layer.html

是MIDP 的API 查詢文件, 大家可以看一下裡面的index.html, 再用Package 或 Class 名字來查.

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<B>Method Detail</B></FONT></TD>
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<A NAME="setPosition(int, int)"><!-- --></A><H3>
setPosition</H3>
<PRE>
public void <B>setPosition</B>(int&nbsp;x,
                        int&nbsp;y)</PRE>
<DL>
<DD>Sets this Layer's position such that its upper-left corner
 is located at (x,y) in the painter's coordinate system. 
 A Layer is located at (0,0) by default.
 <br><DD><DL>
<DT><B>Parameters:</B><DD><CODE>x</CODE> - the horizontal position<DD><CODE>y</CODE> - the vertical position<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#move(int, int)"><CODE>move(int, int)</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getX()"><CODE>getX()</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getY()"><CODE>getY()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="move(int, int)"><!-- --></A><H3>
move</H3>
<PRE>
public void <B>move</B>(int&nbsp;dx,
                 int&nbsp;dy)</PRE>
<DL>
<DD>Moves this Layer by the specified horizontal and vertical distances.  
 <br>
 The Layer's coordinates are subject to wrapping if the passed 
 parameters will cause them to exceed beyond Integer.MAX_VALUE 
 or Integer.MIN_VALUE.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dx</CODE> - the distance to move along horizontal axis (positive
 to the right, negative to the left)<DD><CODE>dy</CODE> - the distance to move along vertical axis (positive
 down, negative up)<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#setPosition(int, int)"><CODE>setPosition(int, int)</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getX()"><CODE>getX()</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getY()"><CODE>getY()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getX()"><!-- --></A><H3>
getX</H3>
<PRE>
public final int <B>getX</B>()</PRE>
<DL>
<DD>Gets the horizontal position of this Layer's upper-left corner
 in the painter's coordinate system.
 <p><DD><DL>
<DT><B>Returns:</B><DD>the Layer's horizontal position.<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getY()"><CODE>getY()</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#setPosition(int, int)"><CODE>setPosition(int, int)</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#move(int, int)"><CODE>move(int, int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getY()"><!-- --></A><H3>
getY</H3>
<PRE>
public final int <B>getY</B>()</PRE>
<DL>
<DD>Gets the vertical position of this Layer's upper-left corner
 in the painter's coordinate system.
 <p><DD><DL>
<DT><B>Returns:</B><DD>the Layer's vertical position.<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getX()"><CODE>getX()</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#setPosition(int, int)"><CODE>setPosition(int, int)</CODE></A>, 
<A HREF="../../../../javax/microedition/lcdui/game/Layer.html#move(int, int)"><CODE>move(int, int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getWidth()"><!-- --></A><H3>
getWidth</H3>
<PRE>
public final int <B>getWidth</B>()</PRE>
<DL>
<DD>Gets the current width of this layer, in pixels.<DD><DL>
<DT><B>Returns:</B><DD>the width in pixels<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getHeight()"><CODE>getHeight()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getHeight()"><!-- --></A><H3>
getHeight</H3>
<PRE>
public final int <B>getHeight</B>()</PRE>
<DL>
<DD>Gets the current height of this layer, in pixels.<DD><DL>
<DT><B>Returns:</B><DD>the height in pixels<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#getWidth()"><CODE>getWidth()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setVisible(boolean)"><!-- --></A><H3>
setVisible</H3>
<PRE>
public void <B>setVisible</B>(boolean&nbsp;visible)</PRE>
<DL>
<DD>Sets the visibility of this Layer.  A visible Layer is rendered when
 its <A HREF="../../../../javax/microedition/lcdui/game/Layer.html#paint(javax.microedition.lcdui.Graphics)"><CODE>paint(Graphics)</CODE></A> method is called; an invisible Layer is
 not rendered.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>visible</CODE> - <code>true</code> to make the <code>Layer</code> visible, 
 <code>false</code> to make it invisible<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#isVisible()"><CODE>isVisible()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="isVisible()"><!-- --></A><H3>
isVisible</H3>
<PRE>
public final boolean <B>isVisible</B>()</PRE>
<DL>
<DD>Gets the visibility of this Layer.<DD><DL>
<DT><B>Returns:</B><DD><code>true</code> if the <code>Layer</code> is visible,
 <code>false</code> if it is invisible.<DT><B>See Also: </B><DD><A HREF="../../../../javax/microedition/lcdui/game/Layer.html#setVisible(boolean)"><CODE>setVisible(boolean)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="paint(javax.microedition.lcdui.Graphics)"><!-- --></A><H3>
paint</H3>
<PRE>
public abstract void <B>paint</B>(<A HREF="../../../../javax/microedition/lcdui/Graphics.html">Graphics</A>&nbsp;g)</PRE>
<DL>
<DD>Paints this Layer if it is visible.  The upper-left corner of the Layer
 is rendered at it's current (x,y) position relative to the origin of
 the provided Graphics object.  Applications may make use of Graphics
 clipping and translation to control where the Layer is rendered and to
 limit the region that is rendered.
 <P>
 Implementations of this method are responsible for checking if this
 Layer is visible; this method does nothing if the Layer is not
 visible.
 <p>
 The attributes of the Graphics object (clip region, translation, 
 drawing color, etc.) are not modified as a result of calling this
 method.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>g</CODE> - the graphics object for rendering the <code>Layer</code><DT><B>Throws:</B><DD><CODE><A HREF="../../../../java/lang/NullPointerException.html">NullPointerException</A></CODE> - if <code>g</code> is <code>null</code></DL>
</DD>
</DL>
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