http://blog.csdn.net/xyz7885696/article/details/2482842
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;using System.Drawing.Drawing2D;namespace qyjz
{ 
public class DrawHelper
{ /// <summary> ///渐变颜色的函数 /// </summary>
/// <returns>LinearGradientBrush 对象</returns> private LinearGradientBrush GetColor(int ylong) { LinearGradientBrush linGrBrush = new LinearGradientBrush( new Point(0, 0), new Point(0, ylong), Color.FromArgb(255, 255, 0, 0), // Opaque red Color.FromArgb(255, 0, 0, 255)); return linGrBrush; } /// <summary> /// 刻度线生成函数 /// </summary> /// <param name="objGraphics">Graphics对象</param> /// <param name="intxLong">图像x大小</param> /// <param name="intyLong">图像y大小</param> /// <param name="intxLeft">图像左边巨</param> /// <param name="intEnd">图像下边距</param> /// <param name="intyMax">刻度数</param> /// <param name="kdvalue">刻度值</param> /// <returns></returns> public Graphics DwLine(Graphics objGraphics, int intxLong, int intyLong, int intxLeft, int intEnd, int intyMax, float kdvalue, string title) { objGraphics.Clear(Color.White); int intyScale = intyLong / intyMax; objGraphics.DrawString(title, new Font("宋体", 9), Brushes.Black, new PointF(5 + intxLeft, 5)); Point p1 = new Point(intxLeft - 10, intyLong); Pen p = new Pen(Color.Silver); p.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash; for (int i = 0; i < intyMax; i++) { p1.Y = intyLong - i * intyScale; Point pt = new Point(p1.X + 10, p1.Y); objGraphics.DrawLine(Pens.Black, pt, new Point(p1.X + 15, p1.Y));//刻度线y轴 objGraphics.DrawLine(p, intxLeft, intyLong - intEnd - i * intyScale, intxLong, intyLong - intEnd - i * intyScale); objGraphics.DrawString(Convert.ToString(kdvalue * i), new Font("宋体", 9), Brushes.Black, new Point(p1.X - 20, p1.Y - 30)); } objGraphics.DrawLine(new Pen(Color.Black, 2), intxLeft, intyLong - intEnd, intxLeft, 0);//绘制y轴 objGraphics.DrawLine(new Pen(Color.Black, 2), intxLeft, intyLong - intEnd, intxLong, intyLong - intEnd);//绘制x轴 return objGraphics; } /// <summary> /// 生成矩形图 /// </summary> /// <param name="objGraphics">Graphics 对象</param> /// <param name="intxLong">图像x大小</param> /// <param name="intyLong">图像y大小</param> /// <param name="intxLeft">图像左边距</param> /// <param name="intEnd">图像下边距</param> /// <param name="intyMax">刻度数</param> /// <param name="kdvalue">刻度值</param> /// <param name="title">图片显示名</param> /// <param name="mydt">DataTable的值</param> /// <returns>Graphics</returns> public Graphics DwMonthjxt(Graphics objGraphics, int intxLong, int intyLong, int intxLeft, int intEnd, int intyMax, float kdvalue, DataTable mydt, int jdwidth) { int intyScale = intyLong / intyMax; float jx = Convert.ToInt32(jdwidth * 0.618); for (int i = 0; i < mydt.Rows.Count; i++) { float values = Convert.ToInt32(mydt.Rows[i]["co"].ToString()); if (values != 0) { objGraphics.FillRectangle(GetColor(intyLong), (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd, jx, values / kdvalue * intyScale);//画矩形内部图案 objGraphics.DrawRectangle(Pens.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd, jx, values / kdvalue * intyScale);//矩形外部图案 objGraphics.DrawString(mydt.Rows[i]["co"].ToString(), new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 15);//矩形上的数值 objGraphics.DrawString(mydt.Rows[i]["months"].ToString() + "月", new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - intEnd + 3);//x轴下的文字 } else { objGraphics.FillRectangle(GetColor(intyLong), (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 2, jx, values / kdvalue * intyScale + 2);//画矩形内部图案 objGraphics.DrawRectangle(Pens.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 2, jx, values / kdvalue * intyScale + 2);//矩形外部图案 objGraphics.DrawString(mydt.Rows[i]["co"].ToString(), new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 15);//矩形上的数值 objGraphics.DrawString(mydt.Rows[i]["months"].ToString() + "月", new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - intEnd + 3);//x轴下的文字 } } return objGraphics; } /// <summary> /// 生成矩形图 /// </summary> /// <param name="objGraphics">Graphics 对象</param> /// <param name="intxLong">图像x大小</param> /// <param name="intyLong">图像y大小</param> /// <param name="intxLeft">图像左边距</param> /// <param name="intEnd">图像下边距</param> /// <param name="intyMax">刻度数</param> /// <param name="kdvalue">刻度值</param> /// <param name="title">图片显示名</param> /// <param name="mydt">DataTable的值</param> /// <returns>Graphics</returns> public Graphics DwHourjxt(Graphics objGraphics, int intxLong, int intyLong, int intxLeft, int intEnd, int intyMax, float kdvalue, DataTable mydt, int jdwidth) { int intyScale = intyLong / intyMax; float jx = Convert.ToInt32(jdwidth * 0.618); for (int i = 0; i < mydt.Rows.Count; i++) { float values = Convert.ToInt32(mydt.Rows[i]["co"].ToString()); if (values != 0) { objGraphics.FillRectangle(GetColor(intyLong), (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd, jx, values / kdvalue * intyScale);//画矩形内部图案 objGraphics.DrawRectangle(Pens.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd, jx, values / kdvalue * intyScale);//矩形外部图案 objGraphics.DrawString(mydt.Rows[i]["co"].ToString(), new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 15);//矩形上的数值 objGraphics.DrawString(mydt.Rows[i]["Hours"].ToString() + "时", new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - intEnd + 3);//x轴下的文字 } else { objGraphics.FillRectangle(GetColor(intyLong), (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 2, jx, values / kdvalue * intyScale + 2);//画矩形内部图案 objGraphics.DrawRectangle(Pens.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 2, jx, values / kdvalue * intyScale + 2);//矩形外部图案 objGraphics.DrawString(mydt.Rows[i]["co"].ToString(), new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - values / kdvalue * intyScale - intEnd - 15);//矩形上的数值 objGraphics.DrawString(mydt.Rows[i]["Hours"].ToString() + "时", new Font("宋体", 9), Brushes.Black, (i * jdwidth) + intxLeft + 20, intyLong - intEnd + 3);//x轴下的文字 } } return objGraphics; } }
}