使用C#绘制光谱反射率曲线

来源：互联网发布：shake it 下载编辑：程序博客网时间：2024/06/08 06:30

花了三四个小时，终于还算把曲线画出来了。

大致过程是：

首先从txt文件里取出数据，另存进其他变量里。

其次就是指定自己所要绘制曲线的坐标系的原点，以及规划好坐标轴的刻度等。

然后就是要考虑数据情况，坐标系变换等

最后就可以实现在form上绘制曲线了，过程比较繁琐，细节较多。

代码如下：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;using System.Diagnostics;using GDIDemo;using System.Drawing.Drawing2D;namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        int[] XAxis = new int[601];        double[] YAxis = new double[601];        private void buttonX2_Click(object sender, EventArgs e)        {            //数据准备,读取txt文件            StreamReader sr = new StreamReader("E:\\1021grass2003-0001-filtered.txt", Encoding.Default);            String line;            string[] temp1 = new string[20];            string[] temp2 = new string[5];            string[] info1 = new string[601];            string[] info2 = new string[601];            int i = 0, j = 0;            while ((line = sr.ReadLine()) != null)            {                temp1 = line.Trim().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);//去掉Split出来的空白字符串                info1[i] = temp1[0];                info2[j] = temp1[1];                XAxis[i] = Convert.ToInt32(temp1[0]);                YAxis[j] = Convert.ToDouble(temp1[1]);                i++;                j++;            }            //foreach (int iii in XAxis)            //    Debug.WriteLine(iii);            //Debug.WriteLine(XAxis.Length);            //创建Graphics对象            Graphics myGraphic = this.CreateGraphics();            //确定坐标系原点            Point centerPoint = new Point(250, 350);            PointF[] dataPoint1 = new PointF[601];            Font font = new Font("宋体", 12);            //重新new了一只笔，可以自己设置一些更详细的属性            Pen pen = new Pen(Color.Black, 1);            pen.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;            //画x轴            myGraphic.DrawLine(pen, centerPoint, new Point(centerPoint.X + 500, centerPoint.Y));                       //画X轴的刻度，80像素为单位            for (int ix = 0; ix < 6; ix++)            {                myGraphic.DrawLine(Pens.Red, new Point(centerPoint.X + (ix + 1) * 80, centerPoint.Y), new Point(centerPoint.X + (ix + 1) * 80, centerPoint.Y - 5));                //绘制x轴显示的汉字“nm”                myGraphic.DrawString(((ix+1)*200).ToString(), font, Brushes.Black, new PointF((centerPoint.X + (ix + 1) * 80) - 10, centerPoint.Y + 3));            }            myGraphic.DrawString("nm", font, Brushes.Black, new PointF(760, 350));            //画Y轴，刻度以20像素为单位            myGraphic.DrawLine(pen, centerPoint, new Point(centerPoint.X, 130));            for (int iy = 0; iy < 10; iy++)            {                myGraphic.DrawLine(Pens.Black, new Point(centerPoint.X, centerPoint.Y - (iy + 1) * 20), new Point(centerPoint.X + 5, centerPoint.Y - (iy + 1) * 20));                //绘制y轴显示的数字0.1、0.2、0.3、、、、、、、                myGraphic.DrawString(string.Format("{0}", (iy + 1) * 0.1), font, Brushes.Black, new PointF(centerPoint.X - 40, (centerPoint.Y - (iy + 1) * 20) - 5));            }            //计算光谱曲线对应的坐标点            for (int iz = 0; iz < YAxis.Length; iz++)            {                //float y = centerPoint.Y - (float)(YAxis[iz] * 2.5);                //float x = centerPoint.X + (iz + 1) * 1000;                PointF point = new PointF((float)XAxis[iz], (float)YAxis[iz]);                dataPoint1[iz] = point;            }            //Debug.WriteLine(dataPoint.Length);            //foreach (PointF myp in dataPoint)            //    Debug.WriteLine(myp);            GraphicsPath path = new GraphicsPath();            //绘制光谱反射曲线的601个点                      //坐标转换            PointF[] dataPoint = new PointF[601];            for (int ic = 0; ic < dataPoint1.Length; ic++)            {                PointF point = new PointF((float)(dataPoint1[ic].X/200*80+250), (float)(350-dataPoint1[ic].Y/0.1*20));                dataPoint[ic] = point;                Debug.WriteLine(dataPoint[ic]);                //myGraphic.DrawRectangle(Pens.Black, (int)dataPoint[i].X, (int)dataPoint[i].Y, 2, 2);                path.AddRectangle(new RectangleF(dataPoint[ic], new SizeF(2, 2)));            }            path.AddLines(dataPoint);            myGraphic.DrawPath(Pens.Blue, path);                    font.Dispose();            pen.Dispose();        }    }}

其中，txt文件内容如下：

……………

绘制效果（因为txt的第二列数据非常接近所以曲线效果不太明显）：

完！

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