C#绘制曲线图的方法

/// <summary>/// 自动根据参数调整图像大小/// </summary>public void Fit(){ //计算字体距离 intFontSpace = FontSize + 5; //计算图像边距 float fltSpace = Math.Min(Width / 6, Height / 6); XSpace = fltSpace; YSpace = fltSpace; //计算X轴刻度宽度 XSlice = (Width - 2 * XSpace) / (Keys.Length - 1); //计算Y轴刻度宽度和Y轴刻度开始值 float fltMinValue = 0; float fltMaxValue = 0; for (int i = 0; i < Values.Length; i++) {  if (Values[i] < fltMinValue)  {  fltMinValue = Values[i];  }  else if (Values[i] > fltMaxValue)  {  fltMaxValue = Values[i];  } } if (YSliceBegin > fltMinValue) {  YSliceBegin = fltMinValue; } int intYSliceCount = (int)(fltMaxValue / YSliceValue); if (fltMaxValue % YSliceValue != 0) {  intYSliceCount++; } YSlice = (Height - 2 * YSpace) / intYSliceCount;}

using System;using System.Collections.Generic;using System.Text;using System.Drawing;using System.Data;using System.Drawing.Drawing2D;namespace SarchPMS.Business.Draw{ public class DrawingCurve : DrawingChart {  /// <summary>  /// 画曲线图  /// </summary>  /// <param name="dsParameter"></param>  /// <returns></returns>  public override Bitmap DrawImage(DataSet dsParameter)  {   Curve2D cuv2D = new Curve2D();   cuv2D.Fit();   return cuv2D.CreateImage();  } } public class Curve2D {  private Graphics objGraphics; //Graphics 类提供将对象绘制到显示设备的方法  private Bitmap objBitmap; //位图对象  private float fltWidth = 480; //图像宽度  private float fltHeight = 248; //图像高度  private float fltXSlice = 50; //X轴刻度宽度  private float fltYSlice = 50; //Y轴刻度宽度  private float fltYSliceValue = 20; //Y轴刻度的数值宽度  private float fltYSliceBegin = 0; //Y轴刻度开始值  private float fltTension = 0.5f;  private string strTitle = "曲线图"; //标题  private string strXAxisText = "月份"; //X轴说明文字  private string strYAxisText = "万元"; //Y轴说明文字  private string[] strsKeys = new string[] { "一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月" }; //键  private float[] fltsValues = new float[] { 20.0f, 30.0f, 50.0f, 55.4f, 21.6f, 12.8f, 99.5f, 36.4f, 78.2f, 56.4f, 45.8f, 66.5f, 99.5f, 36.4f, 78.2f, 56.4f, 45.8f, 66.5f, 20.0f, 30.0f, 50.0f, 55.4f, 21.6f, 12.8f }; //值  private Color clrBgColor = Color.Snow; //背景色  private Color clrTextColor = Color.Black; //文字颜色  private Color clrBorderColor = Color.Black; //整体边框颜色  private Color clrAxisColor = Color.Black; //轴线颜色  private Color clrAxisTextColor = Color.Black; //轴说明文字颜色  private Color clrSliceTextColor = Color.Black; //刻度文字颜色  private Color clrSliceColor = Color.Black; //刻度颜色  private Color[] clrsCurveColors = new Color[] { Color.Red, Color.Blue }; //曲线颜色  private float fltXSpace = 100f; //图像左右距离边缘距离  private float fltYSpace = 100f; //图像上下距离边缘距离  private int intFontSize = 9; //字体大小号数  private float fltXRotateAngle = 30f; //X轴文字旋转角度  private float fltYRotateAngle = 0f; //Y轴文字旋转角度  private int intCurveSize = 2; //曲线线条大小  private int intFontSpace = 0; //intFontSpace 是字体大小和距离调整出来的一个比较适合的数字  #region 公共属性  /// <summary>  /// 图像的宽度  /// </summary>  public float Width  {   set   {    if (value < 100)    {     fltWidth = 100;    }    else    {     fltWidth = value;    }   }   get   {    if (fltWidth <= 100)    {     return 100;    }    else    {     return fltWidth;    }   }  }  /// <summary>  /// 图像的高度  /// </summary>  public float Height  {   set   {    if (value < 100)    {     fltHeight = 100;    }    else    {     fltHeight = value;    }   }   get   {    if (fltHeight <= 100)    {     return 100;    }    else    {     return fltHeight;    }   }  }  /// <summary>  /// X轴刻度宽度  /// </summary>  public float XSlice  {   set { fltXSlice = value; }   get { return fltXSlice; }  }  /// <summary>  /// Y轴刻度宽度  /// </summary>  public float YSlice  {   set { fltYSlice = value; }   get { return fltYSlice; }  }  /// <summary>  /// Y轴刻度的数值宽度  /// </summary>  public float YSliceValue  {   set { fltYSliceValue = value; }   get { return fltYSliceValue; }  }  /// <summary>  /// Y轴刻度开始值  /// </summary>  public float YSliceBegin  {   set { fltYSliceBegin = value; }   get { return fltYSliceBegin; }  }  /// <summary>  /// 张力系数  /// </summary>  public float Tension  {   set   {    if (value < 0.0f && value > 1.0f)    {     fltTension = 0.5f;    }    else    {     fltTension = value;    }   }   get   {    return fltTension;   }  }  /// <summary>  /// 标题  /// </summary>  public string Title  {   set { strTitle = value; }   get { return strTitle; }  }  /// <summary>  /// 键，X轴数据  /// </summary>  public string[] Keys  {   set { strsKeys = value; }   get { return strsKeys; }  }  /// <summary>  /// 值，Y轴数据  /// </summary>  public float[] Values  {   set { fltsValues = value; }   get { return fltsValues; }  }  /// <summary>  /// 背景色  /// </summary>  public Color BgColor  {   set { clrBgColor = value; }   get { return clrBgColor; }  }  /// <summary>  /// 文字颜色  /// </summary>  public Color TextColor  {   set { clrTextColor = value; }   get { return clrTextColor; }  }  /// <summary>  /// 整体边框颜色  /// </summary>  public Color BorderColor  {   set { clrBorderColor = value; }   get { return clrBorderColor; }  }  /// <summary>  /// 轴线颜色  /// </summary>  public Color AxisColor  {   set { clrAxisColor = value; }   get { return clrAxisColor; }  }  /// <summary>  /// X轴说明文字  /// </summary>  public string XAxisText  {   set { strXAxisText = value; }   get { return strXAxisText; }  }  /// <summary>  /// Y轴说明文字  /// </summary>  public string YAxisText  {   set { strYAxisText = value; }   get { return strYAxisText; }  }  /// <summary>  /// 轴说明文字颜色  /// </summary>  public Color AxisTextColor  {   set { clrAxisTextColor = value; }   get { return clrAxisTextColor; }  }  /// <summary>  /// 刻度文字颜色  /// </summary>  public Color SliceTextColor  {   set { clrSliceTextColor = value; }   get { return clrSliceTextColor; }  }  /// <summary>  /// 刻度颜色  /// </summary>  public Color SliceColor  {   set { clrSliceColor = value; }   get { return clrSliceColor; }  }  /// <summary>  /// 曲线颜色  /// </summary>  public Color[] CurveColors  {   set { clrsCurveColors = value; }   get { return clrsCurveColors; }  }  /// <summary>  /// X轴文字旋转角度  /// </summary>  public float