Question

我正在尝试制作一个简单的图片缩略图应用程序。我搜索过网络，发现了相当复杂的缩略图应用程序，简单的应用程序。我有一个好的工作，如果我能让ImageButton Resolution看起来很好。目前，一切正常，但按钮的重新设置是可怕的（我尝试了各种宽度/高度变化）。

我只是遍历一个按钮Image的数组并设置它们的属性。我调用ThumbnailSize（）来设置Imagebutton的宽度/高度。

现在的代码有点草率，但除此之外。我想知道是否有办法在拍照（800x600 +/-）并将其缩小为图像按钮时保持或增加ImageButton分辨率。

string[] files = null;
files = Directory.GetFiles(Server.MapPath("Pictures"), "*.jpg");

    ImageButton[] arrIbs = new ImageButton[files.Length];

    for (int i = 0; i < files.Length; i++)
    {

        arrIbs[i] = new ImageButton();
        arrIbs[i].ID = "imgbtn" + Convert.ToString(i);
        arrIbs[i].ImageUrl = "~/Gallery/Pictures/pic" + i.ToString() + ".jpg";

        ThumbNailSize(ref arrIbs[i]);
        //arrIbs[i].BorderStyle = BorderStyle.Inset;

        arrIbs[i].AlternateText = System.IO.Path.GetFileName(Convert.ToString(files[i]));
        arrIbs[i].PostBackUrl = "default.aspx?img=" + "pic" + i.ToString();

        pnlThumbs.Controls.Add(arrIbs[i]);

    }


}
public ImageButton ThumbNailSize(ref ImageButton imgBtn)
{
    //Create Image with ImageButton path, and determine image size
    System.Drawing.Image img =
        System.Drawing.Image.FromFile(Server.MapPath(imgBtn.ImageUrl));

    if (img.Height > img.Width)
    {
        //Direction is Verticle
        imgBtn.Height = 140;
        imgBtn.Width = 90;

        return imgBtn;

    }
    else
    {
        //Direction is Horizontal
        imgBtn.Height = 110;
        imgBtn.Width = 130;
        return imgBtn;
    }


}

Answer 1

此功能将按比例调整Size结构的大小。只需提供最大高度/宽度，它将返回适合该矩形的大小。

/// <summary>
/// Proportionally resizes a Size structure.
/// </summary>
/// <param name="sz"></param>
/// <param name="maxWidth"></param>
/// <param name="maxHeight"></param>
/// <returns></returns>
public static Size Resize(Size sz, int maxWidth, int maxHeight)
{
    int height = sz.Height;
    int width = sz.Width;

    double actualRatio = (double)width / (double)height;
    double maxRatio = (double)maxWidth / (double)maxHeight;
    double resizeRatio;

    if (actualRatio > maxRatio)
        // width is the determinate side.
        resizeRatio = (double)maxWidth / (double)width;
    else
        // height is the determinate side.
        resizeRatio = (double)maxHeight / (double)height;

    width = (int)(width * resizeRatio);
    height = (int)(height * resizeRatio);

    return new Size(width, height);
}

Answer 2

您需要根据原始尺寸缩放图像。仅设置大小肯定会导致缩放问题。

看一下这个链接

C#: Resize An Image While Maintaining Aspect Ratio and Maximum Height

C＃ImageButton图片分辨率

2 个答案: