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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>Castle Game Engine: CastleRectangles: Object TRectangle</title>
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<h2>Castle Game Engine</h2><p><a href="introduction.html" class="navigation">Introduction</a></p><p><a href="AllUnits.html" class="navigation">Units</a></p><p><a href="ClassHierarchy.html" class="navigation">Class Hierarchy</a></p><p><a href="AllClasses.html" class="navigation">Classes, Interfaces, Objects and Records</a></p><p><a href="AllTypes.html" class="navigation">Types</a></p><p><a href="AllVariables.html" class="navigation">Variables</a></p><p><a href="AllConstants.html" class="navigation">Constants</a></p><p><a href="AllFunctions.html" class="navigation">Functions and Procedures</a></p><p><a href="AllIdentifiers.html" class="navigation">Identifiers</a></p></td><td class="content">
<a name="TRectangle"></a><h1 class="cio">Object TRectangle</h1>
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<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></td><td><a class="section" href="#PasDoc-Fields">Fields</a></td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td><a class="section" href="#PasDoc-Properties">Properties</a></td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
<p class="unitlink">
<a href="CastleRectangles.html">CastleRectangles</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TRectangle = object(TObject)</code></p>
<h2 class="description">Description</h2>
<p>
2D rectangle with integer coordinates. Useful for various 2D GUI operations.
<p>The area covered by the rectangle starts in (Left,Bottom) pixel and spans (Width,Height) pixels. This means that the <a class="normal" href="CastleRectangles.TRectangle.html#Right">right</a>-top pixel covered by the rectangle is (Left + Width - 1,Bottom + Height - 1). The rectangle is empty (<a class="normal" href="CastleRectangles.TRectangle.html#Contains">Contains</a> will always answer <code>False</code>) when either Width or Height are zero.</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TObject</li>
<li class="thisitem">TRectangle</li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Fields"></a><h3 class="summary">Fields</h3>
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<td class="itemcode"><code><b><a href="CastleRectangles.TRectangle.html#Left">Left</a></b>: Integer;</code></td>
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<td class="itemcode"><code><b><a href="CastleRectangles.TRectangle.html#Bottom">Bottom</a></b>: Integer;</code></td>
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<td class="itemcode"><code><b><a href="CastleRectangles.TRectangle.html#Width">Width</a></b>: Cardinal;</code></td>
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<td class="itemcode"><code><b><a href="CastleRectangles.TRectangle.html#Height">Height</a></b>: Cardinal;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleRectangles.TRectangle.html#Empty">Empty</a></b>: <a href="CastleRectangles.TRectangle.html">TRectangle</a> = (<a href="CastleRectangles.TRectangle.html#Left">Left</a>: 0; Bottom: 0; Width: 0; Height: 0);</code></td>
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<a name="PasDoc-Methods"></a><h3 class="summary">Methods</h3>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Contains">Contains</a></b>(const X, Y: Integer): boolean;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Contains">Contains</a></b>(const Point: <a href="CastleVectors.html#TVector2Single">TVector2Single</a>): boolean;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Contains">Contains</a></b>(const Point: <a href="CastleVectors.html#TVector2Integer">TVector2Integer</a>): boolean;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Center">Center</a></b>(const W, H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Grow">Grow</a></b>(const Delta: Integer): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Grow">Grow</a></b>(const DeltaX, DeltaY: Integer): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#RemoveLeft">RemoveLeft</a></b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#RemoveBottom">RemoveBottom</a></b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#RemoveRight">RemoveRight</a></b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#RemoveTop">RemoveTop</a></b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#GrowLeft">GrowLeft</a></b>(const W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#GrowBottom">GrowBottom</a></b>(const H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#GrowRight">GrowRight</a></b>(const W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#GrowTop">GrowTop</a></b>(const H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#LeftPart">LeftPart</a></b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#BottomPart">BottomPart</a></b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#RightPart">RightPart</a></b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#TopPart">TopPart</a></b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Middle">Middle</a></b>: <a href="CastleVectors.html#TVector2Integer">TVector2Integer</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#ClampX">ClampX</a></b>(const X: Integer): Integer;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#ClampY">ClampY</a></b>(const Y: Integer): Integer;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#ScaleToWidth">ScaleToWidth</a></b>(const NewWidth: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#ScaleToHeight">ScaleToHeight</a></b>(const NewHeight: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#AlignCore">AlignCore</a></b>( const ThisPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const X: Integer = 0): Integer;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Align">Align</a></b>( const ThisPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const X: Integer = 0): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#AlignCore">AlignCore</a></b>( const ThisPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const Y: Integer = 0): Integer;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#Align">Align</a></b>( const ThisPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const Y: Integer = 0): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRectangles.TRectangle.html#ToString">ToString</a></b>: string;</code></td>
