Drawing 圖片處理

貌似小白 2013-04-19

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Drawing 圖片處理

分類： Asp.Net 2009-08-03 11:53 309人閱讀評論(0) 收藏舉報

/// <summary>
/// 圖片處理類
/// </summary>
public class PhotoUtility {
/// <summary>
/// 水印位置
/// </summary>
public enum Position {
TopLeft
,
TopRight
,
TopCenter
,
Middle
,
BottomLeft
,
BottomCenter
,
BottomRight
};
/// <summary>
/// 壓縮圖片
/// </summary>
/// <param name="sourceImage">原圖</param>
/// <param name="filename">原圖壓縮圖片的保存文件名 </param>
/// <param name="r">壓縮圖片大小，如果為0則不壓縮</param>
/// <param name="WaterString">水印文字信息</param>
/// <param name="F">水印文字字體,如果為null則系統(tǒng)設(shè)置默認(rèn)值</param>
/// <param name="brush">筆刷如果為null則系統(tǒng)設(shè)置為默認(rèn)值</param>
/// <param name="p">水印位置</param>
public static void Compress(Image sourceImage, string filename, int r, string WaterString, Font F, Brush brush, Position p)
{
int targetWidth = r;
int targetHeight = r;
//當(dāng)大于0的時候才壓縮
if (r > 0)
{
if (sourceImage.Height <= r && sourceImage.Width <= r)
{
targetHeight = sourceImage.Height;
targetWidth = sourceImage.Width;
}
else if (sourceImage.Height > sourceImage.Width)
{
targetWidth = sourceImage.Width * r / sourceImage.Height;
}
else
{
targetHeight = sourceImage.Height * r / sourceImage.Width;
}
}
else
{
targetHeight = sourceImage.Height;
targetWidth = sourceImage.Width;
}
//縮放圖片
Image targetImage = Image.FromHbitmap(new Bitmap(targetWidth, targetHeight, PixelFormat.Format32bppRgb).GetHbitmap());
Graphics g = Graphics.FromImage(targetImage);
//設(shè)置縮略圖的平滑度及質(zhì)量
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.DrawImage(sourceImage, 0, 0, targetWidth, targetHeight);
//水印文字
if (WaterString!=null && WaterString != string.Empty){
F = (F == null ? new Font("Arial Black", 28, FontStyle.Bold) : F);
brush = (brush == null ? Brushes.Silver : brush);
float WaterStringLength = (float)WaterString.Length * F.Size;
switch (p){
case Position.Middle:
g.DrawString(WaterString, F, brush, (targetWidth - WaterStringLength) / 2, targetHeight / 2 - 50);
break;
case Position.TopCenter:
g.DrawString(WaterString, F, brush, (targetWidth - WaterStringLength) / 2, F.Size);
break;
case Position.BottomCenter:
g.DrawString(WaterString, F, brush, (targetWidth - WaterStringLength) / 2, targetHeight - F.Size * 2);
break;
case Position.TopLeft:
g.DrawString(WaterString, F, brush, 2, F.Size);
break;
case Position.BottomLeft:
g.DrawString(WaterString, F, brush, 2, targetHeight - F.Size * 2);
break;
default:
g.DrawString(WaterString, F, brush, (targetWidth - WaterStringLength) / 2, targetHeight / 2 - 50);
break;
}
}
g.Dispose();
//設(shè)置輸出格式
EncoderParameters encParams = new EncoderParameters(1);
encParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 65L);
ImageCodecInfo codeInfo = null;
ImageCodecInfo[] codeInfos = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo info in codeInfos)
{
if (info.MimeType.Equals("image/jpeg"))
{
codeInfo = info;
break;
}
}
if (codeInfo != null)
{
targetImage.Save(filename, codeInfo, encParams);
}
targetImage.Dispose();
sourceImage.Dispose();
}
/// <summary>
/// 壓縮圖片，默認(rèn)水印為居中
/// </summary>
/// <param name="sourceImage">原圖</param>
/// <param name="filename">壓縮圖片保存路徑</param>
/// <param name="r">壓縮大小</param>
/// <param name="WaterString">水印文字</param>
