用 C# 绘制曲线图(Curve图,增加自动适应和多曲线绘制)

比以前Cool吧?呵呵,其实就是根据数据自动计算边距和字体等.

 

        /// <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;
        }

 

看我把数据缩小一个级别的效果:

 

因为代码里面充斥了大量注释,也不敲太多文字了..完整代码奉上:

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)));
        }
    }
}

虽然系统最后附上完整代码,但是上边已经贴完了.再上传代码就显得白痴了....大家Copy上边代码到自己的项目中,调用DrawImage即可看到效果.