节能WPF InkCanvas为JPG - 图像裁剪得到
https://stackoverflow.com/questions/1234447
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我有我使用捕捉到我的应用程序的签名的WPF InkCanvas控制。控制是这样的 - 这是700x300
然而，当我将其保存为JPG，所得到的图像是这样的，也700x300
我使用保存的代码
sigPath = System.IO.Path.GetTempFileName();
MemoryStream ms = new MemoryStream();
FileStream fs = new FileStream(sigPath, FileMode.Create);
RenderTargetBitmap rtb = new RenderTargetBitmap((int)inkSig.Width, (int)inkSig.Height, 96d, 96d, PixelFormats.Default);
rtb.Render(inkSig);
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(rtb));
encoder.Save(fs);
fs.Close();
这是我使用的XAML：
<Window x:Class="Consent.Client.SigPanel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Background="Transparent" Topmost="True" AllowsTransparency="True"
Title="SigPanel" Left="0" Top="0" Height="1024" Width="768" WindowStyle ="None" ShowInTaskbar="False" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" >
<Border BorderThickness="1" BorderBrush="Black" Background='#FFFFFFFF' x:Name='DocumentRoot' Width='750' Height='400' CornerRadius='10'>
<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBlock Name="txtLabel" FontSize="24" HorizontalAlignment="Center" >Label</TextBlock>
<InkCanvas Opacity="1" Background="Beige" Name="inkSig" Width="700" Height="300" />
<StackPanel HorizontalAlignment="Center" Orientation="Horizontal">
<Button FontSize="24" Margin="10" Width="150" Name="btnSave" Click="btnSave_Click">Save</Button>
<Button FontSize="24" Margin="10" Width="150" Name="btnCancel" Click="btnCancel_Click">Cancel</Button>
<Button FontSize="24" Margin="10" Width="150" Name="btnClear" Click="btnClear_Click">Clear</Button>
</StackPanel>
</StackPanel>
</Border>
在过去，这完美地工作。我不能找出改变，导致该图像时，它被保存到移位。
解决方案
啊哈！问题是将TextBlock txtLabel 即直接在InkCanvas上方。当删除了黑色线消失。
至于为什么会发生的事情，我不是很确定呢。
其他提示
我有我做这样同样的问题..它的工作在这里..
private void Button_Click(object sender, RoutedEventArgs e)
{
double width = inkSig.ActualWidth;
double height = inkSig.ActualHeight;
RenderTargetBitmap bmpCopied = new RenderTargetBitmap((int)Math.Round(width), (int)Math.Round(height), 96, 96, PixelFormats.Default);
DrawingVisual dv = new DrawingVisual();
using (DrawingContext dc = dv.RenderOpen())
{
VisualBrush vb = new VisualBrush(inkSig);
dc.DrawRectangle(vb, null, new Rect(new System.Windows.Point(), new System.Windows.Size(width, height)));
}
bmpCopied.Render(dv);
System.Drawing.Bitmap bitmap;
using (MemoryStream outStream = new MemoryStream())
{
// from System.Media.BitmapImage to System.Drawing.Bitmap
BitmapEncoder enc = new BmpBitmapEncoder();
enc.Frames.Add(BitmapFrame.Create(bmpCopied));
enc.Save(outStream);
bitmap = new System.Drawing.Bitmap(outStream);
}
EncoderParameter qualityParam =
new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 85L);
// Jpeg image codec
ImageCodecInfo jpegCodec = getEncoderInfo("image/jpeg");
if (jpegCodec == null)
return;
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = qualityParam;
Bitmap btm = new Bitmap(bitmap);
bitmap.Dispose();
btm.Save("C:\\Users\\Pd\\Desktop\\dfe12.jpg", jpegCodec, encoderParams);
btm.Dispose();
}
private ImageCodecInfo getEncoderInfo(string mimeType)
{
// Get image codecs for all image formats
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
// Find the correct image codec
for (int i = 0; i < codecs.Length; i++)
if (codecs[i].MimeType == mimeType)
return codecs[i];
return null;
}
我类保存图像
using System;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
public void ExportToJpeg(String path, InkCanvas surface)
{
double
x1 = surface.Margin.Left,
x2 = surface.Margin.Top,
x3 = surface.Margin.Right,
x4 = surface.Margin.Bottom;
if (path == null) return;
surface.Margin = new Thickness(0, 0, 0, 0);
Size size = new Size(surface.Width, surface.Height);
surface.Measure(size);
surface.Arrange(new Rect(size));
RenderTargetBitmap renderBitmap =
new RenderTargetBitmap(
(int)size.Width,
(int)size.Height,
96,
96,
PixelFormats.Default);
renderBitmap.Render(surface);
using (FileStream fs = File.Open(path, FileMode.Create))
{
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
encoder.Save(fs);
}
surface.Margin = new Thickness(x1, x2, x3, x4);
}
和 surface.Margin =新厚度（55,40,96,5）; http://img519.imageshack.us/img519/7499/mynewimage.png
杰森，我解决了这个问题。
对不起我的英语水平。我是俄国人。
你需要在inkCanvas.Margin一套物业0,0,0,0
用：
surface.Margin = new Thickness(0, 0, 0, 0);
后在你的位置保存集裕度。
var size = new Size(inkCanvas.ActualWidth, inkCanvas.ActualHeight);
inkCanvas.Margin = new Thickness(0, 0, 0, 0);
inkCanvas.Measure(size);
inkCanvas.Arrange(new Rect(size));
var encoder = new PngBitmapEncoder();
var bitmapTarget = new RenderTargetBitmap((int)size.Width, (int)size.Height, 96, 96, PixelFormats.Default);
bitmapTarget.Render(inkCanvas);
encoder.Frames.Add(BitmapFrame.Create(bitmapTarget));
encoder.Save(ms);
我一直在寻找所有的网为回答这个问题，并试图大部分意见，没有任何的喜悦。然后，我想这和它的工作！
<Canvas x:Name="editCanvas" Background="Transparent" ClipToBounds="True">
<InkCanvas EditingMode="Select" x:Name="inkCanvas" Background="Transparent" Height="562" Width="866">
</InkCanvas>
</Canvas>
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