使用 MaxHeight 和 MaxWidth 约束按比例调整图像大小 [英] Resize image proportionally with MaxHeight and MaxWidth constraints

问题描述

使用System.Drawing.Image.

如果图像宽度或高度超过最大值，则需要按比例调整大小.调整大小后需要确保宽度和高度都不超过限制.

If an image width or height exceed the maximum, it need to be resized proportionally . After resized it need to make sure that neither width or height still exceed the limit.

宽度和高度将自动调整直到不超过最大值和最小值(可能的最大尺寸)并保持比例.

The Width and Height will be resized until it is not exceed to maximum and minimum automatically (biggest size possible) and also maintain the ratio.

推荐答案

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public static void Test()
{
    using (var image = Image.FromFile(@"c:logo.png"))
    using (var newImage = ScaleImage(image, 300, 400))
    {
        newImage.Save(@"c:	est.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);

    using (var graphics = Graphics.FromImage(newImage))
        graphics.DrawImage(image, 0, 0, newWidth, newHeight);

    return newImage;
}

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