Tick and Tick Label Customizations in Java

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Tick and Tick Label Customizations
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xAxis: NumberAxis { tickLabelsVisible: false tickMarkVisible: false upperBound: 60 tickUnit: 10 } yAxis: NumberAxis { upperBound: 60 tickUnit: 10 tickLabelFill: ColorRED tickLabelFont: Fontfont("Serif", FontWeightBOLD, FontPostureITALIC, 16); tickLabelTickGap: 0 tickMarkLength: 12 tickMarkStroke: ColorGREEN tickMarkStrokeWidth: 2 }
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You can independently remove the tick marks (that is, the short dashes that indicate the tick locations) and the tick labels (which show the tick value) by setting the tickMarkVisible/tickLabelsVisible variables to false On lines 2 and 3 of Listing 26-13, both of these variables are set to false for the x-axis, with the result that neither tick marks nor labels appear, as you can see at the bottom of Figure 26-17 Note that both the major and minor tick marks disappearYou ll see how to remove just the minor tick marks in the next section
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Figure 26-17
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Examples of tick and tick label customizations
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The tickLabelFill and tickLabelFont variables change the color and font of the tick labels, while the tickLabelTickGap variable controls the space between the labels and the ticks themselves On lines 10 to 13 of Listing 26-13, we change the color of the tick labels to red, select a 16-point, bold and italic font, and reduce the gap between the labels and the tick marks to zero You can change the appearance of the tick marks themselves by using the tickMarkLength, tickMarkStroke and tickMarkStrokeWidth variables, as illustrated on lines 14 to 16 of Listing 26-13The effect of these changes on the y-axis can be seen on the left of Figure 26-17 Minor Ticks On a ValueAxis, minor tick marks can be placed at regular intervals between the major tick marksAs you have already seen, the number of minor tick marks that appear for each major tick mark is determined by the value of the minorTickCount variable, which is 5 by default Two other variables in the ValueAxis class relate to minor ticks: minorTickVisible and minorTickLength Both of these variables are used in the code in Listing 26-14, which you ll find in the file javafxcharts/Customize5fxThe minorTickVisible variable, when set to false, removes minor ticks from an axis while still displaying major ticks, and the minorTickLength variable determines the length of a minor tick Figure 26-18 shows the result of running this code
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Common Customizations
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Figure 26-18 Listing 26-14
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Examples of minor tick customizations
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Minor Tick Customizations
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xAxis: NumberAxis { upperBound: 60 tickUnit: 10 minorTickLength: 3 } yAxis: NumberAxis { upperBound: 60 tickUnit: 10 minorTickVisible: false }
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Custom Tick Formatting The strings that appear in tick labels are simply the result of calling the toString() function of the value associated with that tickYou can override this default behavior for an axis by installing a custom formatter in its ValueAxis objectThe definition of this function, which should be assigned to the formatTickLabel function, is as follows:
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public function formatTickLabel(value:Number):String;
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The xValue and yValue variables of the ScatterDataData class are both of type Number, and the tick labels on the axes of the chart are numbers that include a decimal
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point, even if the values themselves are actually integers, as you can in Figure 26-18 If you know that the tick values are all integers, you can remove the decimal point by installing a replacement formatter, like the one shown in the following code extract, from the file javafxcharts/Customize6fxWhen this code is run, the tick labels on the xaxis no longer show any decimal places, as you can see in Figure 26-19:
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xAxis: NumberAxis { upperBound: 60 tickUnit: 10 formatTickLabel: function(value:Number):String { "{value as Integer}" } }
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Figure 26-19
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Customizing tick labels
Miscellaneous
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Using External Data Sources
Thethe Internet, rich Internetnetwork, or even on yourtohome networkThis chapter essence of a application is its ability display and manipulate data from a corporate
looks at the facilities in the JavaFX platform that enable you to access external data sourcesWe start with the HttpRequest class, which provides a simple way to read data from and write data to a web server External data access is inherently slow, so it is essential to ensure that it does not block the application thread that is responsible for updating the user interfaceThe HttpRequest class takes care of this for you by transparently doing its job in the background, while delivering its results in the user interface thread The second part of this chapter introduces the PullParser class, which allows you to parse a data stream encoded either in XML (Extensible Markup Language) or in JSON (JavaScript Object Notation) XML and JSON are commonly used to encode information returned by RESTful web services, and you see several examples that demonstrate how easy it is to use the HttpRequest class together with the PullParser to retrieve data from a web service, specifically an XML-based web service provided by Twitter and a weather service that uses the JSON formatAt a slightly higher level of abstraction, the JavaFX platform can fetch or subscribe to the content of either an RSS or an Atom feed and parse it into JavaFX objects that are easier for an application to use than raw XML or JSON In the third part of this chapter, we use the feed application programming interfaces (APIs) to create an application that displays information from the Yahoo! weather service and another that lets you search postings on the Twitter website This chapter closes with a discussion of the classes in the javafxasync package, which allow you to safely delegate to a background thread tasks that would otherwise block the user interface for an unacceptable period of timeWe illustrate the general technique by showing you how to write an application that reads records from a database and uses the results to populate a ListView control The classes used in this chapter are all part of the common profile, but some of the example code in this chapter uses APIs that are available only in the desktop profile, so you will find all the example source code in the javafxdata package of the JavaFX Book Desktop project