编程技术分享 - 2024年8月
type: channel
link: https://www.codespool.com/index.php/2024/08/
description: Your description here.
items: 关于盖章软件骑缝章第一个处理的PDF是单页导致后面多页无骑缝章的问题
items: WPF_CheckBox
items: WPF使用System.Windows.Media.Imaging 旋转图片需要注意的问题
items: WPF_修改图像大小、旋转、透明度
items: FFmpeg如何给视频添加指定动态时间戳_FFmpeg7.1_Windows

关于盖章软件骑缝章第一个处理的PDF是单页导致后面多页无骑缝章的问题
type: item
date: 2024-08-26T08:47:31+08:00
description: 核心问题 由于一个处理的不是骑缝章 ModifyRidingSeamStampWidth和ModifyRidingSeamStampHeight 为0 // 将骑缝章的cm尺寸转化为px (double widthPx, double heightPx) = ImageUtilities.CentimetersToPixels(RidingSeamStampWidth, RidingSeamStampHeight, RidingSeamStampDpiX, RidingSeamStampDpiY); // 调整图片大小、透明度 BitmapSource modifyImage = ImageUtilities.ModifyImage(RidingSeamStampFilePath, widthPx, heightPx, RidingSeamStampTransparency); // 将骑缝章的像素尺寸转化为point (double widthPt, double heightPt) = ImageUtilities.PixelsToPoints(modifyImage.PixelWidth, modifyImage.PixelHeight, RidingSeamStampDpiX, RidingSeamStampDpiY); // 调整骑缝章尺寸 modifyImage = ImageUtilities.ResizeBitmapSource(modifyImage, widthPt, heightPt); // 获取调整后骑缝章图片的宽度和高度 ModifyRidingSeamStampWidth = widthPt; ModifyRidingSeamStampHeight = heightPt;// 调整图片大小 img.ScaleAbsolute((float)ModifyRidingSeamStampWidth, (float)ModifyRidingSeamStampHeight);

WPF_CheckBox
type: item
date: 2024-08-21T01:59:44+08:00
description: <CheckBox.Style> </CheckBox.Style>

WPF使用System.Windows.Media.Imaging 旋转图片需要注意的问题
type: item
date: 2024-08-17T01:13:43+08:00
description: 如果非圆形图像，旋转的时候需要计算旋转后的画布尺寸，不然的话会导致旋转后显示的图像不全，最后将将图像绘制在新的中心位置。// 修改图片大小、旋转角度、透明度 （印章）(预览) public static BitmapSource ModifyImage(string imagePath, double newWidth, double newHeight, double rotationAngle, double stampTransparency) { // 加载图像 BitmapImage bitmap = new BitmapImage(new Uri(imagePath)); // 调整图像尺寸 TransformedBitmap resizedBitmap = new TransformedBitmap(bitmap, new ScaleTransform(newWidth / bitmap.PixelWidth, newHeight / bitmap.PixelHeight)); // 计算旋转后的画布尺寸 double radians = rotationAngle * Math.PI / 180; double sin = Math.Abs(Math.Sin(radians)); double cos = Math.Abs(Math.Cos(radians)); double rotatedWidth = resizedBitmap.PixelWidth * cos + resizedBitmap.PixelHeight * sin; double rotatedHeight = resizedBitmap.PixelWidth * sin + resizedBitmap.PixelHeight * cos; // 创建一个新的 DrawingVisual DrawingVisual drawingVisual = new DrawingVisual(); using (DrawingContext drawingContext = drawingVisual.RenderOpen()) { // 计算新的中心点 double centerX = rotatedWidth / 2; double centerY = rotatedHeight / 2; // 创建旋转变换 RotateTransform rotateTransform = new RotateTransform(rotationAngle, centerX, centerY); // 设置透明度 drawingContext.PushOpacity(stampTransparency); // 应用旋转并绘制图像 drawingContext.PushTransform(rotateTransform); // 将图像绘制在新的中心位置 drawingContext.DrawImage(resizedBitmap, new Rect((rotatedWidth - resizedBitmap.PixelWidth) / 2, (rotatedHeight - resizedBitmap.PixelHeight) / 2, resizedBitmap.PixelWidth, resizedBitmap.PixelHeight)); // 弹出变换和透明度设置 drawingContext.Pop(); drawingContext.Pop(); } // 将Visual渲染为BitmapSource，使用旋转后的画布尺寸 RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap((int)Math.Ceiling(rotatedWidth), (int)Math.Ceiling(rotatedHeight), bitmap.DpiX, bitmap.DpiY, PixelFormats.Pbgra32); renderTargetBitmap.Render(drawingVisual); return renderTargetBitmap; } // 修改图片旋转角度、透明度（印章）（PDF） public static BitmapSource ModifyImage(string imagePath, double rotationAngle, double stampTransparency) { // 加载图像 BitmapImage bitmap = new BitmapImage(new Uri(imagePath)); // 计算旋转后的画布尺寸 double ra…

