C#中用GDI+生成饼状图和柱状图

using System;
using System.IO;//用于文件存取
using System.Data;//用于数据访问
using System.Drawing;//提供画GDI+图形的基本功能
using System.Drawing.Text;//提供画GDI+图形的高级功能
using System.Drawing.Drawing2D;//提供画高级二维，矢量图形功能
using System.Drawing.Imaging;//提供画GDI+图形的高级功能
namespace lc.laili.Web.Code
{
/// <summary>
/// MyImage 的摘要说明。
/// </summary>
public class MyImage
{
public MyImage()
{
//
// TODO: 在此处添加构造函数逻辑
//

}

/// <summary>
/// 数据源是PieChartValue对象的饼状图
/// </summary>
/// <param name="title">饼状图大标题</param>
/// <param name="subTitle">饼状图小标题</param>
/// <param name="width">图宽</param>
/// <param name="height">图高</param>
/// <param name="Mydata">PieChartValue对象</param>
/// <returns>饼状图路径</returns>
public string Render(string title, string subTitle, int width, int height, PieChartValue[] Mydata)
{
const int SIDE_LENGTH = 400;
const int PIE_DIAMETER = 200;
//DataTable dt = DataTable;

//通过输入参数，取得饼图中的总基数
float sumData = 0;
for (int i = 0; i < Mydata.Length; i++)
{
sumData += Convert.ToSingle(Mydata[i].MValue);
}
//产生一个image对象，并由此产生一个Graphics对象
Bitmap bm = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bm);
//设置对象g的属性
g.ScaleTransform((Convert.ToSingle(width)) / SIDE_LENGTH, (Convert.ToSingle(height)) / SIDE_LENGTH);
g.SmoothingMode = SmoothingMode.Default;
g.TextRenderingHint = TextRenderingHint.AntiAlias;

//画布和边的设定
g.Clear(Color.White);
g.DrawRectangle(Pens.Black, 0, 0, SIDE_LENGTH - 1, SIDE_LENGTH - 1);
//画饼图标题
g.DrawString(title, new Font("Tahoma", 14), Brushes.Black, new PointF(5, 5));
//画饼图的图例
g.DrawString(subTitle, new Font("Tahoma", 12), Brushes.Black, new PointF(7, 35));
//画饼图
float curAngle = 0;
float totalAngle = 0;
for (int j = 0; j < Mydata.Length; j++)
{
curAngle = Convert.ToSingle(Mydata[j].MValue) / sumData * 360;

g.FillPie(new SolidBrush(ChartUtil.GetChartItemColor(j)), 100, 65, PIE_DIAMETER, PIE_DIAMETER, totalAngle, curAngle);
g.DrawPie(Pens.Black, 100, 65, PIE_DIAMETER, PIE_DIAMETER, totalAngle, curAngle);
totalAngle += curAngle;
}
//画图例框及其文字
g.DrawRectangle(Pens.Black, 200, 300, 199, 99);
g.DrawString("图表说明", new Font("Tahoma", 12, FontStyle.Bold), Brushes.Black, new PointF(200, 300));

//画图例各项
PointF boxOrigin = new PointF(210, 330);
PointF textOrigin = new PointF(235, 326);
float percent = 0;
for (int k = 0; k < Mydata.Length; k++)
{
g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(k)), boxOrigin.X, boxOrigin.Y, 20, 10);
g.DrawRectangle(Pens.Black, boxOrigin.X, boxOrigin.Y, 20, 10);
percent = Convert.ToSingle(Mydata[k].MValue) / sumData * 100;
g.DrawString(Mydata[k].MValue.ToString() + " - " + Mydata[k].Name.ToString() + " (" + percent.ToString("0") + "%)", new Font("Tahoma", 10), Brushes.Black, textOrigin);
boxOrigin.Y += 15;
textOrigin.Y += 15;
}
//回收资源
g.Dispose();
//此处存储路径需要自己改
System.Drawing.Image MyImage=(System.Drawing.Image)bm;
string TruePath= System.Web.HttpContext.Current.Server.MapPath("~/images");
string TrueName=DateTime.Now.ToString("yyyyMMddhhmmss")+DateTime.Now.Millisecond;
MyImage.Save(TruePath+"\\"+TrueName+".jpg", System.Drawing.Imaging.ImageFormat.Gif);
return "~/images/"+TrueName+".jpg";
}

