C#图片处理类
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Drawing.Drawing2D;
namespace Silent.Web.Controllers.Common
{
/**//// <summary>
/// ASPJpegBase
/// Author : Jolly
/// </summary>
public class ASPJpegBase : IDisposable
{
/**//// <summary>
/// 会产生graphics异常的PixelFormat
/// </summary>
private static PixelFormat[] indexedPixelFormats = { PixelFormat.Undefined, PixelFormat.DontCare, PixelFormat.Format16bppArgb1555, PixelFormat.Format1bppIndexed, PixelFormat.Format4bppIndexed, PixelFormat.Format8bppIndexed };
/**//// <summary>
/// 图片宽度--生成缩略图时使用
/// </summary>
public int Width { get; set; }
/**//// <summary>
/// 图片高度--生成缩略图时使用
/// </summary>
public int Height { get; set; }
/**//// <summary>
/// Bitmap对象
/// </summary>
public Bitmap CurrentBitmap
{
get { if (oCurrentImage == null) throw new NullReferenceException("CurrentBitmap is null!"); return oCurrentImage; }
}
private Bitmap oCurrentImage;
private ASPJpegEffect etASPJpegEffect;
/**//// <summary>
/// 图片特效处理
/// </summary>
public ASPJpegEffect Effect
{
get
{
etASPJpegEffect = new ASPJpegEffect();
etASPJpegEffect.CurrentBitmap = this.CurrentBitmap;
return etASPJpegEffect;
}
}
/**//// <summary>
/// 默认构造函数
/// </summary>
public ASPJpegBase()
{
}
/**//// <summary>
/// 构造函数
/// </summary>
/// <param name="sImagePath">图片路径</param>
public ASPJpegBase(string sImagePath)
{
oCurrentImage = new Bitmap(sImagePath);
//如果原图片是索引像素格式之列的，则需要转换
if (IsPixelFormatIndexed(oCurrentImage.PixelFormat))
{
using(Bitmap bmp = new Bitmap(oCurrentImage.Width, oCurrentImage.Height, PixelFormat.Format32bppArgb))
{
using (Graphics g = Graphics.FromImage(bmp))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.DrawImage(oCurrentImage, 0, 0);
}
oCurrentImage = (Bitmap)bmp.Clone();
}
}
}
/**//// <summary>
/// 构造函数
/// </summary>
/// <param name="oImage">Image对象</param>
public ASPJpegBase(Image oImage)
{
oCurrentImage = new Bitmap(oImage);
}
/**//// <summary>
/// 实例化Bitmap对象
/// </summary>
/// <param name="sImagePath">图片路径</param>
public void Open(string sImagePath)
{
oCurrentImage = new Bitmap(sImagePath);
}
/**//// <summary>
/// 判断图片的PixelFormat 是否在 引发异常的 PixelFormat 之中
/// 无法从带有索引像素格式的图像创建graphics对象
/// </summary>
/// <param name="imgPixelFormat">原图片的PixelFormat</param>
/// <returns></returns>
private static bool IsPixelFormatIndexed(PixelFormat imgPixelFormat)
{
foreach (PixelFormat pf in indexedPixelFormats)
{
if (pf.Equals(imgPixelFormat)) return true;
}
return false;
}
/**//// <summary>
/// 添加文字水印
/// </summary>
/// <param name="text"></param>
/// <param name="p"></param>
/// <param name="fontcolor"></param>
/// <param name="font"></param>
public void DrawText(string sText, Font font, Color fontcolor, Point p, float rotate)
{
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
if (rotate != 0)
graphics.RotateTransform(rotate);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.DrawString(sText, font, new SolidBrush(fontcolor), (float)p.X, (float)p.Y);
}
}
/**//// <summary>
/// 添加文字水印-文字带背景
/// </summary>
/// <param name="text"></param>
/// <param name="p"></param>
/// <param name="fontcolor"></param>
/// <param name="font"></param>
public void DrawText(string sText, Font font, Color fontcolor, Point p, float rotate, string sImagePath)
{
TextureBrush tb = new TextureBrush(Image.FromFile(sImagePath));
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
if (rotate != 0)
