Getting Node Bounds in Java

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Getting Node Bounds
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The Node class provides three variables that represent the bounds of a node:
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public-read var boundsInLocal:Bounds public-read var boundsInParent:Bounds public-read var layoutBounds:Bounds
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These variables are all of type javafxgeometryBounds, which is an immutable object whose variables are listed in Table 17-62 To decide which of these three variables to use as a node s bounds, you need to know what each of the different bounds represents: The bounds in the layoutBounds variable correspond to the actual geometry of the node as seen in its own coordinate system By this, we mean the geometry of the node before any transformations,3 clip, or effect have been applied The bounds in the boundsInLocal variable are the bounds of the node as seen in its own coordinate system after any effects (see 18) and the clip have been applied, but before the application of any transforms The bounds in the boundsInParent variable are the bounds as seen in the coordinate system of the node s parent (that is, its owning scene, group, or container), after the application of all transforms Depending on the transformations that have been applied, these bounds could be very different from the node s layout or local bounds
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Bounds is an abstract class The bounds that are returned by these methods are actually instances of a concrete subclass called BoundingBox 3 Here, the term transform refers to a Transform in the transforms sequence or one specified using the transform-related variables of the Node (scaleX, scaleY, and so on)
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17 Coordinates, Transforms, and Layout
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Table 17-6 Variable
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minX
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Variables of the Bounds Class Type
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The x coordinate of the upper-left back corner of the bounded region The y coordinate of the upper-left back corner of the bounded region The z coordinate of the upper-right back corner of the bounded region The width of the bounded region The height of the bounded region The depth of the bounded region The x coordinate of the lower-right front corner of the bounded region The y coordinate of the lower-right front corner of the bounded region The z coordinate of the lower-right front corner of the bounded region
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minY
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Number
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minZ
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Number
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0x0
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width
Number
height
Number
depth
Number
maxX
Number
minX + width
maxY
Number
minY + height
maxZ
Number
minZ + depth
The layoutBounds are the bounds used by container classes when placing a node according to its layout policy, as you ll see later in this chapterWhen manually placing nodes (in a group, say), you could choose to use either the layoutBounds or the boundsInLocal, depending on whether you want to take into account the clip and effects, both of which may change the size and shape of the nodeThe simplest way to explain these different bounds is by reference to examples
Coordinates and Bounds
Bounds with No Clip, Effects, or Transforms When no transforms, clip, or effects are applied, it is easy to understand what the various bounds of a node representWe ll illustrate this by returning to the rectangle that we used for the examples in the previous section, which is defined like this and shown in Figure 17-23:
var node = Rectangle { x: 30 y: 60 width: 100 height: 40 fill: ColorYELLOW }
Figure 17-23
Bounds of a rectangle with no clip, effects, or transforms applied
To get the various bounds for this node, we use the following code:4println( Layout
bounds: {nodelayoutBounds} ); println( Local bounds: {nodeboundsInLocal} ); println( Parent bounds: {nodeboundsInParent} );
This gives the following output:
Layout bounds: BoundingBox [minX:300, minY:600, minZ:00, width:1000, height:400, depth:00, maxX:1300, maxY:1000, maxZ:00] Local bounds: BoundingBox [minX:300, minY:600, minZ:00, width:1000, height:400, depth:00, maxX:1300, maxY:1000, maxZ:00] Parent bounds: BoundingBox [minX:300, minY:600, minZ:00, width:1000, height:400, depth:00, maxX:1300, maxY:1000, maxZ:00]
Not surprisingly, the bounds are all the same the layout bounds and local bounds are the same because there is no effect or clip, and the local bounds and parent bounds are the same because there are no transforms applied
You ll find this code in the file javafxtransforms/Bounds1fx in the JavaFX Book GUI project
17 Coordinates, Transforms, and Layout
Bounds with a Clip Applied When you apply a clip/effect to a node, the boundsInLocal and boundsInParent values change to reflect their effect For example, the following code applies a clip that reduces the visible part of the yellow rectangle, as shown in Figure 17-24:
Rectangle { x: 30 y: 60 width: 100 height: 40 fill: ColorYELLOW clip: Rectangle { x: 40 y: 70 width: 20 height: 20 } }
Figure 17-24