ASP.NET绘制折线图代码分享
ASP.NET中绘制折线图，转载，代码未经楼主测试/// <summary>
/// 获取数据
/// strChartName：图名称；
/// yName：纵坐标名称；
/// xName：横坐标名称；
/// iyMaxValue:纵坐标最大值；
/// dyAveValue:纵坐标单位值=（纵坐标最大值/标量30）
/// ----100 30 :3
/// ----200 30 :1.5；
/// xdbColumnName:横坐标绑定显示数据表值的列名；
/// ydbColumnName:纵坐标绑定显示数据表值得列名；
/// </summary>
public void Get_CurveData(string strSql,string strChartName,string yName,string xName,int iyMaxValue, double dyAveValue,string xdbColumnName,string ydbColumnName)
{
try
{
DataSet ds = sqlAccess.ReadFromDB(strSql);
draw(ds.Tables, strChartName, yName, xName, iyMaxValue, dyAveValue, xdbColumnName, ydbColumnName);
}
catch (Exception exp)
{
Response.Write(sqlAccess.ExceptionMessage);
}
}
public void draw(DataTable dt, string strChartName, string yName, string xName, int iyMaxValue, double dyAveValue, string xdbColumnName, string ydbColumnName)
{
//取得记录数量
int count = dt.Rows.Count;
//记算图表宽度
int wd = 80 + 20 * (count - 1);
//设置最小宽度为800
if (wd < 600) wd = 600;
//生成Bitmap对像
Bitmap img = new Bitmap(wd, 400);
//生成绘图对像
Graphics g = Graphics.FromImage(img);
//定义黑色画笔
Pen Bp = new Pen(Color.Black);
//定义红色画笔
Pen Rp = new Pen(Color.Red);
//定义银灰色画笔
Pen Sp = new Pen(Color.Silver);
//定义蓝色画笔
Pen Blp = new Pen(Color.Blue);
//定义大标题字体
Font Bfont = new Font("Arial", 12, FontStyle.Bold);
//定义一般字体
Font font = new Font("Arial", 9);
//定义大点的字体
Font Tfont = new Font("Arial", 9);
//定义横坐标间隔，(最佳值是总宽度-留空宽度[左右侧都需要])/(记录数量-1)
int xSpace = (wd - 100) / (count - 1);
//定义纵坐标间隔,不能随便修改，跟高度和横坐标线的条数有关，最佳值=(绘图的高度-上面留空-下面留空)
int ySpace = 30;
//纵坐标最大值和间隔值
int yMaxValue = iyMaxValue;
//绘制底色
g.DrawRectangle(new Pen(Color.White, 400), 0, 0, img.Width, img.Height);
//定义黑色过渡型笔刷
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Black, Color.Black, 1.2F, true);
//定义蓝色过渡型笔刷
LinearGradientBrush Bluebrush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Blue, Color.Blue, 1.2F, true);
//绘制大标题
g.DrawString(strChartName, Bfont, brush, 40, 5);
//绘制信息简报
//string info = " 曲线图生成时间：" + DateTime.Now.ToString();
//g.DrawString(info, Tfont, Bluebrush, 40, 25);
//绘制图片边框
g.DrawRectangle(Bp, 0, 0, img.Width - 1, img.Height - 1);
//绘制竖坐标轴
g.DrawLine(Bp, 40, 55, 40, 360);
//绘制横坐标轴 x2的60是右侧空出部分
g.DrawLine(Bp, 40, 360, 60 + xSpace * (count - 1), 360);
//绘制竖坐标标题
g.DrawString(yName, Tfont, brush, 5, 40);
//绘制横坐标标题
g.DrawString(xName, Tfont, brush, 40, 385);
//绘制竖坐标线
for (int i = 0; i < count; i++)
{
g.DrawLine(Sp, 40 + xSpace * i, 60, 40 + xSpace * i, 360);
}
//绘制时间轴坐标标签
for (int i = 0; i < count; i++)
{
//string st = Convert.ToDateTime(dt.Rows["testdate"]).ToString("MM:dd");
//string st = "第" + dt.Rows["testdate"].ToString() + "周";
string st = dt.Rows.ToString();
g.DrawString(st, font, brush, 30 + xSpace * i, 370);
}
//绘制横坐标线
for (int i = 0; i < 10; i++)
{
g.DrawLine(Sp, 40, 60 + ySpace * i, 40 + xSpace * (count - 1), 60 + ySpace * i);
//横坐标轴的值间隔是最大值除以间隔数
int s = yMaxValue - i * (yMaxValue / 10);
//绘制发送量轴坐标标签
g.DrawString(s.ToString(), font, brush, 10, 60 + ySpace * i);
}
//处理39.6%形式的数据
string[] strArr = new string;
for (int i = 0; i < count; i++)
{
string strValue = dt.Rows.ToString();
if (strValue.Contains("%"))
{
strArr = strValue.Split('%');
}
else
{
strArr = strValue;
}
}
//200/30
//定义纵坐标单位数值=纵坐标最大值/标量最大值
double yAveValue = dyAveValue;
//定义曲线转折点
Point[] p = new Point;
for (int i = 0; i < count; i++)
{
p.X = 40 + xSpace * i;
p.Y = 360 - Convert.ToInt32(Convert.ToDouble(strArr) * yAveValue);
}
//绘制折线图
//g.DrawLines(Rp, p);
//绘制曲线图
//g.DrawCurve(Rp, p);
//绘制自定义张力的曲线图（0.5F是张力值，默认就是这个值）
g.DrawCurve(Rp, p, 0.5F);
//g.DrawLines(Rp, p);
//当需要在一个图里绘制多条曲线的时候，就多定义个point数组，然后画出来就可以了。
for (int i = 0; i < count; i++)
{
//绘制发送记录点的发送量
g.DrawString(strArr, font, Bluebrush, p.X, p.Y - 10);
//绘制发送记录点
g.DrawRectangle(Rp, p.X - 1, p.Y - 1, 2, 2);
}
///*******************画中值线///
//for (int i = 0; i < count; i++)
//{
// p.X = 40 + xSpace * i;
// p.Y = 360 - Convert.ToInt32("50") * yAveValue;
//}
//for (int i = 0; i < count; i++)
//{
// //绘制发送记录点的发送量
// g.DrawString("", font, Bluebrush, p.X, p.Y - 10);
// //绘制发送记录点
// g.DrawRectangle(Rp, p.X - 1, p.Y - 1, 2, 2);
//}
//g.DrawLine(Blp, 40, 360 - Convert.ToInt32("50") * yAveValue, 60 + xSpace * (count - 1), 360 - Convert.ToInt32("50") * yAveValue);
///**************************///
//保存绘制的图片
MemoryStream stream = new MemoryStream();
img.Save(stream, ImageFormat.Jpeg);
//图片输出
Response.Clear();
Response.ContentType = "image/jpeg";
Response.BinaryWrite(stream.ToArray());
}
}
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