c#使用GDI+簡單繪圖

private void button2_Click(object sender, EventArgs e)
        {
            Bitmap image = new Bitmap(200, 200);
            Graphics g = Graphics.FromImage(image);
            //使繪圖品質最高，即消除鋸齒
            g.SmoothingMode = SmoothingMode.AntiAlias;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.CompositingQuality = CompositingQuality.HighQuality;
            Pen p = new Pen(Color.Blue, 2);//定義了一個藍色,寬度為的畫筆  
            g.DrawString("字元串", new Font("宋體", 10),  new SolidBrush(Color.Blue), new PointF(10, 10)); 
            g.DrawLine(p, 0, 0, 200, 200);//在畫闆上畫直線
            g.DrawRectangle(p, 0, 0, 200, 200);//在畫闆上畫矩形
            g.DrawEllipse(p, 0, 0, 200, 200);//在畫闆上畫橢圓 
            //儲存圖檔
            image.Save(@"c:\1.jpg");
            #region 顯示
            //pictureBox1.Image = (Image)image;
            //pictureBox1.Image.Save(@"c:\1.jpg");
            #endregion
        }

private void button2_Click(object sender, EventArgs e)
        {
            Bitmap image = new Bitmap(400, 800);
            Graphics g = Graphics.FromImage(image);
            //使繪圖品質最高，即消除鋸齒
            g.SmoothingMode = SmoothingMode.AntiAlias;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.CompositingQuality = CompositingQuality.HighQuality;
            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
            Pen p = new Pen(Color.Black, 5);//定義了黑色,寬度為5的畫筆  
            Pen p1 = new Pen(Color.Black, 2);//定義了黑色,寬度為2的畫筆 
            SolidBrush sb = new SolidBrush(Color.Black); //定義筆刷
            g.DrawString("測試", new Font("宋體", 18, FontStyle.Bold), sb, new PointF(20, 20));
            g.DrawString("GSM 數字行動電話機", new Font("宋體", 10), sb, new PointF(120, 30));
            g.DrawString("黑色   台", new Font("宋體", 12, FontStyle.Bold), sb, new PointF(300, 25));
            g.DrawRectangle(p, 0, 0, 400, 800);//在畫闆上畫外框矩形
            g.DrawLine(p1, 20, 50, 380, 50);//在畫闆上畫直線  
            g.DrawRectangle(p1, 20, 120, 360, 650);//在畫闆上畫内框矩形

            //粘貼本地條碼圖檔到畫闆
            Image image1 = Image.FromFile(@"c:\barcode.gif");
            g.DrawImage(image1, 20, 60, image1.Width / 2, image1.Height / 2);

            int heightC = 90; //起始Y坐标
            int heightH = 60; //IMEI行間距
            int imeiCount = 20; //循環IMEI數
            int rows = imeiCount / 2; //行數
            for (int i = 1; i <= rows; i++)
            {
                g.DrawImage(image1, 40, heightC + (heightH * i), image1.Width / 2, image1.Height / 2);
                g.DrawImage(image1, 220, heightC + (heightH * i), image1.Width / 2, image1.Height / 2);
            }
            image1.Dispose();
            g.Dispose();

            //儲存圖檔
            image.Save(@"c:\1.jpg");
            #region 顯示
            //pictureBox1.Image = (Image)image;
            //pictureBox1.Image.Save(@"c:\1.jpg");
            #endregion
        }

private void Form1_Paint(object sender, PaintEventArgs e)
{
	Graphics g = e.Graphics; //建立畫闆,這裡的畫闆是由Form提供的.
	Pen p = new Pen(Color.Blue, 2);//定義了一個藍色,寬度為的畫筆
	g.DrawLine(p, 10, 10, 100, 100);//在畫闆上畫直線,起始坐标為(10,10),終點坐标為(100,100)
	g.DrawRectangle(p, 10, 10, 100, 100);//在畫闆上畫矩形,起始坐标為(10,10),寬為,高為
	g.DrawEllipse(p, 10, 10, 100, 100);//在畫闆上畫橢圓,起始坐标為(10,10),外接矩形的寬為,高為

