|
|
@@ -0,0 +1,140 @@
|
|
|
+using System;
|
|
|
+using System.Drawing;
|
|
|
+
|
|
|
+namespace Y.Utils.Net20.ImageUtils
|
|
|
+{
|
|
|
+ public class ImageTool
|
|
|
+ {
|
|
|
+ /// <summary>
|
|
|
+ /// 生成缩略图
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="originalImagePath">源图路径(物理路径)</param>
|
|
|
+ /// <param name="thumbnailPath">缩略图路径(物理路径)</param>
|
|
|
+ /// <param name="width">缩略图宽度</param>
|
|
|
+ /// <param name="height">缩略图高度</param>
|
|
|
+ /// <param name="mode">生成缩略图的方式</param>
|
|
|
+ public static bool MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
|
|
|
+ {
|
|
|
+ Image originalImage = Image.FromFile(originalImagePath);
|
|
|
+ int towidth = width;
|
|
|
+ int toheight = height;
|
|
|
+ int x = 0;
|
|
|
+ int y = 0;
|
|
|
+ int ow = originalImage.Width;
|
|
|
+ int oh = originalImage.Height;
|
|
|
+ switch (mode)
|
|
|
+ {
|
|
|
+ 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
|
|
|
+ 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.Jpeg);
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ catch (System.Exception e)
|
|
|
+ {
|
|
|
+ return false;
|
|
|
+ //throw e;
|
|
|
+ }
|
|
|
+ finally
|
|
|
+ {
|
|
|
+ originalImage.Dispose();
|
|
|
+ bitmap.Dispose();
|
|
|
+ g.Dispose();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ /// <summary>
|
|
|
+ /// 逆时针旋转图像
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="originalImagePath">原始图像路径</param>
|
|
|
+ /// <param name="saveImagePath">保存图像的路径</param>
|
|
|
+ /// <param name = "angle" > 旋转角度[0, 360](前台给的) </ param >
|
|
|
+ /// <returns></returns>
|
|
|
+ public static bool RotateImg(string originalImagePath, string saveImagePath, int angle)
|
|
|
+ {
|
|
|
+ Image originalImage = Image.FromFile(originalImagePath);
|
|
|
+ angle = angle % 360;
|
|
|
+ //弧度转换
|
|
|
+ double radian = angle * Math.PI / 180.0;
|
|
|
+ double cos = Math.Cos(radian);
|
|
|
+ double sin = Math.Sin(radian);
|
|
|
+ //原图的宽和高
|
|
|
+ int w = originalImage.Width;
|
|
|
+ int h = originalImage.Height;
|
|
|
+ int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));
|
|
|
+ int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));
|
|
|
+ //目标位图
|
|
|
+ Bitmap saveImage = new Bitmap(W, H);
|
|
|
+ Graphics g = Graphics.FromImage(saveImage);
|
|
|
+ g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
|
|
|
+ g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
|
|
|
+ //计算偏移量
|
|
|
+ Point Offset = new Point((W - w) / 2, (H - h) / 2);
|
|
|
+ //构造图像显示区域:让图像的中心与窗口的中心点一致
|
|
|
+ Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);
|
|
|
+ Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
|
|
|
+ g.TranslateTransform(center.X, center.Y);
|
|
|
+ g.RotateTransform(360 - angle);
|
|
|
+ //恢复图像在水平和垂直方向的平移
|
|
|
+ g.TranslateTransform(-center.X, -center.Y);
|
|
|
+ g.DrawImage(originalImage, rect);
|
|
|
+ //重至绘图的所有变换
|
|
|
+ g.ResetTransform();
|
|
|
+ g.Save();
|
|
|
+ //保存旋转后的图片
|
|
|
+ originalImage.Dispose();
|
|
|
+ try
|
|
|
+ {
|
|
|
+ saveImage.Save(saveImagePath, System.Drawing.Imaging.ImageFormat.Jpeg);
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ catch (Exception e) { return false; }
|
|
|
+ finally
|
|
|
+ {
|
|
|
+ originalImage.Dispose();
|
|
|
+ saveImage.Dispose();
|
|
|
+ g.Dispose();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|