让图片不变形

#region 让图片不变形 /// <summary> /// 小图标等比例缩小 /// </summary> /// <param name="_files"></param> /// <returns></returns> private ImageList GetImageFrom2(string[] _files) { ImageList list = new ImageList();

int picWidth; int picHeight; int _iconW = 60; int _iconH = 80; int _picTop; int _picLeft; Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback); Bitmap myBitmap = null; Image _tempImage; for (int i = 0; i < _files.Length; i++) {

myBitmap = new Bitmap(_files[i]); CalateSize(myBitmap.Width, myBitmap.Height, _iconW, _iconH, out picWidth, out picHeight); Image myThumbnail = myBitmap.GetThumbnailImage(picWidth, picHeight, myCallback, IntPtr.Zero);

//第一步 Bitmap bp = new Bitmap(_iconW, _iconH); //第二步 Graphics g = Graphics.FromImage(bp); g.Clear(Color.White); g.DrawImage(myThumbnail, (_iconW - picWidth) / 2, (_iconH - picHeight) / 2); list.Images.Add(_files[i], (Image)bp); list.ImageSize = new Size(_iconW, _iconH); } return list; } public bool ThumbnailCallback() { return false; } /// <summary> /// 获取小图标不变形的大小 /// </summary> /// <param name="picW"></param> /// <param name="picH"></param> /// <param name="iconW"></param> /// <param name="incoH"></param> /// <param name="_w"></param> /// <param name="_h"></param> public void CalateSize(int picW, int picH, int iconW, int incoH, out int _w, out int _h) { int _a = picW; // 2488 int _b = picH; // 4288 int _c = iconW; //60 int _d = incoH; //80 if ((_a / _b) > (_c / _d)) { _w = iconW; //40 _h = (_b * iconW / _a); } else { _h = incoH; _w = (_a * incoH / _b); } }

#endregion 让图片不变形