winForm 绘图

Question

我在Form窗口上放了一个TabControl控件怎么在tabControl控件上 绘制一条直线。小弟初学，小菜鸟一个希望各位朋友帮忙

Answer 1

 
bang 你顶1下。。

Answer 2

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;namespace 老师的画图工具
{
    public partial class Form1 : Form
    {
        Point p1;
        Point p2;
        Point pOver;
        Graphics gShow;
        Pen pen;
        bool isOver;
        Bitmap bitShow;
        Graphics gSave;
        int type = 0;
        public Form1()
        {
            InitializeComponent();
            gShow = pictureBox1.CreateGraphics();
            pen = new Pen(Color.Black);
        }
        
        private void 新建ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            pictureBox1.Image = null;
        }        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "图片|*.jpg";
            openFileDialog1.ShowDialog();
            string path = openFileDialog1.FileName;
            FileStream fs = new FileStream(path, FileMode.Open);
            bitShow = new Bitmap(fs);
            fs.Close();
            pictureBox1.Image = bitShow;
            gSave = Graphics.FromImage(bitShow);
        }        private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            saveFileDialog1.ShowDialog();
            string path = saveFileDialog1.FileName;
            bitShow.Save(path);
        }        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {                isOver = true;
                p1.X = e.X;
                p1.Y = e.Y;
            }
        }        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isOver)
            {
                if (type == 0)
                {
                    p2.X = e.X;
                    p2.Y = e.Y;
                    gShow.DrawLine(pen, p1, p2);
                    gSave.DrawLine(pen, p1, p2);
                    p1.X = e.X;
                    p1.Y = e.Y;
                }
            }
        }        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            isOver = false;
            pOver.X = e.X;
            pOver.Y = e.Y;
            if (type == 1)
            {
                gShow.DrawEllipse(pen, p1.X, p1.Y, (pOver.X - p1.X), (pOver.Y - p1.Y));
            }
        }
    }
}
这是在pictureBox1上画的你可以试着修改下