android.graphics.Rect类的详解

今天药忘吃喽~ 2022-08-26 00:57 217阅读 0赞

public final class

# Rect #

extends Object  
implements Parcelable

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   <td colspan="2" style="margin:0px; padding:0px; border:none; vertical-align:top; background-color:inherit"> <a style="color:rgb(0,102,153)" rel="nofollow">java.lang.Object</a></td> 
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   <td style="margin:0px; padding:0px; border:none; vertical-align:top; background-color:inherit; font-weight:bold; width:1em"> &nbsp;&nbsp;&nbsp;↳</td> 
   <td colspan="1" style="margin:0px; padding:0px; border:none; vertical-align:top; background-color:inherit"> android.graphics.Rect</td> 
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   <th colspan="12" style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:rgb(222,232,241)"> Public Methods</th> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> final int </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">centerX</a></span>()获取矩阵中心点（x，y） </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> final int </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">centerY</a></span>() </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">contains</a></span>(int x, int y)是否包含（x,y）点 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Returns true if (x,y) is inside the rectangle. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">contains</a></span>(int left, int top, int right, int bottom)是否包含（ <span style="white-space:nowrap">int left, int top, int right, int bottom</span>）矩阵 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Returns true iff the 4 specified sides of a rectangle are inside or equal to this rectangle. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">contains</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;r) 
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      Returns true iff the specified rectangle r is inside or equal to this rectangle. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> int </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">describeContents</a></span>() 
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      Parcelable interface methods 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">equals</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Object</a>&nbsp;obj) 
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      Compares this instance with the specified object and indicates if they are equal. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> final float </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">exactCenterX</a></span>()该方法和CenterX()类似，只是该方法精确度比它高（返回float类型） </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> final float </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">exactCenterY</a></span>() </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">String</a> </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">flattenToString</a></span>() 
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      Return a string representation of the rectangle in a well-defined format. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> final int </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">height</a></span>() </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">inset</a></span>(int dx, int dy) 
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      Inset the rectangle by (dx,dy). 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">intersect</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;r) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      If the specified rectangle intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">intersect</a></span>(int left, int top, int right, int bottom) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      If the rectangle specified by left,top,right,bottom intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">intersects</a></span>(int left, int top, int right, int bottom) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Returns true if this rectangle intersects the specified rectangle. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> static boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">intersects</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;a,&nbsp; <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;b) 
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      Returns true iff the two specified rectangles intersect. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> final boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">isEmpty</a></span>() 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Returns true if the rectangle is empty (left &gt;= right or top &gt;= bottom) 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="color:#ff0000"><span style="margin-right:2px"><a style="text-decoration:none" rel="nofollow">offset</a></span>(int dx, int dy)该矩阵在x轴和y轴分别发生的偏移量（很有用，可以上下移动矩阵）</span> 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Offset the rectangle by adding dx to its left and right coordinates, and adding dy to its top and bottom coordinates. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">offsetTo</a></span>(int newLeft, int newTop)保持矩阵的宽高，矩阵的左上角偏移到（newLeft,newTop）该点 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Offset the rectangle to a specific (left, top) position, keeping its width and height the same. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">readFromParcel</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Parcel</a>&nbsp;in) 
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      Set the rectangle's coordinates from the data stored in the specified parcel. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">set</a></span>(int left, int top, int right, int bottom) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Set the rectangle's coordinates to the specified values. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">set</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;src) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Copy the coordinates from src into this rectangle. 
    </div> </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">setEmpty</a></span>() 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Set the rectangle to (0,0,0,0) 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> boolean </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">setIntersect</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;a,&nbsp; <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;b) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      If rectangles a and b intersect, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">sort</a></span>() 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Swap top/bottom or left/right if there are flipped (i.e. 
    </div> </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">String</a> </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">toShortString</a></span>() 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Return a string representation of the rectangle in a compact form. 
    </div> </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">String</a> </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">toString</a></span>() 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Returns a string containing a concise, human-readable description of this object. 
    </div> </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> static&nbsp; <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a> </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">unflattenFromString</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">String</a>&nbsp;str) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Returns a Rect from a string of the form returned by&nbsp; 
     <code style="color:rgb(0,112,0); line-height:1em"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">flattenToString()</a></code>, or null if the string is not of that form. 
    </div> </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">union</a></span>(int left, int top, int right, int bottom) 
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      Update this Rect to enclose itself and the specified rectangle. 
    </div> </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">union</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Rect</a>&nbsp;r) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Update this Rect to enclose itself and the specified rectangle. 
    </div> </td> 
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   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">union</a></span>(int x, int y) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Update this Rect to enclose itself and the [x,y] coordinate. 
    </div> </td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px"> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> final int </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">width</a></span>() </td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; background-color:rgb(246,246,246)"> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); text-align:right; vertical-align:top; background-color:inherit"> void </td> 
   <td style="margin:0px; padding:6px 12px; border:1px solid rgb(204,204,204); vertical-align:top; background-color:inherit"> <span style="margin-right:2px"><a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">writeToParcel</a></span>( <a style="color:rgb(0,102,153); text-decoration:none" rel="nofollow">Parcel</a>&nbsp;out, int flags) 
    <div style="margin:0px; padding:3px 1em 0px; border:0px">
      Write this rectangle to the specified parcel. 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

1. **new** Rect(150, 75, 260, 120)

这个构造方法需要四个参数这四个参数指明了什么位置？我们就来解释怎么画这个矩形  
这四个参数分别代表的意思是：left top right bottom 上下左右呗。啊，不是是左上右下。下面给大家解释  
left ：矩形左边的X坐标 150   
top: 矩形顶部的Y坐标 75   
right : 矩形右边的X坐标 260   
bottom：矩形底部的Y坐标 120

**说白了就是左上角的坐标是（150,75），右下角的坐标是（260,120），这样就好理解了**

![SouthEast][]

2、Rect类与RectF类（android.graphics.RectF）的区别??

答：主要还是在精度上的不同，他们分别是：int、float类型的

[SouthEast]: /images/20220824/fc2d53f292684c9eb6442b4fdc3ecae7.png