图片编辑类

using System;
using System.Drawing;
using System.IO;

/// <summary>
/// ImgEdit 的摘要说明
/// </summary>

public class ImgEdit
{
    
public ImgEdit()
    
{
        
//
        
// TODO: 在此处添加构造函数逻辑
        
//
    }


    
/// <summary>
    
/// 图片水印
    
/// </summary>
    
/// <param name="ImgFile">原图文件地址</param>
    
/// <param name="WaterImg">水印图片地址</param>
    
/// <param name="sImgPath">水印图片保存地址</param>
    
/// <param name="Alpha">水印透明度设置</param>
    
/// <param name="iScale">水印图片在原图上的显示比例(水平)</param>
    
/// <param name="intDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param>

    public bool ImgWater(string ImgFile, string WaterImg, string sImgPath, float Alpha, float iScale, int intDistance)
    
{
        
try
        
{
            
//装载图片
            FileStream fs = new FileStream(ImgFile, FileMode.Open);
            BinaryReader br 
= new BinaryReader(fs);
            
byte[] bytes = br.ReadBytes((int)fs.Length);
            br.Close();
            fs.Close();
            MemoryStream ms 
= new MemoryStream(bytes);

            System.Drawing.Image imgPhoto 
= System.Drawing.Image.FromStream(ms);
            
int imgPhotoWidth = imgPhoto.Width;
            
int imgPhotoHeight = imgPhoto.Height;

            System.Drawing.Image imgWatermark 
= new Bitmap(WaterImg);
            
int imgWatermarkWidth = imgWatermark.Width;
            
int imgWatermarkHeight = imgWatermark.Height;


            
//计算水印图片尺寸
            decimal aScale = Convert.ToDecimal(iScale);
            
decimal pScale = 0.05M;
            
decimal MinScale = aScale - pScale;
            
decimal MaxScale = aScale + pScale;

            
//设置比例
            int imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);
            
int imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight);


            
//将原图画出来
            Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            bmPhoto.SetResolution(
7272);
            Graphics gbmPhoto 
= Graphics.FromImage(bmPhoto);

            gbmPhoto.InterpolationMode 
= System.Drawing.Drawing2D.InterpolationMode.High;
            gbmPhoto.SmoothingMode 
= System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            gbmPhoto.Clear(Color.White);
            gbmPhoto.DrawImage(imgPhoto, 
new Rectangle(00, imgPhotoWidth, imgPhotoHeight), 00, imgPhotoWidth, imgPhotoHeight, GraphicsUnit.Pixel);

            Bitmap bmWatermark 
= new Bitmap(bmPhoto);
            bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

            Graphics gWatermark 
= Graphics.FromImage(bmWatermark);

            
//指定高质量显示水印图片质量
            gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            gWatermark.SmoothingMode 
= System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            System.Drawing.Imaging.ImageAttributes imageAttributes 
= new System.Drawing.Imaging.ImageAttributes();

            
//设置两种颜色,达到合成效果
            System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap();
            colorMap.OldColor 
= Color.FromArgb(25502550);
            colorMap.NewColor 
= Color.FromArgb(0000);

            System.Drawing.Imaging.ColorMap[] remapTable 
= { colorMap };

            imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);

            
//用矩阵设置水印图片透明度
            float[][] colorMatrixElements = 
               
new float[] {1.0f,  0.0f,  0.0f,  0.0f0.0f},
               
new float[] {0.0f,  1.0f,  0.0f,  0.0f0.0f},
               
new float[] {0.0f,  0.0f,  1.0f,  0.0f0.0f},
               
new float[] {0.0f,  0.0f,  0.0f,  Alpha, 0.0f},
               
new float[] {0.0f,  0.0f,  0.0f,  0.0f1.0f}
            }
;

            System.Drawing.Imaging.ColorMatrix wmColorMatrix 
= new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
            imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);

            
//确定水印边距
            int xPos = imgPhotoWidth - imgWatermarkWidthNew;
            
int yPos = imgPhotoHeight - imgWatermarkHeightNew;
            
int xPosOfWm = 0;
            
int yPosOfWm = 0;

            
if (xPos > intDistance)
                xPosOfWm 
= xPos - intDistance;
            
else
                xPosOfWm 
= xPos;

            
if (yPos > intDistance)
                yPosOfWm 
= yPos - intDistance;
            
else
                yPosOfWm 
= yPos;

            gWatermark.DrawImage(imgWatermark, 
new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew), 00, imgWatermarkWidth, imgWatermarkHeight, GraphicsUnit.Pixel, imageAttributes);

            imgPhoto 
= bmWatermark;


            imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);

