Building the SnowStorm Application in Java

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Building the SnowStorm Application
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change the string that is displayed and to make the text a little smaller, modify the content variable of the text object and the size variable of the embedded font object, like this6:
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Text { font : Font { size: 20 } x: 10, y: 30 content: "Snowflakes: 0" }
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// New font size
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// New (temporary) text
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Note
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The elements in a sequence are usually separated by commas, like this: [1, 2] Note, however, that the initializers for the ImageView and Text objects are separated only by whitespace, because this is how the code is written by the IDE when you drop a value into a sequence initializer The compiler will, in fact, accept sequence elements that are separated by whitespace rather than commas (as long as the elements are object literals), but we will often include the comma separators in the code examples in this book
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Next, we need to arrange for the text to appear near the bottom of the image instead of near the topThe position of the text is given by its x and y variablesThese are given relative to the upper-left corner of the scene, which has coordinates x = 0 and y = 0The x and y values increase as you move from left to right and from top to bottom, respectively, as shown in Figure 4-8
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x axis x=0 y=0
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y axis
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Figure 4-8
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The coordinate system
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To get the text to appear where we want it to, we need to set the y coordinate of the text object to be 10 pixels less than the height of the sceneTo do this, we need to get the height of the scene, which is available from its height variableTo get access to the value of this variable, we need another variable that refers to the scene object itself Here s how
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You ll find a full discussion of text and fonts in 16, Shapes, Text, and Images
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4 A Simple JavaFX Application
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the code looks when the lines that correctly position the Text node has been added, with the changes highlighted in bold:
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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 package javafxexample; import import import import import import javafxstageStage; javafxsceneScene; javafxsceneimageImageView; javafxsceneimageImage; javafxscenetextText; javafxscenetextFont;
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// The scene that contains the snow var scene:Scene; Stage { title: "JavaFX Snow Storm" resizable: false scene: scene = Scene { content: [ ImageView { image: Image { url: "{__DIR__}SnowScenepng" } } Text { font : Font { size: 20 } x: 25 y: bind sceneheight - 10 content: "Snowflakes: 0" } ] } }
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Line 11 declares a variable called scene that we use to hold a reference to the scene; we set its value on line 16 when the scene property of the stage object is being initialized:
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Stage { title: "JavaFX Snow Storm" resizable: false scene: scene = Scene {
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The expression scene = Scene { } first assigns the Scene reference to the variable declared on line 11 and then returns the value of that variableThis return value is then assigned to the scene property of the stage By using this syntax, we can keep the declaration of the scene object nested inside the object literal for the stageThis
scene
Building the SnowStorm Application
makes the code slightly more readable than the alternative, which would be to declare and initialize the scene object in the same place as the scene variable, like this:
var scene:Scene = Scene { // Initializers as shown in the code above }; Stage { title: "JavaFX Snow Storm" resizable: false scene: scene }
The code that positions the text object is shown on lines 27 and 28 Notice that we moved the text slightly to the right by changing its x coordinate from 10 to 25The code that sets the y value is worthy of a little more discussion: