c#中连接数据库后绘制柱状图和饼状图

自己在项目中使用的绘制柱状图和饼状图的方法

简单实用，可直接调用

public class GongNeng

{

System.Data.DataTable table1 = new System.Data.DataTable();

public GongNeng()

{

}

//定义绘制饼状图的颜色

public static Color GetChartItemColor(int itemIndex)

{

Color selectedColor;

switch(itemIndex)

{

case 0:

selectedColor = Color.Blue;

break;

case 1:

selectedColor = Color.Red;

break;

case 2:

selectedColor = Color.Yellow;

break;

case 3:

selectedColor = Color.Brown;

break;

default:

selectedColor = Color.Green;

break;

}

return selectedColor;

}

//绘制柱状图

public System.Drawing.Image DrawZhuTu(string time1,string time2,string ky, string sql2)

{

//获取相关数据

LData ld = new LData();

SqlDataReader dr = null;

//dr = ld.exeDataReader(sql1);

//int max = 0;

//int min = 0;

//while (dr.Read())

//{

// max = Convert.ToInt32(dr[0].ToString());

// min = Convert.ToInt32(dr[1].ToString());

//}

//dr.Close();

System.Data.DataTable table1 = new System.Data.DataTable();

table1 = ld.exeDataSet(sql2).Tables[0];

ld.close();

int rowNum = table1.Rows.Count;

int[] ShuZhi = new int[rowNum];

//string[] RQ_Year = new string[rowNum];

//string[] RQ_Day = new string[rowNum];

//string[] RQ_Yue = new string[rowNum];

string[] XueYuan = new string[rowNum];

for (int i = 0; i < rowNum; i++)

{

//RQ_Year[i] = Convert.ToDateTime(table1.Rows[i][0].ToString()).Year.ToString();//获取横坐标的时间

//RQ_Yue[i] = Convert.ToDateTime(table1.Rows[i][0].ToString()).Month.ToString();

//RQ_Day[i] = Convert.ToDateTime(table1.Rows[i][0].ToString()).Day.ToString();

ShuZhi[i] = Convert.ToInt32(table1.Rows[i][1].ToString());

XueYuan[i] = table1.Rows[i][0].ToString();

}

ld.close();

//开始绘制图线

int height = 450, width = 800;

System.Drawing.Bitmap image = new System.Drawing.Bitmap(width, height);

//创建Graphics类对象

Graphics g = Graphics.FromImage(image);

//清空图片背景色

g.Clear(Color.White);

System.Drawing.Font font = new System.Drawing.Font("Arial", 9, FontStyle.Regular);

System.Drawing.Font font1 = new System.Drawing.Font("宋体", 16, FontStyle.Regular);

System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new System.Drawing.Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Blue, 1.2f, true);

g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);

Brush brush1 = new SolidBrush(Color.Blue);

//画图片的边框线

g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 4, image.Height - 4);

Pen mypen = new Pen(brush, 1);

//绘制线条

//绘制纵向线条

int x = 80;

for (int i = 0; i < 15; i++)

{

g.DrawLine(mypen, x, 80, x, 380);

x = x + 40;

}

Pen mypen1 = new Pen(Color.Blue, 2);

g.DrawLine(mypen1, 80, 80, 80, 380);

//绘制横向线条

int y = 80;

for (int i = 0; i < 10; i++)

{

g.DrawLine(mypen, 80, y, 680, y);

y = y + 30;

}

g.DrawLine(mypen1, 80, y, 680, y);

//标题

string Title = time1 + " 到 " + time2 + "各个学院的" + ky + "科研数量比例图";

g.DrawString(Title, font1, Brushes.Blue, 50, 25);

//y轴数值

int[] Y_zhi ={ 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 };

y = 370;

for (int i = 0; i < 11; i++)

{

g.DrawString(Y_zhi[i].ToString(), font, Brushes.Red, 50, y);

y = y - 30;

}

//x轴数值

x = 105;

for (int i = 0; i < rowNum; i++)

{

Char[] ch = XueYuan[i].ToString().ToCharArray();

String str1 = ch[0].ToString() + ch[1].ToString();

string str2 = ch[2].ToString() + ch[3].ToString();

