功能用處：

對svg文件的路徑節點填充時會使用(相鄰兩個坐標區域內的四邊形的填充顏色不重復)。

需要對svg文件中的Path節點或者 Polyline?節點做顏色填充.并且相鄰的兩個區域之間的顏色不允許重復。

代碼如下：

/// <summary>/// 根據svg節點對象類型和路徑值轉換成標準的坐標值/// </summary>/// <param name="pointType">線條類型,可以是 Path 或者 Polyline</param>/// <param name="pointValue">/// 線條值/// <para>如 Path 節點的“d”屬性</para>/// <para>如 Polyline 節點的“points”屬性</para>/// </param>/// <returns>返回浮點類型的二維平面坐標點集合</returns>IList<PointF> ConvertPoints(string pointType, string pointValue){IList<PointF> points = new List<PointF>();string[] pointArray = { };if (pointType.ToLower() == "points"){//Polyline 節點pointArray = pointValue.Split(new char[] { ' ', ',' });for (int i = 0; i < pointArray.Length; i = i + 2){if (i + 1 >= pointArray.Length)break;if (string.IsNullOrEmpty(pointArray[i]) || string.IsNullOrEmpty(pointArray[i + 1]))continue;try{PointF item = new PointF();item.X = float.Parse(pointArray[i]);item.Y = float.Parse(pointArray[i + 1]);points.Add(item);}catch (Exception){throw;}}}else if (pointType.ToLower() == "d"){//Path 節點if (!pointValue.StartsWith("m")){return new List<PointF>();}pointValue = pointValue.Substring(1);PointF prePos = new PointF();//過濾掉 path 路徑符號pointArray = pointValue.Split(new char[] { ' ', 'c', 'l', 's', 'v', 'q', 't', 'm', 'z' });foreach (string thisPoint in pointArray){if (string.IsNullOrEmpty(thisPoint))continue;try{string[] pThis = thisPoint.Split(',');PointF item = new PointF();item.X = prePos.X + float.Parse(pThis[0]);item.Y = prePos.Y + float.Parse(pThis[1]);points.Add(item);prePos = item;}catch (Exception){throw;}}}return points;}

然后根據坐標集合獲取一個?四邊形的坐標對象：

/// <summary>/// 根據節點ID和節點坐標的二維平面x,y坐標集合獲取坐標值對象/// </summary>/// <param name="points">浮點類型的二維平面坐標點集合</param>/// <param name="nodeId">Svg節點ID</param>/// <returns>Svg位置對象</returns>public ObjectPosition GetObjectPosition(IList<PointF> points, string nodeId){ObjectPosition thisPos = new ObjectPosition(nodeId);for (int i = 0; i < points.Count; i++){PointF pos = points[i];if (i == 0){thisPos.Init(pos.X, pos.Y);}else{thisPos.SetPoint(pos.X, pos.Y);}}return thisPos;}

然后初始化坐標，并且獲取四邊形的坐標值：

/// <summary>/// 初始化坐標/// </summary>/// <param name="x"></param>/// <param name="y"></param>public void Init(float x, float y){X1 = x;X2 = x;Y1 = y;Y2 = y;}/// <summary>/// 設置四邊形坐標值/// <remarks>原則：大中取大,小中取小.</remarks>/// </summary>/// <param name="x"></param>/// <param name="y"></param>public void SetPoint(float x, float y){if (x < X1) X1 = x;else if (x > X2) X2 = x;if (y < Y1) Y1 = y;else if (y > Y2) Y2 = y;}

最后使用：

/// <summary>/// 通過svg文件或者加載的Svg內容獲取svg對象的坐標對象/// </summary>/// <returns>/// <para>key：節點名稱</para>/// <para>value：節點坐標對象</para>/// </returns>public Dictionary<string, ObjectPosition> GetSvgObjectPositions(){Dictionary<string, ObjectPosition> mapList = new Dictionary<string, ObjectPosition>();HtmlAgilityPack.HtmlDocument document = new HtmlAgilityPack.HtmlDocument();//加載Svg內容document.LoadHtml(this.SvgString);var polylines = document.DocumentNode.SelectNodes("//polyline");if (polylines != null){for (int i = 0; i < polylines.Count; i++){if (polylines[i].Attributes["id"] == null)continue;if (polylines[i].Attributes["points"] == null)continue;string nodeId = polylines[i].Attributes["id"].Value;IList<PointF> points = this.ConvertPoints("points", polylines[i].Attributes["points"].Value);ObjectPosition posInfo = this.GetObjectPosition(points, nodeId);mapList.Add(posInfo.NodeID, posInfo);}}var paths = document.DocumentNode.SelectNodes("//path");if (paths != null){for (int i = 0; i < paths.Count; i++){if (paths[i].Attributes["id"] == null)continue;if (paths[i].Attributes["d"] == null)continue;string nodeId = paths[i].Attributes["id"].Value;IList<PointF> points = this.ConvertPoints("d", paths[i].Attributes["d"].Value);ObjectPosition posInfo = this.GetObjectPosition(points, nodeId);mapList.Add(posInfo.NodeID, posInfo);}}return mapList;}

?

轉載于:https://www.cnblogs.com/easeyeah/p/GetSvgCoordinate.html

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