我正在为逻辑电路编写类似CAD的程序（这是我的第一个“图形密集型”程序）。当我在原理图上放置一个组件时，让我们说一个AND门（它的根类为Region类），我希望能够与它进行交互（选择它，更改其属性等）。到现在为止还挺好。我可以点击它，一切顺利。但是，如果我在其外部单击，鼠标单击事件仍将组件显示为源（！）。
进一步挖掘，我在鼠标点击处理程序中添加了一些痕迹，发现getBoundsInLocal()和getBoundsInParent()返回的边界比它应该大50％左右。 getLayoutBounds()，getWidth()和getHeight()确实返回了正确的值。
布置组件的窗格是一个简单的Pane对象，但它使用setScaleX()和setScaleY()来实现缩放功能。我确实试图禁用它们，没有运气。
public abstract class SchematicComponent
extends Region {
private Shape graphicShape = null;
public Shape getGraphicShape() {
if( isShapeDirty() ) {
if( graphicShape != null ) {
getChildren().remove( graphicShape );
}
graphicShape = createShape();
markShapeDirty( false );
if( graphicShape != null ) {
getChildren().add( graphicShape );
}
}
return graphicShape;
}
abstract protected Shape createShape();
}
abstract public class CircuitComponent
extends SchematicComponent {
}
abstract public class LogicGate
extends CircuitComponent {
@Override
protected void layoutChildren() {
super.layoutChildren();
Pin outPin;
final double inputLength = getInputPinsMaxLength();
// Layout the component around its center.
// NOTE: I did try to set the center offset to 0 with no luck.
Point2D centerOffset = getCenterPointOffset().multiply( -1 );
Shape gateShape = getGraphicShape();
if( gateShape != null ) {
gateShape.setLayoutX( centerOffset.getX() + inputLength );
gateShape.setLayoutY( centerOffset.getY() );
}
/* Layout the output pins. */
outPin = getOutputPin();
if( outPin != null ) {
outPin.layout();
outPin.setLayoutX( centerOffset.getX() + getWidth() );
outPin.setLayoutY( centerOffset.getY() + getHeight() / 2 );
}
/* Compute the first input pin location and the gap between each
pins */
double pinGap = 2;
double y;
if( getInputPins().size() == 2 ) {
y = centerOffset.getY() + getHeight() / 2 - 2;
pinGap = 4;
}
else {
y = centerOffset.getY() + ( getHeight() / 2 ) - getInputPins().size() + 1;
}
/* Layout the input pins */
for( Pin inPin : getInputPins() ) {
inPin.layout();
inPin.layoutXProperty().set( centerOffset.getX() );
inPin.layoutYProperty().set( y );
y += pinGap;
}
}
}
// The actual object placed on the schematic
public class AndGate
extends LogicGate {
@Override
protected double computePrefWidth( double height ) {
// NOTE: computeMin/MaxWidth methods call this one
double width = getSymbolWidth() + getInputPinsMaxLength();
double length = 0;
width += length;
if( getOutputPin().getLength() > 0 ) {
width += getOutputPin().getLength();
}
return width; // Always 16
}
@Override
protected double computePrefHeight( double width ) {
// NOTE: computeMin/MaxHeight methods call this one
return getSymbolHeight() + getExtraHeight(); // Always 10
}
@Override
protected Shape createShape() {
Path shape;
final double extraHeight = getExtraHeight();
final double inputLength = getInputPinsMaxLength();
final double outputLength = getOutputPin().getLength();
/* Width and Height of the symbol itself (i,e, excluding the
input/output pins */
final double width = getWidth() - inputLength - outputLength;
final double height = getHeight() - extraHeight;
/* Starting point */
double startX = 0;
double startY = extraHeight / 2;
ArrayList<PathElement> elements = new ArrayList<>();
elements.add( new MoveTo( startX, startY ) );
elements.add( new HLineTo( startX + ( width / 2 ) ) );
elements.add( new ArcTo( ( width / 2 ), // X radius
height / 2, // Y radius
180, // Angle 180°
startX + ( width / 2 ), // X position
startY + height, // Y position
false, // large arc
true ) ); // sweep
elements.add( new HLineTo( startX ) );
if( extraHeight > 0 ) {
/* The height of the input pins is larger than the height of
the shape so we need to add extra bar on top and bottom of
the shape.
*/
elements.add( new MoveTo( startX, 0 ) );
elements.add( new VLineTo( extraHeight + height ) );
}
else {
elements.add( new VLineTo( startY ) );
}
shape = new Path( elements );
shape.setStroke( getPenColor() );
shape.setStrokeWidth( getPenSize() );
shape.setStrokeLineJoin( StrokeLineJoin.ROUND );
shape.setStrokeLineCap( StrokeLineCap.ROUND );
shape.setFillRule( FillRule.NON_ZERO );
shape.setFill( getFillColor() );
return shape;
}
} // End: LogiGate
// SchematicView is the ScrollPane container that handles the events
public class SchematicView
extends ScrollPane {
/* Mouse handler inner class */
private class MouseEventHandler
implements EventHandler<MouseEvent> {
@Override
public void handle( MouseEvent event ) {
if( event.getEventType() == MouseEvent.MOUSE_CLICKED ) {
processMouseClicked( event );
}
else { /* ... more stuff ... */ }
}
private void processMouseClicked( MouseEvent event ) {
Object node = event.getSource();
SchematicSheet sheet = getSheet();
Bounds local = ( (Node) node ).getLayoutBounds();
Bounds local1 = ( (Node) node ).getBoundsInLocal();
Bounds parent = ( (Node) node ).getBoundsInParent();
// At this point, here is what I get:
// node.getHeight() = 10 -> Good
// local.getHeight() = 10 -> Good
// local1.getHeight() = 15.6499996... -> Not expected!
// parent.getHeight() = 15.6500015... -> Not expected!
/*... More stuff ... */
}
}
所以在这一点上，我正在查看正在发生的事情的线索。这些getBoundsInXXX()值来自哪里？它们也与父母的比例值不匹配。与getWidth()一样：我得到24.825000 ......而不是16。
看看这个，我理解为什么在组件外部点击就像我点击它一样。它的界限比它应该的大约50％。
我用谷歌搜索该死的东西，现在搜索一些文档差不多2天了，我仍然感到困惑。我想我明白getBoundsInXXX()方法可以做自己的计算，但可能会被这么多吗？我不是这样的。我最好的猜测是它是createShape()方法中的内容，但我无法弄清楚它是什么。
任何人都知道发生了什么？
非常感谢您的帮助。
P.S。：这是我在这里的第一篇文章，所以希望我做对了;）
我想我终于找到了问题:)
基本上，Pin自定义形状是在X轴的负面部分绘制的（错误的计算，我的坏！）。我最好的猜测是，不知何故，Java注意到我超出了标准边界，然后添加了用于边界的额外空间，因此，增加了50％的宽度，这与Pin的长度相匹配。在正面区域绘制似乎已经解决了问题。
我不是百分之百确定这是否是正确答案，但它是有道理的，它现在正在发挥作用。