?? 基于vc_net的gdi+編程入門之畫刷 _1.htm
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<DT>基于VC.NET的GDI+編程入門之畫刷
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作者:劉濤 2005-12-03 來源:天極網(wǎng) 瀏覽:<SPAN id=count></SPAN> </DIV>
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<DD class=ArticleInfo_3><A
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<DD
class=ArticleContent> 基于線條的、封閉的圖形需要畫筆來表現(xiàn)，封閉的形狀的典型的特點在于它可以用圖形、顏色或模式來填充。<BR><BR>
<TABLE style="MARGIN: 10px 8px 3px 7px" cellSpacing=0 cellPadding=0 align=left
border=0>
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<TR>
<TD><SPAN
id=ad_qqread_mid_big></SPAN></TD></TR></TBODY></TABLE> 畫刷是具有顏色，圖形或模式的對象，它用來填充圖形內(nèi)部，這種定義也意味著根據(jù)不同的目的有不同的畫刷。為了滿足這一目標(biāo)，.NET框架在不同的名字空間中使用不同的類來支持畫刷。所有畫刷的基類是Brush類，它定義在System::Drawing名字空間中。<BR><BR> <B>一、使用畫刷</B><BR><BR> 因為畫刷的主要工作是填充封閉的圖形，Graphics類為每一中圖形都提供了一個填充方法。這些方法是：<BR><BR> ·FillRectangle:
填充一個矩形或一個正方形； <BR> ·FillRectangle: 填充一系列的矩形； <BR> ·FillEllipse: 填充橢圓或圓
<BR> ·FillPolygon: 填充多邊形<BR> ·FillPie:
填充餅圖<BR> ·FillPath:填充圖形路徑<BR><BR> 為了填寫一個圖形，調(diào)用上述的一個方法，給它傳遞一個刷子值，然后是圖形的位置和尺寸，例如，如果想繪制一個矩形并用一個畫刷來填充它，可以使用與下面相似的代碼：<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#dadacf
border=1><TBODY>
<TR>
<TD>private: System::Void Form1_Paint(System::Object *
sender,PaintEventArgs *
e)<BR>{<BR>e->Graphics->FillRectangle(SomeBrush, 20, 20, 200,
160);<BR>}</TD></TR></TBODY></TABLE><BR> 總共有四種畫刷。<BR><BR> （一）實心畫刷<BR><BR> 最簡單的畫刷就是實心的，這種畫刷只提供了一種顏色，習(xí)慣于用它來填充一個區(qū)域。為了獲得實心畫刷，可以使用System.Drawing
名字空間中的SolidBrush類。它只有一個構(gòu)造函數(shù)，語法如下：<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#dadacf
border=1><TBODY>
<TR>
<TD>public: SolidBrush(Color
color);</TD></TR></TBODY></TABLE><BR> color參數(shù)必須是有效定義的顏色值，這里是一個例子：<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#dadacf
border=1><TBODY>
<TR>
<TD>private: System::Void Form1_Paint(System::Object * sender,
<BR>System::Windows::Forms::PaintEventArgs * e)<BR>{<BR>SolidBrush
*brushBlue = new
SolidBrush(Color::Blue);<BR>e->Graphics->FillRectangle(brushBlue,
20, 20, 200, 160);<BR>}</TD></TR></TBODY></TABLE><BR>
<TABLE width="90%" align=center border=0>
<TBODY>
<TR>
<TD>
<DIV align=center><IMG hspace=3
src="基于VC_NET的GDI+編程入門之畫刷 _1.files/20051203ig390_1.gif" align=center
vspace=1 border=1
;?><BR>圖一、代碼運(yùn)行效果圖</DIV></TD></TR></TBODY></TABLE><BR> 如果想用不同的顏色填充不同的圖形，不必為每一個圖形創(chuàng)建一個新的畫刷，任何時候，在對一個已經(jīng)定義的畫刷進(jìn)行重用之前，只需要簡單地更改顏色，正式基于這個原因，SolidBrush類提供了顏色屬性，例子代碼如下：<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#dadacf
border=1><TBODY>
<TR>
<TD>private: System::Void Form1_Paint(System::Object * sender,
<BR>System::Windows::Forms::PaintEventArgs * e)<BR>{<BR>SolidBrush
*colorizer = new
SolidBrush(Color::Lime);<BR>e->Graphics->FillRectangle(colorizer,
10, 10, 120, 120); <BR>colorizer->Color =
Color::Salmon;<BR>e->Graphics->FillRectangle(colorizer, 140, 10,
120, 120);<BR><BR>colorizer->Color =
Color::Aqua;<BR>e->Graphics->FillRectangle(colorizer, 10, 140,
120, 120);<BR><BR>colorizer->Color =
Color::Navy;<BR>e->Graphics->FillRectangle(colorizer, 140, 140,
120, 120);<BR>}</TD></TR></TBODY></TABLE><BR>
<TABLE width="90%" align=center border=0>
<TBODY>
<TR>
<TD>
<DIV align=center><IMG hspace=3
src="基于VC_NET的GDI+編程入門之畫刷 _1.files/20051203ig390_2.gif" align=center
vspace=1 border=1
;?><BR>圖二、代碼運(yùn)行效果圖</DIV></TD></TR></TBODY></TABLE><BR> 與在圖形編程中使用的絕大部分對象一樣，畫刷消耗計算機(jī)的資源，所以，使用過它以后，需要調(diào)用
Dispose()方法來釋放它使用的資源。例子代碼如下：<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#dadacf
border=1><TBODY>
<TR>
<TD>private: System::Void Form1_Paint(System::Object * sender,
<BR>System::Windows::Forms::PaintEventArgs * e)<BR>{<BR>SolidBrush
*colorizer = new
SolidBrush(Color::Lime);<BR>e->Graphics->FillRectangle(colorizer,
10, 10, 120, 120);<BR><BR>colorizer->Color =
Color::Salmon;<BR>e->Graphics->FillRectangle(colorizer, 140, 10,
120, 120);<BR><BR>colorizer->Color =
Color::Aqua;<BR>e->Graphics->FillRectangle(colorizer, 10, 140,
120, 120);<BR><BR>colorizer->Color =
Color::Navy;<BR>e->Graphics->FillRectangle(colorizer, 140, 140,
120, 120);<BR><BR>colorizer.Dispose();<BR>}</TD></TR></TBODY></TABLE><BR>
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