XRotateAngle  {   get { return fltXRotateAngle; }   set { fltXRotateAngle = value; }  }  /// <summary>  /// Y轴文字旋转角度  /// </summary>  public float YRotateAngle  {   get { return fltYRotateAngle; }   set { fltYRotateAngle = value; }  }  /// <summary>  /// 图像左右距离边缘距离  /// </summary>  public float XSpace  {   get { return fltXSpace; }   set { fltXSpace = value; }  }  /// <summary>  /// 图像上下距离边缘距离  /// </summary>  public float YSpace  {   get { return fltYSpace; }   set { fltYSpace = value; }  }  /// <summary>  /// 字体大小号数  /// </summary>  public int FontSize  {   get { return intFontSize; }   set { intFontSize = value; }  }  /// <summary>  /// 曲线线条大小  /// </summary>  public int CurveSize  {   get { return intCurveSize; }   set { intCurveSize = value; }  }  #endregion  /// <summary>  /// 自动根据参数调整图像大小  /// </summary>  public void Fit()  {   //计算字体距离   intFontSpace = FontSize + 5;   //计算图像边距   float fltSpace = Math.Min(Width / 6, Height / 6);   XSpace = fltSpace;   YSpace = fltSpace;   //计算X轴刻度宽度   XSlice = (Width - 2 * XSpace) / (Keys.Length - 1);   //计算Y轴刻度宽度和Y轴刻度开始值   float fltMinValue = 0;   float fltMaxValue = 0;   for (int i = 0; i < Values.Length; i++)   {    if (Values[i] < fltMinValue)    {     fltMinValue = Values[i];    }    else if (Values[i] > fltMaxValue)    {     fltMaxValue = Values[i];    }   }   if (YSliceBegin > fltMinValue)   {    YSliceBegin = fltMinValue;   }   int intYSliceCount = (int)(fltMaxValue / YSliceValue);   if (fltMaxValue % YSliceValue != 0)   {    intYSliceCount++;   }   YSlice = (Height - 2 * YSpace) / intYSliceCount;  }  /// <summary>  /// 生成图像并返回bmp图像对象  /// </summary>  /// <returns></returns>  public Bitmap CreateImage()  {   InitializeGraph();   int intKeysCount = Keys.Length;   int intValuesCount = Values.Length;   if (intValuesCount % intKeysCount == 0)   {    int intCurvesCount = intValuesCount / intKeysCount;    for (int i = 0; i < intCurvesCount; i++)    {     float[] fltCurrentValues = new float[intKeysCount];     for (int j = 0; j < intKeysCount; j++)     {      fltCurrentValues[j] = Values[i * intKeysCount + j];     }     DrawContent(ref objGraphics, fltCurrentValues, clrsCurveColors[i]);    }   }   else   {    objGraphics.DrawString("发生错误，Values的长度必须是Keys的整数倍!", new Font("宋体", FontSize + 5), new SolidBrush(TextColor), new Point((int)XSpace, (int)(Height / 2)));   }   return objBitmap;  }  /// <summary>  /// 初始化和填充图像区域，画出边框，初始标题  /// </summary>  private void InitializeGraph()  {   //根据给定的高度和宽度创建一个位图图像   objBitmap = new Bitmap((int)Width, (int)Height);   //从指定的 objBitmap 对象创建 objGraphics 对象 (即在objBitmap对象中画图)   objGraphics = Graphics.FromImage(objBitmap);   //根据给定颜色(LightGray)填充图像的矩形区域 (背景)   objGraphics.DrawRectangle(new Pen(BorderColor, 1), 0, 0, Width - 1, Height - 1); //画边框   objGraphics.FillRectangle(new SolidBrush(BgColor), 1, 1, Width - 2, Height - 2); //填充边框   //画X轴,注意图像的原始X轴和Y轴计算是以左上角为原点，向右和向下计算的   float fltX1 = XSpace;   float fltY1 = Height - YSpace;   float fltX2 = Width - XSpace + XSlice / 2;   float