WPF_修改图像大小、旋转、透明度
type: item
date: 2024-08-16T03:49:00+08:00
description: 1.使用 TransformedBitmap 类（System.Windows.Media.Imaging）可以对图片进行缩放操作。var originalBitmap = new BitmapImage(new Uri("yourImagePath")); // 缩放图片 var scaleTransform = new ScaleTransform(0.5, 0.5); // 缩放比例：50% var scaledBitmap = new TransformedBitmap(originalBitmap, scaleTransform); // 旋转图片 var rotateTransform = new RotateTransform(45); // 旋转45度 var transformedBitmap = new TransformedBitmap(scaledBitmap, rotateTransform); // 设置图片源 imageControl.Source = transformedBitmap; // 设置透明度 imageControl.Opacity = 0.5; // 透明度设置为50% 2.System.Drawing (GDI+)public static Bitmap ModifyImage(string imagePath, double newWidth, double newHeight, double rotationAngle, double stampTransparency, bool isCircle) { // 加载图像 Bitmap image = new Bitmap(imagePath); // 修改图像大小 Bitmap resizedImage = new Bitmap((int)Math.Round(newWidth), (int)Math.Round(newHeight)); using (Graphics g = Graphics.FromImage(resizedImage)) { // 设置高质量插值法和抗锯齿模式 g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.SmoothingMode = SmoothingMode.AntiAlias; g.PixelOffsetMode = PixelOffsetMode.HighQuality; // 绘制缩放后的图像 g.DrawImage(image, 0, 0, resizedImage.Width, resizedImage.Height); } Bitmap finalImage; // 仅保留圆形处理的代码 if (isCircle) { finalImage = new Bitmap(resizedImage.Width, resizedImage.Height, PixelFormat.Format32bppArgb); using (Graphics g = Graphics.FromImage(finalImage)) { // 清除背景(透明) g.Clear(Color.Transparent); // 设置旋转中心为图像的中心 g.TranslateTransform((float)resizedImage.Width / 2, (float)resizedImage.Height / 2); // 旋转图像 g.RotateTransform((float)-rotationAngle); // 重置变换矩阵回原点 g.TranslateTransform(-(float)resizedImage.Width / 2, -(float)resizedImage.Height / 2); // 绘制图像 g.DrawImage(resizedImage, new Point(0, 0)); } } // 设置透明度 if (stampTransparency >= 0) { // 创建一个新的位图，用于保存透明度应用后的图像 Bitmap transparentImage = new Bitmap(finalImage.Width, finalImage.Height, PixelFormat.Format32bppArgb); using (Graphics g = Graphics.FromImage(transparentImage)) { // 使用颜色矩阵应用透明度 ColorMatrix colorMatrix = new ColorMatrix { Matrix33 = (float)(stamp…

FFmpeg如何给视频添加指定动态时间戳_FFmpeg7.1_Windows
type: item
date: 2024-08-08T17:11:00+08:00
description: 样式：2024年08月06日 19:31:48ffmpeg -i C:\Users\az102\Desktop\input.mp4 -vf "drawtext=fontfile='C\:/Windows/Fonts/simsun.ttc':text='%{pts\:localtime\:1722943908\:%Y年%m月%d日 %H\\\:%M\\\:%S}':x=100:y=100:fontsize=24:fontcolor=white:box=1:boxcolor=0x00000000" -codec:a copy C:\Users\az102\Desktop\output.mp4样式：2024\12\19 08:40:05ffmpeg -i C:\Users\az102\Desktop\input.mp4 -vf "drawtext=fontfile='C\:/Windows/Fonts/msyh.ttc':text='%{pts\:localtime\:1734568805\:%Y\\\\%m\\\\%d %H\\\:%M\\\:%S}':x=100:y=100:fontsize=19:fontcolor=white:box=1:boxcolor=0x00000000" -codec:a copy C:\Users\az102\Desktop\output.mp4样式：2024/12/19 08:40:05ffmpeg -i C:\Users\az102\Desktop\input.mp4 -vf "drawtext=fontfile='C\:/Windows/Fonts/msyhbd.ttc':text='%{pts\:localtime\:1734568805\:%Y/%m/%d %H\\\:%M\\\:%S}':x=100:y=100:fontsize=19:fontcolor=white:box=1:boxcolor=0x00000000" -codec:a copy C:\Users\az102\Desktop\output.mp4样式：ffmpeg -i C:\Users\az102\Desktop\video\input.mp4 -vf "drawtext=fontfile='C\:/Windows/Fonts/ARIALBD.TTF':text='%{pts\:localtime\:1734568805\:%Y/%m/%d %H\\\:%M\\\:%S}':x=100:y=100:fontsize=20.5:fontcolor=white:box=1:boxcolor=0x00000000, drawtext=fontfile='C\:/Windows/Fonts/ARIALBD.TTF':text='V800000_000000':x=100:y=125:fontsize=20.5:fontcolor=white:box=1:boxcolor=0x00000000" -codec:a copy C:\Users\az102\Desktop\output.mp4