C#教程之c# 曲线图生成代码

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C#教程之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;

/// <summary>

/// X坐标的标题

/// </summary>

public string Xtitle

{

get { return xtitle; }

set { xtitle = value; }

}

/// <summary>

/// Y坐标的标题

/// </summary>

public string Ytitle

{

get { return ytitle; }

set { ytitle = value; }

}

/// <summary>

/// 副标题

/// </summary>

public string Title2

{

get { return title2; }

set { title2 = value; }

}

/// <summary>

/// 主标题

/// </summary>

public string Title

{

get { return title; }

set { title = value; }

}

double yMax, yMin;

List<ArrayList> itemlist;

public CurveDrawing(List<ArrayList> 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]);

}

/// <summary>

/// 创建并输出图片

/// </summary>

/// <returns>生成的文件路径</returns>

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;

}

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