GraphicsPathIterator.cs :  » 2.6.4-mono-.net-core » System.Drawing » System » Drawing » Drawing2D » C# / CSharp Open Source

//
// System.Drawing.Drawing2D.GraphicsPathIterator.cs
//
// Author:
//   Dennis Hayes (dennish@Raytek.com)
//   Duncan Mak (duncan@ximian.com)
//   Ravindra (rkumar@novell.com)
//
// Copyright (C) 2002/3 Ximian, Inc (http://www.ximian.com)
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Drawing;

namespace System.Drawing.Drawing2D{
  public sealed class GraphicsPathIterator : MarshalByRefObject, IDisposable
  {
    private IntPtr nativeObject = IntPtr.Zero;

    // Constructors
    internal GraphicsPathIterator (IntPtr native)
    {
      this.nativeObject = native;
    }

    public GraphicsPathIterator (GraphicsPath path)
    {
      if (path != null) {
        Status status = GDIPlus.GdipCreatePathIter (out nativeObject, path.NativeObject);
        GDIPlus.CheckStatus (status);
      }
    }

    internal IntPtr NativeObject {
      get {
        return nativeObject;
      }
      set {
        nativeObject = value;
      }
    }

    // Public Properites

    public int Count {
      get {
        if (nativeObject == IntPtr.Zero)
          return 0;
 
        int count;
        Status status = GDIPlus.GdipPathIterGetCount (nativeObject, out count);
        GDIPlus.CheckStatus (status);

        return count;
      }
    }

    public int SubpathCount {
      get {
        int count;
        Status status = GDIPlus.GdipPathIterGetSubpathCount (nativeObject, out count);
        GDIPlus.CheckStatus (status);

        return count;
      }
    }

    internal void Dispose (bool disposing)
    {
      Status status;
      if (nativeObject != IntPtr.Zero) {
        status = GDIPlus.GdipDeletePathIter (nativeObject);
        GDIPlus.CheckStatus (status);

        nativeObject = IntPtr.Zero;
      }
    }

    // Public Methods.

    public int CopyData (ref PointF [] points, ref byte [] types, int startIndex, int endIndex)
    {
      Status status;
      int resultCount;

      // no null checks, MS throws a NullReferenceException here
      if (points.Length != types.Length)
        throw new ArgumentException ("Invalid arguments passed. Both arrays should have the same length.");

      status = GDIPlus.GdipPathIterCopyData (nativeObject, out resultCount, points, types, startIndex, endIndex);
      GDIPlus.CheckStatus (status);

      return resultCount;
    }

    public void Dispose ()
    {
      Dispose (true);
      System.GC.SuppressFinalize (this);
    }

    ~GraphicsPathIterator ()
    {
      Dispose (false);
    }

    public int Enumerate (ref PointF [] points, ref byte [] types)
    {
      Status status;
      int resultCount;
      // no null checks, MS throws a NullReferenceException here
      int count = points.Length;
      if (count != types.Length)
        throw new ArgumentException ("Invalid arguments passed. Both arrays should have the same length.");

      status = GDIPlus.GdipPathIterEnumerate (nativeObject, out resultCount, points, types, count);
      GDIPlus.CheckStatus (status);

      return resultCount;
    }

    public bool HasCurve ()
    {
      bool curve;
      Status status = GDIPlus.GdipPathIterHasCurve (nativeObject, out curve);
      GDIPlus.CheckStatus (status);

      return curve;
    }

    public int NextMarker (GraphicsPath path)
    {
      int resultCount;
      IntPtr ptr = (path == null) ? IntPtr.Zero : path.NativeObject;
      Status status = GDIPlus.GdipPathIterNextMarkerPath (nativeObject, out resultCount, ptr);
      GDIPlus.CheckStatus (status);

      return resultCount;
    }

    public int NextMarker (out int startIndex, out int endIndex)
    {
      Status status;
      int resultCount;
      status = GDIPlus.GdipPathIterNextMarker (nativeObject, out resultCount, out startIndex, out endIndex);
      GDIPlus.CheckStatus (status);

      return resultCount;
    }

    public int NextPathType (out byte pathType, out int startIndex, out int endIndex)
    {
      Status status;
      int resultCount;
      status = GDIPlus.GdipPathIterNextPathType (nativeObject, out resultCount, out pathType, out startIndex, out endIndex);
      GDIPlus.CheckStatus (status);

      return resultCount;
    }

    public int NextSubpath (GraphicsPath path, out bool isClosed)
    {
      int resultCount;
      IntPtr ptr = (path == null) ? IntPtr.Zero : path.NativeObject;
      Status status = GDIPlus.GdipPathIterNextSubpathPath (nativeObject, out resultCount, ptr, out isClosed);
      GDIPlus.CheckStatus (status);

      return resultCount;
    }

    public int NextSubpath (out int startIndex, out int endIndex, out bool isClosed)
    {
      Status status;
      int resultCount;
      status = GDIPlus.GdipPathIterNextSubpath (nativeObject, out resultCount, out startIndex, out endIndex, out isClosed);
      GDIPlus.CheckStatus (status);

      return resultCount;
    }

    public void Rewind ()
    {
      Status status = GDIPlus.GdipPathIterRewind (nativeObject);
      GDIPlus.CheckStatus (status);
    }
  }
}