图片裁剪[精品]
图片裁剪
///
/// 生成缩略图
///
///
源图路径(物理路
径)
///
缩略图路径(物理路径)
///
缩略图宽度
///
缩略图高度
///
生成缩略图的方式
///
返回缩略图的
public void MakeThumbnail(string originalImagePath,
string thumbnailPath, int width, int height, out string
outthumbnailPath)
{
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;
// {
// case "HW"://指定高宽缩放(可能变形)
// break;
// case "W"://指定宽，高按比例
// toheight = originalImage.Height * width / originalImage.Width;
// break;
// case "H"://指定高，宽按比例
// towidth = originalImage.Width * height / originalImage.Height;
// break;
// case "Cut"://指定高宽裁减(不变形)
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;
// default:
// break;
// }
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//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;
//清空画布并以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new Rectangle(0, 0,
towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath,
System.Drawing.Imaging.ImageFormat.Png);
outthumbnailPath = thumbnailPath;
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
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