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<a name="PasDoc-Properties"></a><h3 class="summary">Properties</h3>
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<td class="itemcode"><code>property <b><a href="CastleRectangles.TRectangle.html#Right">Right</a></b>: Integer read GetRight;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleRectangles.TRectangle.html#Top">Top</a></b>: Integer read GetTop;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleRectangles.TRectangle.html#LeftBottom">LeftBottom</a></b>: <a href="CastleVectors.html#TVector2Integer">TVector2Integer</a> read GetLeftBottom write SetLeftBottom;</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Fields</h3>
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<td class="itemcode"><a name="Left"></a><code><b>Left</b>: Integer;</code></td>
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<td class="itemcode"><a name="Bottom"></a><code><b>Bottom</b>: Integer;</code></td>
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<td class="itemcode"><a name="Width"></a><code><b>Width</b>: Cardinal;</code></td>
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<td class="itemcode"><a name="Height"></a><code><b>Height</b>: Cardinal;</code></td>
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<td class="itemcode"><a name="Empty"></a><code>internal const <b>Empty</b>: <a href="CastleRectangles.TRectangle.html">TRectangle</a> = (<a href="CastleRectangles.TRectangle.html#Left">Left</a>: 0; Bottom: 0; Width: 0; Height: 0);</code></td>
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<h3 class="detail">Methods</h3>
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<td class="itemcode"><a name="Contains"></a><code>function <b>Contains</b>(const X, Y: Integer): boolean;</code></td>
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<td class="itemcode"><a name="Contains"></a><code>function <b>Contains</b>(const Point: <a href="CastleVectors.html#TVector2Single">TVector2Single</a>): boolean;</code></td>
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<td class="itemcode"><a name="Contains"></a><code>function <b>Contains</b>(const Point: <a href="CastleVectors.html#TVector2Integer">TVector2Integer</a>): boolean;</code></td>
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<td class="itemcode"><a name="Center"></a><code>function <b>Center</b>(const W, H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<p>
Return rectangle with given width and height centered in the middle of this rectangle. The given W, H may be smaller or larger than this rectangle sizes.</p>
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<td class="itemcode"><a name="Grow"></a><code>function <b>Grow</b>(const Delta: Integer): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<p>
<a class="normal" href="CastleRectangles.TRectangle.html#Grow">Grow</a> (when Delta > 0) or shrink (when Delta < 0) the rectangle, returning new value. This adds a margin of Delta pixels around all sides of the rectangle, so in total width grows by 2 * Delta, and the same for height. In case of shrinking, we protect from shrinking too much: the resulting width or height is set to zero (which makes a valid and empty rectangle) if shrinking too much.</p>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="Grow"></a><code>function <b>Grow</b>(const DeltaX, DeltaY: Integer): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="RemoveLeft"></a><code>function <b>RemoveLeft</b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<p>
Returns the rectangle with a number of pixels from given side removed. Returns an empty rectangle if you try to remove too much. </p>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="RemoveBottom"></a><code>function <b>RemoveBottom</b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="RemoveRight"></a><code>function <b>RemoveRight</b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="RemoveTop"></a><code>function <b>RemoveTop</b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="GrowLeft"></a><code>function <b>GrowLeft</b>(const W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<p>
Returns the rectangle with a number of pixels on given side added. </p>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="GrowBottom"></a><code>function <b>GrowBottom</b>(const H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="GrowRight"></a><code>function <b>GrowRight</b>(const W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="GrowTop"></a><code>function <b>GrowTop</b>(const H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="LeftPart"></a><code>function <b>LeftPart</b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<p>
Returns the given side of the rectangle, cut down to given number of pixels from given side. This is similar to RemoveXxx methods, but here you specify which side to keep, as opposed to RemoveXxx methods where you specify which side you remove.