fltY2 = fltY1;   objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor), 1), fltX1, fltY1, fltX2, fltY2);   //画Y轴   fltX1 = XSpace;   fltY1 = Height - YSpace;   fltX2 = XSpace;   fltY2 = YSpace - YSlice / 2;   objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor), 1), fltX1, fltY1, fltX2, fltY2);   //初始化轴线说明文字   SetAxisText(ref objGraphics);   //初始化X轴上的刻度和文字   SetXAxis(ref objGraphics);   //初始化Y轴上的刻度和文字   SetYAxis(ref objGraphics);   //初始化标题   CreateTitle(ref objGraphics);  }  /// <summary>  /// 初始化轴线说明文字  /// </summary>  /// <param name="objGraphics"></param>  private void SetAxisText(ref Graphics objGraphics)  {   float fltX = Width - XSpace + XSlice / 2 - (XAxisText.Length - 1) * intFontSpace;   float fltY = Height - YSpace - intFontSpace;   objGraphics.DrawString(XAxisText, new Font("宋体", FontSize), new SolidBrush(AxisTextColor), fltX, fltY);   fltX = XSpace + 5;   fltY = YSpace - YSlice / 2 - intFontSpace;   for (int i = 0; i < YAxisText.Length; i++)   {    objGraphics.DrawString(YAxisText[i].ToString(), new Font("宋体", FontSize), new SolidBrush(AxisTextColor), fltX, fltY);    fltY += intFontSpace; //字体上下距离   }  }  /// <summary>  /// 初始化X轴上的刻度和文字  /// </summary>  /// <param name="objGraphics"></param>  private void SetXAxis(ref Graphics objGraphics)  {   float fltX1 = XSpace;   float fltY1 = Height - YSpace;   float fltX2 = XSpace;   float fltY2 = Height - YSpace;   int iCount = 0;   int iSliceCount = 1;   float Scale = 0;   float iWidth = ((Width - 2 * XSpace) / XSlice) * 50; //将要画刻度的长度分段，并乘以50，以10为单位画刻度线。   float fltSliceHeight = XSlice / 10; //刻度线的高度   objGraphics.TranslateTransform(fltX1, fltY1); //平移图像(原点)   objGraphics.RotateTransform(XRotateAngle, MatrixOrder.Prepend); //旋转图像   objGraphics.DrawString(Keys[0].ToString(), new Font("宋体", FontSize), new SolidBrush(SliceTextColor), 0, 0);   objGraphics.ResetTransform(); //重置图像   for (int i = 0; i <= iWidth; i += 10) //以10为单位   {    Scale = i * XSlice / 50;//即(i / 10) * (XSlice / 5)，将每个刻度分五部分画，但因为i以10为单位，得除以10    if (iCount == 5)    {     objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor)), fltX1 + Scale, fltY1 + fltSliceHeight * 1.5f, fltX2 + Scale, fltY2 - fltSliceHeight * 1.5f);     //画网格虚线     Pen penDashed = new Pen(new SolidBrush(AxisColor));     penDashed.DashStyle = DashStyle.Dash;     objGraphics.DrawLine(penDashed, fltX1 + Scale, fltY1, fltX2 + Scale, YSpace - YSlice / 2);     //这里显示X轴刻度     if (iSliceCount <= Keys.Length - 1)     {      objGraphics.TranslateTransform(fltX1 + Scale, fltY1);      objGraphics.RotateTransform(XRotateAngle, MatrixOrder.Prepend);      objGraphics.DrawString(Keys[iSliceCount].ToString(), new Font("宋体", FontSize), new SolidBrush(SliceTextColor), 0, 0);      objGraphics.ResetTransform();     }     else     {      //超过范围，不画任何刻度文字     }     iCount = 0;     iSliceCount++;     if (fltX1 + Scale > Width - XSpace)     {      break;     }    }    else    {     objGraphics.DrawLine(new Pen(new SolidBrush(SliceColor)), fltX1 + Scale, fltY1 + fltSliceHeight, fltX2 + Scale, fltY2 - fltSliceHeight);    }    iCount++;   }  }  /// <summary>  /// 初始化Y轴上的刻度和文字  /// </summary>  /// <param name="objGraphics"></param>  private void SetYAxis(ref Graphics objGraphics)  {   float fltX1 = XSpace;   float fltY1 = Height - YSpace;   float fltX2 = XSpace;   float fltY2 = Height - YSpace;   int iCount = 0;   float Scale = 0;   int iSliceCount = 1;   float iHeight = ((Height - 2 * YSpace) / YSlice) * 50; //将要画刻度的长度分段，并乘以50，以10为单位画刻度线。   float fltSliceWidth = YSlice / 10; //刻度线的宽度   string strSliceText = string.Empty;   objGraphics.TranslateTransform(XSpace - intFontSpace * YSliceBegin.ToString().Length, Height - YSpace); //平移图像(原点)   objGraphics.RotateTransform(YRotateAngle, MatrixOrder.Prepend); //旋转图像   objGraphics.DrawString(YSliceBegin.ToString(), new Font("宋体", FontSize), new SolidBrush(SliceTextColor), 0, 0);   objGraphics.ResetTransform(); //重置图像   for (int i = 0; i < iHeight; i += 10)   {    Scale = i * YSlice / 50; //即(i / 10) * (YSlice / 5)，将每个刻度分五部分画，但因为i以10为单位，得除以10    if (iCount == 5)    {     objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor)), fltX1 - fltSliceWidth * 1.5f, fltY1 - Scale, fltX2 + fltSliceWidth * 1.5f, fltY2 - Scale);     //画网格虚线     Pen penDashed = new Pen(new SolidBrush(AxisColor));     penDashed.DashStyle = DashStyle.Dash;     objGraphics.DrawLine(penDashed, XSpace, fltY1 - Scale, Width - XSpace + XSlice / 2, fltY2 - Scale);     //这里显示Y轴刻度     strSliceText = Convert.ToString(YSliceValue * iSliceCount + YSliceBegin);     objGraphics.TranslateTransform(XSpace - intFontSize * strSliceText.Length, fltY1 - Scale); //平移图像(原点)     objGraphics.RotateTransform(YRotateAngle, MatrixOrder.Prepend); //旋转图像     objGraphics.DrawString(strSliceText, new Font("宋体", FontSize), new SolidBrush(SliceTextColor), 0, 0);     objGraphics.ResetTransform(); //重置图像     iCount = 0;     iSliceCount++;    }    else    {     objGraphics.DrawLine(new Pen(new SolidBrush(SliceColor)), fltX1 - fltSliceWidth, fltY1 - Scale, fltX2 + fltSliceWidth, fltY2 - Scale);    }    iCount++;   }  }  /// <summary>  /// 画曲线  /// </summary>  /// <param name="objGraphics"></param>  private void DrawContent(ref Graphics objGraphics, float[] fltCurrentValues, Color clrCurrentColor)  {   Pen CurvePen = new Pen(clrCurrentColor, CurveSize);   PointF[] CurvePointF = new PointF[Keys.Length];   float keys = 0;   float values = 0;   for (int i = 0; i < Keys.Length; i++)   {    keys = XSlice * i + XSpace;    values = (Height - YSpace) + YSliceBegin - YSlice * (fltCurrentValues[i] / YSliceValue);    CurvePointF[i] = new PointF(keys, values);   }   objGraphics.DrawCurve(CurvePen, CurvePointF, Tension);  }  /// <summary>  /// 初始化标题  /// </summary>  /// <param name="objGraphics"></param>  private void CreateTitle(ref Graphics objGraphics)  {   objGraphics.DrawString(Title, new Font("宋体", FontSize), new SolidBrush(TextColor), new Point((int)(Width - XSpace) - intFontSize * Title.Length, (int)(YSpace - YSlice / 2 - intFontSpace)));  } }}