m.html

来自「windowsAPI介绍。很详细的」· HTML 代码 · 共 81 行

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<title>Windows 95 API Dictionary: M</title>
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<h1 ALIGN="center">- M -</h1>

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<p ALIGN="left"><a NAME="movetoex"></a></p>

<h3 ALIGN="center">MoveToEx Function</h3>
<code>

<p align="center">Declare Function MoveToEx Lib &quot;gdi32.dll&quot; (ByVal hdc As Long, 
ByVal x As Long, ByVal y As Long, lpPoint As <a HREF="appa.html#pointapi">POINTAPI</a>) As 
Long</code><br>
MoveToEx sets the current point of a graphical object. The current point is the starting 
point from which graphics API calls ending with &quot;To&quot; begin drawing from. This is 
the same general idea as being able to omit the first (x,y) pair in VB's Line method -- it 
draws from the last point referenced. Also, any graphics API functions ending with 
&quot;To&quot; almost always set the current point of the object to the last point drawn 
to. MoveToEx also returns the former current point in <code>lpPoint</code>. You can safely 
ignore the value returned.<br>
</p>

<table WIDTH="95%" BORDER="2" CELLSPACING="0">
  <tr>
    <td WIDTH="20%"><code>hdc</code></td>
    <td WIDTH="80%">The device context of the control to reference. </td>
  </tr>
  <tr>
    <td><code>x</code></td>
    <td>The x coordinate of the point to set as the current point. </td>
  </tr>
  <tr>
    <td><code>y</code></td>
    <td>The y coordinate of the point to set as the current point. </td>
  </tr>
  <tr>
    <td><code>lpPoint</code></td>
    <td>Receives the coordinate of the former current point. </td>
  </tr>
</table>
<b>

<p>Example:</b><br>
<code>&nbsp;&nbsp;'Draw a line from (0,0) to (100,100) in Form1<br>
&nbsp;&nbsp;'The LineTo function starts from the current point, so we have to first<br>
&nbsp;&nbsp;'set the current point to (0,0). Notice how lpPoint can be ignored.<br>
&nbsp;&nbsp;Dim old As POINTAPI<br>
&nbsp;&nbsp;x = MoveToEx(Form1.hDC, 0, 0, old) 'set current point<br>
&nbsp;&nbsp;x = LineTo(Form1.hDC, 100, 100) 'draws from (0,0)</code><br>
<br>
<b>Category:</b> <a HREF="index.html#graphics" REL="Index">Graphics</a><br>
<a HREF="#top">返回到索引</a><a HREF="index.html" REL="Index">.</a> </p>

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