d09bb30cec
git-svn-id: file:///srv/devel/repo-conversion/nusu@19 d2e56fa2-650e-0410-a79f-9358c0239efd
93 lines
3.5 KiB
C#
93 lines
3.5 KiB
C#
#region CPL License
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/*
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Nuclex Framework
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Copyright (C) 2002-2007 Nuclex Development Labs
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This library is free software; you can redistribute it and/or
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modify it under the terms of the IBM Common Public License as
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published by the IBM Corporation; either version 1.0 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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IBM Common Public License for more details.
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You should have received a copy of the IBM Common Public
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License along with this library
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using Microsoft.Xna.Framework;
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namespace Nuclex.Support.Packing {
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/// <summary>Simplified packer for rectangles which don't vary greatly in size</summary>
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/// <remarks>
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/// This is a highly performant packer that sacrifices space efficiency for
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/// low memory usage and runtime performance. It achieves good results with
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/// near-uniform sized rectangles but will waste lots of space with rectangles
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/// of varying dimensions.
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/// </remarks>
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public class CygonRectanglePacker : RectanglePacker {
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/// <summary>Initializes a new rectangle packer</summary>
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/// <param name="maxPackingAreaWidth">Maximum width of the packing area</param>
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/// <param name="maxPackingAreaHeight">Maximum height of the packing area</param>
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public CygonRectanglePacker(int maxPackingAreaWidth, int maxPackingAreaHeight)
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: base(maxPackingAreaWidth, maxPackingAreaHeight) { }
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/// <summary>Tries to allocate space for a rectangle in the packing area</summary>
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/// <param name="rectangleWidth">Width of the rectangle to allocate</param>
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/// <param name="rectangleHeight">Height of the rectangle to allocate</param>
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/// <param name="placement">Output parameter receiving the rectangle's placement</param>
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/// <returns>True if space for the rectangle could be allocated</returns>
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public override bool TryAllocate(
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int rectangleWidth, int rectangleHeight, out Point placement
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) {
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// If the rectangle is larger than the packing area in any dimension,
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// it will never fit!
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if(
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(rectangleWidth > MaxPackingAreaWidth) || (rectangleHeight > MaxPackingAreaHeight)
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) {
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placement = Point.Zero;
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return false;
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}
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// Do we have to start a new line ?
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if(this.column + rectangleWidth > MaxPackingAreaWidth) {
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this.currentLine += this.lineHeight;
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this.lineHeight = 0;
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this.column = 0;
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}
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// If it doesn't fit vertically now, the packing area is considered full
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if(this.currentLine + rectangleHeight > MaxPackingAreaHeight) {
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placement = Point.Zero;
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return false;
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}
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// The rectangle appears to fit at the current location
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placement = new Point(this.column, this.currentLine);
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this.column += rectangleWidth; // Can be larger than cache width till next run
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if(rectangleHeight > this.lineHeight)
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this.lineHeight = rectangleHeight;
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return true;
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}
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/// <summary>Current packing line</summary>
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private int currentLine;
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/// <summary>Height of the current packing line</summary>
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private int lineHeight;
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/// <summary>Current column in the current packing line</summary>
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private int column;
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}
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} // namespace Nuclex.Support.Packing
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