Coordinates, Transforms, and Layout in Java

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17 Coordinates, Transforms, and Layout
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Scaling and a Translate Transform Our second example uses the scaleX variable in the node together with a Translate object in the transforms variable:
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Rectangle { x: 30 y: 60 width: 100 height: 40 fill: ColorYELLOW scaleX: 15 transforms: [ Transformtranslate(10, 0) ] }
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Figure 17-20 shows the result
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Figure 17-20
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Using scaleX with a Translate transform
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Here s how the transformation worksThe first step is to apply the scaleX valueAs mentioned earlier in this chapter, scale operations based on the scaleX and scaleY variables take place about the center of the node and leave the position of the center unchanged Before the scale, the center was at x = 80, y = 80, and it will remain here after the scale, even though the node s width will increase from 100 to 150 For this to be possible, the x coordinate of the node as measured in the coordinate space of the Scene must be changed to 80 75 (half the width), or 5 Because scaleY is implicitly 10, there is no change in the y coordinate or height of the nodeAt this point,, the bounds of the rectangle relative to the scene are x = 5, y = 60, width = 150, height = 40 Now, we apply the translation, which is by 10 pixels in the x direction However, this is 10 pixels measured in the coordinate space of the rectangle, which has been scaled by a factor of 15 in the x directionTherefore, the translation as seen in the scene s coordinate space is 10 * 15 = 15 pixels along the x-axisAdding 15 to current x coordinate of 5 gives 20,
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Clipping
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so the final bounds of the rectangle in the scene s coordinate space are x = 20, y = 60, width = 150, and height = 40This is exactly the result shown in Figure 17-20
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Clipping
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Normally, when you add a node to a scene, you want the entire node to be rendered, and this is what happens by default Under some circumstances, however, you might want the user to be able to see only part of a nodeAn example of this is shown in Figure 17-21
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Figure 17-21
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Showing part of a node
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At first glance, it might appear that you are looking at an image that is overlaid with a black rectangle with a circular hole in itThe scene does, in fact, contain a rectangle and an image (in an ImageView node), but the rectangle is actually behind the image, not in front of it Normally, if you were to place an ImageView in front of a rectangle of the same size, the rectangle would be completely covered and therefore obscured by the ImageView In this case, only that portion of the ImageView that lies inside a circular area is being rendered, thus allowing the parts of the rectangle that are outside that area to be seen The partial rendering of a node is achieved by setting its clipThe clip is itself a node When you associate a clip with a node, only the part of that node that is covered by the interior of the clip node is renderedThe following code, which is the implementation of the example in Figure 17-21, shows how to apply a clip:
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1 2 var image:Image = Image { url: {__DIR__}images/portsmouthSmalljpg
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17 Coordinates, Transforms, and Layout
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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
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}; var imageView:ImageView; Stage { title: Clip #1 scene: Scene { width: imagewidth height: imageheight content: [ Rectangle { width: bind imagewidth height: bind imageheight fill: ColorBLACK } imageView = ImageView { var centerX = imagewidth / 2 var centerY = imageheight / 2 image: image clip: bind Circle { centerX: centerX centerY: centerY radius: 100 } onMouseDragged: function(evt) { centerX = evtx; centerY = evty; } } ] } }
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The circle that defines the clip is created on lines 20 to 24 and is assigned to the clip variable of the ImageView nodeThe clip node exists in the same coordinate space as the ImageView node to which it is applied, so the code on lines 17 and 18 that declares and assigns the centerX and centerY variables, together with the assignment of these values to the same variables of the circle object, cause the clip to be centered over the mid-point of the ImageViewTherefore, the clip initially allows only a circular area around the center of the ImageView to be seen, as shown in Figure 17-21 To make this example more interesting, the mouse handler declared on lines 25 to 28 causes the centerX and centerY variables to be set to the location of the mouse if the mouse is pressed and then dragged while it is over the clipped part of the ImageView Because the value of the clip variable is bound to a circle whose center point depends on these variables, the result will be that clicking the mouse inside the clipped area and then dragging it around will cause the circle, and therefore the clipping area, to follow the mouse, giving the impression of a window that can be moved around to show different parts of the imageThis works only if the mouse is initially clicked inside the circle,
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