一、各種旋轉(zhuǎn)、改變大小注意：先要添加畫(huà)圖相關(guān)的using引用。//向右旋轉(zhuǎn)圖像90°代碼如下:PRivate void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");//加載圖像g.FillRectangle(Brushes.White, this.ClientRectangle);//填充窗體背景為白色Point[] destinationPoints = {new Point(100, 0), // destination for upper-left point of originalnew Point(100, 100),// destination for upper-right point of originalnew Point(0, 0)}; // destination for lower-left point of originalg.DrawImage(bmp, destinationPoints);}//旋轉(zhuǎn)圖像180°代碼如下:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);Point[] destinationPoints = {new Point(0, 100), // destination for upper-left point of originalnew Point(100, 100),// destination for upper-right point of originalnew Point(0, 0)}; // destination for lower-left point of originalg.DrawImage(bmp, destinationPoints);}//圖像切變代碼:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);Point[] destinationPoints = {new Point(0, 0), // destination for upper-left point of originalnew Point(100, 0), // destination for upper-right point of originalnew Point(50, 100)};// destination for lower-left point of originalg.DrawImage(bmp, destinationPoints);}//圖像截取:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);Rectangle sr = new Rectangle(80, 60, 400, 400);//要截取的矩形區(qū)域Rectangle dr = new Rectangle(0, 0, 200, 200);//要顯示到Form的矩形區(qū)域g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel);}//改變圖像大小:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);int width = bmp.Width;int height = bmp.Height;// 改變圖像大小使用低質(zhì)量的模式g.InterpolationMode = InterpolationMode.NearestNeighbor;g.DrawImage(bmp, new Rectangle(10, 10, 120, 120), // source rectanglenew Rectangle(0, 0, width, height), // destination rectangleGraphicsUnit.Pixel);// 使用高質(zhì)量模式//g.CompositingQuality = CompositingQuality.HighSpeed;g.InterpolationMode = InterpolationMode.HighQualityBicubic;g.DrawImage(bmp,new Rectangle(130, 10, 120, 120), new Rectangle(0, 0, width, height),GraphicsUnit.Pixel);}//設(shè)置圖像的分辯率:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);bmp.SetResolution(300f, 300f);g.DrawImage(bmp, 0, 0);bmp.SetResolution(1200f, 1200f);g.DrawImage(bmp, 180, 0);}//用GDI+畫(huà)圖private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics gForm = e.Graphics;gForm.FillRectangle(Brushes.White, this.ClientRectangle);for (int i = 1; i <= 7; ++i){//在窗體上面畫(huà)出橙色的矩形Rectangle r = new Rectangle(i*40-15, 0, 15,this.ClientRectangle.Height);gForm.FillRectangle(Brushes.Orange, r);}//在內(nèi)存中創(chuàng)建一個(gè)Bitmap并設(shè)置CompositingModeBitmap bmp = new Bitmap(260, 260,System.Drawing.Imaging.PixelFormat.Format32bppArgb);Graphics gBmp = Graphics.FromImage(bmp);gBmp.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;// 創(chuàng)建一個(gè)帶有Alpha的紅色區(qū)域// 并將其畫(huà)在內(nèi)存的位圖里面Color red = Color.FromArgb(0x60, 0xff, 0, 0);Brush redBrush = new SolidBrush(red);gBmp.FillEllipse(redBrush, 70, 70, 160, 160);// 創(chuàng)建一個(gè)帶有Alpha的綠色區(qū)域Color green = Color.FromArgb(0x40, 0, 0xff, 0);Brush greenBrush = new SolidBrush(green);gBmp.FillRectangle(greenBrush, 10, 10, 140, 140);//在窗體上面畫(huà)出位圖 now draw the bitmap on our windowgForm.DrawImage(bmp, 20, 20, bmp.Width, bmp.Height);// 清理資源bmp.Dispose();gBmp.Dispose();redBrush.Dispose();greenBrush.Dispose();}//在窗體上面繪圖并顯示圖像private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Pen blackPen = new Pen(Color.Black, 1);if (ClientRectangle.Height / 10 > 0){for (int y = 0; y < ClientRectangle.Height; y += ClientRectangle.Height / 10){g.DrawLine(blackPen, new Point(0, 0), new Point(ClientRectangle.Width, y));}}blackPen.Dispose();} C# 使用Bitmap類進(jìn)行圖片裁剪  在Mapwin（手機(jī)游戲地圖編輯器）生成的地圖txt文件中添加自己需要處理的數(shù)據(jù)后轉(zhuǎn)換成可在手機(jī)（Ophone）開(kāi)發(fā)環(huán)境中使用的字節(jié)流地圖文件的小工具，其中就涉及到圖片的裁剪和生成了。有以下幾種方式。 方法一：拷貝像素。 當(dāng)然這種方法是最笨的，效率也就低了些。在Bitmap類中我們可以看到這樣兩個(gè)方法：GetPixel（int x, int y）和SetPixel（int x, int y, Color color）方法。