Illustrating the ClipView class in Java

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Illustrating the ClipView class
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As you can see the ClipView acts as a window on the image Because panning is enabled by default, when the mouse is moved over the ClipView, the cursor is changed to indicate that the user can drag the underlying node so that a different part of it is visible10 You can see the result of dragging the image on the right of Figure 17-54The panning effect is achieved by adjusting the values of the clipX and clipY variables by the amount by which the mouse is draggedWhen the pannable variable is true, this is done automatically by the ClipView classApplication code can also change the position of the ClipView window by modifying these variablesThis works whatever the value of the pannable variable is The maxClipX and maxClipY variables always contain the maximum legal values for clipX and clipY, respectively If an attempt is made to set clipX to a negative value, it is
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The cursor might not change on mobile devices; refer to the discussion of cursors in 15, Node Variables and Events
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forced to 0, and similarly if the value assigned to clipX is greater than maxClipX, it is forced to be maxClipX Similar checks are applied to clipY Because this happens automatically, application code does not usually need to be concerned about the actual values of maxClipX and maxClipY when setting the clipX or clipY variables In the example in Listing 17-7, the width of the ClipView is 180 pixels, and the width of the image being displayed is 500 pixels, so the value of maxClipX will be (500 180) or 320This value ensures that the user (or application code) can move the image until its right side is at the right edge of the ClipView, but no further If the stage is widened, the width of the ClipView will also increase, and maxClipX will decrease by the same amount
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Centering Nodes
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One of the things you will probably need to do quite frequently is to place one node so that it is centered over another and then remains centered over it even when the other node is moved or resizedYou can see a typical example of this in Figure 17-55, which shows a text node object that is centered on a rectangle Placing the text object properly is a matter of determining the appropriate values for its layoutX and layoutY values because, as you already know, layout is conventionally performed by setting these variables
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Figure 17-55
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Centering a node over another node
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With regard to the annotations in Figure 17-55, the problem is to determine the distance shown as layoutX valueThe problem of calculating the correct value for layoutY is similar, so we don t discuss that here It should be clear from the diagram that the correct value for layoutX can be obtained by adding to the x position of the rectangle (shown as srcX) the value of the expression (srcWidth - targetWidth)/2 So, how do we get these values As you have already seen, several functions would return the bounds of the rectangle, from which we can get the values for srcX and srcWidthWhich of these bounds should we use It is not appropriate to use the local bounds because that does not take into account any transformation that might be applied to the rectangle Nor should we use the scene bounds because, in the general case, the nodes in question might be parented by a group nested within the scene, not by the scene itselfThe correct bounds to use are the parent bounds because these represent what you see on the screen
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17 Coordinates, Transforms, and Layout
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What about getting the bounds of the text object, from which we can obtain One possible answer is to use the parent bounds againThis approach would work, but convention dictates that we use the node s layout bounds instead As you have already seen, the layout bounds, which can be obtained from the layoutBounds variable, are the bounds that a node has before any of the clips, effects, or transforms in its transforms variable or those implied by its scaleX, scaleY, translateX, translateY, translateZ, and rotate variables have been applied If it seems strange to you that we choose to use the bounds before transformations have been applied (as do all the standard container classes), the reason is that if you use the layout bounds to determine where to place the node, you can then apply transforms to scale, rotate, or shear it relative to its default location One application of this is to make the node expand slightly when the mouse moves over it and return to its original size when the mouse leaves Given all of this, the following code creates and positions the rectangle and text nodes:
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targetWidth 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 var scaleX = 10; var scaleY = 10; var angle = 0; var timeline:Timeline; Stage { title: Center Node scene: Scene { width: 340 height: 200 var rect:Rectangle; var text:Text; content: [ rect = Rectangle { x: 50 y: 40 width: 120 height: 50 fill: ColorYELLOW transforms: bind Scale { x: scaleX y: scaleY pivotX: 50 pivotY: 50 } onMousePressed: function(evt) { timelineplay(); } }, text = Text { content: Centered font: Font { size: 24 } layoutX: bind centerX(rect, text); layoutY: bind centerY(rect, text); rotate: bind angle } ] } }
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