安裝Openxml sdk
首先,我們先安裝nuget的需要的有關的Openxml sdk,我們開源瞭解析pptx的Openxml拍平層,下面兩種方式都可以安裝:
- nuget包管理器控制檯:
Install-Package dotnetCampus.DocumentFormat.OpenXml.Flatten -Version 2.0.0
- csproj引用:
<PackageReference Include="dotnetCampus.DocumentFormat.OpenXml.Flatten" Version="2.0.0" />
解析Pptx
我這裡用PPTX的7種直線,分別設定7種能夠設定的虛線型別,PPTX的顯示效果是這樣的:
然後解析程式碼如下,解析主要邏輯部分:
private void PptxToGeometry(string filePath)
{
if (!File.Exists(filePath) || !filePath.EndsWith(".pptx", StringComparison.OrdinalIgnoreCase))
{
return;
}
var lines = new List<Line>();
using var presentationDocument = PresentationDocument.Open(filePath, false);
var presentationPart = presentationDocument.PresentationPart;
var presentation = presentationPart?.Presentation;
var slideIdList = presentation?.SlideIdList;
if (slideIdList == null)
{
return;
}
foreach (var slideId in slideIdList.ChildElements.OfType<SlideId>())
{
var slidePart = (SlidePart)presentationPart.GetPartById(slideId.RelationshipId);
var slide = slidePart.Slide;
foreach (var shapeProperties in slide.Descendants<ShapeProperties>())
{
var presetGeometry = shapeProperties.GetFirstChild<PresetGeometry>();
if (presetGeometry != null && presetGeometry.Preset.HasValue)
{
if (presetGeometry.Preset == ShapeTypeValues.StraightConnector1)
{
var transform2D = shapeProperties.GetFirstChild<Transform2D>();
var extents = transform2D?.GetFirstChild<Extents>();
if (extents != null)
{
var width = new Emu(extents.Cx!.Value).ToPixel().Value;
var height = new Emu(extents.Cy!.Value).ToPixel().Value;
var presetDash = shapeProperties.GetFirstChild<Outline>()?.GetFirstChild<PresetDash>()?.Val;
var dashArray = GetDashArrayByPresetLineDashValues(presetDash);
var line = ConverterToGeometry( width, height, dashArray);
lines.Add(line);
}
}
}
}
}
this.ListBox.ItemsSource = lines;
}
PPTX對映成WPF虛線的方法:
private DoubleCollection GetDashArrayByPresetLineDashValues(PresetLineDashValues presetLineDashValues)
{
DoubleCollection dashStyle = presetLineDashValues switch
{
PresetLineDashValues.Solid => new(),
PresetLineDashValues.Dot => new() { 0, 2 },
PresetLineDashValues.Dash => new() { 3, 3 },
PresetLineDashValues.LargeDash => new() { 8, 3 },
PresetLineDashValues.DashDot => new() { 3, 3, 1, 3 },
PresetLineDashValues.LargeDashDot => new() { 7.5, 3.5, 1, 3.5 },
PresetLineDashValues.LargeDashDotDot => new() { 8, 3, 1, 3, 1, 3 },
PresetLineDashValues.SystemDash => new() { 3, 1 },
PresetLineDashValues.SystemDot => new() { 1, 1 },
PresetLineDashValues.SystemDashDot => new() { 2, 2, 0, 2 },
PresetLineDashValues.SystemDashDotDot => new() { 2, 2, 0, 2 },
_ => new DoubleCollection()
};
return dashStyle;
}
最終繪製線條的方法:
private Line ConverterToGeometry(double width, double height, DoubleCollection dashDoubleCollection)
{
var line = new Line
{
X1 = 0,
Y1 = 0,
X2 = width,
Y2 = height,
StrokeDashArray = dashDoubleCollection,
Stroke = Stroke,
StrokeThickness = StrokeThickness
};
return line;
}
最終的效果:
我們可以看到幾乎是接近的效果了,當然你也可以根據我的程式碼去微調更精確的值,只需要稍微改下GetDashArrayByPresetLineDashValues
方法內相對應的值即可
後話
實際上,openxml文件是給出了PresetDash的值的,大致如下:
但是其值跟WPF的設定Dash的DoubleCollection
不對應,因此以上的對映值都是我自己微調的
原始碼
BlogCodeSample/PptDashConverToWpfSample at main · ZhengDaoWang/BlogCodeSample