/// <summary>
/// 等比例缩放，不留白
/// </summary>
/// <param name="strOldPic"></param>
/// <param name="strNewPic"></param>
/// <param name="inputWidth"></param>
/// <param name="inputHeight"></param>
/// <returns></returns>
public static bool ZoomSmallPic2(string strOldPic, string strNewPic, int inputWidth, int inputHeight)
{
Bitmap objPic, objNewPic, outBitMap;
try
{
objPic = new Bitmap(strOldPic);
int imageWidth = objPic.Width;
int imageHeight = objPic.Height;
if (imageWidth > inputWidth)
{
imageHeight = ParseHelper.ToInt((double)inputWidth / (double)imageWidth * imageHeight);
imageWidth = inputWidth;
}
if (imageHeight > inputHeight)
{
imageWidth = ParseHelper.ToInt((double)inputHeight / (double)imageHeight * imageWidth);
imageHeight = inputHeight;
}
//缩放好的图片
objNewPic = new Bitmap(objPic, imageWidth, imageHeight);
//检测目录是否存在
var saveDir = Path.GetDirectoryName(strNewPic);
if (saveDir != null && !Directory.Exists(saveDir))
{
Directory.CreateDirectory(saveDir);
}
string mergeImageExt = Path.GetExtension(strNewPic);
if (mergeImageExt != null && mergeImageExt.Contains("png"))
{
objNewPic.Save(strNewPic, ImageFormat.Png);
}
else if (mergeImageExt != null && mergeImageExt.Contains("gif"))
{
objNewPic.Save(strNewPic, ImageFormat.Gif);
}
else
{
objNewPic.Save(strNewPic, ImageFormat.Jpeg);
}
objPic.Dispose();
objNewPic.Dispose();
}
catch (Exception exp)
{
throw exp;
}
finally
{
objPic = null;
objNewPic = null;
outBitMap = null;
}
return(true);
}
/// <summary>
/// 给图片添加文字水印
/// </summary>
/// <param name="filePath">图片完整服务器路径</param>
/// <param name="text">水印文字</param>
/// <param name="rate"></param>
public static void AddText(string filePath, string text, double rate = 1.0)
{
if (string.IsNullOrEmpty(text))
{
return;
}
Image image = Image.FromFile(filePath);
Graphics g = Graphics.FromImage(image);
//将图片绘制到graphics中
g.DrawImage(image, 0, 0, image.Width, image.Height);
//文字的起始位置，x,y坐标,计算坐标
int fontHeight = ParseHelper.ToInt(50 * rate);
var family = new FontFamily("微软雅黑");
const int fontStyle = (int)FontStyle.Regular;
int emSize = ParseHelper.ToInt(40 * rate);
int x = image.Width / 2 - text.Length * emSize / 2;
int y = image.Height / 2 - fontHeight / 2;
if (x < 0)
{
x = 0;
}
var origin = new Point(x, y);
StringFormat format = StringFormat.GenericDefault;
//设置字体的颜色
//Brush bFont = new SolidBrush(Color.FromArgb(214, 203, 199));
Brush bFont = new SolidBrush(Color.WhiteSmoke);
//描边
var myPath = new GraphicsPath();
myPath.AddString(text, family, fontStyle, emSize, origin, format);
g.FillPath(bFont, myPath);
//写字（0表示没有，2是以前的参数）
//g.DrawPath(new Pen(Color.Black, 2), myPath);
g.DrawPath(new Pen(Color.WhiteSmoke, 0), myPath);
//释放graphics
g.Dispose();
//确定新图片的文件路径
var oldfileName = Path.GetFileNameWithoutExtension(filePath);
var tempPath = filePath;
if (oldfileName != null)
{
string newpath = filePath.Replace(oldfileName, "img_X");
//保存写上字的图片
image.Save(newpath);
//释放image
image.Dispose();
//删除没加水印的图片，记得一定要放在image释放之后，否则无法删除
File.Delete(filePath);
//重命名
File.Move(newpath, tempPath);
}
}
/// <summary>
/// 按比例缩小图片，自动计算宽度
/// </summary>
/// <param name="strOldPic">源图文件名(包括路径)</param>
/// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>
/// <param name="inputWidth">缩小到宽度</param>
/// <param name="inputHeight">缩小至高度</param>
public static bool ZoomSmallPic(string strOldPic, string strNewPic, int inputWidth, int inputHeight)
{
Bitmap objPic, objNewPic, outBitMap;
try
{
objPic = new Bitmap(strOldPic);
int imageWidth = objPic.Width;
int imageHeight = objPic.Height;
if (imageWidth > inputWidth)
{
imageHeight = ParseHelper.ToInt((double)inputWidth / (double)imageWidth * imageHeight);
imageWidth = inputWidth;
}
if (imageHeight > inputHeight)
{
imageWidth = ParseHelper.ToInt((double)inputHeight / (double)imageHeight * imageWidth);
imageHeight = inputHeight;
}
//缩放好的图片
objNewPic = new Bitmap(objPic, imageWidth, imageHeight);
if (inputWidth == int.MaxValue || inputHeight == int.MaxValue)
{
inputWidth = objPic.Width;
inputHeight = objPic.Height;
}
//放到图片的中心位置
outBitMap = new Bitmap(inputWidth, inputHeight);//输出的图片
Graphics grap = Graphics.FromImage(outBitMap);
grap.Clear(Color.White);
grap.CompositingQuality = CompositingQuality.HighSpeed;
int newPositonX = (inputWidth - imageWidth) / 2;
int newPositonY = (inputHeight - imageHeight) / 2;
grap.DrawImage(objNewPic, newPositonX, newPositonY);
//检测目录是否存在
var saveDir = Path.GetDirectoryName(strNewPic);
if (saveDir != null && !Directory.Exists(saveDir))
{
Directory.CreateDirectory(saveDir);
}
string mergeImageExt = Path.GetExtension(strNewPic);
if (mergeImageExt != null && mergeImageExt.Contains("png"))
{
outBitMap.Save(strNewPic, ImageFormat.Png);
}
else if (mergeImageExt != null && mergeImageExt.Contains("gif"))
{
outBitMap.Save(strNewPic, ImageFormat.Gif);
}
else
{
outBitMap.Save(strNewPic, ImageFormat.Jpeg);
}
grap.Dispose();
objPic.Dispose();
objNewPic.Dispose();
outBitMap.Dispose();
}
catch (Exception exp)
{
throw exp;
}
finally
{
objPic = null;
objNewPic = null;
outBitMap = null;
}
return(true);
}