/// <param name="F">水印文字字體,如果為null則系統(tǒng)設(shè)置默認(rèn)值</param>
/// <param name="brush">筆刷如果為null則系統(tǒng)設(shè)置為默認(rèn)值</param>
public static void Compress(Image sourceImage, string filename, int r, string WaterString, Font F, Brush brush) {
Compress(sourceImage, filename, r, WaterString, F, brush, Position.Middle);
}
/// <summary>
/// 不壓縮圖片，不設(shè)置水印
/// </summary>
/// <param name="sourceImage">原圖</param>
/// <param name="filename">圖片保存路徑</param>
public static void Compress(Image sourceImage, string filename) {
Compress(sourceImage, filename, 0, null, null, null, Position.Middle);
}
/// <summary>
/// 壓縮圖片，不設(shè)置水印
/// </summary>
/// <param name="sourceImage">原圖</param>
/// <param name="filename">壓縮圖片保存路徑</param>
/// <param name="r">壓縮大小</param>
public static void Compress(Image sourceImage, string filename, int r){
Compress(sourceImage, filename, r, null, null, null, Position.Middle);
}
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="sourceImage">原圖</param>
/// <param name="thumbWidth">縮略圖寬度</param>
/// <param name="thumbHeight">縮略圖高度 </param>
/// <param name="filename">縮略圖的保存文件名 </param>
public static void CreateThumb(Image sourceImage, int thumbWidth, int thumbHeight, string filename) {
int tw = thumbWidth;
int th = thumbHeight;
if (sourceImage.Height < th && sourceImage.Width < tw)
{
th = sourceImage.Height;
tw = sourceImage.Width;
}
else if (sourceImage.Height / th > sourceImage.Width / tw)
{
tw = sourceImage.Width * th / sourceImage.Height;
}
else
{
th = sourceImage.Height * tw / sourceImage.Width;
}
//將圖片縮放到一個空白背景的圖片上，生成大小一致的縮略圖
Image thumbImage = Image.FromHbitmap(new Bitmap(thumbWidth, thumbHeight, PixelFormat.Format32bppRgb).GetHbitmap());
Graphics g = Graphics.FromImage(thumbImage);
//g.Clear(Color.Transparent);
//設(shè)置縮略圖的平滑度及質(zhì)量
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//繪制背景
SolidBrush brush = new SolidBrush(Color.White);
g.FillRectangle(brush, 0, 0, thumbWidth, thumbHeight);
//繪圖
g.DrawImage(sourceImage, (thumbWidth - tw) / 2, (thumbHeight - th) / 2, tw, th);
g.Dispose();
//保存縮略圖
thumbImage.Save(filename, ImageFormat.Png);
thumbImage.Dispose();
sourceImage.Dispose();
}
/// <summary>
/// 切割一個圖片
/// </summary>
/// <param name="sourceImage">原圖</param>
/// <param name="X">要切割的X軸位置</param>
/// <param name="Y">要切割的Y軸位置</param>
/// <param name="r">切割的矩形大小</param>
public static void Clip(Image sourceImage, int X, int Y,int Width,int Height,string filename) {
Bitmap b = new Bitmap(sourceImage);
Bitmap b1 = b.Clone(new Rectangle(X, Y, Width, Height), PixelFormat.Format24bppRgb);
b1.Save(filename);
b.Dispose();
b1.Dispose();
}
}
------------------
/// <summary>
/// 縮略圖處理類
/// </summary>
public class ThumbImage
{
public enum CutWay
{
/// <summary>
/// 指定高寬縮放（可能變形）
/// </summary>
HW,
/// <summary>
/// 指定寬，高按比例
/// </summary>
W,
/// <summary>
/// 指定高，寬按比例
/// </summary>
H,
/// <summary>
/// 指定高寬裁減（不變形）
/// </summary>
Cut,
/// <summary>
/// 等比縮放（不變形，如果高大按高，寬大按寬縮放）
/// </summary>
DB
}
/**/
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="originalImagePath">源圖路徑（物理路徑）</param>
/// <param name="thumbnailPath">縮略圖路徑（物理路徑）</param>
/// <param name="width">縮略圖寬度</param>
/// <param name="height">縮略圖高度</param>
/// <param name="cutWay">生成縮略圖的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, CutWay cutWay)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (cutWay)
{
case CutWay.HW://指定高寬縮放（可能變形）
break;
case CutWay.W://指定寬，高按比例
if ((double)originalImage.Width < (double)towidth && (double)originalImage.Height < (double)toheight)
{
towidth = originalImage.Width;
toheight = originalImage.Height;
}
else { toheight = originalImage.Height * width / originalImage.Width; }
break;
case CutWay.H://指定高，寬按比例
if ((double)originalImage.Width < (double)towidth && (double)originalImage.Height < (double)toheight)
{
towidth = originalImage.Width;
toheight = originalImage.Height;
}
else
{
towidth = originalImage.Width * height / originalImage.Height;
}
break;
case CutWay.Cut://指定高寬裁減（不變形）
if ((double)originalImage.Width < (double)towidth && (double)originalImage.Height < (double)toheight)
{
towidth = originalImage.Width;
toheight = originalImage.Height;
}
else if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
case CutWay.DB://等比縮放（不變形，如果高大按高，寬大按寬縮放）
if ((double)originalImage.Width<(double)towidth&&(double)originalImage.Height<(double)toheight)
{
towidth = originalImage.Width;
toheight = originalImage.Height;
}
else if ((double)originalImage.Width / (double)towidth < (double)originalImage.Height / (double)toheight)
{
toheight = height;
towidth = originalImage.Width * height / originalImage.Height;
}
else
{
towidth = width;
toheight = originalImage.Height * width / originalImage.Width;
}
break;
default:
break;
}
//新建一個bmp圖片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一個畫板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//設(shè)置高質(zhì)量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//設(shè)置高質(zhì)量,低速度呈現(xiàn)平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空畫布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);
//在指定位置并且按指定大小繪制原圖片的指定部分
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
new System.Drawing.Rectangle(x, y, ow, oh),
System.Drawing.GraphicsUnit.Pixel);
try
{
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/**/
/// <summary>
/// 在圖片上增加文字水印
/// </summary>
/// <param name="Path">原服務(wù)器圖片路徑</param>
/// <param name="Path_sy">生成的帶文字水印的圖片路徑</param>
public static void AddShuiYinWord(string Path, string Path_sy)
{
string addText = "測試水印";
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);
g.DrawString(addText, f, b, 15, 15);
g.Dispose();
image.Save(Path_sy);
image.Dispose();
}
/**/
/// <summary>
/// 在圖片上生成圖片水印
/// </summary>
/// <param name="Path">原服務(wù)器圖片路徑</param>
/// <param name="Path_syp">生成的帶圖片水印的圖片路徑</param>
/// <param name="Path_sypf">水印圖片路徑</param>
public static void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
g.Dispose();
image.Save(Path_syp);
image.Dispose();
}
/// <summary>
/// 獲得圖片信息
/// </summary>
/// <param name="Path">物理路徑</param>
/// <returns></returns>
public static ImageInformation GetImageInforation(string Path)
{
using (Image img = Image.FromFile(Path))
{
return new ImageInformation() { Width=img.Width, Height=img.Height };
}
}
}
/// <summary>
/// 獲得圖片信息
/// </summary>
public struct ImageInformation
{
/// <summary>
/// 圖片寬
/// </summary>
public int Width { get; set; }
/// <summary>
/// 圖片高
/// </summary>
public int Height { get; set; }
}

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