graphics.RotateTransform(rotate);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.DrawString(sText, font, tb, (float)p.X, (float)p.Y);
}
}
/**//// <summary>
/// 绘制边框
/// </summary>
/// <param name="frameColor">边框颜色</param>
/// <param name="frameWidth">边框宽度</param>
public void DrawFrame(Color frameColor, int frameWidth)
{
double iNewframeWidth = (Convert.ToDouble(frameWidth) / Convert.ToDouble(2));
using (Bitmap newBitmap = new Bitmap(this.CurrentBitmap.Width + (2 * frameWidth), this.CurrentBitmap.Height + (2 * frameWidth)))
{
using (Graphics graphics = Graphics.FromImage(newBitmap))
{
graphics.Clear(Color.White);
Pen pen = new Pen(frameColor, frameWidth);
graphics.DrawRectangle(pen, (float)iNewframeWidth, (float)iNewframeWidth, newBitmap.Width - frameWidth, newBitmap.Height - frameWidth);
graphics.DrawImage(this.CurrentBitmap, new Rectangle(frameWidth, frameWidth,this.CurrentBitmap.Width,this.CurrentBitmap.Height));
this.oCurrentImage = ((Bitmap)newBitmap.Clone());
}
}
}
/**//// <summary>
/// 绘制3D边框
/// </summary>
/// <param name="frameColor">边框颜色</param>
/// <param name="frameWidth">边框宽度</param>
public void Draw3DFrame(Color frameColor, int frameWidth)
{
double iNewframeWidth = (Convert.ToDouble(frameWidth) / Convert.ToDouble(2));
using (Bitmap newBitmap = new Bitmap(this.CurrentBitmap.Width + (2 * frameWidth), this.CurrentBitmap.Height + (2 * frameWidth)))
{
using (Graphics graphics = Graphics.FromImage(newBitmap))
{
graphics.Clear(Color.White);
Pen pen = new Pen(frameColor, (float)iNewframeWidth);
Pen pen1 = new Pen(Color.FromArgb(frameColor.ToArgb() - 10), (float)iNewframeWidth);
graphics.DrawRectangle(pen, (float)iNewframeWidth / 2, (float)iNewframeWidth / 2, newBitmap.Width - (float)iNewframeWidth, newBitmap.Height - (float)iNewframeWidth);
graphics.DrawRectangle(pen1, 3 * (float)iNewframeWidth / 2, 3 * (float)iNewframeWidth / 2, newBitmap.Width - 3 * (float)iNewframeWidth, newBitmap.Height - 3 * (float)iNewframeWidth);
graphics.DrawImage(this.CurrentBitmap, 2 * (float)iNewframeWidth, 2 * (float)iNewframeWidth, (float)this.CurrentBitmap.Width, (float)this.CurrentBitmap.Height);
this.oCurrentImage = (Bitmap)newBitmap.Clone();
}
}
}
/**//// <summary>
/// 图片切割功能
/// </summary>
/// <param name="left">left</param>
/// <param name="top">top</param>
/// <param name="right">right</param>
/// <param name="bottom">bottom</param>
public void Crop(int left, int top, int right, int bottom)
{
int num;
int num2;
if ((this.CurrentBitmap.Width - left) < right)
{
num = this.CurrentBitmap.Width - right;
}
else
{
num = right;
}
if ((this.CurrentBitmap.Height - top) < bottom)
{
num2 = this.CurrentBitmap.Height - top;
}
else
{
num2 = bottom;
}
using (Bitmap image = new Bitmap(num, num2))
{
image.SetResolution(this.CurrentBitmap.HorizontalResolution, this.CurrentBitmap.VerticalResolution);
using (Graphics graphics = Graphics.FromImage(image))
{
graphics.Clear(Color.White);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.DrawImage(this.CurrentBitmap, new Rectangle(0, 0, num, num2), new Rectangle(left, top, num, num2), GraphicsUnit.Pixel);
oCurrentImage = (Bitmap)image.Clone();
}
}
}
/**//// <summary>
/// 图片移动
/// </summary>
/// <param name="lefttopx"></param>
/// <param name="lefttopy"></param>
/// <param name="rightbottomx"></param>
/// <param name="rightbottomy"></param>
/// <param name="tox"></param>
/// <param name="toy"></param>
public void Move(int lefttopx, int lefttopy, int rightbottomx, int rightbottomy, int tox, int toy)
