# region 图像处理功能函数
/// <summary> /// 按指定尺寸对图像pic进行非拉伸缩放 /// </summary> public static Bitmap shrinkTo(Image pic, Size S, Boolean cutting) { //创建图像 Bitmap tmp = new Bitmap(S.Width, S.Height); //按指定大小创建位图
//绘制 Graphics g = Graphics.FromImage(tmp); //从位图创建Graphics对象 g.Clear(Color.FromArgb(0, 0, 0, 0)); //清空
Boolean mode = (float)pic.Width / S.Width > (float)pic.Height / S.Height; //zoom缩放 if (cutting) mode = !mode; //裁切缩放
//计算Zoom绘制区域 if (mode) S.Height = (int)((float)pic.Height * S.Width / pic.Width); else S.Width = (int)((float)pic.Width * S.Height / pic.Height); Point P = new Point((tmp.Width - S.Width) / 2, (tmp.Height - S.Height) / 2);
g.DrawImage(pic, new Rectangle(P, S));
return tmp; //返回构建的新图像 }
[DllImport("user32.dll")] static extern bool GetCursorInfo(out CURSORINFO pci);
private const Int32 CURSOR_SHOWING = 0x00000001; [StructLayout(LayoutKind.Sequential)] struct POINT { public Int32 x; public Int32 y; }
[StructLayout(LayoutKind.Sequential)] struct CURSORINFO { public Int32 cbSize; public Int32 flags; public IntPtr hCursor; public POINT ptScreenPos; }
/// <summary> /// 截取屏幕指定区域为Image,保存到路径savePath下,haveCursor是否包含鼠标 /// </summary> public static Image getScreen(int x=0, int y=0, int width=-1, int height=-1, String savePath="", bool haveCursor = true) { if (width == -1) width = SystemInformation.VirtualScreen.Width; if (height == -1) height = SystemInformation.VirtualScreen.Height;
Bitmap tmp = new Bitmap(width, height); //按指定大小创建位图 Graphics g = Graphics.FromImage(tmp); //从位图创建Graphics对象 g.CopyFromScreen(x, y, 0, 0, new Size(width, height)); //绘制
// 绘制鼠标 if (haveCursor) { CURSORINFO pci; pci.cbSize = Marshal.SizeOf(typeof(CURSORINFO)); GetCursorInfo(out pci); System.Windows.Forms.Cursor cur = new System.Windows.Forms.Cursor(pci.hCursor); cur.Draw(g, new Rectangle(pci.ptScreenPos.x, pci.ptScreenPos.y, cur.Size.Width, cur.Size.Height)); }
if (!savePath.Equals("")) saveIcon(tmp, tmp.Size, savePath); // 保存到指定的路径下
return tmp; //返回构建的新图像 }
//在图像pic上添加logo public static Bitmap SetLogo(Image pic, Image logo) { //创建图像 Bitmap tmp = new Bitmap(pic.Width, pic.Height);//按指定大小创建位图
//绘制 Graphics g = Graphics.FromImage(tmp); //从位图创建Graphics对象 g.Clear(Color.FromArgb(0, 0, 0, 0)); //清空
g.DrawImage(pic, 0, 0); //从pic的给定区域进行绘制 g.DrawImage(logo, 0, 0); //为图像添加logo
return tmp; //返回构建的新图像 }
//保存图像pic到文件fileName中,指定图像保存格式 public static void SaveToFile(Image pic, string fileName, bool replace, ImageFormat format) //ImageFormat.Jpeg { //若图像已存在,则删除 if (System.IO.File.Exists(fileName) && replace) System.IO.File.Delete(fileName);
//若不存在则创建 if (!System.IO.File.Exists(fileName)) { if (format == null) format = getFormat(fileName); //根据拓展名获取图像的对应存储类型
if (format == ImageFormat.MemoryBmp) pic.Save(fileName); else pic.Save(fileName, format); //按给定格式保存图像 } }
//根据文件拓展名,获取对应的存储类型 public static ImageFormat getFormat(string filePath) { ImageFormat format = ImageFormat.MemoryBmp; String Ext = System.IO.Path.GetExtension(filePath).ToLower();
if (Ext.Equals(".png")) format = ImageFormat.Png; else if (Ext.Equals(".jpg") || Ext.Equals(".jpeg")) format = ImageFormat.Jpeg; else if (Ext.Equals(".bmp")) format = ImageFormat.Bmp; else if (Ext.Equals(".gif")) format = ImageFormat.Gif; else if (Ext.Equals(".ico")) format = ImageFormat.Icon; else if (Ext.Equals(".emf")) format = ImageFormat.Emf; else if (Ext.Equals(".exif")) format = ImageFormat.Exif; else if (Ext.Equals(".tiff")) format = ImageFormat.Tiff; else if (Ext.Equals(".wmf")) format = ImageFormat.Wmf; else if (Ext.Equals(".memorybmp")) format = ImageFormat.MemoryBmp;
return format; }
# endregion
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