//g.DrawString(RQ_Year[i].ToString(), font, Brushes.Red, x, 380);

//g.DrawString("年", font, Brushes.Red, x, 395);

//g.DrawString(RQ_Yue[i].ToString(), font, Brushes.Red, x, 410);

//g.DrawString("月", font, Brushes.Red, x, 425);

//g.DrawString(RQ_Day[i].ToString(), font, Brushes.Red, x, 440);

//g.DrawString("日", font, Brushes.Red, x, 455);

g.DrawString(str1, font, Brushes.Red, x, 380);

g.DrawString(str2, font, Brushes.Red, x, 395);

x = x + 40;

}

g.DrawString("学院", font1, Brushes.Blue, 350, 425);

//显示柱状效果

int[] X_zhi = new int[rowNum];

for (int i = 0; i < rowNum; i++)

{

X_zhi[i] = (ShuZhi[i] - 0) * 30 / 10;

}

x = 110;

for (int i = 0; i < rowNum; i++)

{

SolidBrush mybrush = new SolidBrush(Color.Red);

g.FillRectangle(mybrush, x, 380 - X_zhi[i], 20, X_zhi[i]);

x = x + 40;

}

return image;

}

//绘制饼状图

public System.Drawing.Image DrawBingTu(string sql1,string time1,string time2,string XueYuan)

{

int height = 400, width = 800;

System.Drawing.Bitmap image = new System.Drawing.Bitmap(width, height);

//创建Graphics类对象

Graphics g = Graphics.FromImage(image);

//清空图片背景色

g.Clear(Color.White);

System.Drawing.Font font = new System.Drawing.Font("Arial", 9, FontStyle.Regular);

System.Drawing.Font font1 = new System.Drawing.Font("宋体", 16, FontStyle.Regular);

System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new System.Drawing.Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Blue, 1.2f, true);

g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);

Brush brush1 = new SolidBrush(Color.Blue);

//画图片的边框线

g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 4, image.Height - 4);

Pen mypen = new Pen(brush, 1);

//饼图标题

string Title = time1 + "到" + time2 +"间"+ XueYuan + "四类科研项目数量比例图";

g.DrawString(Title, font1, Brushes.Blue, 70, 20);

//获取数据用来绘制比例

System.Data.DataTable table = new System.Data.DataTable();

LData ld=new LData();

table = ld.exeDataSet(sql1).Tables[0];

float sumData = 0;

for (int i = 0; i < table.Rows.Count; i++) {

sumData += Convert.ToSingle(table.Rows[i][1]);

}

float curAngle = 0;

float totalAngle = 0;

for (int i = 0; i < table.Rows.Count; i++)

{

curAngle = Convert.ToSingle(table.Rows[i][1]) / sumData * 360;

g.FillPie(new SolidBrush(GetChartItemColor(i)), 100, 65, 200, 200, totalAngle, curAngle);

g.DrawPie(Pens.Black, 100, 65, 200, 200, totalAngle, curAngle);

totalAngle += curAngle;

}

g.DrawRectangle(Pens.Black,250,300,250,90);

g.DrawString("图表说明", new System.Drawing.Font("Tahoma", 12, FontStyle.Bold), Brushes.Black, new PointF(260, 300));

//画图例各项

PointF boxOrigin = new PointF(260,330);

PointF textOrigin = new PointF(280,326);

float percent = 0;

for (int i = 0; i < table.Rows.Count; i++)

{

g.FillRectangle(new SolidBrush(GetChartItemColor(i)),boxOrigin.X,boxOrigin.Y,20,10);

g.DrawRectangle(Pens.Black,boxOrigin.X,boxOrigin.Y,20,10);

percent = Convert.ToSingle(table.Rows[i][1]) / sumData * 100;

g.DrawString(table.Rows[i][1].ToString() + " - " + table.Rows[i][0].ToString() + " (" + percent.ToString("0") + "%)", new System.Drawing.Font("Tahoma", 10), Brushes.Black, textOrigin);

boxOrigin.Y += 15;

textOrigin.Y += 15;

}

return image;

}