Shapes, Text, and Images in Java

Generation QR-Code in Java Shapes, Text, and Images
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required values If you need to preserve the aspect ratio of the image, which would normally be the case, set preserveRatio to trueWhat actually happens depends on the value of this variable First, let s assume that preserveRatio is false In this case
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If width is greater than 0, the image will be scaled to the specified width If width is 0, the image will have its natural width10 If height is greater than 0, the image will be scaled to the specified height If height is 0, the image will have its natural height
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Because preserveRatio is false, the aspect ratio can be adjusted arbitrarily by changing the relative values of the width and height variablesThe following code, which you ll find in the file javafxshapes/Images6fx, changes the width of an image to 100 pixels, but leaves its height unchangedThis results in the long, thin image shown in Figure 16-35
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Stage { title: "Images 6" scene: Scene { width: 200 height: 450 content: [ ImageView { image: Image { backgroundLoading: true url: url preserveRatio: false width: 100 } } ] } }
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When preserveRatio is true, there are four possible cases:
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If width and height are both 0, no resize has been requested, and the image will retain its natural size If width is greater than zero and height is 0, the image will be scaled to the given width, and the height will be adjusted so that the aspect ratio is preserved If height is greater than zero and width is 0, the image will be scaled to the given height, and the width will be adjusted so that the aspect ratio is preserved
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Negative values for either width or height are treated as 0, so the image will not be resized
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Images
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Figure 16-35
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Resizing an image without preserving the aspect ratio
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If height and width are both greater than 0, the image will be scaled so that its width and height are not greater than the given values and so that the aspect ratio is still preserved
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javafxshapes/Images7fx, specifies
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Some examples should make this clearerThe following code, from the file a width of 200 while preserving the aspect ratio:
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Stage { title: "Images 7" scene: Scene { width: 200 height: 220 content: [ ImageView { image: Image { backgroundLoading: true url: url preserveRatio: true width: 200 } } ] } }
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16 Shapes, Text, and Images
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The actual width of this image is 380 pixels Scaling it to 200 pixels is a reduction by a factor of 19To preserve the aspect ratio, the height must also be scaled from 382 pixels by the same factor, which results in a final height of 201 pixels and the result shown in Figure 16-36
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Figure 16-36
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Resizing an image to a specified width while preserving the aspect ratio
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This code, which you ll find in the file javafxshapes/Images8fx, sets values for both the width and the height variables:
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Stage { title: "Images 8" scene: Scene { width: 300 height: 250 content: [ ImageView { image: Image { backgroundLoading: true url: url preserveRatio: true width: 300 height: 250 } } ] } }
When both values are set, the image must be scaled to meet both limits, while also preserving the aspect ratio In this case, the image is actually 380 pixels wide but must be reduced to 300 pixels, which is a reduction by a factor of 127 Scaling the height by the same factor reduces it from 382 to 300 pixelsThis is still greater than the 250 pixels
Images
allowed, so the height must be scaled by a further factor of 12This same factor must also be applied to the width, bringing it down from 300 to 250, as well, and thus preserving the aspect ratio Figure 16-37 shows the result
Figure 16-37
Resizing an image within specified bounds while preserving the aspect ratio
Resizing an image will either lose information (if the image is made smaller) or require interpolation of pixel data (if the image is enlarged)To produce a high-quality result can be a relatively slow process, so the JavaFX runtime allows you to make a tradeoff between quality and speed of execution If quality is more important than execution speed, set the smooth variable of the Image object to true (which is the default) On the other hand, if execution speed is more important and you can accept a lower quality result, set smooth to false