GraphicsContext.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / GraphicsContext.cs / 1305376 / GraphicsContext.cs
                        

                        
                             
//------------------------------------------------------------------------------
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//-----------------------------------------------------------------------------
 
namespace System.Drawing { 
    using System;
    using System.Drawing.Drawing2D; 
    using System.Diagnostics;
    using System.Runtime.Versioning;

    ///  
    ///     Contains information about the context of a Graphics object.
    ///  
    internal class GraphicsContext : IDisposable { 
        /// 
        ///     The state that identifies the context. 
        /// 
        private int contextState;

        ///  
        ///     The context's translate transform.
        ///  
        private PointF transformOffset; 

        ///  
        ///     The context's clip region.
        /// 
        private Region clipRegion;
 
        /// 
        ///     The next context up the stack. 
        ///  
        private GraphicsContext nextContext;
 
        /// 
        ///     The previous context down the stack.
        /// 
        private GraphicsContext prevContext; 

        ///  
        ///     Flags that determines whether the context was created for a Graphics.Save() operation. 
        ///     This kind of contexts are cumulative across subsequent Save() calls so the top context
        ///     info is cumulative.  This is not the same for contexts created for a Graphics.BeginContainer() 
        ///     operation, in this case the new context information is reset.  See Graphics.BeginContainer()
        ///     and Graphics.Save() for more information.
        /// 
        bool isCumulative; 

        ///  
        ///     Private constructor disallowed. 
        /// 
        private GraphicsContext() { 
        }

        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)] 
        public GraphicsContext(Graphics g) {
            Matrix transform = g.Transform; 
            if (!transform.IsIdentity) { 
                float[] elements = transform.Elements;
                this.transformOffset.X = elements[4]; 
                this.transformOffset.Y = elements[5];
            }
            transform.Dispose();
 
            Region clip = g.Clip;
            if (clip.IsInfinite(g)) { 
                clip.Dispose(); 
            }
            else { 
                this.clipRegion = clip;
            }
        }
 
        /// 
        ///     Disposes this and all contexts up the stack. 
        ///  
        public void Dispose() {
            Dispose(true); 
            GC.SuppressFinalize(this);
        }

        ///  
        ///     Disposes this and all contexts up the stack.
        ///  
        public void Dispose(bool disposing) { 
            if (this.nextContext != null) {
                // Dispose all contexts up the stack since they are relative to this one and its state will be invalid. 
                this.nextContext.Dispose();
                this.nextContext = null;
            }
 
            if (this.clipRegion != null) {
                this.clipRegion.Dispose(); 
                this.clipRegion = null; 
            }
        } 

        /// 
        ///     The state id representing the GraphicsContext.
        ///  
        public int State {
            get { 
                return this.contextState; 
            }
            set { 
                this.contextState = value;
            }
        }
 
        /// 
        ///     The translate transform in the GraphicsContext. 
        ///  
        public PointF TransformOffset {
            get { 
                return this.transformOffset;
            }
        }
 
        /// 
        ///     The clipping region the GraphicsContext. 
        ///  
        public Region Clip {
            get { 
                return this.clipRegion;
            }
        }
 
        /// 
        ///     The next GraphicsContext object in the stack. 
        ///  
        public GraphicsContext Next {
            get { 
                return this.nextContext;
            }
            set {
                this.nextContext = value; 
            }
        } 
 
        /// 
        ///     The previous GraphicsContext object in the stack. 
        /// 
        public GraphicsContext Previous {
            get {
                return this.prevContext; 
            }
            set { 
                this.prevContext = value; 
            }
        } 

        /// 
        ///     Determines whether this context is cumulative or not.  See filed for more info.
        ///  
        public bool IsCumulative {
            get { 
                return this.isCumulative; 
            }
            set { 
                this.isCumulative = value;
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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