            
//销毁对象
            gbmPhoto.Dispose();
            gWatermark.Dispose();

            imgPhoto.Dispose();
            imgWatermark.Dispose();

            
return true;
        }

        
catch (Exception ex)
        
{
            
return false;
        }

    }




    
/// <summary>
    
/// 文字水印
    
/// </summary>
    
/// <param name="ImgFile">原图文件地址</param>
    
/// <param name="TextFont">水印文字</param>
    
/// <param name="sImgPath">文字水印图片保存地址</param>
    
/// <param name="Alpha">文字透明度 其数值的范围在0到255</param>
    
/// <param name="widthFont">文字块在图片中所占宽度比例</param>
    
/// <param name="hScale">高度位置</param>

    public bool TextWater(string ImgFile, string TextFont, string sImgPath, int Alpha, float widthFont, float hScale)
    
{
        
try
        
{
            FileStream fs 
= new FileStream(ImgFile, FileMode.Open);
            BinaryReader br 
= new BinaryReader(fs);
            
byte[] bytes = br.ReadBytes((int)fs.Length);
            br.Close();
            fs.Close();
            MemoryStream ms 
= new MemoryStream(bytes);

            System.Drawing.Image imgPhoto 
= System.Drawing.Image.FromStream(ms);
            
int imgPhotoWidth = imgPhoto.Width;
            
int imgPhotoHeight = imgPhoto.Height;

            Bitmap bmPhoto 
= new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            bmPhoto.SetResolution(
7272);
            Graphics gbmPhoto 
= Graphics.FromImage(bmPhoto);
            gbmPhoto.Clear(Color.FromName(
"white"));//gif背景色
            gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            gbmPhoto.SmoothingMode 
= System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            gbmPhoto.DrawImage(imgPhoto, 
new Rectangle(00, imgPhotoWidth, imgPhotoHeight), 00, imgPhotoWidth, imgPhotoHeight, GraphicsUnit.Pixel);

            
//建立字体大小的数组,循环找出适合图片的水印字体
            int[] sizes = new int[] 100080070065060056054050045040038036034032030028026024022020018016014012010080726448322826242028161412108642 };
            System.Drawing.Font crFont 
= null;
            System.Drawing.SizeF crSize 
= new SizeF();
            
for (int i = 0; i < 43; i++)
            
{
                crFont 
= new Font("arial", sizes[i], FontStyle.Bold);
                crSize 
= gbmPhoto.MeasureString(TextFont, crFont);

                
if ((ushort)crSize.Width < (ushort)imgPhotoWidth * widthFont)
                    
break;
            }


            
//设置水印字体的位置
            int yPixlesFromBottom = (int)(imgPhotoHeight * hScale);
            
float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2));
            
float xCenterOfImg = (imgPhotoWidth * 1 / 2);

            System.Drawing.StringFormat StrFormat 
= new System.Drawing.StringFormat();
            StrFormat.Alignment 
= System.Drawing.StringAlignment.Center;

            
//画两次制造透明效果
            System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 000));
            gbmPhoto.DrawString(TextFont, crFont, semiTransBrush2, 
new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1), StrFormat);

            System.Drawing.SolidBrush semiTransBrush 
= new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 255255255));
            gbmPhoto.DrawString(TextFont, crFont, semiTransBrush, 
new System.Drawing.PointF(xCenterOfImg, yPosFromBottom), StrFormat);

            bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);

            gbmPhoto.Dispose();
            imgPhoto.Dispose();
            bmPhoto.Dispose();

            
return true;
        }

        
catch (Exception ex)
        
{
            
return false;
        }

    }



    
/// <summary>
    
/// 缩略图
    
/// </summary>
    
/// <param name="ImgFile">原图文件地址</param>
    
/// <param name="sImgPath">缩略图保存地址</param>
    
/// <param name="ResizeWidth">缩略图宽度</param>
    
/// <param name="ResizeHeight">缩略图高度</param>
    
/// <param name="BgColor">缩略图背景颜色,注意,背景颜色只能指定KnownColor中的值,如white,blue,red,green等</param>

    public bool ResizeImg(string ImgFile, string sImgPath, int ResizeWidth, int ResizeHeight, string BgColor)
    
