/// <summary>
/// 按原图产生指定的截图
/// </summary>
/// <param name="oderimgurl">原图路径</param>
/// <param name="width">指定宽</param>
/// <param name="height"></param>
/// <param name="mode"></param>
/// <param name="newimgurl">新图路径</param>
/// <returns>截图后的文件名</returns>
public bool getnewimage(string oderimgurl, int width, int height, MakeImageMode mode, string newimgurl, string Extension)
{
bool status = true;
System.Drawing.Image img;//定义一个图片对象
System.Drawing.Image newimg;
System.Drawing.Image temp;
Image bitmapnew;
MemoryStream ms = new MemoryStream();
img = System.Drawing.Image.FromFile(oderimgurl); //写入对象
newimg = ImageLibrary.MakeImage(img, width, height, mode); //切图产生了一个新的图片对象
_resimg.imgwidth = newimg.Width; //图片宽
_resimg.imghidth = newimg.Height; //图片高
temp = img; //引用旧图
temp.Dispose(); //释放旧图
img = newimg; //把新图放到img
img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
bitmapnew = ((Image) new Bitmap(ms)); //文件流转换为图片对象
img.Dispose(); //释放
byte[] bytes = ms.ToArray();
int imgsize = int.Parse(ms.Length.ToString());
string newimgname = ImageLibrary.md5(bytes);//文件流加密md5
string newimgfileurl = newimgurl + newimgname + Extension;
try
{
bitmapnew.Save(newimgfileurl, System.Drawing.Imaging.ImageFormat.Jpeg);
status = true;
}
catch (System.Exception e)
{
status = false;
throw e;
}
finally
{
temp.Dispose();
img.Dispose();
ms.Close();
ms.Dispose();
bitmapnew.Dispose();
}
_resimg.imgmd5 = newimgname;
_resimg.imgname = newimgname + Extension;
_resimg.imgsize = imgsize / 1024;
return(status);
}
/// <summary>
/// 通用的缩图方法~~
/// </summary>
/// <param name="image">原图</param>
/// <param name="width">新宽</param>
/// <param name="height">新高</param>
/// <param name="mode">模式</param>
public static Image MakeImage(Image image, int width, int height, MakeImageMode mode)
{
if (width <= 0)
{
width = height;
}
if (height <= 0)
{
height = width;
}
if (width <= 0 && height <= 0)
{
width = 100;
height = 100;
}
Rectangle dect = new Rectangle(0, 0, width, height);
Rectangle src = new Rectangle(0, 0, image.Width, image.Height);
switch (mode)
{
case MakeImageMode.AbsoluteWidthHeight: //定宽和高 可能变形
break;
case MakeImageMode.AbsoluteWidth: //指定宽，高按比例
dect.Height = height = image.Height * width / image.Width;
break;
case MakeImageMode.AbsoluteHeight: //指定高，宽按比例
dect.Width = width = image.Width * height / image.Height;
break;
case MakeImageMode.CutWidthHeight: //指定高宽裁减（不变形）
if ((double)image.Width / (double)image.Height > (double)dect.Width / (double)dect.Height)
{
src.Width = image.Height * dect.Width / dect.Height;
src.X = (image.Width - src.Width) / 2;
}
else
{
src.Height = image.Width * height / dect.Width;
src.Y = (image.Height - src.Height) / 2;
}
break;
case MakeImageMode.ZoomWidthHeight: //缩成~宽~高~~内~
break;
case MakeImageMode.ZoomSquare: //正方可以上上面的方法剪~~这里缩~不剪
if (image.Height > image.Width)
{
dect.Width = image.Width * height / image.Height;
dect.X = (width - dect.Width) / 2;
}
else
{
dect.Height = image.Height * width / image.Width;
dect.Y = (height - dect.Height) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
Image bitmap = new System.Drawing.Bitmap(width, height);
//新建一个画板
Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以 白色背景 填充
g.Clear(Color.White);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(image, dect, src, GraphicsUnit.Pixel);
return(bitmap);
}
