/// <summary>
/// 构建 Path 字符串，这里输出的是 svg 路径格式，可以作为 WPF 或 UWP 的 Geometry 字符串
/// </summary>
/// <param name="pathList"></param>
/// 有关 Geometry 使用字符串表示方式请自行百度 “svg 路径 格式”
public static (string stringPath, bool isLine) BuildPathString(PathList pathList)
{
var stringPath = new StringBuilder(128);
bool isLine = true;
foreach (var path in pathList.Elements <DocumentFormat.OpenXml.Drawing.Path>())
{
EmuPoint currentPixelPoint = default;
foreach (var pathData in path.ChildElements)
{
currentPixelPoint =
ConvertToPathString(pathData, stringPath, currentPixelPoint, out var isPathLine);
if (!isPathLine)
{
isLine = false;
}
}
}
return(stringPath.ToString(), isLine);
}
private static EmuPoint ConvertToPathString(OpenXmlElement pathData, StringBuilder stringPath,
EmuPoint currentPoint, out bool isLine)
{
isLine = true;
switch (pathData)
{
case MoveTo moveTo:
{
// 关于定义的 Key 的值请百度参考 svg 规范
var defineKey = "M";
var moveToPoint = moveTo.Point;
if (moveToPoint?.X != null && moveToPoint?.Y != null)
{
stringPath.Append(defineKey);
var emuPoint = moveToPoint.PointToEmuPoint();
var point = emuPoint.ToPixelPoint();
PointToString(point);
return(emuPoint);
}
break;
}
case LineTo lineTo:
{
var defineKey = "L";
var lineToPoint = lineTo.Point;
if (lineToPoint?.X != null && lineToPoint?.Y != null)
{
stringPath.Append(defineKey);
var emuPoint = lineToPoint.PointToEmuPoint();
var point = emuPoint.ToPixelPoint();
PointToString(point);
return(emuPoint);
}
break;
}
case ArcTo arcTo:
{
Degree swingAngDegree = new Degree(0);
var swingAngleString = arcTo.SwingAngle;
if (swingAngleString != null)
{
if (int.TryParse(swingAngleString, out var swingAngle))
{
swingAngDegree = new Degree(swingAngle);
}
}
Degree startAngleDegree = new Degree(0);
var startAngleString = arcTo.StartAngle;
if (startAngleString != null)
{
if (int.TryParse(startAngleString.Value, out var startAngle))
{
startAngleDegree = new Degree(startAngle);
}
}
var widthRadius = EmuStringToEmu(arcTo.WidthRadius);
var heightRadius = EmuStringToEmu(arcTo.HeightRadius);
return(ArcToToString(stringPath, currentPoint, widthRadius, heightRadius,
startAngleDegree, swingAngDegree));
}
case QuadraticBezierCurveTo quadraticBezierCurveTo:
{
var defineKey = "Q";
return(ConvertPointList(quadraticBezierCurveTo, defineKey, stringPath));
}
case CubicBezierCurveTo cubicBezierCurveTo:
{
var defineKey = "C";
return(ConvertPointList(cubicBezierCurveTo, defineKey, stringPath));
}
case CloseShapePath closeShapePath:
{
var defineKey = "Z";
isLine = false;
stringPath.Append(defineKey);
break;
}
}
return(default);