我需要按比例调整图片大小而不改变其纵横比。我已经有了用固定高度和宽度调整大小的代码,但我需要根据最大高度(比如600像素)等比缩放图像。我该如何修改代码以满足我的需求?
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;
}
请提供你宝贵的想法。