{
using (Bitmap image = this.Copy(lefttopx, lefttopy, rightbottomx, rightbottomy))
{
Rectangle rect = GetRectangle(lefttopx, lefttopy, rightbottomx, rightbottomy);
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
graphics.Clear(Color.White);
graphics.FillRectangle(new SolidBrush(Color.White), rect);
graphics.DrawImage(image, tox, toy);
oCurrentImage = (Bitmap)image.Clone();
}
}
}
/**//// <summary>
/// 调整图片大小
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
public void ResizeTo(int width, int height)
{
this.oCurrentImage = new Bitmap(this.CurrentBitmap, width, height);
}
/**//// <summary>
/// 生成缩略图
/// </summary>
public void CreateThumbnail(int iWidth, int iHeight)
{
//用指定的大小和格式初始化 Bitmap 类的新实例
using (Bitmap bitmap = (Bitmap)oCurrentImage.Clone())
{
ResizeTo(iWidth, iHeight);
//在指定位置并且按指定大小绘制 原图片 对象
Graphics.FromImage(oCurrentImage).DrawImage(bitmap, new Rectangle(0, 0, iWidth, iHeight));
}
}
/**//// <summary>
/// 生成缩略图
/// </summary>
/// <param name="sThumbnailPath">缩略图保存路径</param>
public void CreateThumbnail(string sThumbnailPath)
{
if (Width > 0 && Height > 0 && (Width < oCurrentImage.Width || Height < oCurrentImage.Height))
{
int width = Width;
int height = Height;
double factor = 1;
if (oCurrentImage.Width > oCurrentImage.Height)
{
factor = Convert.ToDouble(width) / Convert.ToDouble(oCurrentImage.Width);
height = Convert.ToInt32(oCurrentImage.Height * factor);
}
else
{
factor = Convert.ToDouble(height) / Convert.ToDouble(oCurrentImage.Height);
width = Convert.ToInt32(oCurrentImage.Width * factor);
}
//用指定的大小和格式初始化 Bitmap 类的新实例
Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
//从指定的 Image 对象创建新 Graphics 对象
Graphics graphics = Graphics.FromImage(bitmap);
//清除整个绘图面并以透明背景色填充
graphics.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制 原图片 对象
graphics.DrawImage(oCurrentImage, new Rectangle(0, 0, width, height));
try
{
bitmap.Save(sThumbnailPath);
}
catch (System.Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}
}
}
/**//// <summary>
/// 图片垂直翻转
/// </summary>
public void FlipV()
{
this.CurrentBitmap.RotateFlip(RotateFlipType.RotateNoneFlipX);
}
/**//// <summary>
/// 图片水平翻转
/// </summary>
public void FlipH()
{
this.CurrentBitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);
}
/**//// <summary>
/// 图片旋转
/// </summary>
/// <param name="angle">旋转度数</param>
public void Rotate(int angle)
{
angle = angle % 360;
if (angle < 0)
{
angle += 360;
}
if (angle >= 270)
{
this.CurrentBitmap.RotateFlip(RotateFlipType.Rotate270FlipNone);
angle -= 270;
}
else if (angle >= 180)
{
this.CurrentBitmap.RotateFlip(RotateFlipType.Rotate180FlipNone);
angle -= 180;
}
else if (angle >= 90)
{
this.CurrentBitmap.RotateFlip(RotateFlipType.Rotate90FlipNone);
angle -= 90;
}
if (angle > 0)
{
double a = (angle * 3.1415926535897931) / 180.0;
int width = Convert.ToInt32((double)((this.CurrentBitmap.Height * Math.Sin(a)) + (this.CurrentBitmap.Width * Math.Cos(a))));
int height = Convert.ToInt32((double)((this.CurrentBitmap.Width * Math.Sin(a)) + (this.CurrentBitmap.Height * Math.Cos(a))));
Bitmap image = new Bitmap(width, height * 2);
image.SetResolution(this.CurrentBitmap.HorizontalResolution, this.CurrentBitmap.VerticalResolution);
Graphics graphics = Graphics.FromImage(image);
graphics.Clear(Color.White);
Matrix matrix = new Matrix(1f, 0f, 0f, -1f, 0f, 0f);
matrix.Translate(0f, (float)this.CurrentBitmap.Height, MatrixOrder.Append);
graphics.Transform = matrix;
Matrix matrix2 = new Matrix();
matrix2.RotateAt((float)-angle, (PointF)new Point(0, 0), MatrixOrder.Append);
matrix2.Translate(0f, 0f, MatrixOrder.Append);
GraphicsPath path = new GraphicsPath();
Point[] points = new Point[] { new Point(0, this.CurrentBitmap.Height), new Point(this.CurrentBitmap.Width, this.CurrentBitmap.Height), new Point(0, 0) };
path.AddPolygon(points);
path.Transform(matrix2);
PointF[] pathPoints = path.PathPoints;
graphics.DrawImage(this.CurrentBitmap, pathPoints);
graphics.ResetTransform();
int num4 = this.CurrentBitmap.Height;
this.oCurrentImage = new Bitmap(width, height);
this.CurrentBitmap.SetResolution(image.HorizontalResolution, image.VerticalResolution);
using (Graphics newGraphics = Graphics.FromImage(this.CurrentBitmap))
{
newGraphics.Clear(Color.White);
newGraphics.DrawImage(image, new Rectangle(0, 0, width, height), new Rectangle(0, Convert.ToInt32((double)(num4 * (1.0 - Math.Cos(a)))), width, height), GraphicsUnit.Pixel);
image.Dispose();
graphics.Dispose();
path.Dispose();
}
}
}
/**//// <summary>
/// 画弧形
/// </summary>
/// <param name="r"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
/// <param name="startangle"></param>
/// <param name="sweepAngle"></param>
public void DrawArc(Rectangle r, int linewidth, Color linecolor, float startangle, float sweepAngle)
{
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
Pen pen = new Pen(linecolor, (float)linewidth);
graphics.DrawArc(pen, r, startangle, sweepAngle);
}
}
/**//// <summary>
/// 画椭圆
/// </summary>
/// <param name="r"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
/// <param name="fillcolor"></param>
public void DrawEllipse(Rectangle r, int linewidth, Color linecolor, Color fillcolor)
{
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
Pen pen = new Pen(linecolor, (float)linewidth);
graphics.DrawEllipse(pen, r);
if (fillcolor != Color.Empty)
{
graphics.FillEllipse(new SolidBrush(fillcolor), r);
}
}
}
/**//// <summary>
/// 画椭圆
/// </summary>
/// <param name="lefttop"></param>
/// <param name="rightbottom"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
/// <param name="fillcolor"></param>
public void DrawEllipse(Point lefttop, Point rightbottom, int linewidth, Color linecolor, Color fillcolor)
{
this.DrawEllipse(new Rectangle(lefttop.X, lefttop.Y, rightbottom.X - lefttop.X, rightbottom.Y - lefttop.Y), linewidth, linecolor, fillcolor);
}
/**//// <summary>
/// 画椭圆
/// </summary>
/// <param name="lefttopx"></param>
/// <param name="lefttopy"></param>
/// <param name="rightbottomx"></param>
/// <param name="rightbottomy"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
/// <param name="fillcolor"></param>
public void DrawEllipse(int lefttopx, int lefttopy, int rightbottomx, int rightbottomy, int linewidth, Color linecolor, Color fillcolor)
{
this.DrawEllipse(new Rectangle(lefttopx, lefttopy, rightbottomx - lefttopx, rightbottomy - lefttopy), linewidth, linecolor, fillcolor);
}
/**//// <summary>
/// 画图上图
/// </summary>
/// <param name="img"></param>
/// <param name="r"></param>
public void DrawImage(System.Drawing.Image img, Rectangle r)
{
Graphics.FromImage(this.CurrentBitmap).DrawImage(img, r);
}
/**//// <summary>
/// 画线
/// </summary>
/// <param name="pFrom"></param>
/// <param name="pTo"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
public void DrawLine(Point pFrom, Point pTo, int linewidth, Color linecolor)
