c# 曲线图生成代码

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Drawing; using System.Drawing.Drawing2D; using System.IO; using System.Drawing.Imaging; using System.Collections; namespace Curve { public class CurveDrawing { string title, title2, ytitle, xtitle; ///

/// X坐标的标题 ///

public string Xtitle { get { return xtitle; } set { xtitle = value; } } ///

/// Y坐标的标题 ///

public string Ytitle { get { return ytitle; } set { ytitle = value; } } ///

/// 副标题 ///

public string Title2 { get { return title2; } set { title2 = value; } } ///

/// 主标题 ///

public string Title { get { return title; } set { title = value; } } double yMax, yMin; List itemlist; public CurveDrawing(List itemlist, string title, string title2 = "") { this.itemlist = itemlist; this.title = title; this.title2 = title2; yMax = -100000000; yMin = 100000000; for (int i = 0; i < itemlist.Count; i++) { if (Convert.ToDouble(itemlist[i][1]) > yMax) yMax = Convert.ToDouble(itemlist[i][1]); if (Convert.ToDouble(itemlist[i][1]) < yMin) yMin = Convert.ToDouble(itemlist[i][1]); } } ///

/// 创建并输出图片 ///

/// 生成的文件路径 public string Draw() { #region 基础定义 //取得记录数量 int count = itemlist.Count; //记算图表宽度 int wd = 80 + 50 * (count - 1); //设置最小宽度为640 if (wd < 640) wd = 640; //生成Bitmap对像 Bitmap img = new Bitmap(wd, 400); //定义黑色画笔 Pen Bp = new Pen(Color.Black); //加粗的黑色 Pen BBp = new Pen(Color.Black, 2); //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); //定义大标题字体 Font Bfont = new Font("黑体", 12, FontStyle.Bold); //定义一般字体 Font font = new Font("Arial", 8); //定义大点的字体 Font Tfont = new Font("Arial", 9); //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); LinearGradientBrush Silverbrush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Silver, Color.Silver, 1.2F, true); #endregion //生成绘图对像 try { using (Graphics g = Graphics.FromImage(img)) { #region 绘制图表 //绘制底色 g.DrawRectangle(new Pen(Color.White, 400), 0, 0, img.Width, img.Height); //绘制大标题 g.DrawString(title, Bfont, brush, wd / 2 - title.Length * 10, 5); //绘制小标题 g.DrawString(title2, Tfont, Silverbrush, wd / 2 - title.Length * 10 + 40, 25); //绘制图片边框 g.DrawRectangle(Bp, 0, 0, img.Width - 1, img.Height - 1); //绘制Y坐标线 for (int i = 0; i < (count < 12 ? 12 : count); i++) g.DrawLine(Sp, 40 + 50 * i, 60, 40 + 50 * i, 360); //绘制X轴坐标标签 for (int i = 0; i < count; i++) g.DrawString(itemlist[i][0].ToString(), font, brush, 30 + 50 * i, 370); //绘制X坐标线 for (int i = 0; i < 11; i++) { g.DrawLine(Sp, 40, 60 + 30 * i, 40 + 50 * ((count < 12 ? 12 : count) - 1), 60 + 30 * i); double s = yMax - (yMax + Math.Abs(yMin)) / 10 * i;//最大的Y坐标值 g.DrawString(Math.Floor(s).ToString(), font, brush, 10, 55 + 30 * i); } //绘制Y坐标轴 g.DrawLine(BBp, 40, 50, 40, 360); //绘制X坐标轴 g.DrawLine(BBp, 40, 360, 40 + 50 * ((count < 12 ? 12 : count) - 1) + 10, 360); #endregion #region 绘制曲线 //定义曲线转折点 Point[] p = new Point[count]; for (int i = 0; i < count; i++) { p[i].X = 40 + 50 * i; p[i].Y = 360 - (int)(((Convert.ToDouble(itemlist[i][1]) + Math.Abs(yMin)) / ((yMax + Math.Abs(yMin)) / 10)) * 30); } //绘制发送曲线 g.DrawLines(Rp, p); for (int i = 0; i < count; i++) { //绘制发送记录点的数值 g.DrawString(itemlist[i][1].ToString(), font, Bluebrush, p[i].X + 5, p[i].Y - 10); //绘制发送记录点 g.DrawRectangle(Rp, p[i].X - 2, p[i].Y - 2, 4, 4); } #endregion //绘制Y坐标标题 g.DrawString(ytitle, Tfont, brush, 10, 40); //绘制X坐标标题 g.DrawString(xtitle, Tfont, brush, 30, 385); //图片质量 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //保存绘制的图片 string basePath = HttpContext.Current.Server.MapPath("/Curve/"), fileName = Guid.NewGuid() + ".jpg"; using (FileStream fs = new FileStream(basePath + fileName, FileMode.CreateNew)) { if (!System.IO.Directory.Exists(basePath)) System.IO.Directory.CreateDirectory(basePath); img.Save(fs, ImageFormat.Jpeg); return "/Curve/" + fileName; } } } catch (Exception) { throw; } } } }