{
        
try
        
{
            FileStream fs 
= new FileStream(ImgFile, FileMode.Open);
            BinaryReader br 
= new BinaryReader(fs);
            
byte[] bytes = br.ReadBytes((int)fs.Length);
            br.Close();
            fs.Close();
            MemoryStream ms 
= new MemoryStream(bytes);

            System.Drawing.Image imgPhoto 
= System.Drawing.Image.FromStream(ms);
            
int imgPhotoWidth = imgPhoto.Width;
            
int imgPhotoHeight = imgPhoto.Height;
            
int StartX = 0;
            
int StartY = 0;
            
int NewWidth = imgPhotoWidth;
            
int NewHeight = imgPhotoHeight;

            
//计算缩放图片尺寸
            if (NewWidth > ResizeWidth)
            
{
                NewWidth 
= ResizeWidth;
                NewHeight 
= Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(NewWidth) / Convert.ToDecimal(imgPhotoWidth), 10));
            }


            
if (NewHeight > ResizeHeight)
            
{
                NewHeight 
= ResizeHeight;
                NewWidth 
= Convert.ToInt32(imgPhotoWidth * Math.Round(Convert.ToDecimal(NewHeight) / Convert.ToDecimal(imgPhotoHeight), 10));
            }


            StartX 
= ResizeWidth - NewWidth;
            StartY 
= ResizeHeight - NewHeight;

            StartX 
= StartX > 0 ? StartX / 2 : 0;
            StartY 
= StartY > 0 ? StartY / 2 : 0;

            Bitmap bmPhoto 
= new Bitmap(ResizeWidth, ResizeHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            bmPhoto.SetResolution(
7272);
            Graphics gbmPhoto 
= Graphics.FromImage(bmPhoto);
            gbmPhoto.Clear(Color.FromName(BgColor));
            gbmPhoto.InterpolationMode 
= System.Drawing.Drawing2D.InterpolationMode.High;
            gbmPhoto.SmoothingMode 
= System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            gbmPhoto.DrawImage(imgPhoto, 
new Rectangle(StartX, StartY, NewWidth, NewHeight), new Rectangle(00, imgPhotoWidth, imgPhotoHeight), GraphicsUnit.Pixel);
            bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);

            imgPhoto.Dispose();
            gbmPhoto.Dispose();
            bmPhoto.Dispose();

            
return true;
        }

        
catch (Exception err)
        
{
            
return false;
        }

    }



    
/// <summary>
    
/// 图片剪切
    
/// </summary>
    
/// <param name="ImgFile">原图文件地址</param>
    
/// <param name="sImgPath">缩略图保存地址</param>
    
/// <param name="PointX">剪切起始点 X坐标</param>
    
/// <param name="PointY">剪切起始点 Y坐标</param>
    
/// <param name="CutWidth">剪切宽度</param>
    
/// <param name="CutHeight">剪切高度</param>

    public bool CutImg(string ImgFile, string sImgPath, int PointX, int PointY, int CutWidth, int CutHeight)
    
{
        
try
        
{
            FileStream fs 
= new FileStream(ImgFile, FileMode.Open);
            BinaryReader br 
= new BinaryReader(fs);
            
byte[] bytes = br.ReadBytes((int)fs.Length);
            br.Close();
            fs.Close();
            MemoryStream ms 
= new MemoryStream(bytes);
            System.Drawing.Image imgPhoto 
= System.Drawing.Image.FromStream(ms);

            
//System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);
            
//此处只能用filestream,用 System.Drawing.Image则会报多过进程访问文件的错误,会锁定文件
            Bitmap bmPhoto = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            bmPhoto.SetResolution(
7272);
            Graphics gbmPhoto 
= Graphics.FromImage(bmPhoto);
            gbmPhoto.InterpolationMode 
= System.Drawing.Drawing2D.InterpolationMode.High;
            gbmPhoto.SmoothingMode 
= System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            gbmPhoto.DrawImage(imgPhoto, 
new Rectangle(00, CutWidth, CutHeight), new Rectangle(PointX, PointY, CutHeight, CutHeight), GraphicsUnit.Pixel);
            bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);

            imgPhoto.Dispose();
            gbmPhoto.Dispose();
            bmPhoto.Dispose();

            
return true;
        }

        
catch (Exception err)
        
{
            
return false;
        }

    }

}
posted @ 2008-03-27 21:52  cloudgamer  阅读(...)  评论(... 编辑 收藏