,20, Count22);g.DrawString(Count22.ToString(), font2, Brushes.Green, x,340 - Count22- 15);/第四期x= x+ 60;g.F
20、illRectangle(mybrush, x,340 - Count13,20, Count13);g.DrawString(Count13.ToString(), font2, Brushes.Red, x,340 - Count13- 15);x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count23,20, Count23);g.DrawString(Count23.ToString(), font2, Brushes.Green, x,340 - Count23- 15);/上半年x= x+ 60;g.FillRectangle(mybrus
21、h, x,340 - Count14,20, Count14);g.DrawString(Count14.ToString(), font2, Brushes.Red, x,340 - Count14- 15);x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count24,20, Count24);g.DrawString(Count24.ToString(), font2, Brushes.Green, x,340 - Count24- 15);/下半年x= x+ 60;g.FillRectangle(mybrush, x,340 - Count15,
22、20, Count15);g.DrawString(Count15.ToString(), font2, Brushes.Red, x,340 - Count15- 15);x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count25,20, Count25);g.DrawString(Count25.ToString(), font2, Brushes.Green, x,340 - Count25- 15);/全年x= x+ 60;g.FillRectangle(mybrush, x,340 - Count16,20, Count16);g.DrawS
23、tring(Count16.ToString(), font2, Brushes.Red, x,340 - Count16- 15);x= x+ 20;g.FillRectangle(mybrush2, x,340 - Count26,20, Count26);g.DrawString(Count26.ToString(), font2, Brushes.Green, x,340 - Count26- 15);/绘制标识Font font3= new System.Drawing.Font(Arial,10, FontStyle.Regular);g.DrawRectangle(new Pen
24、(Brushes.Blue),170,400,250,50);/绘制范围框g.FillRectangle(Brushes.Red,270,410,20,10);/绘制小矩形g.DrawString(报名人数, font3, Brushes.Red,292,408);g.FillRectangle(Brushes.Green,270,430,20,10);g.DrawString(通过人数, font3, Brushes.Green,292,428);System.IO.MemoryStream ms= new System.IO.MemoryStream();image.Save(ms, Sy
25、stem.Drawing.Imaging.ImageFormat.Jpeg);Response.ClearContent();Response.ContentType= image/Jpeg;Response.BinaryWrite(ms.ToArray();finallyg.Dispose();image.Dispose(); 二. 折线统计图的绘制效果: 折线图的完整代码:private void CreateImage()int height= 480, width= 700;Bitmap image= new Bitmap(width, height);Graphics g= Grap
26、hics.FromImage(image);try/清空图片背景色g.Clear(Color.White);Font font= new System.Drawing.Font(Arial,9, FontStyle.Regular);Font font1= new System.Drawing.Font(宋体,20, FontStyle.Regular);Font font2= new System.Drawing.Font(Arial,8, FontStyle.Regular);LinearGradientBrush brush= new LinearGradientBrush(new Re
27、ctangle(0,0, image.Width, image.Height), Color.Blue, Color.Blue,1.2f,true);g.FillRectangle(Brushes.AliceBlue,0,0, width, height);Brush brush1= new SolidBrush(Color.Blue);Brush brush2= new SolidBrush(Color.SaddleBrown);g.DrawString(this.ddlTaget.SelectedItem.Text+ + this.ddlYear.SelectedItem.Text+ 成绩
28、统计折线图, font1, brush1,new PointF(85,30);/画图片的边框线g.DrawRectangle(new Pen(Color.Blue),0,0, image.Width- 1, image.Height- 1);Pen mypen= new Pen(brush,1);Pen mypen2= new Pen(Color.Red,2);/绘制线条/绘制纵向线条int x= 60;for (int i= 0; i 8; i+)g.DrawLine(mypen, x,80, x,340);x= x+ 80;Pen mypen1= new Pen(Color.Blue,3);x= 60;g.DrawLine(mypen1, x,82, x,340);/绘制横向线条int y= 106;for (int i= 0; i 10; i+)g.DrawLine(mypen,60, y,620, y);y= y+ 26;/ y = 106;g.DrawLine(mypen1,60, y- 26,620, y- 26);/x轴String n= 第一期,第二期,第三期,第四期,上半年,下半年,全年统计 ;x= 45;for (int
