GraphicsContext.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / GraphicsContext.cs / 1 / GraphicsContext.cs
                        

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

    /// 
    ///     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() {
        } 
        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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