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<h1 ALIGN="center">- I -</h1>
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<p ALIGN="left"><a NAME="inflaterect"></a></p>
<h3 ALIGN="center">InflateRect Function</h3>
<code>
<p align="center">Declare Function InflateRect Lib "user32.dll" (lpRect As <a
HREF="appa.html#rect">RECT</a>, ByVal x As Long, ByVal y As Long) As Long</code><br>
InflateRect increases or decreases the size of a rectangle. The values to inflate the
rectangle by are added on both sides of it, so in reality the width or height increases
double what you pass to it. For example, if you give it 20 as the x parameter, it will
extend the left and right side by 20, so the end result is 40 wider. Positive values make
the rectangle larger, and negative ones make it smaller. Mathematically, when you call the
function, <code>x</code> is added to .Right and subtracted from .Left, and <code>y</code>
is added to .Bottom and subtracted from .Top. You can safely ignore the value returned.<br>
</p>
<table WIDTH="95%" BORDER="2" CELLSPACING="0">
<tr>
<td WIDTH="20%"><code>lpRect</code></td>
<td WIDTH="80%">The rectangle to make bigger or smaller (or both). </td>
</tr>
<tr>
<td><code>x</code></td>
<td>The number of pixels to expand the left and right sides by. Positive values increase
the width, negative values decrease it. </td>
</tr>
<tr>
<td><code>y</code></td>
<td>The number of pixels to expand the top and bottom by. Positive values increase the
height, negative values decrease it. </td>
</tr>
</table>
<b>
<p>Example:</b><br>
<code> 'Expand a rectangle by 30 on left and right and -10 on top and bottom<br>
Dim r As RECT<br>
x = SetRect(r, 50, 50, 100, 100) 'API function that sets rectangle size<br>
'.Left = 50, .Top = 50, .Right = 100, .Bottom = 100<br>
x = InflateRect(r, 30, -10)<br>
'Now, .Left = 20, .Top = 60, .Right = 130, .Bottom = 90</code><br>
<br>
<b>Related Call:</b> <a HREF="o.html#offsetrect">OffsetRect</a><br>
<b>Category:</b> <a HREF="index.html#rectmanipulation" REL="Index">RECT Manipulation</a><br>
<a HREF="index.html" REL="Index">返回到索引.</a> </p>
<hr ALIGN="center" WIDTH="85%" SIZE="5">
<p ALIGN="left"><a NAME="intersectrect"></a></p>
<h3 ALIGN="center">IntersectRect Function</h3>
<code>
<p align="center">Declare Function IntersectRect Lib "user32.dll" (lpDestRect As
<a HREF="appa.html#rect">RECT</a>, lpSrc1Rect As <a HREF="appa.html#rect">RECT</a>,
lpSrc2Rect As <a HREF="appa.html#rect">RECT</a>) As Long</code><br>
IntersectRect creates a rectangle based on the intersecting parts of two other rectangles.
The box-shaped region where the two source rectangles overlap is the intersection
rectangle. If one or both of the source rectangles are empty (see IsRectEmpty for
definition of an empty rectangle) or they no not overlap anywhere, the function returns 0
and the destination rectangle is set as all 0's. If the source rectangles do overlap, the
function returns 1.<br>
</p>
<table WIDTH="95%" BORDER="2" CELLSPACING="0">
<tr>
<td WIDTH="20%"><code>lpDestRect</code></td>
<td WIDTH="80%">The rectangle to set as the intersection of the two source rectangles. </td>
</tr>
<tr>
<td><code>lpSrc1Rect</code></td>
<td>The first source rectangle. </td>
</tr>
<tr>
<td><code>lpSrc2Rect</code></td>
<td>The second source rectangle. </td>
</tr>
</table>
<b>
<p>Example:</b><br>
<code> 'Demonstration of IntersectRect<br>
Dim target As RECT, s1 As RECT, s2 As RECT<br>
x = SetRect(s1, 50, 50, 150, 150) 'API function sets rectangle at
(50,50)-(150,150)<br>
x = SetRect(s2, 100, 100, 200, 200) '(100,100)-(200,200)<br>
x = IntersectRect(target, s1, s2)<br>
'target.Left = 100, .Top = 100, .Right = 150, .Bottom = 150</code><br>
<br>
<b>Related Calls:</b> <a HREF="s.html#subtractrect">SubtractRect</a>, <a
HREF="u.html#unionrect">UnionRect</a><br>
<b>Category:</b> <a HREF="index.html#rectmanipulation" REL="Index">RECT Manipulation</a><br>
<a HREF="index.html" REL="Index">返回到索引.</a> </p>
<hr ALIGN="center" WIDTH="85%" SIZE="5">
<p ALIGN="left"><a NAME="isrectempty"></a></p>
<h3 ALIGN="center">IsRectEmpty Function</h3>
<code>
<p align="center">Declare Function IsRectEmpty Lib "user32.dll" (lpRect As <a
HREF="appa.html#rect">RECT</a>) As Long</code><br>
IsRectEmpty checks to see if a RECT-type variable contains an empty rectangle. A rectangle
is considered empty if and only if its .Right is not to the right of .Left and/or its
.Bottom is not below the .Top. In other words, a rectangle is empty if and only if .Right
<= .Left and/or .Bottom <= .Top. The function returns 1 if the rectangle is empty,
and 0 if it is not.<br>
</p>
<table WIDTH="95%" BORDER="2" CELLSPACING="0">
<tr>
<td WIDTH="20%"><code>lpRect</code></td>
<td WIDTH="80%">The rectangle to check to see if it is empty. </td>
</tr>
</table>
<b>
<p>Example:</b><br>
<code> 'Demonstration of what is considered empty<br>
Dim r As RECT<br>
x = SetRect(50, 50, 40, 100) '.Right < .Left<br>
Form1.Print IsRectEmpty(r) 'Returns 1<br>
x = SetRect(50, 50, 100, 100) '.Left < .Right and .Top < .Bottom<br>
Form1.Print IsRectEmpty(r) 'Returns 0<br>
x = SetRect(50, 50, 100, 50) '.Top = .Bottom<br>
Form1.Print IsRectEmpty(r) 'Returns 1</code><br>
<br>
<b>Related Call:</b> <a HREF="s.html#setrectempty">SetRectEmpty</a><br>
<b>Category:</b> <a HREF="index.html#rectmanipulation" REL="Index">RECT Manipulation</a><br>
<a HREF="index.html" REL="Index">返回到索引.</a> </p>
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