使用C#在Panel中绘制X,Y轴并进行分轴

其中X轴，Y轴都是可以自定义的，可以从零开始，也可以从任意位置开始。

看坐标的画法：，

下面通过五个函数，来分别说明，注意这里坐标的定位是通过外层的Panel来实现的。

[csharp] view plaincopyprint?
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace PointToPic
{
    class XYLinesFactory
    {
        #region   画出X轴与Y轴
        /// <summary>
        /// 在任意的panel里画一个坐标，坐标所在的四边形距离panel边50像素
        /// </summary>
        /// <param name="pan"></param>
        public static void DrawXY(Panel pan)
        {
            Graphics g = pan.CreateGraphics();
            //整体内缩move像素
            float move = 50f;
            float newX = pan.Width - move;
            float newY = pan.Height - move;

            //绘制X轴,
            PointF px1 = new PointF(move, newY);
            PointF px2 = new PointF(newX, newY);
            g.DrawLine(new Pen(Brushes.Black, 2), px1, px2);
            //绘制Y轴
            PointF py1 = new PointF(move, move);
            PointF py2 = new PointF(move, newY);

            g.DrawLine(new Pen(Brushes.Black, 2), py1, py2);
        }
        #endregion

        /// <summary>
        /// 画出Y轴上的分值线，从零开始
        /// </summary>
        /// <param name="pan"></param>
        /// <param name="maxY"></param>
        /// <param name="len"></param>
        #region   画出Y轴上的分值线，从零开始
        public static void DrawYLine(Panel pan, float maxY, int len)
        {
            float move = 50f;
            float LenX = pan.Width - 2 * move;
            float LenY = pan.Height - 2 * move;
            Graphics g = pan.CreateGraphics();
            for (int i = 0; i <= len; i++)    //len等份Y轴
            {
                PointF px1 = new PointF(move, LenY * i / len + move);
                PointF px2 = new PointF(move + 4, LenY * i / len + move);
                string sx = (maxY - maxY * i / len).ToString();