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c# - 在 C# 中使用宽高比调整图像大小并裁剪中心图像,因此没有间隙

转载 作者:IT王子 更新时间:2023-10-29 04:29:26 25 4
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我正在尝试将用户上传的图片调整为横向尺寸,例如450w 和 250h,同时保持宽高比,但为了避免调整大小的图像(如纵向图像)在侧面有间隙,我想裁剪图像的中心以填充调整大小的尺寸。

我找到了很多代码来调整图像大小,同时保持纵横比,但不是我在上面寻找的代码,我希望有人能提供帮助。

最佳答案

你应该传递 needToFill = true:

public static System.Drawing.Image FixedSize(Image image, int Width, int Height, bool needToFill)
{
#region calculations
int sourceWidth = image.Width;
int sourceHeight = image.Height;
int sourceX = 0;
int sourceY = 0;
double destX = 0;
double destY = 0;

double nScale = 0;
double nScaleW = 0;
double nScaleH = 0;

nScaleW = ((double)Width / (double)sourceWidth);
nScaleH = ((double)Height / (double)sourceHeight);
if (!needToFill)
{
nScale = Math.Min(nScaleH, nScaleW);
}
else
{
nScale = Math.Max(nScaleH, nScaleW);
destY = (Height - sourceHeight * nScale) / 2;
destX = (Width - sourceWidth * nScale) / 2;
}

if (nScale > 1)
nScale = 1;

int destWidth = (int)Math.Round(sourceWidth * nScale);
int destHeight = (int)Math.Round(sourceHeight * nScale);
#endregion

System.Drawing.Bitmap bmPhoto = null;
try
{
bmPhoto = new System.Drawing.Bitmap(destWidth + (int)Math.Round(2 * destX), destHeight + (int)Math.Round(2 * destY));
}
catch (Exception ex)
{
throw new ApplicationException(string.Format("destWidth:{0}, destX:{1}, destHeight:{2}, desxtY:{3}, Width:{4}, Height:{5}",
destWidth, destX, destHeight, destY, Width, Height), ex);
}
using (System.Drawing.Graphics grPhoto = System.Drawing.Graphics.FromImage(bmPhoto))
{
grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
grPhoto.CompositingQuality = CompositingQuality.HighQuality;
grPhoto.SmoothingMode = SmoothingMode.HighQuality;

Rectangle to = new System.Drawing.Rectangle((int)Math.Round(destX), (int)Math.Round(destY), destWidth, destHeight);
Rectangle from = new System.Drawing.Rectangle(sourceX, sourceY, sourceWidth, sourceHeight);
//Console.WriteLine("From: " + from.ToString());
//Console.WriteLine("To: " + to.ToString());
grPhoto.DrawImage(image, to, from, System.Drawing.GraphicsUnit.Pixel);

return bmPhoto;
}
}

关于c# - 在 C# 中使用宽高比调整图像大小并裁剪中心图像,因此没有间隙,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10323633/

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