Question

我是C＃的新手（刚开始今天）

我需要能够使用canvas处理程序制作C＃Image resizer。例如，500 x 500图像需要保持其纵横比。它将被调整为1024x500。要做到这一点，它将保持500x500，但然后用空白（画布）填充剩余的空间。

我还将相同的原始图像调整为300 x 500，其中图像将再次保持其1：1比例，并调整为300x300，剩余空间再次用作画布空白区域。

有人可以帮助我为此制作一个C＃控制台应用程序，我能理解吗？

这是我设法找到的，我可以合理地理解（由于好的评论）。

我用代码发现的是我可以阅读它，但是当我谈到实际写一些时，我就崩溃了。我主要做HTML和CSS。开始分支到JQuery和C＃

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Drawing.Imaging;

namespace ImageResizer
{

    class ImageResize
    {
        static void Main(string[] args)
        {
        }
        public void ResizeImage(string OriginalFile, string NewFile, int NewWidth, int MaxHeight, bool OnlyResizeIfWider)
        {
            System.Drawing.Image FullsizeImage = System.Drawing.Image.FromFile(OriginalFile);

            // Prevent using images internal thumbnail

            FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);

            FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);

            if (OnlyResizeIfWider)
                {

                    if (FullsizeImage.Width <= NewWidth)
                {
                NewWidth = FullsizeImage.Width;
                }
                }

            int NewHeight = FullsizeImage.Height * NewWidth / FullsizeImage.Width;
            if (NewHeight > MaxHeight)
            {
            // Resize with height instead
                NewWidth = FullsizeImage.Width * MaxHeight / FullsizeImage.Height;
                NewHeight = MaxHeight;
            }
            System.Drawing.Image NewImage = FullsizeImage.GetThumbnailImage(NewWidth, NewHeight, null, IntPtr.Zero);

            // Clear handle to original file so that we can overwrite it if necessary
            FullsizeImage.Dispose();

            // Save resized picture
        NewImage.Save(NewFile);
        }
    }
}

Answer 1

尝试使用此＆gt;＆gt;

private void resizeImage(string path, string originalFilename, 
                     /* note changed names */
                     int canvasWidth, int canvasHeight, 
                     /* new */
                     int originalWidth, int originalHeight)
{
    Image image = Image.FromFile(path + originalFilename);

    System.Drawing.Image thumbnail = 
        new Bitmap(canvasWidth, canvasHeight); // changed parm names
    System.Drawing.Graphics graphic = 
                 System.Drawing.Graphics.FromImage(thumbnail);

    graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
    graphic.SmoothingMode = SmoothingMode.HighQuality;
    graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
    graphic.CompositingQuality = CompositingQuality.HighQuality;

    /* ------------------ new code --------------- */

    // Figure out the ratio
    double ratioX = (double) canvasWidth / (double) originalWidth;
    double ratioY = (double) canvasHeight / (double) originalHeight;
    // use whichever multiplier is smaller
    double ratio = ratioX < ratioY ? ratioX : ratioY;

    // now we can get the new height and width
    int newHeight = Convert.ToInt32(originalHeight * ratio);
    int newWidth = Convert.ToInt32(originalWidth * ratio);

    // Now calculate the X,Y position of the upper-left corner 
    // (one of these will always be zero)
    int posX = Convert.ToInt32((canvasWidth - (originalWidth * ratio)) / 2);
    int posY = Convert.ToInt32((canvasHeight - (originalHeight * ratio)) / 2);

    graphic.Clear(Color.White); // white padding
    graphic.DrawImage(image, posX, posY, newWidth, newHeight);

    /* ------------- end new code ---------------- */

    System.Drawing.Imaging.ImageCodecInfo[] info =
                     ImageCodecInfo.GetImageEncoders();
    EncoderParameters encoderParameters;
    encoderParameters = new EncoderParameters(1);
    encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality,
                     100L);            
    thumbnail.Save(path + width + "." + originalFilename, info[1], 
                     encoderParameters);
}

带有Canvas Handler的C＃Image Resizer

1 个答案: