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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 </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生了巨大的改變。<BR><BR> GDI的核心是設備上下文,GDI函數都依賴于設備上下文句柄,其編程方式是基于句柄的;GDI+無需時刻依賴于句柄或設備上下文,用戶只需創建一個Graphics
對象,就可以用面向對象的方式調用其成員函數進行圖形操作,編程方式是基于對象的。<BR><BR> GDI在使用設備上下文繪制線條之前,必須先調用SelectObject
以使鋼筆對象和設備上下文關聯。其后,在設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>
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<TR>
<TD>//創建繪制正旋曲線的pen并將其選入設備上下文<BR>CPen
pen(PS_SOLID,1,RGB(255,0,0));<BR>HGDIOBJ oldObject =
dc.SelectObject(pen.GetSafeHandle());
<BR>…<BR>//創建繪制x軸的pen并將其選入設備上下文<BR>CPen
penx(PS_SOLID,1,RGB(0,0,255));<BR>dc.SelectObject(penx.GetSafeHandle());<BR>…<BR>//恢復原先的pen<BR>dc.SelectObject(oldObject);</TD></TR></TBODY></TABLE><BR> 但是,在GDI+中,只需將Pen對象直接作為參數傳遞給Graphics類的DrawLine等方法即可,而不必使Pen對象與Graphics對象關聯,例如CGdiexampleDlg::OnGdipDrawLine函數中的下列語句:<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(&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(&myPen,0,0,rect.right,0);</TD></TR></TBODY></TABLE><BR> GDI中有當前位置的概念,所以在使用GDI繪制線條前應該先使用MoveTo移動當前位置,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<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+中則沒有當前位置的概念,畫線函數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(&myPen,0,0,rect.right,0);</TD></TR></TBODY></TABLE><BR> <B>6.結論</B><BR><BR> 鑒于GDI+良好的易用性和其具有的強大功能,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代碼的設計上。GDI+對GDI的增強,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"生產工具",它必將大大地促進開發時的"生產力"。<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常用坐標系統及應用</B></FONT></A></DIV></TD></TR></TBODY></TABLE>
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