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is implied, so the last color in the stops sequence, namely green, will be used to fill the area outside the gradient circle
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NO_CYCLE
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Figure 15-15
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A square filled with a radial gradient
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Changing the Bounds of the Filled Shape The shape shown in Figure 15-15 is a square and the radial gradient consists of concentric circles of color, where the bounding radius is 075 of the size of the squareWhen the filled shape is a rectangle that is not square, the concentric circles of color become concentric ellipses, as shown in Figure 15-16This is the same RadialGradient as the one used in Figure 15-15 only the width of the filled shape and that of the enclosing stage have been changed5
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Rectangle { x: 10 y: 10 width: 280 height: 180 stroke: ColorBLACK fill: RadialGradient { proportional: true centerX: 05 centerY: 05 radius: 075 stops: [ Stop { offset: 00 color: ColorPINK } Stop { offset: 05 color: ColorWHITE } Stop { offset: 10 color: ColorGREEN } ] } }
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You can find this code in the file javafxnodes/RadialGradient2fx
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15 Node Variables and Events
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Figure 15-16
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A nonsquare rectangle filled with a radial gradient
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The scaling of the radius, which determines the actual shape of the gradient, is actually based on the bounding box of the shape being filled (or stroked) Listing 15-4, from the source code in javafxnodes/RadialGradient3fx, shows an example that uses the same RadialGradient to fill a triangle, constructed using the javafxsceneshapePolygon class that is discussed in the next chapter
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Listing 15-4 A RadialGradient in a Triangle
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package javafxnodes; import import import import import import javafxscenepaintColor; javafxscenepaintRadialGradient; javafxscenepaintStop; javafxsceneScene; javafxstageStage; javafxsceneshapePolygon;
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// RadialGradient in a triangle Stage { title: "Radial Gradient" scene: Scene { width: 200 height: 200 content: [ Polygon { points: [ 100,10, 140,180, 60,180 ] stroke: ColorBLACK fill: RadialGradient { proportional: true centerX: 05 centerY: 05 radius: 075 stops: [
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Stop {offset: 00 color: ColorWHITE } Stop {offset: 05 color: ColorYELLOW } Stop { offset: 10 color: ColorGREEN } ] } } ] } }
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Figure 15-17 shows the gradient produced by this code
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Figure 15-17
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Using a radial gradient to fill a triangle
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This particular triangle is taller than it is wide, so the bounding box is a tall rectangle, which causes the color circles of the gradient to be transformed into ellipses with their major axes aligned along the y-axis Moving the Center of the Gradient If the center of the radial gradient is moved by changing the centerX/centerY values, the gradient effect shifts away from the center of the filled shapeThe code in Listing 155, which you ll find in the file javafxnodes/RadialGradient4fx, uses the RadialGradient from the earlier examples, but with the centerX and centerY values changed to 025 and 075, respectively
Listing 15-5 Moving the Center of a RadialGradient
Stage { title: "Radial Gradient" scene: Scene { width: 200 height: 200 content: [
15 Node Variables and Events
Rectangle { x: 10 y: 10 width: 180 height: 180 stroke: ColorBLACK fill: RadialGradient { proportional: true centerX: 025 centerY: radius: 075 stops: [ Stop { offset: 00 Stop { offset: 05 Stop { offset: 10 ] } } ] } }
color: ColorWHITE } color: ColorYELLOW } color: ColorGREEN }
Figure 15-18 shows the effect of this
Figure 15-18
Moving the center of a RadialGradient
Notice that although the color circles are no longer centered at the middle of the square, they are still concentric Contrast this with the effect of moving the focus, an example of which you ll see in the upcoming Changing the Focus section Effect of Cycle Methods As with linear gradients, the cycleMethod variable determines how the pixels outside the defining circle or ellipse of the RadialGradient are coloredThe default, NO_CYCLE, has the effect of coloring those pixels with the color used in the last Stop, as you have seen in the examples so far in this section If the first Stop in the definition of the gradient is not
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at offset 00, the innermost pixels are filled with the color in the first Stop Here s a gradient that demonstrates this, taken from the file javafxnodes/RadialGradient5fx:
RadialGradient { proportional: true centerX: 05 centerY: 05 radius: 075 stops: [ Stop { offset: 03 color: ColorPINK } Stop { offset: 06 color: ColorWHITE } Stop { offset: 10 color: ColorGREEN } ] }
Because there is no explicit Stop at offset 0, the center of the gradient will be filled with the color used in the first actual Stop in this case, pink Points that are outside the defining circle will be colored with the color of the last Stop, which, in this case, is green See Figure 15-19
Figure 15-19