從字面的含以上就知道前者是獲取圖像某點(diǎn)像素值，是用Color對(duì)象返回的；后者是將已知像素描畫(huà)到制定的位置。下面就來(lái)做個(gè)實(shí)例檢驗(yàn)下：1.首先創(chuàng)建一個(gè)Windows Form窗體程序，往該窗體上拖放7個(gè)PictureBox控件，第一個(gè)用于放置并顯示原始的大圖片，其后6個(gè)用于放置并顯示裁剪后新生成的6個(gè)小圖；2.放置原始大圖的PictureBox控件name屬性命名為pictureBoxBmpRes，其后pictureBox1到pictureBox6依次命名，并放置在合適的位置；3.雙擊Form窗體，然后在Form1_Load事件中加入下面的代碼即可。//導(dǎo)入圖像資源            Bitmap bmpRes = null;            String strPath = application.ExecutablePath;            try{                int nEndIndex = strPath.LastIndexOf('//');                strPath = strPath.Substring(0,nEndIndex) + "http://Bmp//BmpResMM.bmp";                bmpRes = new Bitmap(strPath);                 //窗體上顯示加載圖片                pictureBoxBmpRes.Width = bmpRes.Width;                pictureBoxBmpRes.Height = bmpRes.Height;                pictureBoxBmpRes.Image = bmpRes;            }            catch(Exception ex)            {               System.Windows.Forms.MessageBox.Show("圖片資源加載失敗！/r/n" + ex.ToString());            }             //裁剪圖片(裁成2行3列的6張圖片)            int nYClipNum = 2, nXClipNum = 3;            Bitmap[] bmpaClipBmpArr = new Bitmap[nYClipNum * nXClipNum];                        for (int nYClipNumIndex = 0; nYClipNumIndex < nYClipNum; nYClipNumIndex++)            {                for (int nXClipNumIndex = 0; nXClipNumIndex < nXClipNum; nXClipNumIndex++)                {                    int nClipWidth = bmpRes.Width / nXClipNum;                    int nClipHight = bmpRes.Height / nYClipNum;                    int nBmpIndex = nXClipNumIndex + nYClipNumIndex * nYClipNum + (nYClipNumIndex > 0?1:0);                    bmpaClipBmpArr[nBmpIndex] = new Bitmap(nClipWidth, nClipHight);                     for(int nY = 0; nY < nClipHight; nY++)                    {                        for(int nX = 0; nX < nClipWidth; nX++)                        {                            int nClipX = nX + nClipWidth * nXClipNumIndex;                            int nClipY = nY + nClipHight * nYClipNumIndex;                            Color cClipPixel = bmpRes.GetPixel(nClipX, nClipY);                            bmpaClipBmpArr[nBmpIndex].SetPixel(nX, nY, cClipPixel);                        }                    }                                   }            }            PictureBox[] picbShow = new PictureBox[nYClipNum * nXClipNum];            picbShow[0] = pictureBox1;            picbShow[1] = pictureBox2;            picbShow[2] = pictureBox3;            picbShow[3] = pictureBox4;            picbShow[4] = pictureBox5;            picbShow[5] = pictureBox6;            for (int nLoop = 0; nLoop < nYClipNum * nXClipNum; nLoop++)            {                picbShow[nLoop].Width = bmpRes.Width / nXClipNum;                picbShow[nLoop].Height = bmpRes.Height / nYClipNum;                picbShow[nLoop].Image = bmpaClipBmpArr[nLoop];                           } 現(xiàn)在看看那些地方需要注意的了。其中int nBmpIndex =nXClipNumIndex + nYClipNumIndex * nYClipNum + (nYClipNumIndex > 0?1:0); 這句定義了存儲(chǔ)裁剪圖片對(duì)象在數(shù)組中的索引，需要注意的就是后面的(nYClipNumIndex > 0?1:0)——因?yàn)橹挥挟?dāng)裁剪的對(duì)象處于第一行以外的行時(shí)需要將索引加1；另外，因?yàn)檫@種方法的效率不高，程序運(yùn)行起來(lái)還是頓了下。如果有興趣的話，可以將以上的代碼放到一個(gè)按鈕Click事件函數(shù)中，當(dāng)單擊該按鈕時(shí)就可以感覺(jué)到了。  方法二：運(yùn)用Clone函數(shù)局部復(fù)制。 同樣在Bitmap中可以找到Clone（）方法，該方法有三個(gè)重載方法。Clone（），Clone（Rectangle， PixelFormat）和Clone（RectangleF， PixelFormat）。第一個(gè)方法將創(chuàng)建并返回一個(gè)精確的實(shí)例對(duì)象，后兩個(gè)就是我們這里需要用的局部裁剪了（其實(shí)后兩個(gè)方法本人覺(jué)得用法上差不多）。將上面的程序稍稍改進(jìn)下——將裁剪的處理放到一個(gè)按鈕事件函數(shù)中，然后再托一個(gè)按鈕好窗體上，最后將下面的代碼復(fù)制到該按鈕的事件函數(shù)中。for (int nYClipNumIndex = 0; nYClipNumIndex < nYClipNum; nYClipNumIndex++){       for (int nXClipNumIndex = 0; nXClipNumIndex < nXClipNum; nXClipNumIndex++)         {              int nClipWidth = bmpRes.Width / nXClipNum;                      int nClipHight = bmpRes.Height / nYClipNum;