📄 vc++_net的gdi+入门之位图和图标_2.htm
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class=f22><B>VC++.NET的GDI+入门之位图和图标</B></FONT></TD></TR></TBODY></TABLE></TD></TR>
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<TD colSpan=2><FONT class=f21><B>[文章信息]</B></FONT></TD></TR>
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<TD vAlign=top width=62>作者:</TD>
<TD vAlign=top width=158><FONT
color=#0e3e92>刘涛</FONT></TD></TR>
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<TD vAlign=top>时间:</TD>
<TD vAlign=top><FONT
color=#0e3e92>2005-04-19</FONT></TD></TR>
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<TD vAlign=top>出处:</TD>
<TD vAlign=top><FONT color=#0e3e92>天极网</FONT></TD></TR>
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<TD vAlign=top>责任编辑:</TD>
<TD vAlign=top><FONT color=#0e3e92>方舟</FONT></TD></TR>
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<TD colSpan=2><FONT class=f21><B>[文章导读]</B></FONT></TD></TR>
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<TD vAlign=top colSpan=2><SPAN
class=f14>位图是用于在窗体上显示图片的图形对象，它是各种场合下图形对象常用的一种类型</SPAN></TD></TR>
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<TD><SPAN
class=f14> <B>二、使用位图</B><BR><BR> 为了支持位图，GDI+提供了Bitmap类，Bitmap类是建立在抽象的Image类基础上的，如果创建了一个位图并将它存储为一个文件，可以将文件的路径传递给这个类的构造函数，如下所示：<BR><BR>
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<TD>public: Bitmap(String
*filename);</TD></TR></TBODY></TABLE><BR> 一旦已经准备好了图片，为了将它呈现给用户，可以调用Graphics::DrawImage()方法。根据所有可能的需要，这个方法重载了很多版本，其中的一个版本使用如下的语法：
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<TD>public: void DrawImage(Image *img, Point
point);</TD></TR></TBODY></TABLE><BR> 第一个参数是一个先前已经初始化了的位图对象，第二个参数规定了图片将画在什么位置，这个位置对应于图片的左上角。<BR><BR> 下面是一个例子代码：<BR><BR>
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<TD>private: System::Void Form1_Paint(System::Object * sender,
<BR>System::Windows::Forms::PaintEventArgs * e)<BR>{<BR>Bitmap
*bmpFood = new
Bitmap(S"FoodBasket.bmp");<BR>e->Graphics->DrawImage(bmpFood,
0, 0);<BR>}</TD></TR></TBODY></TABLE><BR>
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<DIV align=center><IMG
onerror="this.src='http://www.yesky.com/image20010518/284552.gif';"
hspace=3 src="VC++_NET的GDI+入门之位图和图标_2.files/284552.gif"
align=center vspace=1
border=1><BR>图八、例子代码显示的图片</DIV></TD></TR></TBODY></TABLE><BR> 实例：显示一个位图<BR><BR> 1、点击窗体的空白区域，确定已经选择了该窗体，在属性窗口中选择事件按钮；
<BR><BR> 2、为了显示图片，双击重画区域，并输入以下代码：<BR><BR>
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<TD>private: System::Void Form1_Paint(System::Object * sender,
<BR>System::Windows::Forms::PaintEventArgs * e)<BR>{<BR>Bitmap
*butterfly = new
Bitmap(S"Butterfly.bmp");<BR>e->Graphics->DrawImage(butterfly,
10, 10);<BR>}</TD></TR></TBODY></TABLE><BR> 3、执行上述代码进行测试，。<BR><BR>
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<DIV align=center><IMG
onerror="this.src='http://www.yesky.com/image20010518/284555.gif';"
hspace=3 src="VC++_NET的GDI+入门之位图和图标_2.files/284555.gif"
align=center vspace=1
border=1><BR>图九、代码测试效果图</DIV></TD></TR></TBODY></TABLE><BR> 4、关闭窗体返回开发环境。<BR><BR></SPAN><BR></TD></TR></TBODY></TABLE></TD></TR>
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