用 Java 写桌面应用，像素由自己绘制。

import limn.backend.Backend;
import limn.backend.NativeWindow;
import limn.backend.WindowConfig;
import limn.backend.lwjgl.LwjglBackend;
import limn.components.Button;
import limn.components.Label;
import limn.scene.Insets;
import limn.scene.Scene;
import limn.scene.layout.Column;
import limn.scene.layout.Padding;

/** A window with a label and a button that closes it. */
public final class HelloWindow {

    public static void main(String[] args) {
        // macOS needs -XstartOnFirstThread on the JVM command line; it is macOS-only and a
        // JVM elsewhere given it will not start.
        try (Backend backend = new LwjglBackend()) {
            NativeWindow window = backend.createWindow(
                    WindowConfig.of("Hello, Limn", 480, 320));

            Column column = new Column();
            column.gap(12);
            column.add(new Label("A window, drawn by Limn."));
            column.add(new Button("Close").onAction(window::requestClose));

            Scene scene = new Scene(new Padding(Insets.all(24), column));
            scene.bind(window);

            backend.runEventLoop();
        }
    }
}