C# 将多个Image 合成为一个,格式可选择

最新推荐文章于 2021-12-04 09:03:15 发布

最新推荐文章于 2021-12-04 09:03:15 发布 · 646 阅读

本文介绍了一种通过编程方式将多张图片按横向或纵向合并成一张图片的技术方案。该方案利用C#语言实现，能够自动调整合并后图片的尺寸，确保最终图片的质量。文中提供了详细的代码实现，并附带了单元测试案例。

在一些场景中，需要把多个图片，合（拼）成为一张，合成效果示例：

纵向：

横向：

代码实现：

 enum ImageMergeOrientation
    {
        Horizontal,
        Vertical
    }

private void CombineImages(FileInfo[] files, string toPath, ImageMergeOrientation mergeType = ImageMergeOrientation.Vertical)
        {
            //change the location to store the final image.
            var finalImage = toPath;
            var imgs = files.Select(f => Image.FromFile(f.FullName));

            var finalWidth = mergeType == ImageMergeOrientation.Horizontal ?
                imgs.Sum(img => img.Width) :
                imgs.Max(img => img.Width);

            var finalHeight = mergeType == ImageMergeOrientation.Vertical ?
                imgs.Sum(img => img.Height) :
                imgs.Max(img => img.Height);

            var finalImg = new Bitmap(finalWidth, finalHeight);
            Graphics g = Graphics.FromImage(finalImg);
            g.Clear(SystemColors.AppWorkspace);

            var width = finalWidth;
            var height = finalHeight;
            var nIndex = 0;
            foreach (FileInfo file in files)
            {
                Image img = Image.FromFile(file.FullName);
                if (nIndex == 0)
                {
                    g.DrawImage(img, new Point(0, 0));
                    nIndex++;
                    width = img.Width;
                    height = img.Height;
                }
                else
                {
                    switch (mergeType)
                    {
                        case ImageMergeOrientation.Horizontal:
                            g.DrawImage(img, new Point(width, 0));
                            width += img.Width;
                            break;
                        case ImageMergeOrientation.Vertical:
                            g.DrawImage(img, new Point(0, height));
                            height += img.Height;
                            break;
                        default:
                            throw new ArgumentOutOfRangeException("mergeType");
                    }
                }
                img.Dispose();
            }
            g.Dispose();
            finalImg.Save(finalImage, System.Drawing.Imaging.ImageFormat.Tiff);
            finalImg.Dispose();
        }

代码说明：

根据参数进行横向或纵向合并图片

如果为横向，图片高度为最高的那张；如果纵向则宽度为最宽的那张

UT 代码：

[TestMethod]
        public void Combine_Multiple_SampleImages_IntoOne()
        {
            const string folderPath = "C:\\Users\\Public\\Pictures\\Sample Pictures";
            var images = new DirectoryInfo(folderPath).GetFiles("*.jpg", SearchOption.TopDirectoryOnly);

            CombineImages(images, "C:/FinalImage_H.tiff");
            CombineImages(images, "C:/FinalImage_V.tiff", ImageMergeOrientation.Vertical);
        }