"Clip" correct for background with round edge

Hi all. I'm having a problem with a round border and a round bottom. If you look at the code below, you will see that I have a border specified with a radius of 5. If I run the present, the bottom sticks outside the border. If I put also the context in which a radius of 5, it still seems wrong since the outside of the border turns to purple while I expect it to be the red light. If I change the bottom radius of 4 then the inside of the border is not quite equal to the background.

How to define a border and just tell the background needs to be 'cut' by it?

Thank you, Nick.

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class RoundTest extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        FlowPane flowPane = new FlowPane();
        Scene scene = new Scene(flowPane, 500, 500);
        flowPane.setStyle("-fx-padding: 10;");
        Label label = new Label("Hello");
        label.setStyle("-fx-border-color: red; -fx-border-radius: 5; -fx-background-color: blue;");
//        label.setStyle("-fx-border-color: red; -fx-border-radius: 5; -fx-background-color: blue; -fx-background-radius: 5;");
        flowPane.getChildren().add(label);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

It's actually sort of a difficult question to answer well.

The standard style sheet caspian.css for JavaFX 2.2 almost does not use of the borders.
The standard controls of the Caspian have things that look like borders or edges highlighted, but they are almost always implemented by stratified environments.
For example, a ring around a button is a blue background which is placed under the bottom of the key, making the ring to resemble a border, even if it is not.

I don't really know why the bottom layer approach was chosen on a border + approach background. The possible reasons are:
-It is easier.
-its performance is superior.
-It provides a better visual experience.
Maybe it's one or all of the above.

Nevertheless, I think that there was probably a good reason why the bottom layer approach has been chosen, then you would probably better stick.
One of the advantages of this approach are there are many similar examples in the caspian.css that you can copy from and use.

An example of string of css style for your sample using boundary layers app could be something like:

-fx-padding: 1;  -fx-background-insets: 0, 1;  -fx-background-radius: 5, 5;  -fx-background-color: firebrick, forestgreen;

Playing with combinations of laminates circles, padding and background-inserts you can get, borders around your controls which can be either entirely encapsulated in layout standard of your control or outside of it (like the focus ring), so that when you add something as a focus ring around your control, it is not movement of the control on the screen - it really just surrounds the control.

An updated version of your application example that uses it is below:

import javafx.application.Application;
import javafx.scene.*;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class RoundTest extends Application {
  @Override public void start(Stage stage) throws Exception {
//    System.setProperty("prism.lcdtext", "false");
    StackPane stackPane = new StackPane();
    Scene scene = new Scene(stackPane, 500, 500, true);
    stackPane.setStyle(
        "-fx-background-color: cornsilk;"
      + " -fx-border-insets: 10;"
      + " -fx-border-color: rgba(128, 128, 128, 0.5)"
    );
    Label label = new Label("Hello");
    label.setStyle(
//        "-fx-padding: 5;"
//      + " -fx-background-insets: 0, 5;"
//      + " -fx-background-radius: 5, 5;"
        "-fx-padding: 1;"
      + " -fx-background-insets: 0, 1;"
      + " -fx-background-radius: 5, 5;"
      + " -fx-background-color: firebrick, forestgreen;"
      + " -fx-text-fill: whitesmoke;"
    );
//    label.setScaleX(5);
//    label.setScaleY(5);
    stackPane.getChildren().add(new Group(label));
    stage.setScene(scene);
    scene.setCamera(new PerspectiveCamera());

    stage.show();
  }

  public static void main(String[] args) { launch(args); }
}

Now for other questions you raise:

If I run the present, the bottom sticks outside the border

Yes, the background properties border radius and radius are independent, so if you use a rounded edge, you must also use a rounded background or the background will extend beyond the corners of the border.

If I put also the context in which a radius of 5, it still doesn't seem right because outside of the border turns to purple while I expect it to be the red light

JavaFX 2.2 uses anti-aliasing just about all of it is rendered (and even something else for lcd called sub-pixel text rendered in some cases). Your edge is a single pixel wide. If the border is not exactly sitting on a pixel boundary, it will mingle in the background. Even if the sides of the border to sit exactly on the boundary of the pixel, when the border turns corners, smoothing algorithms are suddenly stirring the corner of the border and the background around the inside edge of the corner.

You have chosen a green background and a red border. When you mix these two colors, you get purple (which is what's happening).

I don't know of anyway to turn on or turn off rendering of smoothing for the JavaFX scene graph objects (perhaps something to do that might come along for the ride with the support of Java 8 3D scene graph).

Regardless, you probably want to anti-aliasing for your rendering anyway. If you develop your application, knowing that anti-aliasing will happen. To do this, choose colors that marry well when anti-aliasing. Caspian done by deriving a lot of foreign background colors inner background colors (i.e. any relief or darkening of the border). It works well because they have the same mix of basic RGB, just in different portions component, so anti-aliasing mixes seamlessly. Full of choice colors at opposite ends of the RGB Spectrum as red and blue translates jarring mixtures as violet. Even if anti-aliasing is not in question, your eyes can play you tricks and have trouble seeing clearly the boundary between this kind of colors due to the strange optics of the eyes.

Another strategy to alleviate the nasty mix is to use more pixels, for example instead of a one pixel border, use a border of two pixels - mixture of anti-aliasing will be much less noticeable. Using the strategy of greater pixel works very well in conjunction with the new screens of higher resolution (the so-called retina displays), where the pixels themselves are so small that the human eye is unable to distinguish the pixels and how they blend together.

All that being said - your original example with rounded edges and bottom doesn't look too bad to me :-)

-------------

Another question that I fell on during the test, it is that there is a css attribute - fx-border-style, that can have the values of centered, inside and outside, and when I tried to put I got messages like:

WARNING: declaration of com.sun.javafx.css.parser.CSSParser style of analysis error CSS online ' - fx - padding: 1; -fx-background-inserts: 0, 1; -fx-background-RADIUS: 5, 5; -fx-background-color: brick refractories, forestgreen; -fx-border-style: inside; -fx-text-fill: whitesmoke;' of javafx.scene.Node$22@1bd5d8ab: not supported the of 'inside' when parsing "border - fx - style' to [1 138].

The css reference note to guide the border feature copy of the w3c background and border features, but there is no nut, silverside, border style centered in the w3c css reference, so I guess that there is a mistake in the JavaFX 2 css documentation it around which is taken in charge and what is implemented of the w3c css reference. Note that I'm not really that JavaFX css processing must correspond to the reference of css of w3c that I find the system complicated and difficult to understand w3c.

http://docs.Oracle.com/JavaFX/2/API/JavaFX/scene/doc-files/cssref.html#region
http://www.w3.org/TR/CSS3-background/#border-style

Perhaps as borders in css do not seem to be used much in JavaFX, the issue of documentation is not such a big.

Tags: Java

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