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<DIV class=newsmallbox>Windows GDI和GDI+編程實例剖析 </DIV>
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<DIV class=newtitle1>作者： 宋寶華 </DIV>
<DIV class=newtitle2>出處： 天極網(wǎng) </DIV>
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<DIV class=newtitle4>[ 2005-11-11 08:18 ]</DIV></DIV>
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<DIV class=guanggao><SPAN 
id=contentAdv></SPAN></DIV>　　<B>5.GDI與GDI+的比較</B><BR><BR>　　GDI+相對GDI而言主要在編程方式上發(fā)生了巨大的改變。<BR><BR>　　GDI的核心是設(shè)備上下文，GDI函數(shù)都依賴于設(shè)備上下文句柄，其編程方式是基于句柄的；GDI+無需時刻依賴于句柄或設(shè)備上下文，用戶只需創(chuàng)建一個Graphics 
對象，就可以用面向?qū)ο蟮姆绞秸{(diào)用其成員函數(shù)進(jìn)行圖形操作，編程方式是基于對象的。<BR><BR>　　GDI在使用設(shè)備上下文繪制線條之前，必須先調(diào)用SelectObject 
以使鋼筆對象和設(shè)備上下文關(guān)聯(lián)。其后，在設(shè)備上下文中繪制的所有線條均使用該鋼筆，直到選擇另一支不同的鋼筆為止。CGdiexampleDlg::OnGdiDrawLine函數(shù)中的下列語句完成的就是這個功能：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>//創(chuàng)建繪制正旋曲線的pen并將其選入設(shè)備上下文<BR>CPen 
      pen(PS_SOLID,1,RGB(255,0,0));<BR>HGDIOBJ oldObject = 
      dc.SelectObject(pen.GetSafeHandle()); 
      <BR>…<BR>//創(chuàng)建繪制x軸的pen并將其選入設(shè)備上下文<BR>CPen 
      penx(PS_SOLID,1,RGB(0,0,255));<BR>dc.SelectObject(penx.GetSafeHandle());<BR>…<BR>//恢復(fù)原先的pen<BR>dc.SelectObject(oldObject);</TD></TR></TBODY></TABLE><BR>　　但是，在GDI+中，只需將Pen對象直接作為參數(shù)傳遞給Graphics類的DrawLine等方法即可，而不必使Pen對象與Graphics對象關(guān)聯(lián)，例如CGdiexampleDlg::OnGdipDrawLine函數(shù)中的下列語句：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>Pen 
      myPen(Color::Red);<BR>myPen.SetWidth(1);<BR>…<BR>graphics.DrawLine(&amp;myPen,i,100*sin(2*(i/(rect.right/5.0))*PI),<BR>i+1,100*sin(2*((i+1)/(rect.right/5.0))*PI));<BR>…<BR>graphics.DrawLine(&amp;myPen,0,0,rect.right,0);</TD></TR></TBODY></TABLE><BR>　　GDI中有當(dāng)前位置的概念，所以在使用GDI繪制線條前應(yīng)該先使用MoveTo移動當(dāng)前位置，再使用LineTo畫線，例如：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>//繪制正旋曲線<BR>dc.MoveTo(0,0) ;<BR>for(int 
      i=0;i&lt;rect.right;i++)<BR>{<BR>　dc.LineTo(i,100*sin(2*(i/(rect.right/5.0))*PI)); 
      <BR>} 
</TD></TR></TBODY></TABLE><BR>　　而GDI+中則沒有當(dāng)前位置的概念，畫線函數(shù)中可以直接指定起點和終點，例如：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>graphics.DrawLine(&amp;myPen,0,0,rect.right,0);</TD></TR></TBODY></TABLE><BR>　　<B>6.結(jié)論</B><BR><BR>　　鑒于GDI+良好的易用性和其具有的強(qiáng)大功能，我們建議盡快拋棄GDI編程方式，因為我們沒有必要將時間浪費在無意義的重復(fù)代碼的設(shè)計上。GDI+對GDI的增強(qiáng)，某種意義上類似于MFC對Windows 
API的整理和封裝。作為一種良好的"生產(chǎn)工具"，它必將大大地促進(jìn)開發(fā)時的"生產(chǎn)力"。<BR><BR>
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      <DIV align=center>編輯推薦：<A href="http://dev.yesky.com/121/2018121.shtml" 
      target=_blank><FONT 
      color=#cc3333><B>基于VC++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用</B></FONT></A></DIV></TD></TR></TBODY></TABLE>
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