asp.net 繪製曲線圖首先定義DrawClass類
using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.Drawing;using System.IO;
/// <summary>
/// DrawClass 的摘要說明
/// </summary>public class DrawClass{ public DrawClass()
{
// // TODO: 在此處添加構造函數邏輯 //
} public MemoryStream draw(DataSet ds, int Tnum) { //取得記錄數量 int count = ds.Tables[0].Rows.Count; //記算圖表寬度 int wd = 80 + 20 * (count - 1); //設置最小寬度爲800 if (wd < 800) wd = 800; //生成Bitmap對像 Bitmap img = new Bitmap(wd, 400); //生成繪圖對像 Graphics g = Graphics.FromImage(img); //定義黑色畫筆 Pen Bp = new Pen(Color.Black); //定義紅色畫筆 Pen Rp = new Pen(Color.Red); //定義銀灰色畫筆 Pen Sp = new Pen(Color.Silver); //定義大標題字體 Font Bfont = new Font("Arial", 12, FontStyle.Bold); //定義一般字體 Font font = new Font("Arial", 6); //定義大點的字體 Font Tfont = new Font("Arial", 9); //繪製底色 g.DrawRectangle(new Pen(Color.White, 400), 0, 0, img.Width, img.Height); //定義黑色過渡型筆刷 LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Black, Color.Black, 1.2F, true); //定義藍色過渡型筆刷 LinearGradientBrush Bluebrush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Blue, Color.Blue, 1.2F, true); //繪製大標題 g.DrawString(ds.Tables[0].Rows[0]["sendid"].ToString() + "號訂單發送情況曲線圖", Bfont, brush, 40, 5); //取得當前發送量 int nums = 0; for (int i = 0; i < count; i++) { nums += Convert.ToInt32(ds.Tables[0].Rows[i]["sendmum"]); } //繪製信息簡報 string info = "訂單發送時間：" + ds.Tables[0].Rows[0]["sendtime"].ToString() + " 曲線圖生成時間：" + DateTime.Now.ToString() + " 訂單總量：" + Tnum.ToString() + " 當前發送總量：" + nums.ToString(); g.DrawString(info, Tfont, Bluebrush, 40, 25); //繪製圖片邊框 g.DrawRectangle(Bp, 0, 0, img.Width - 1, img.Height - 1); //繪製豎座標線 for (int i = 0; i < count; i++) { g.DrawLine(Sp, 40 + 20 * i, 60, 40 + 20 * i, 360); } //繪製時間軸座標標籤 for (int i = 0; i < count; i += 2) { string st = Convert.ToDateTime(ds.Tables[0].Rows[i]["sendtime"]).ToString("hh:mm"); g.DrawString(st, font, brush, 30 + 20 * i, 370); } //繪製橫座標線 for (int i = 0; i < 10; i++) { g.DrawLine(Sp, 40, 60 + 30 * i, 40 + 20 * (count - 1), 60 + 30 * i); int s = 2500 - 50 * i * 5; //繪製發送量軸座標標籤 g.DrawString(s.ToString(), font, brush, 10, 60 + 30 * i); } //繪製豎座標軸 g.DrawLine(Bp, 40, 55, 40, 360); //繪製橫座標軸 g.DrawLine(Bp, 40, 360, 45 + 20 * (count - 1), 360); //定義曲線轉折點 Point[] p = new Point[count]; for (int i = 0; i < count; i++) { p[i].X = 40 + 20 * i; p[i].Y = 360 - Convert.ToInt32(ds.Tables[0].Rows[i]["sendmum"]) / 5 * 3 / 5; } //繪製發送曲線 g.DrawLines(Rp, p); for (int i = 0; i < count; i++) { //繪製發送記錄點的發送量 g.DrawString(ds.Tables[0].Rows[i]["sendmum"].ToString(), font, Bluebrush, p[i].X, p[i].Y - 10); //繪製發送記錄點 g.DrawRectangle(Rp, p[i].X - 1, p[i].Y - 1, 2, 2); } //繪製豎座標標題 g.DrawString("發送量", Tfont, brush, 5, 40); //繪製橫座標標題 g.DrawString("發送時間", Tfont, brush, 40, 385); //保存繪製的圖片 MemoryStream stream = new MemoryStream(); img.Save(stream, ImageFormat.Jpeg); return stream; }}
然後在頁面文件中調用輸出
DrawClass dc = new DrawClass(); OracleConnection conn = new OracleConnection(con); string sql = "select * from atest"; OracleDataAdapter da = new OracleDataAdapter(sql, conn); DataSet ds = new DataSet(); da.Fill(ds, "atest"); MemoryStream ss=dc.draw(ds, 6); Response.ContentType = "image/jpeg"; Response.BinaryWrite(ss.ToArray());圖片輸出到page頁面中也有另外一種方式
FileStream fs = new FileStream(@"c:Curve.jpg", FileMode.Open, FileAccess.Read); byte[] mydata = new byte[fs.Length]; int Length = Convert.ToInt32(fs.Length); fs.Read(mydata, 0, Length); fs.Close(); this.Response.OutputStream.Write(mydata, 0, Length); this.Response.End();
這樣就行了。