	/*
		Pen  p = new  Pen(Color.Blue, 5);//設定筆的粗細為,顔色為藍色
		Graphics  g = this.CreateGraphics();

		//畫虛線
		p.DashStyle = DashStyle.Dot;//定義虛線的樣式為點
		g.DrawLine(p, 10, 10, 200, 10);

		//自定義虛線
		p.DashPattern = new  float[] { 2, 1 };//設定短劃線和空白部分的數組
		g.DrawLine(p, 10, 20, 200, 20);

		//畫箭頭,隻對不封閉曲線有用
		p.DashStyle = DashStyle.Solid;//恢複實線
		p.EndCap = LineCap.ArrowAnchor;//定義線尾的樣式為箭頭
		g.DrawLine(p, 10, 30, 200, 30);

		g.Dispose();
		p.Dispose();
	 */

	/*
		Graphics g = this.CreateGraphics();
		Rectangle rect = new Rectangle(10, 10, 50, 50);//定義矩形,參數為起點橫縱坐标以及其長和寬

		//單色填充
		SolidBrush b1 = new SolidBrush(Color.Blue);//定義單色畫刷          
		g.FillRectangle(b1, rect);//填充這個矩形

		//字元串
		g.DrawString("字元串", new Font("宋體", 10), b1, new PointF(90, 10));

		//用圖檔填充
		TextureBrush b2 = new TextureBrush(Image.FromFile(@"e:\picture\1.jpg"));
		rect.Location = new Point(10, 70);//更改這個矩形的起點坐标
		rect.Width = 200;//更改這個矩形的寬來
		rect.Height = 200;//更改這個矩形的高
		g.FillRectangle(b2, rect);

		//用漸變色填充
		rect.Location = new Point(10, 290);
		LinearGradientBrush b3 = new  LinearGradientBrush(rect, Color.Yellow , Color.Black , LinearGradientMode.Horizontal);
		g.FillRectangle(b3, rect);	
	*/
}


/*
    C#仿QQ截圖
    接下來看看這是如何做到的.　
　　思路:聊天窗體上有一個截圖按鈕,點選按鈕後,程式将整個螢幕畫在一個新的全屏窗體上,
    然後顯示這個窗體.因為是全屏的窗體,并且隐藏了菜單欄、工具欄等,
	是以在我們看來就好像是一個桌面的截圖,然後在這個新窗體上畫矩形,
	最後儲存矩形中的内容并顯示在原來的聊天窗體中.
　　步驟:
　　A.建立一個窗體．命名為Catch.然後設定這個窗體的FormBorderStyle為None,WindowState為Maximized．
　　B.我們對代碼進行編輯：
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Client
{
    public partial class Catch : Form
    {
        public Catch()
        {
            InitializeComponent();
        }

        #region 使用者變量
        private Point DownPoint = Point.Empty;//記錄滑鼠按下坐标，用來确定繪圖起點
        private bool CatchFinished = false;//用來表示是否截圖完成
        private bool CatchStart = false;//表示截圖開始
        private Bitmap originBmp;//用來儲存原始圖像
        private Rectangle CatchRect;//用來儲存截圖的矩形
        #endregion

        //窗體初始化操作
        private void Catch_Load(object sender, EventArgs e)
        {
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
            this.UpdateStyles();
            //以上兩句是為了設定控件樣式為雙緩沖，這可以有效減少圖檔閃爍的問題，關于這個大家可以自己去搜尋下
            originBmp = new Bitmap(this.BackgroundImage);//BackgroundImage為全屏圖檔，我們另用變量來儲存全屏圖檔
        }

        //滑鼠右鍵點選結束截圖
        private void Catch_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
        }