{
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
Pen pen = new Pen(linecolor, (float)linewidth);
graphics.DrawLine(pen, pFrom, pTo);
}
}
/**//// <summary>
/// 画线
/// </summary>
/// <param name="fromx"></param>
/// <param name="fromy"></param>
/// <param name="tox"></param>
/// <param name="toy"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
public void DrawLine(int fromx, int fromy, int tox, int toy, int linewidth, Color linecolor)
{
this.DrawLine(new Point(fromx, fromy), new Point(tox, toy), linewidth, linecolor);
}
/**//// <summary>
/// 画多条线
/// </summary>
/// <param name="points"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
public void DrawLines(Point[] points, int linewidth, Color linecolor)
{
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
Pen pen = new Pen(linecolor, (float)linewidth);
graphics.DrawLines(pen, points);
}
}
/**//// <summary>
/// 画长方形
/// </summary>
/// <param name="r"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
/// <param name="fillcolor"></param>
public void DrawRectangle(Rectangle r, int linewidth, Color linecolor, Color fillcolor)
{
using (Graphics graphics = Graphics.FromImage(this.CurrentBitmap))
{
Pen pen = new Pen(linecolor, (float)linewidth);
graphics.DrawRectangle(pen, r);
if (fillcolor != Color.Empty)
{
graphics.FillRectangle(new SolidBrush(fillcolor), r);
}
}
}
/**//// <summary>
/// 画长方形
/// </summary>
/// <param name="lefttop"></param>
/// <param name="rightbottom"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
/// <param name="fillcolor"></param>
public void DrawRectangle(Point lefttop, Point rightbottom, int linewidth, Color linecolor, Color fillcolor)
{
this.DrawRectangle(new Rectangle(lefttop.X, lefttop.Y, rightbottom.X - lefttop.X, rightbottom.Y - lefttop.Y), linewidth, linecolor, fillcolor);
}
/**//// <summary>
/// 画长方形
/// </summary>
/// <param name="lefttopx"></param>
/// <param name="lefttopy"></param>
/// <param name="rightbottomx"></param>
/// <param name="rightbottomy"></param>
/// <param name="linewidth"></param>
/// <param name="linecolor"></param>
/// <param name="fillcolor"></param>
public void DrawRectangle(int lefttopx, int lefttopy, int rightbottomx, int rightbottomy, int linewidth, Color linecolor, Color fillcolor)
{
this.DrawRectangle(GetRectangle(lefttopx, lefttopy, rightbottomx, rightbottomy), linewidth, linecolor, fillcolor);
}
/**//// <summary>
/// 保存图片到内存中
/// </summary>
/// <param name="mms"></param>
/// <param name="RawFormat"></param>
public void Save(MemoryStream mms, ImageFormat RawFormat)
{
this.CurrentBitmap.Save(mms, RawFormat);
}
/**//// <summary>
/// 保存图片到文件流中
/// </summary>
/// <param name="mms"></param>
/// <param name="RawFormat"></param>
public void Save(Stream mms, ImageFormat RawFormat)
{
this.CurrentBitmap.Save(mms, RawFormat);
}
/**//// <summary>
/// 保存为Gif图片
/// </summary>
/// <param name="sSavePath"></param>
public void SaveGif(string sSavePath)
{
this.CurrentBitmap.Save(sSavePath, ImageFormat.Gif);
}
/**//// <summary>
/// 保存为jpg图片
/// </summary>
/// <param name="sSavePath"></param>
/// <param name="iQuantity">图片质量</param>
public void SaveJpeg(string sSavePath, int iQuantity)
{
ImageCodecInfo encoderInfo = GetEncoderInfo("image/jpeg");
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams = new EncoderParameters();
encoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)iQuantity);
this.CurrentBitmap.Save(sSavePath, encoderInfo, encoderParams);
