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C#绘制坐标简易曲线控件

Posted on 2008-07-24 09:36 蓝天旭日 阅读(...) 评论(...) 编辑 收藏

 

winform

Download控件源码

简单例子

webForm

Download控件源码

简单例子

 

 

 

 

 

 

思路概要:

1 首先确定曲线轴的长度和宽度,确定原点,便于坐标转换

2 分别绘制X  Y轴,并且绘制刻度

3 根据实际数据在坐标轴上绘制数据标识

4 绘制曲线,计算实际坐标与数轴坐标之间的转换

5 响应各种鼠标事件

 

实现:

vs2005 +C# 实现(包括winformwebform)两种控件

 

注意问题:

1         winform控件问题需要解决闪烁问题,所以每次鼠标事件后都只重新绘制部分曲线或者坐标轴。背景上华坐标轴,pictureBox上画曲线。

2         控件图标问题,添加16*16象素bmp格式图片,Build Action设置为“Embedded Resource,曲线类头部引用为

[System.Drawing.ToolboxBitmap(typeof(hocylan_Curve.Icon), "UcDate.bmp")]

3         部分变量定义和坐标转换:

坐标转换:

float x,y分别为鼠标在数轴上的实际值,返回该点对应坐标轴的值

       private string TransPositionToValue(float x, float y)

        {

            int xPointIndex = Convert.ToInt32((x - XYO.X) / XSlice);//对应x轴的点号

            string xValue;

            float yValue;

            try

            {

                if (xPointIndex < Keys.Length && xPointIndex > 0)

                {

xValue = Keys[xPointIndex];

// Keys[xPointIndex];

                }

                else

                {

                    xValue = "-";

                }

                //Y的实际值

                yValue = ((XYO.Y - y) * YSliceValue) / YSlice + YSliceBegin;

                return "(" + x.ToString() + "," + y.ToString() + "),(" + xValue.ToString() + "," + yValue.ToString("#.##") + YUnit + ")";

            }

            catch (Exception ex)

            {

                return "(" + x.ToString() + "," + y.ToString() + "),(" + ex.Message.ToString() + ")";

            }

        }

变量定义:

   private Graphics objGraphics; //Graphics 类提供将对象绘制到显示设备的方法

        private Pen pen1 = new Pen(Color.Red, 2);

        private Point XYO = new Point();//坐标原点

        private Point XZ = new Point(); //X轴终点

        private Point YZ = new Point(); //Y轴终点

        private Bitmap objBitmap; //位图对象

        private int m_Width = 624; //图像宽度

        private int m_Height = 400; //图像高度

        private string m_Title = "曲线图"; //标题

        private float m_XSlice; //X轴刻度宽度

        private float m_YSlice; //Y轴刻度宽度

        private int xPointScaleNum = 15;//X轴点数(刻度数)

        private int xInScaleNum = 1;//X轴大刻度间的小刻度

        private float m_YSliceValue = 40; //Y轴刻度的数值宽度

        private float m_YSliceBegin = 10; //Y轴刻度开始值

        private float m_YSliceEnd = 200; //Y轴刻度最大值

        private int yPointScaleNum;//Y轴大点数

        private int m_YInSliceNum = 5; //Y轴刻度大刻度间的小刻度

        private float m_Tension = 0.0f;//设置张力

        private string m_yUnit = "KV"; //单位

        private string m_xUnit = ""; //单位

 

        private string m_XAxisText = "X轴说明文字"; //X轴说明文字

 

        private string m_YAxisText = "Y轴说明文字"; //Y轴说明文字

 

        private string[] m_Keys = new string[] { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31" }; //键

        private float[][] m_LineValue;//=new float[]{{120.5f, 23.0f, 23.90f, 0f, 22f, 100f },{ 20.5f, 123.0f, 3.90f, 92f, 122f, 190f },{200.5f, 123.0f, 90.90f, 100f, 0f, 50f }, };

        private Color[] lineColor = new Color[] { Color.Yellow, Color.Red, Color.White, Color.Green, Color.Orange, Color.BlueViolet };

 

        private Color m_BgColor = Color.DeepSkyBlue; //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.Blue; //轴线颜色

        private Color m_GriddingColor = Color.Blue; //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

 

代码和资源:

 

winform

Download控件源码

简单例子

webForm

Download控件源码

简单例子