group__clip__fns.htm

MINIGUI1.6开发API

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          <td class="md" nowrap valign="top"><a class="el" href="group__simple__types.htm#ga0">BOOL</a> GUIAPI PtVisible           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__handles.htm#ga2">HDC</a>&nbsp;</td>
          <td class="mdname" nowrap> <em>hdc</em>, </td>
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          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>x</em>, </td>
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          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>y</em></td>
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          <td class="md">)&nbsp;</td>
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<p>
Checks whether a point is visible. 
<p>
This function checks whether the point specified by <em></em>(x,y) is visible, i.e. it is within the current visible clipping region of the device context <em>hdc</em>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>hdc</em>&nbsp;</td><td>The device context. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>x</em>&nbsp;</td><td>x,y: The coordinates of the point. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>y</em>&nbsp;</td><td>x,y: The coordinates of the point. </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>TRUE for visible, else for not.</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__clip__fns.htm#ga7">RectVisible</a>, <a class="el" href="group__region__fns.htm">Region operations</a> </dd></dl>
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<a class="anchor" name="ga7" doxytag="gdi.h::RectVisible"></a><p>
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          <td class="md" nowrap valign="top"><a class="el" href="group__simple__types.htm#ga0">BOOL</a> GUIAPI RectVisible           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__handles.htm#ga2">HDC</a>&nbsp;</td>
          <td class="mdname" nowrap> <em>hdc</em>, </td>
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          <td class="md" nowrap>const <a class="el" href="struct__RECT.htm">RECT</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>pRect</em></td>
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          <td class="md"></td>
          <td class="md">)&nbsp;</td>
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<p>
Checks whether the specified rectangle is visible. 
<p>
This function checks whether the rectangle pointed to by <em>pRect</em> is visible, i.e. it is intersected with the current visible region of the device context <em>hdc</em>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>hdc</em>&nbsp;</td><td>The device context. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pRect</em>&nbsp;</td><td>Pointer to the rectangle.</td></tr>
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<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__clip__fns.htm#ga2">PtVisible</a>, <a class="el" href="group__region__fns.htm">Region operations</a></dd></dl>
Example:<p>
<div class="fragment"><pre class="fragment"><span class="comment">/*</span>
<span class="comment"> * Use RectVisible to optimize the repaint of the window.</span>
<span class="comment"> */</span>
<a class="code" href="group__paint__msgs.htm#ga3">MSG_PAINT</a>:
{
        <a class="code" href="group__handles.htm#ga2">HDC</a> hdc = <a class="code" href="group__window__general__fns.htm#ga30">BeginPaint</a> (hWnd);

        <span class="keywordflow">for</span> (j = 0; j &lt; 10; j ++) {
                <span class="keywordflow">if</span> (<a class="code" href="group__clip__fns.htm#ga7">RectVisible</a>  (hdc, rcs + j)) {
                        <a class="code" href="group__draw__fns.htm#ga40">FillBox</a> (hdc, rcs[j].left, rcs[j].top, rcs [j].right, rcs [j].bottom);
                }
        }

        <a class="code" href="group__window__general__fns.htm#ga31">EndPaint</a> (hWnd, hdc);
        <span class="keywordflow">return</span> 0;
}
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<a class="anchor" name="ga4" doxytag="gdi.h::SelectClipRect"></a><p>
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          <td class="md" nowrap valign="top">void GUIAPI SelectClipRect           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__handles.htm#ga2">HDC</a>&nbsp;</td>
          <td class="mdname" nowrap> <em>hdc</em>, </td>
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          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>const <a class="el" href="struct__RECT.htm">RECT</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>prc</em></td>
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          <td class="md"></td>
          <td class="md">)&nbsp;</td>
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<p>
Sets the visible region of a DC to be a rectangle. 
<p>
This function sets the visible region of the device context <em>hdc</em> to the rectangle pointed to by <em>prc</em>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>hdc</em>&nbsp;</td><td>The device context. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>prc</em>&nbsp;</td><td>Pointer to the rectangle.</td></tr>
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</dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__clip__fns.htm#ga5">SelectClipRegion</a>, <a class="el" href="group__region__fns.htm">Region operations</a> </dd></dl>
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<a class="anchor" name="ga5" doxytag="gdi.h::SelectClipRegion"></a><p>
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          <td class="md" nowrap valign="top">void GUIAPI SelectClipRegion           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__handles.htm#ga2">HDC</a>&nbsp;</td>
          <td class="mdname" nowrap> <em>hdc</em>, </td>
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          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>const <a class="el" href="struct__CLIPRGN.htm">CLIPRGN</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>pRgn</em></td>
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          <td class="md">)&nbsp;</td>
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<p>
Sets the visible region of a DC to be a region. 
<p>
This function sets the visible region of the device context <em>hdc</em> to the region pointed to by <em>pRgn</em>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>hdc</em>&nbsp;</td><td>The device context. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pRgn</em>&nbsp;</td><td>Pointer to the region.</td></tr>
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</dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__clip__fns.htm#ga4">SelectClipRect</a>, <a class="el" href="group__region__fns.htm">Region operations</a> </dd></dl>
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