绘图方法（把你们能想出的绘图方法都交出来吧）

newtee 2012-08-10 10:15:13

抛砖引玉：



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;



namespace WindowsFormsApplication2

{

    public partial class Form1 : Form

    {

        private bool ismousedown = false;//开始画图

        private PointF startposition;

        private PointF nowposition;

        private Image img;

        private Image image;

        private Pen pen;

        private Graphics g;



        public Form1()

        {

            InitializeComponent();

            SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);

            this.UpdateStyles();

            img = new Bitmap(this.Width, this.Height);

            image = new Bitmap(this.Width,this.Height);

            pen = new Pen(Color.Red, 2);

        }



        private void Form1_MouseDown(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left)

            {

                ismousedown = true;

                startposition.X = e.X;

                startposition.Y = e.Y;

            }

        }



        private void Form1_MouseMove(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left)

            {

                

                if (ismousedown)

                {

                    nowposition.X = e.X;

                    nowposition.Y = e.Y;

                    g = Graphics.FromImage(img);

                    g.Clear(Color.WhiteSmoke);

                    g.DrawImage(image, 0, 0);

                    g.DrawRectangle(pen,Math.Min(nowposition.X,startposition.X),Math.Min(nowposition.Y,startposition.Y),Math.Abs(nowposition.X -startposition.X ),Math.Abs(nowposition.Y-startposition.Y));

                    g.Dispose();

                    Graphics graphcis = this.CreateGraphics();

                    graphcis.DrawImage(img, 0, 0);

                    graphcis.Dispose();

                }              

            }

        }



        private void Form1_MouseUp(object sender, MouseEventArgs e)

        {

            ismousedown = false;

            g = Graphics.FromImage(image);

            g.DrawImage(img, 0, 0);

            g.Dispose();

        }   

    }

}

类似此方法你可以画出你想要的图片（直线，椭圆等等）,潜水去了。大家玩吧！祝上班的同志工作顺利，上学的孩子学习进步。