java 将文本设置为随机颜色和不透明度 javaFX
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Set text to random color & opacity javaFX
提问by Sunny Dhillon
I need a javafx program to set text to a random color and opacity I'm not sure on how to do it? here is a sample of my code
我需要一个 javafx 程序来将文本设置为随机颜色和不透明度我不知道该怎么做？这是我的代码示例
Text text1 = new Text();
text1.setText("Java");
text1.setFont(Font.font("Times New Roman", FontWeight.BOLD, FontPosture.ITALIC, 22));
text1.setRotate(90);
gridpane.add(text1, 3, 1);
回答by CAD97
You can use Math.random()to generate a Doublein the range [0,1), so you need to do:
您可以使用在 range 中Math.random()生成一个，因此您需要执行以下操作：Double[0,1)
text.setOpacity(Math.random());
text.setOpacity(Math.random());
Color took a little more digging through the docs, but can be accomplished with:
颜色需要更多地挖掘文档，但可以通过以下方式完成：
text.setFill(Color.color(Math.random(), Math.random(), Math.random());
text.setFill(Color.color(Math.random(), Math.random(), Math.random());
setFillcomes from Shape, which Textinherits from. setFilltakes a Paint, which Coloris the simplest implementation of. Color.color(double, double, double)takes the rgb value with doubles in the range [0,1].
setFill来自Shape，它Text继承自。setFill需要一个Paint，这Color是最简单的实现。Color.color(double, double, double)使用范围 [0,1] 中的双精度 rgb 值。
Learn how to navigate through the docs and you'll be able to find these sorts of things on your own quickly in the future!
了解如何浏览文档，将来您将能够自己快速找到这些类型的东西！
Note: opacity/rgb color all take doubles of the range [0,1] where Math.random()produces in the range [0,1). If you're unfamiliar with this notation, this means Math.random()will NEVER produce 1, only a number smaller than 1 by possible accuracy. This means that you will never have a 100% fully opaque/r/g/b with this method but in reality you probably can't tell the difference, so it's better to use the less complicated method.
注意：不透明度/RGB 颜色都采用范围 [0,1] 的两倍，其中Math.random()产生范围 [0,1)。如果你不熟悉这个符号，这意味着Math.random()永远不会产生 1，只有一个小于 1 的数字可能的准确性。这意味着用这种方法你永远不会有 100% 完全不透明的/r/g/b，但实际上你可能无法区分差异，所以最好使用不太复杂的方法。
Note 2: javafx.scene.paint.Color#coloractually provides a four-argument constructor that includes opacity, but I would recommend setting the opacity of the Text node itself as above rather than the opacity of the Paint.
注 2：javafx.scene.paint.Color#color实际上提供了一个包含不透明度的四参数构造函数，但我建议将 Text 节点本身的不透明度设置为上述，而不是 Paint 的不透明度。
