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GaussianBlur
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GaussianBlur provides a very smooth blurring effect to a node Behind the scenes, the effect works on something called the Gaussian algorithm This algorithm works in a circular pattern from each pixel to smooth the appearance Because this algorithm works in a circular pattern, the parameter you need to work with is the radius parameter, which controls how far out from each pixel the Gaussian algorithm is applied
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7: Applying Effects and Transformations
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Figure 7-3 Background modified using ColorAdjust
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You can specify a value from 0 to 63 for the radius of the GaussianBlur A value of 0 would be little to no blur in the original image, whereas a value of 63 would be an extreme blur The following code implements a GaussianBlur with a radius of 10:
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effectToApply = GaussianBlur{ radius: 10; }
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Apply the GaussianBlur to your ApplyEffects() function as follows:
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function ApplyEffects() : Effect{ var effectToApply : Effect; effectToApply = GaussianBlur{ radius: 10; } return effectToApply; }
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JavaFX: A Beginner s Guide
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Run your completed script, which blurs the background with a radius of 10 The result is shown in Figure 7-4 Notice that the background is slightly blurred, but still recognizable Now change the radius to 60 and recompile the script The results are shown in Figure 7-5 GaussianBlur is particularly effective when you are trying to resize images Occasionally an image can become distorted when it is resized, especially if the image is quite sharp before it is resized Applying a very light GaussianBlur before resizing the image (in systems that do not do so automatically) can make the resized image less distorted You learn about the Glow effect next
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Figure 7-4 Background with a GaussianBlur radius of 10
7: Applying Effects and Transformations
Figure 7-5 Background with a GaussianBlur radius of 60
Glow
The Glow effect, as the name suggests, makes your node appear to glow The amount of glow applied to the node is controlled by the level parameter The level of glow you can apply to a node ranges from 0 to 1 Assigning no level for the Glow effect will cause JavaFX to use a default of 3 Earlier in this chapter you learned about the Bloom effect, which applied a Glow-like effect to your node The difference between Bloom and Glow is in the way the glow is applied Whereas Bloom only applies a glow to the higher contrast parts of an image, Glow works on the entire image
JavaFX: A Beginner s Guide
The following code shows your ApplyEffects() function with a Glow level of 5:
function ApplyEffects() : Effect{ var effectToApply : Effect; effectToApply = Glow{ level: 1 } return effectToApply; }
Replace the ApplyEffects() function in your current script with this one Your full script should now look like this:
/* * 7fx * * v10 - J F DiMarzio * * 5/20/2010 created * * Applying Effects * */ package comjfdimarziojavafxforbeginners; import import import import import import javafxstageStage; javafxsceneScene; javafxfxdFXDNode; javafxsceneGroup; javafxsceneimageImageView; javafxsceneeffect*;
var imagePath : String = "{__DIR__}images/butterflyfxz"; var butterflyImage : FXDNode = FXDNode{ url: imagePath; }; Stage { title : "Effects" scene: Scene { width: 800 height: 600 content: [ SetImages(butterflyImage) ] } } function SetImages(image : FXDNode) : FXDNode { var butterfly : ImageView; var background : ImageView;
7: Applying Effects and Transformations
butterfly = (imagegetNode("butterfly") as ImageView); background = (imagegetNode("background") as ImageView); butterflytranslateX = -50; butterflytranslateY = -50; backgroundeffect = ApplyEffects(); return image; } function ApplyEffects() : Effect{ var effectToApply : Effect; effectToApply = Glow{ level: 1 } return effectToApply; }
Compile and run your script Your background image should glow like the one shown in Figure 7-6 The next effect you learn about is the DropShadow effect
Figure 7-6 Background with a Glow of 5
JavaFX: A Beginner s Guide
DropShadow
The DropShadow effect creates a shadow under your node by replicating the node in a shadow color and offsetting the shadow image by a specific amount under your source node Quite a few parameters are needed to configure DropShadow: radius Used like the radius parameter for GaussianBlur height/width Can be used instead of radius; has the same effect
spread The opacity of the shadow A value of 0 creates a very light, scattered shadow, whereas 1 produces a dark, sharp shadow blurType The algorithm used to create the shadow This can be set to Gaussian, ONE_, TWO_, or THREE_PASS_BOX color The color of the shadow; defaults to BLACK Modify your ApplyEffects() function to create a DropShadow effect, as follows:
function ApplyEffects() : Effect{ var effectToApply : Effect; effectToApply = DropShadow{ radius : 10; offsetX: 10; offsetY: 10; spread: 2; blurType : BlurTypeTHREE_PASS_BOX; } return effectToApply; }
Rather than apply this effect to the background as you have been doing, try applying it to the butterfly Take a look at the full script to see how this effect is applied to the butterfly:
/* * 7fx * * v10 - J F DiMarzio * * 5/20/2010 created * * Applying Effects * */
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