已经封装好的，代码中已标有详细注释，不再多说。使用时实例化Curve类，再引用CreateImage()方法即可。
效果图如上：
public class Curve { #region 变量 private Graphics objGraphics; //Graphics 类提供对象绘制的方法 private Bitmap objBitmap; //位图对象 private int m_Width = 900; //图像宽度 private int m_Height = 500; //图像高度 private float m_XSlice = 50; //X轴刻度宽度 private float m_YSlice = 50; //Y轴刻度宽度 private float m_YSliceValue = 20; //Y轴刻度的数值宽度 private float m_YSliceBegin = 0; //Y轴刻度开始值 private float m_Tension = 0.5f; private string m_Title = "××公司销售情况曲线图"; //Title private string m_Unit = "万元"; //单位 private string m_XAxisText = "月份"; //X轴说明文字 private string m_YAxisText = "万元"; //Y轴说明文字 private string[] m_Keys = 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[] m_Values = 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 }; //值 private Color m_BgColor = Color.Snow; //背景 private Color m_TextColor = Color.Black; //文字颜色 private Color m_BorderColor = Color.Black; //整体边框颜色 private Color m_AxisColor = Color.Black; //轴线颜色 private Color m_AxisTextColor = Color.Black; //轴说明文字颜色 private Color m_SliceTextColor = Color.Black; //刻度文字颜色 private Color m_SliceColor = Color.Black; //刻度颜色 private Color m_CurveColor = Color.Red; //曲线颜色 #endregion #region 属性 public int Width { set { if (value < 300) { m_Width = 300; } else { m_Width = value; } } get { return m_Width; } } public int Height { set { if (value < 300) { m_Height = 300; } else { m_Height = value; } } get { return m_Height; } } public float XSlice { set { m_XSlice = value; } get { return m_XSlice; } } public float YSlice { set { m_YSlice = value; } get { return m_YSlice; } } public float YSliceValue { set { m_YSliceValue = value; } get { return m_YSliceValue; } } public float YSliceBegin { set { m_YSliceBegin = value; } get { return m_YSliceBegin; } } public float Tension { set { if (value < 0.0f && value > 1.0f) { m_Tension = 0.5f; } else { m_Tension = value; } } get { return m_Tension; } } public string Title { set { m_Title = value; } get { return m_Title; } } public string Unit { set { m_Unit = value; } get { return m_Unit; } } public string[] Keys { set { m_Keys = value; } get { return m_Keys; } } public float[] Values { set { m_Values = value; } get { return m_Values; } } public Color BgColor { set { m_BgColor = value; } get { return m_BgColor; } } public Color TextColor { set { m_TextColor = value; } get { return m_TextColor; } } public Color BorderColor { set { m_BorderColor = value; } get { return m_BorderColor; } } public Color AxisColor { set { m_AxisColor = value; } get { return m_AxisColor; } } public string XAxisText { set { m_XAxisText = value; } get { return m_XAxisText; } } public string YAxisText { set { m_YAxisText = value; } get { return m_YAxisText; } } public Color AxisTextColor { set { m_AxisTextColor = value; } get { return m_AxisTextColor; } } public Color SliceTextColor { set { m_SliceTextColor = value; } get { return m_SliceTextColor; } } public Color SliceColor { set { m_SliceColor = value; } get { return m_SliceColor; } } public Color CurveColor { set { m_CurveColor = value; } get { return m_CurveColor; } } #endregion #region 方法 //生成图像并返回bmp对象 public Bitmap CreateImage() { InitializeGraph(); DrawContent(ref objGraphics); return objBitmap; } //初始化和填充图像区域，画出边框，初始标题 private void InitializeGraph() { //根据给定的高度和宽度创建一个位图图像 objBitmap = new Bitmap(Width, 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, Height); objGraphics.FillRectangle(new SolidBrush(BgColor), 1, 1, Width - 2, Height - 