Coordinates and Screens in Java

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Coordinates and Screens
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var random = randnextDouble(); // Add some random sideways movement var x = snowflakecenterX; if (random > 07) { x += snowDriftDistance; } else if (random < 03) { x -= snowDriftDistance; } x = Mathmax(imageBoundsminX + snowflakeRadius, x); snowflakecenterX = Mathmin(x, imageBoundsmaxX - snowflakeRadius); // If the snowflake is off the screen, remove it if (snowflakecenterY >= imageBoundsmaxY) { delete snowflake from scenecontent; delete snowflake from snowflakes; } } }
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The changes on lines 14 to 16 ensure that the random lateral motion applied to a snowflake does not take it outside the bounds of the snow areaThis is necessary because if we were to allow this and the image is narrower than the scene, we would see snowflakes in the margin area to the left and right of the imageThe second change, on line 19, ensures that snowflakes are removed as they reach the bottom of the image, not when they reach the bottom of the scene With these changes, the application now runs properly on my JavaFX developer phone, as you can see in Figure 17-58
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Coordinates and Screens
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So far, we have assumed that your applications are running on a system with only one screenThis is not always the case It is quite common to have desktop systems with two, four, or even more screensWhen this is the case, it is possible for either the user or your application to place a stage on any of the screensA JavaFX application can discover how many screens are available, their sizes, and how they are positioned relative to other screens, by using the javafxstageScreen class, which we discuss in this section
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You can get information about the screens on your system from the script variables screens and primary of the Screen classThe screens variable is of type Screen[], while primary is a single Screen object that refers to the primary display for your system Table 17-14 describes the variables of the Screen class
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17 Coordinates, Transforms, and Layout
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Figure 17-58
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The modified SnowStorm application on a JavaFX phone
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Table 17-14 Variable
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Variables of the Screen Class Type
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Number
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The screen resolution in dots per inch The actual bounds of the screen The visual bounds of the screen, which are always contained by the actual bounds
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bounds
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Rectangle2D
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visual Bounds
Rectangle2D
The code in Listing 17-9 uses the Screen API to get and print the details of all the screens attached to the system on which it is run It also creates a stage that displays the coordinates of its top-left corner in its title barWe will use this stage to show how the coordinate system is affected by the presence of more than one screen11
You ll find this code in the file javafxtransforms/Screens1fx in the JavaFX Book GUI project
Coordinates and Screens
Listing 17-9
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Using the Screen API
var screens = Screenscreens; var primary = Screenprimary; var index = SequencesindexOf(screens, primary); println( Number of screens: {sizeof screens} ); println( Index of primary: {index} ); for (i in [0<sizeof screens]) { var screen = screens[i]; println( Screen {i} ); println( DPI: {screendpi} ); println( Bounds: {screenbounds} ); println( Visual bounds: {screenvisualBounds} ); println( ); } var stage:Stage = Stage { title: bind Position: ({stagex}, {stagey}) width: 400 height: 300 }
The first part of this code, lines 1 to 14, gets the Screen objects that represent all the attached displays and the Screen object for the primary display It then prints the number of displays that it found, the index of the primary display, and the details for each of them Here s the output when I run this script on my laptop with only its inbuilt display attached:
Number of screens: 1 Index of primary: 0 Screen 0 DPI: 960 Bounds: Rectangle2D [minX = 00, minY=00, maxX=12800, maxY=8000, width=12800, height=8000] Visual bounds: Rectangle2D [minX = 00, minY=00, maxX=12800, maxY=7700, width=12800, height=7700]
The bounds and visual bounds are expressed in terms of a global coordinate system that covers all the attached displaysYou ll learn more about this in the next sectionYou can see that these two bounds are not always the sameThe difference between them is that the bounds variable refers to the size of the screen itself, while the visualBounds variable corresponds to the usable area In this case, the visual bounds are smaller in height by 30 pixels because of the Windows taskbar, which appears at the bottom of the display area If I change my display settings so that the taskbar is auto-hidden, the visual bounds and the bounds would be the same