java 使矩形透明
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Make Rectangle transparent
提问by Stéphane GROSSMANN
I need to make a drawn rectangle mouse transparent, in order to see the desktop. The following code draws my rectangle. What should I add to get that ? Thanks for help
我需要使绘制的矩形鼠标透明，以便看到桌面。以下代码绘制了我的矩形。我应该添加什么来获得它？感谢帮助
public void start(Stage primaryStage) {
Group group = new Group();
Rectangle rect = new Rectangle(20,20,200,200);
rect.setArcHeight(15);
rect.setArcWidth(15);
rect.setStroke(Color.BLACK);
group.getChildren().add(rect);
Scene scene = new Scene(group, 300, 200);
primaryStage.setScene(scene);
primaryStage.show();
}
采纳答案by Uluk Biy
Since the screen graph in JavaFX is in a hierarchical structure, to show desktop you need to also make the Stageand Scenetransparent, and use shape "arithmetic":
由于 JavaFX 中的屏幕图是分层结构的，要显示桌面，您还需要使Stage和Scene透明，并使用形状“算术”：
@Override
public void start(Stage stage) {
Group group = new Group();
Rectangle rect = new Rectangle(0, 0, 350, 300);
Rectangle clip = new Rectangle(20, 20, 200, 200);
clip.setArcHeight(15);
clip.setArcWidth(15);
Shape shape = Shape.subtract(rect, clip);
shape.setFill(Color.GRAY);
group.getChildren().add(shape);
Scene scene = new Scene(group);
scene.setFill(Color.TRANSPARENT);
stage.initStyle(StageStyle.TRANSPARENT);
stage.setScene(scene);
stage.show();
}
Later you can add draggable feature to the pane/group.
稍后您可以向窗格/组添加可拖动功能。
回答by James_D
If you just want the interior of the rectangle to be transparent, then all you need is
如果你只是想让矩形的内部是透明的，那么你所需要的就是
rect.setFill(Color.TRANSPARENT);
but I'm not quite sure if this is what you mean.
但我不太确定这是否是您的意思。
回答by Kamil Janyga
If I understand you correctly as I don't get this mouse part of 'drawn rectangle mouse transparent' - your rectangle should be transparent?
如果我理解正确，因为我没有得到“绘制矩形鼠标透明”的这个鼠标部分 - 你的矩形应该是透明的？
You have to change the opacity of a rectangle: rect.opacityProperty().set(0.5);
您必须更改矩形的不透明度： rect.opacityProperty().set(0.5);