2); //画X轴,pen,x1,y1,x2,y2 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 objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor), 1), 100, Height - 100, Width - 75, Height - 100); //画Y轴,pen,x1,y1,x2,y2 objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor), 1), 100, Height - 100, 100, 75); //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); //平移图像对象 objGraphics.TranslateClip(200, 0); } private void SetAxisText(ref Graphics objGraphics) { objGraphics.DrawString(XAxisText, new Font("宋体", 10), new SolidBrush(AxisTextColor), Width / 2 - 50, Height - 50); int X = 30; int Y = (Height / 2) - 50; for (int i = 0; i < YAxisText.Length; i++) { objGraphics.DrawString(YAxisText[i].ToString(), new Font("宋体", 10), new SolidBrush(AxisTextColor), X, Y); Y += 15; } } private void SetXAxis(ref Graphics objGraphics) { int x1 = 100; int y1 = Height - 110; int x2 = 100; int y2 = Height - 90; int iCount = 0; int iSliceCount = 1; float Scale = 0; int iWidth = (int)((Width - 200) * (50 / XSlice)); objGraphics.DrawString(Keys[0].ToString(), new Font("宋体", 10), new SolidBrush(SliceTextColor), 85, Height - 90); for (int i = 0; i <= iWidth; i += 10) { Scale = i * (XSlice / 50); if (iCount == 5) { objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor)), x1 + Scale, y1, x2 + Scale, y2); //The Point!这里显示X轴刻度 if (iSliceCount <= Keys.Length - 1) { objGraphics.DrawString(Keys[iSliceCount].ToString(), new Font("宋体", 10), new SolidBrush(SliceTextColor), x1 + Scale - 15, y2); } else { //超过范围，不画任何刻度文字 } iCount = 0; iSliceCount++; if (x1 + Scale > Width - 100) { break; } } else { objGraphics.DrawLine(new Pen(new SolidBrush(SliceColor)), x1 + Scale, y1 + 5, x2 + Scale, y2 - 5); } iCount++; } } private void SetYAxis(ref Graphics objGraphics) { int x1 = 95; int y1 = (int)(Height - 100 - 10 * (YSlice / 50)); int x2 = 105; int y2 = (int)(Height - 100 - 10 * (YSlice / 50)); int iCount = 1; float Scale = 0; int iSliceCount = 1; int iHeight = (int)((Height - 200) * (50 / YSlice)); objGraphics.DrawString(YSliceBegin.ToString(), new Font("宋体", 10), new SolidBrush(SliceTextColor), 60, Height - 110); for (int i = 0; i < iHeight; i += 10) { Scale = i * (YSlice / 50); if (iCount == 5) { objGraphics.DrawLine(new Pen(new SolidBrush(AxisColor)), x1 - 5, y1 - Scale, x2 + 5, y2 - Scale); //显示Y轴刻度 objGraphics.DrawString(Convert.ToString(YSliceValue * iSliceCount + YSliceBegin), new Font("宋体", 10), new SolidBrush(SliceTextColor), 60, y1 - Scale); iCount = 0; iSliceCount++; } else { objGraphics.DrawLine(new Pen(new SolidBrush(SliceColor)), x1, y1 - Scale, x2, y2 - Scale); } iCount++; } } private void DrawContent(ref Graphics objGraphics) { if (Keys.Length == Values.Length) { Pen CurvePen = new Pen(CurveColor, 1); PointF[] CurvePointF = new PointF[Keys.Length]; float keys = 0; float values = 0; float Offset1 = (Height - 100) + YSliceBegin; float Offset2 = (YSlice / 50) * (50 / YSliceValue); for (int i = 0; i < Keys.Length; i++) { keys = XSlice * i + 100; values = Offset1 - Values[i] * Offset2; CurvePointF[i] = new PointF(keys, values); } objGraphics.DrawCurve(CurvePen, CurvePointF, Tension); } else { objGraphics.DrawString("Error!The length of Keys and Values must be same!", new Font("宋体", 16), new SolidBrush(TextColor), new Point(150, Height / 2)); } } //写标题 private void CreateTitle(ref Graphics objGraphics) { objGraphics.DrawString(Title, new Font("宋体", 16), new SolidBrush(TextColor), new Point(5, 5)); } #endregion } }}