        //滑鼠左鍵按下時動作
        private void Catch_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (!CatchStart)
                {//如果捕捉沒有開始
                    CatchStart = true;
                    DownPoint = new Point(e.X, e.Y);//儲存滑鼠按下坐标
                }
            }
        }

        private void Catch_MouseMove(object sender, MouseEventArgs e)
        {
            if (CatchStart)
            {//如果捕捉開始
                Bitmap destBmp = (Bitmap)originBmp.Clone();//建立一個圖檔對象，并讓它與原始圖檔相同
                Point newPoint = new Point(DownPoint.X, DownPoint.Y);//擷取滑鼠的坐标
                Graphics g = Graphics.FromImage(destBmp);//在剛才建立的圖檔上建立一個畫闆
                Pen p = new Pen(Color.Blue,1);
                int width = Math.Abs(e.X - DownPoint.X), height = Math.Abs(e.Y - DownPoint.Y);//擷取矩形的長和寬
                if (e.X < DownPoint.X)
                {
                    newPoint.X = e.X;
                }
                if (e.Y < DownPoint.Y)
                {
                    newPoint.Y = e.Y;
                }
                CatchRect = new Rectangle(newPoint,new Size(width,height));//儲存矩形
                g.DrawRectangle(p,CatchRect);//将矩形畫在這個畫闆上
                g.Dispose();//釋放目前的這個畫闆
                p.Dispose();
                Graphics g1 = this.CreateGraphics();//重新建立一個Graphics類
                //如果之前那個畫闆不釋放，而直接g=this.CreateGraphics()這樣的話無法釋放掉第一次建立的g,因為隻是把位址轉到新的g了．如同string一樣
                g1 = this.CreateGraphics();//在整個全屏窗體上建立畫闆
                g1.DrawImage(destBmp,new Point(0,0));//将剛才所畫的圖檔畫到這個窗體上
                //這個也可以屬于二次緩沖技術，如果直接将矩形畫在窗體上，會造成圖檔抖動并且會有無數個矩形．
                g1.Dispose();
                destBmp.Dispose();//要及時釋放，不然記憶體将會被大量消耗
                
            }
        }

        private void Catch_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (CatchStart)
                {
                    CatchStart = false;
                    CatchFinished = true;
                  
                }
            }
        }

        //滑鼠輕按兩下事件，如果滑鼠位于矩形内，則将矩形内的圖檔儲存到剪貼闆中
        private void Catch_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left&&CatchFinished)
            {
                if (CatchRect.Contains(new Point(e.X, e.Y)))
                {
                    Bitmap CatchedBmp = new Bitmap(CatchRect.Width, CatchRect.Height);//建立一個于矩形等大的空白圖檔
                    Graphics g = Graphics.FromImage(CatchedBmp);
                    g.DrawImage(originBmp, new Rectangle(0, 0, CatchRect.Width, CatchRect.Height), CatchRect, GraphicsUnit.Pixel);
                    //把orginBmp中的指定部分按照指定大小畫在畫闆上
                    Clipboard.SetImage(CatchedBmp);//将圖檔儲存到剪貼闆
                    g.Dispose();
                    CatchFinished = false;
                    this.BackgroundImage = originBmp;
                    CatchedBmp.Dispose();
                    this.DialogResult = DialogResult.OK;
                    this.Close();
                }
            }
        }
    }
}

/*
C.建立了Catch窗體後，我們在截圖按鈕(位于聊天窗體上)上加入以下事件：
*/
private void bCatch_Click(object sender, EventArgs e)
{

	if (bCatch_HideCurrent.Checked)
	{
		this.Hide();//隐藏目前窗體
		Thread.Sleep(50);//讓線程睡眠一段時間，窗體消失需要一點時間
		Catch CatchForm = new Catch();
		Bitmap CatchBmp = new Bitmap(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height);//建立一個和螢幕大小相同的圖檔         
		Graphics g = Graphics.FromImage(CatchBmp);
		g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height));//儲存全屏圖檔
		CatchForm.BackgroundImage = CatchBmp;//将Catch窗體的背景設為全屏時的圖檔
		if (CatchForm.ShowDialog() == DialogResult.OK)
		{//如果Catch窗體結束,就将剪貼闆中的圖檔放到資訊發送框中
			IDataObject iData = Clipboard.GetDataObject();
			DataFormats.Format myFormat = DataFormats.GetFormat(DataFormats.Bitmap);
			if (iData.GetDataPresent(DataFormats.Bitmap))
			{
				richtextbox1.Paste(myFormat);
				Clipboard.Clear();//清除剪貼闆中的對象
			}
			this.Show();//重新顯示窗體
		}
	}
}

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