JavaFX解决描边（stroke）显示不全的问题

先看问题：

 

var rec1: Rectangle;

var stage: Stage = Stage {
    title: "Rectangles"
    width: 200
    height: 200
    scene: Scene {
        content: [
            VBox {
                spacing: 0
                content: [
                    rec1 = Rectangle {
                        fill: Color.BLACK
                        width: bind stage.scene.width
                        height: 50
                    }
                    Rectangle {
                        fill: Color.GRAY
                        width: bind stage.scene.width
                        height: bind stage.scene.height - rec1.height
                        stroke: Color.BLACK
                    }
                ]
            }
        ]
    }
}

 

显示如下：

 

结果发现下面的矩形缺少了右侧和底部的描边。查看API也没有找到原因，后来做个小实验，发现原来描边操作是在原有图形的边框上添加的。

 

测试：

function run() {
    var rec1 = Rectangle { width: 140, height: 90 };
    var rec2 = Rectangle { width: 140, height: 90, stroke: Color.BLACK };
    println("width={rec1.width} and height={rec1.height}");
    println("width={rec1.layoutBounds.width} and height={rec1.layoutBounds.height}");
    println("width={rec2.width} and height={rec2.height}");
    println("width={rec2.layoutBounds.width} and height={rec2.layoutBounds.height}");
}

 结果：

width=140.0 and height=90.0
width=140.0 and height=90.0
width=140.0 and height=90.0
width=142.41422 and height=92.414215

注意width和layoutBounds.width的区别！

 

解决问题的办法：

var rec1: Rectangle;
var tmp1 = Rectangle { stroke: Color.BLACK };
var tmp2 = Rectangle { };
var gap = tmp1.layoutBounds.width-tmp2.layoutBounds.width;

var stage: Stage = Stage {
    title: "Rectangles"
    width: 200
    height: 200
    scene: Scene {
        content: [
            VBox {
                spacing: 0
                content: [
                    rec1 = Rectangle {
                        fill: Color.BLACK
                        width: bind stage.scene.width
                        height: 50
                    }
                    Rectangle {
                        fill: Color.GRAY
                        width: bind stage.scene.width - gap
                        height: bind stage.scene.height - rec1.layoutBounds.height - gap
                        stroke: Color.BLACK
                    }
                ]
            }
        ]
    }
}

 

显示如下：

问题是解决了，但是总感觉哪里有些别扭，难道JavaFX就没有相关的常量来记录这个差距吗？或者有其他的办法来解决这个问题，期待更好的解决办法。