encoderParams.Dispose();
}
/**//// <summary>
/// 保存为jpg图片
/// </summary>
/// <param name="sSavePath"></param>
/// <param name="iQuantity">图片质量</param>
public void SaveJpeg(Stream etStream, int iQuantity)
{
ImageCodecInfo encoderInfo = GetEncoderInfo("image/jpeg");
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams = new EncoderParameters();
encoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)iQuantity);
this.CurrentBitmap.Save(etStream, encoderInfo, encoderParams);
encoderParams.Dispose();
}
/**//// <summary>
/// 保存为jpg图片
/// </summary>
/// <param name="sSavePath"></param>
public void SaveJpeg(string sSavePath)
{
this.CurrentBitmap.Save(sSavePath, ImageFormat.Jpeg);
}
/**//// <summary>
/// 保存为png图片
/// </summary>
/// <param name="sSavePath"></param>
public void SavePNG(string sSavePath)
{
this.CurrentBitmap.Save(sSavePath, ImageFormat.Png);
}
/**//// <summary>
/// 保存当前图片对象，自动根据后缀名，保存图片。
/// </summary>
/// <param name="sSavePath"></param>
public void Save(string sSavePath)
{
if (sSavePath.EndsWith(".jpg"))
{
this.SaveJpeg(sSavePath, 80);
}
else if (sSavePath.EndsWith(".gif"))
{
this.SaveGif(sSavePath);
}
else if (sSavePath.EndsWith(".png"))
{
this.SavePNG(sSavePath);
}
else
{
this.CurrentBitmap.Save(sSavePath);
}
}
/**//// <summary>
/// 复制图片对象
/// </summary>
/// <param name="lefttopx"></param>
/// <param name="lefttopy"></param>
/// <param name="rightbottomx"></param>
/// <param name="rightbottomy"></param>
/// <returns></returns>
public Bitmap Copy(int lefttopx, int lefttopy, int rightbottomx, int rightbottomy)
{
Rectangle srcRect = GetRectangle(lefttopx, lefttopy, rightbottomx, rightbottomy);
using (Bitmap image = new Bitmap(srcRect.Width, srcRect.Height))
{
image.SetResolution(this.oCurrentImage.HorizontalResolution, this.oCurrentImage.VerticalResolution);
Graphics.FromImage(image).DrawImage(this.oCurrentImage, new Rectangle(1, 1, image.Width, image.Height), srcRect, GraphicsUnit.Pixel);
return (Bitmap)image.Clone();
}
}
/**//// <summary>
/// 获取校正后的长方形
/// </summary>
/// <param name="lefttopx"></param>
/// <param name="lefttopy"></param>
/// <param name="rightbottomx"></param>
/// <param name="rightbottomy"></param>
/// <returns></returns>
public static Rectangle GetRectangle(int lefttopx, int lefttopy, int rightbottomx, int rightbottomy)
{
if ((lefttopx >= rightbottomx) && (lefttopy >= rightbottomy))
{
return new Rectangle(rightbottomx, rightbottomy, lefttopx - rightbottomx, lefttopy - rightbottomy);
}
if ((lefttopx < rightbottomx) && (lefttopy >= rightbottomy))
{
return new Rectangle(lefttopx, rightbottomy, rightbottomx - lefttopx, lefttopy - rightbottomy);
}
if ((lefttopx >= rightbottomx) && (lefttopy < rightbottomy))
{
return new Rectangle(rightbottomx, lefttopy, lefttopx - rightbottomx, rightbottomy - lefttopy);
}
return new Rectangle(lefttopx, lefttopy, rightbottomx - lefttopx, rightbottomy - lefttopy);
}
/**//// <summary>
/// 获取编码信息
/// </summary>
/// <param name="mimeType"></param>
/// <returns></returns>
public static ImageCodecInfo GetEncoderInfo(string mimeType)
{
foreach (ImageCodecInfo info in ImageCodecInfo.GetImageEncoders())
{
if (info.MimeType == mimeType)
{
return info;
}
}
return null;
}
/**//// <summary>
/// 清空对象
/// </summary>
public void Dispose()
{
if (oCurrentImage != null)
oCurrentImage.Dispose();
GC.SuppressFinalize(this);
}
}
}
转自： http://www.cnblogs.com/wliang22/archive/2009/09/04/1560114.html
