C＃：如何按比例调整图像的最大高度 [英] C# : How to resize image proportionately with max height

问题描述

我需要按比例调整图片的大小，而不改变方面ratio.I有code固定HIGHT和宽度来调整，但我需要与最大高度按比例调整图像（600说像素）。我怎样才能修改code，以满足我的要求？

I need to resize my image proportionately without changing aspect ratio.I have the code to resize with fixed hight and width but I need to resize image proportionately with max height(say 600 pixels). How can I modify the code to suit my requirement?

public static void Main()
{
  var image = Image.FromFile(@"c:\logo.png");
  var newImage = ScaleImage(image, 300, 400);
  newImage.Save(@"c:\test.png", ImageFormat.Png);
}

public static Image ScaleImage(Image image, int maxWidth, int maxHeight)
 {
  var ratioX = (double)maxWidth / image.Width;
  var ratioY = (double)maxHeight / image.Height;
  var ratio = Math.Min(ratioX, ratioY);

  var newWidth = (int)(image.Width * ratio);
  var newHeight = (int)(image.Height * ratio);

  var newImage = new Bitmap(newWidth, newHeight);
  Graphics.FromImage(newImage).DrawImage(image, 0, 0, newWidth, newHeight);
  return newImage;
}

请提供您宝贵的想法。

推荐答案

这几乎感觉易，我觉得我失去了一些东西。反正不就是这样的伎俩？

This almost feels to easy and I feel I'm missing something. Anyway, won't that do the trick?

public static Image ScaleImage(Image image, int maxHeight) 
{ 
    var ratio = (double)maxHeight / image.Height; 

    var newWidth = (int)(image.Width * ratio); 
    var newHeight = (int)(image.Height * ratio); 

    var newImage = new Bitmap(newWidth, newHeight); 
    using (var g = Graphics.FromImage(newImage))
    {
        g.DrawImage(image, 0, 0, newWidth, newHeight); 
    }
    return newImage; 
} 

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