/// <summary>
/// 数据源是BarChartValue对象的柱状图
/// </summary>
/// <param name="title">大标题</param>
/// <param name="subTitle">小标题</param>
/// <param name="width">图宽</param>
/// <param name="height">图高</param>
/// <param name="Mydata">BarChartValue对象</param>
/// <returns>柱状图路径</returns>
public string Render(string title, string subTitle, int width, int height, BarChartValue[] Mydata)
{
const int SIDE_LENGTH = 400;
const int CHART_TOP = 75;
const int CHART_HEIGHT = 200;
const int CHART_LEFT = 50;
const int CHART_WIDTH = 300;

//计算最高的点
float highPoint = 0;
for (int i=0; i < Mydata.Length;i++ )
{
if (highPoint < Convert.ToSingle(Mydata[i].MValue))
{
highPoint = Convert.ToSingle(Mydata[i].MValue);
}
}
//建立一个Graphics对象实例
Bitmap bm = new Bitmap(width, height);

Graphics g = Graphics.FromImage(bm);
//设置条图图形和文字属性
g.ScaleTransform((Convert.ToSingle(width)) / SIDE_LENGTH, (Convert.ToSingle(height)) / SIDE_LENGTH);
g.SmoothingMode = SmoothingMode.Default;
g.TextRenderingHint = TextRenderingHint.AntiAlias;

//设定画布和边
g.Clear(Color.White);
g.DrawRectangle(Pens.Black, 0, 0, SIDE_LENGTH - 1, SIDE_LENGTH - 1);
//画大标题
g.DrawString(title, new Font("Tahoma", 14), Brushes.Black, new PointF(5, 5));
//画小标题
g.DrawString(subTitle, new Font("Tahoma", 12), Brushes.Black, new PointF(7, 35));
//画条形图
float barWidth = CHART_WIDTH / (Mydata.Length * 2);
PointF barOrigin = new PointF(CHART_LEFT + (barWidth / 2), 0);
float barHeight = Mydata.Length;
for (int i = 0; i < Mydata.Length; i++)
{
barHeight = Convert.ToSingle(Mydata[i].MValue) * 200 / highPoint * 1;
barOrigin.Y = CHART_TOP + CHART_HEIGHT - barHeight;
g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)), barOrigin.X, barOrigin.Y, barWidth, barHeight);

g.DrawString(Mydata[i].Name, new Font("Tahoma", 3), Brushes.Black, new PointF(barOrigin.X-3, 277));

barOrigin.X = barOrigin.X + (barWidth * 2);
}
//设置边
g.DrawLine(new Pen(Color.Black, 2), new Point(CHART_LEFT, CHART_TOP), new Point(CHART_LEFT, CHART_TOP + CHART_HEIGHT));
g.DrawLine(new Pen(Color.Black, 2), new Point(CHART_LEFT, CHART_TOP + CHART_HEIGHT), new Point(CHART_LEFT + CHART_WIDTH, CHART_TOP + CHART_HEIGHT));
//画图例框和文字

//g.DrawRectangle(Pens.Black, 200, 300, 199, 99);
//g.DrawString("图表说明", new Font("Tahoma", 12, FontStyle.Bold), Brushes.Black, new PointF(200, 300));

g.DrawRectangle(new Pen(Color.Black, 1), 10, 290, 299, 110);
g.DrawString("图表说明", new Font("Tahoma", 10, FontStyle.Bold), Brushes.Black, new PointF(11, 290));

//画图例
PointF boxOrigin = new PointF(10, 310);
PointF textOrigin = new PointF(35, 306);
for (int i = 0; i < Mydata.Length; i++)
{
g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)), boxOrigin.X, boxOrigin.Y, 20, 10);
g.DrawRectangle(Pens.Black, boxOrigin.X, boxOrigin.Y, 2, 1);
g.DrawString(Mydata[i].Name.ToString() + " - " + Mydata[i].MValue.ToString(), new Font("Tahoma", 10), Brushes.Black, textOrigin);
if(i<5)
{
boxOrigin.Y += 15;
textOrigin.Y += 15;
}
else if(i==5)
{
boxOrigin.X = 150;
boxOrigin.Y = 310;
textOrigin.X = 176;
textOrigin.Y = 306;

}
else
{
boxOrigin.Y += 15;
textOrigin.Y += 15;
}

}
//输出图形
g.Dispose();
//此处存储路径需要自己改
System.Drawing.Image MyImage=(System.Drawing.Image)bm;
string TruePath= System.Web.HttpContext.Current.Server.MapPath("~/images");
string TrueName=DateTime.Now.ToString("yyyyMMddhhmmss")+DateTime.Now.Millisecond;
MyImage.Save(TruePath+"\\"+TrueName+".jpg", System.Drawing.Imaging.ImageFormat.Gif);
return "~/images/"+TrueName+".jpg";

}
}

/// <summary>
/// 选择颜色
/// </summary>
public class ChartUtil
{
public ChartUtil()
{
}
public static Color GetChartItemColor(int itemIndex)
{
Color selectedColor;
switch (itemIndex)
{
case 0:
selectedColor = Color.AliceBlue;
break;
case 1:
selectedColor = Color.Red;
break;
case 2:
selectedColor = Color.Yellow;
break;
case 3:
selectedColor = Color.AntiqueWhite;
break;
case 4:
selectedColor = Color.Aqua;
break;
case 5:
selectedColor = Color.Aquamarine;
break;
case 6:
selectedColor = Color.Azure;
break;
case 7:
selectedColor = Color.Beige;
break;
case 8:
selectedColor = Color.Black;
break;
case 9:
selectedColor = Color.Brown;
break;
case 10:
selectedColor = Color.Coral;
break;
case 11:
selectedColor = Color.DarkCyan;
break;
case 12:
selectedColor = Color.DarkOrange;
break;
default:
selectedColor = Color.DarkViolet;
break;
}
return selectedColor;
}
}

/// <summary>
/// 饼状图的数据对象
/// </summary>
public class PieChartValue
{
public PieChartValue()
{

}
public PieChartValue(string MyName, int Myvalue)
{
Name = MyName;
MValue = Myvalue;
}
private string name;
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}

private int mvalue;
public int MValue
{
get
{
return mvalue;
}
set
{
mvalue = value;
}
}
}

/// <summary>
/// 柱状图的数据对象
/// </summary>
public class BarChartValue
{
public BarChartValue()
{

}
public BarChartValue(string MyName, int Myvalue)
{
Name = MyName;
MValue = Myvalue;
}
private string name;
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}

private int mvalue;
public int MValue
{
get
{
return mvalue;
}
set
{
mvalue = value;
}
}
}
}

用法

#region 生成柱状图

MyImage MyMyImage = new MyImage();
BarChartValue[] BarChartValue ={
new BarChartValue("第1个月",5),
new BarChartValue("第2个月",2),
new BarChartValue("第3个月",3),
new BarChartValue("第4个月",4),
new BarChartValue("第5个月",5),
new BarChartValue("第6个月",6),
new BarChartValue("第7个月",7),
new BarChartValue("第8个月",8),
new BarChartValue("第9个月",9)

};
Image1.ImageUrl = MyMyImage.Render("全年统计", "98年", 1000, 1000, BarChartValue);
#endregion

#region 生成饼状图
PieChartValue[] PieChartValue ={
new PieChartValue("第一个仓库",1),
new PieChartValue("第一个仓库",2)
};

Image2.ImageUrl = MyMyImage.Render("仓库统计饼状图", "小仓库", 500, 500, PieChartValue);
#endregion