C# 画坐标，graphics，C# 坐标自定义X轴、Y轴

先看效果：

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。

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();
                g.DrawLine(new Pen(Brushes.Black, 2), px1, px2);
                StringFormat drawFormat = new StringFormat();
                drawFormat.Alignment = StringAlignment.Far;
                drawFormat.LineAlignment = StringAlignment.Center;
                g.DrawString(sx, new Font("宋体", 8f), Brushes.Black, new PointF(move / 1.2f, LenY * i / len + move*1.1f ), drawFormat);
            }
            Pen pen = new Pen(Color.Black, 1);
            g.DrawString("Y轴", new Font("宋体 ", 10f), Brushes.Black, new PointF(move / 3, move / 2f));
        }
        #endregion

        /// <summary>
        /// 画出Y轴上的分值线，从任意值开始
        /// </summary>
        /// <param name="pan"></param>
        /// <param name="minY"></param>
        /// <param name="maxY"></param>
        /// <param name="len"></param>
        #region   画出Y轴上的分值线，从任意值开始
        public static void DrawYLine(Panel pan, float minY, 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 - minY) * i / len).ToString();
                g.DrawLine(new Pen(Brushes.Black, 2), px1, px2);
                StringFormat drawFormat = new StringFormat();
                drawFormat.Alignment = StringAlignment.Far;
                drawFormat.LineAlignment = StringAlignment.Center;
                g.DrawString(sx, new Font("宋体", 8f), Brushes.Black, new PointF(move / 1.2f, LenY * i / len + move * 1.1f), drawFormat);
            }
            Pen pen = new Pen(Color.Black, 1);
            g.DrawString("Y轴", new Font("宋体 ", 10f), Brushes.Black, new PointF(move / 3, move / 2f));
        }

        #endregion
        /// <summary>
        /// 画出X轴上的分值线，从零开始
        /// </summary>
        /// <param name="pan"></param>
        /// <param name="maxX"></param>
        /// <param name="len"></param>
        #region   画出X轴上的分值线，从零开始
        public static void DrawXLine(Panel pan, float maxX, int len)
        {
            float move = 50f;
            float LenX = pan.Width - 2 * move;
            float LenY = pan.Height - 2 * move;
            Graphics g = pan.CreateGraphics();
            for (int i = 1; i <= len; i++)
            {
                PointF py1 = new PointF(LenX * i / len + move, pan.Height - move - 4);
                PointF py2 = new PointF(LenX * i / len + move, pan.Height - move);
                string sy = (maxX * i / len).ToString();
                g.DrawLine(new Pen(Brushes.Black, 2), py1, py2);
                g.DrawString(sy, new Font("宋体", 8f), Brushes.Black, new PointF(LenX * i / len + move, pan.Height - move / 1.1f));
            }
            Pen pen = new Pen(Color.Black, 1);
            g.DrawString("X轴", new Font("宋体 ", 10f), Brushes.Black, new PointF(pan.Width - move /1.5f, pan.Height - move / 1.5f));
        }
        #endregion

        #region   画出X轴上的分值线，从任意值开始
        /// <summary>
        /// 画出X轴上的分值线，从任意值开始
        /// </summary>
        /// <param name="pan"></param>
        /// <param name="minX"></param>
        /// <param name="maxX"></param>
        /// <param name="len"></param>
        public static void DrawXLine(Panel pan, float minX, float maxX, 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++)
            {
                PointF py1 = new PointF(LenX * i / len + move, pan.Height - move - 4);
                PointF py2 = new PointF(LenX * i / len + move, pan.Height - move);
                string sy = ((maxX - minX) * i / len + minX).ToString();
                g.DrawLine(new Pen(Brushes.Black, 2), py1, py2);
                g.DrawString(sy, new Font("宋体", 8f), Brushes.Black, new PointF(LenX * i / len + move, pan.Height - move / 1.1f));
            }
            Pen pen = new Pen(Color.Black, 1);
            g.DrawString("X轴", new Font("宋体 ", 10f), Brushes.Black, new PointF(pan.Width - move / 1.5f, pan.Height - move / 1.5f));
        }
        #endregion

    }
}

调用部分：一个主窗体，里面放一个Panel，就可以调用了：这里的Panel的名字是pnlPic，然后写她的Paint事件就可以了

  private void pnlPic_Paint(object sender, PaintEventArgs e)
        {   
            XYLinesFactory.DrawXY(pnlPic);
            XYLinesFactory.DrawYLine(pnlPic, 3, 4, 5);
            XYLinesFactory.DrawXLine(pnlPic, 1.2f, 8);
        }