<p>If the requested size is larger than current size (for example, W > Width for <code>LeftPart</code>) then the unmodified rectangle is returned.
<p></p>
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<td class="itemcode"><a name="BottomPart"></a><code>function <b>BottomPart</b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="RightPart"></a><code>function <b>RightPart</b>(W: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="TopPart"></a><code>function <b>TopPart</b>(H: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="Middle"></a><code>function <b>Middle</b>: <a href="CastleVectors.html#TVector2Integer">TVector2Integer</a>;</code></td>
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<td class="itemcode"><a name="ClampX"></a><code>function <b>ClampX</b>(const X: Integer): Integer;</code></td>
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<p>
Clamp value to be within allowed horizontal range. That is, clamp to <code>[Left, <a class="normal" href="CastleRectangles.TRectangle.html#Right">Right</a> - 1]</code>.</p>
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<td class="itemcode"><a name="ClampY"></a><code>function <b>ClampY</b>(const Y: Integer): Integer;</code></td>
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<p>
Clamp value to be within allowed vertical range. That is, clamp to <code>[Bottom, Top - 1]</code>.</p>
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<td class="itemcode"><a name="ScaleToWidth"></a><code>function <b>ScaleToWidth</b>(const NewWidth: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="ScaleToHeight"></a><code>function <b>ScaleToHeight</b>(const NewHeight: Cardinal): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="AlignCore"></a><code>function <b>AlignCore</b>( const ThisPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const X: Integer = 0): Integer;</code></td>
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<p>
<a class="normal" href="CastleRectangles.TRectangle.html#Align">Align</a> this rectangle within other rectangle by calculating new value for <a class="normal" href="CastleRectangles.TRectangle.html#Left">Left</a>.</p>
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<td class="itemcode"><a name="Align"></a><code>function <b>Align</b>( const ThisPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#THorizontalPosition">THorizontalPosition</a>; const X: Integer = 0): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="AlignCore"></a><code>function <b>AlignCore</b>( const ThisPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const Y: Integer = 0): Integer;</code></td>
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<p>
<a class="normal" href="CastleRectangles.TRectangle.html#Align">Align</a> this rectangle within other rectangle by calculating new value for <a class="normal" href="CastleRectangles.TRectangle.html#Bottom">Bottom</a>.</p>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="Align"></a><code>function <b>Align</b>( const ThisPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const OtherRect: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; const OtherPosition: <a href="CastleRectangles.html#TVerticalPosition">TVerticalPosition</a>; const Y: Integer = 0): <a href="CastleRectangles.TRectangle.html">TRectangle</a>;</code></td>
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<td class="itemcode"><a name="ToString"></a><code>function <b>ToString</b>: string;</code></td>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><a name="Right"></a><code>property <b>Right</b>: Integer read GetRight;</code></td>
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<p>
<code>Right</code> and Top pixels are 1 pixel *outside* of the rectangle. </p>
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<td class="itemcode"><a name="Top"></a><code>property <b>Top</b>: Integer read GetTop;</code></td>
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<td class="itemcode"><a name="LeftBottom"></a><code>property <b>LeftBottom</b>: <a href="CastleVectors.html#TVector2Integer">TVector2Integer</a> read GetLeftBottom write SetLeftBottom;</code></td>
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