javafx.scene.shape.Path Maven / Gradle / Ivy
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package javafx.scene.shape;
import com.sun.javafx.collections.TrackableObservableList;
import com.sun.javafx.geom.Path2D;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.scene.NodeHelper;
import com.sun.javafx.scene.shape.PathElementHelper;
import com.sun.javafx.scene.shape.PathHelper;
import com.sun.javafx.scene.shape.PathUtils;
import com.sun.javafx.scene.shape.ShapeHelper;
import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.sg.prism.NGPath;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ObjectPropertyBase;
import javafx.collections.ListChangeListener.Change;
import javafx.collections.ObservableList;
import javafx.css.StyleableProperty;
import javafx.geometry.BoundingBox;
import javafx.geometry.Bounds;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import java.util.Collection;
import java.util.List;
import javafx.scene.Node;
/**
* The {@code Path} class represents a simple shape
* and provides facilities required for basic construction
* and management of a geometric path. Example:
*
import javafx.scene.shape.*;
Path path = new Path();
MoveTo moveTo = new MoveTo();
moveTo.setX(0.0f);
moveTo.setY(0.0f);
HLineTo hLineTo = new HLineTo();
hLineTo.setX(70.0f);
QuadCurveTo quadCurveTo = new QuadCurveTo();
quadCurveTo.setX(120.0f);
quadCurveTo.setY(60.0f);
quadCurveTo.setControlX(100.0f);
quadCurveTo.setControlY(0.0f);
LineTo lineTo = new LineTo();
lineTo.setX(175.0f);
lineTo.setY(55.0f);
ArcTo arcTo = new ArcTo();
arcTo.setX(50.0f);
arcTo.setY(50.0f);
arcTo.setRadiusX(50.0f);
arcTo.setRadiusY(50.0f);
path.getElements().add(moveTo);
path.getElements().add(hLineTo);
path.getElements().add(quadCurveTo);
path.getElements().add(lineTo);
path.getElements().add(arcTo);
* @since JavaFX 2.0
*/
public class Path extends Shape {
static {
PathHelper.setPathAccessor(new PathHelper.PathAccessor() {
@Override
public NGNode doCreatePeer(Node node) {
return ((Path) node).doCreatePeer();
}
@Override
public void doUpdatePeer(Node node) {
((Path) node).doUpdatePeer();
}
@Override
public Bounds doComputeLayoutBounds(Node node) {
return ((Path) node).doComputeLayoutBounds();
}
@Override
public Paint doCssGetFillInitialValue(Shape shape) {
return ((Path) shape).doCssGetFillInitialValue();
}
@Override
public Paint doCssGetStrokeInitialValue(Shape shape) {
return ((Path) shape).doCssGetStrokeInitialValue();
}
@Override
public com.sun.javafx.geom.Shape doConfigShape(Shape shape) {
return ((Path) shape).doConfigShape();
}
});
}
private Path2D path2d = null;
{
// To initialize the class helper at the begining each constructor of this class
PathHelper.initHelper(this);
// overriding default values for fill and stroke
// Set through CSS property so that it appears to be a UA style rather
// that a USER style so that fill and stroke can still be set from CSS.
((StyleableProperty)fillProperty()).applyStyle(null, null);
((StyleableProperty)strokeProperty()).applyStyle(null, Color.BLACK);
}
/**
* Creates an empty instance of Path.
*/
public Path() {
}
/**
* Creates a new instance of Path
* @param elements Elements of the Path
* @since JavaFX 2.1
*/
public Path(PathElement... elements) {
if (elements != null) {
this.elements.addAll(elements);
}
}
/**
* Creates new instance of Path
* @param elements The collection of the elements of the Path
* @since JavaFX 2.2
*/
public Path(Collection elements) {
if (elements != null) {
this.elements.addAll(elements);
}
}
void markPathDirty() {
path2d = null;
NodeHelper.markDirty(this, DirtyBits.NODE_CONTENTS);
NodeHelper.geomChanged(this);
}
/**
* Defines the filling rule constant for determining the interior of the path.
* The value must be one of the following constants:
* {@code FillRile.EVEN_ODD} or {@code FillRule.NON_ZERO}.
* The default value is {@code FillRule.NON_ZERO}.
*
* @defaultValue FillRule.NON_ZERO
*/
private ObjectProperty fillRule;
public final void setFillRule(FillRule value) {
if (fillRule != null || value != FillRule.NON_ZERO) {
fillRuleProperty().set(value);
}
}
public final FillRule getFillRule() {
return fillRule == null ? FillRule.NON_ZERO : fillRule.get();
}
public final ObjectProperty fillRuleProperty() {
if (fillRule == null) {
fillRule = new ObjectPropertyBase(FillRule.NON_ZERO) {
@Override
public void invalidated() {
NodeHelper.markDirty(Path.this, DirtyBits.NODE_CONTENTS);
NodeHelper.geomChanged(Path.this);
}
@Override
public Object getBean() {
return Path.this;
}
@Override
public String getName() {
return "fillRule";
}
};
}
return fillRule;
}
private boolean isPathValid;
/**
* Defines the array of path elements of this path.
*
* @defaultValue empty
*/
private final ObservableList elements = new TrackableObservableList() {
@Override
protected void onChanged(Change c) {
List list = c.getList();
boolean firstElementChanged = false;
while (c.next()) {
List removed = c.getRemoved();
for (int i = 0; i < c.getRemovedSize(); ++i) {
removed.get(i).removeNode(Path.this);
}
for (int i = c.getFrom(); i < c.getTo(); ++i) {
list.get(i).addNode(Path.this);
}
firstElementChanged |= c.getFrom() == 0;
}
//Note: as ArcTo may create a various number of PathElements,
// we cannot count the number of PathElements removed (fast enough).
// Thus we can optimize only if some elements were added to the end
if (path2d != null) {
c.reset();
c.next();
// we just have to check the first change, as more changes cannot come after such change
if (c.getFrom() == c.getList().size() && !c.wasRemoved() && c.wasAdded()) {
// some elements added
for (int i = c.getFrom(); i < c.getTo(); ++i) {
PathElementHelper.addTo(list.get(i), path2d);
}
} else {
path2d = null;
}
}
if (firstElementChanged) {
isPathValid = isFirstPathElementValid();
}
NodeHelper.markDirty(Path.this, DirtyBits.NODE_CONTENTS);
NodeHelper.geomChanged(Path.this);
}
};
/**
* Gets observable list of path elements of this path.
* @return Elements of this path
*/
public final ObservableList getElements() { return elements; }
/*
* Note: This method MUST only be called via its accessor method.
*/
private NGNode doCreatePeer() {
return new NGPath();
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private Path2D doConfigShape() {
if (isPathValid) {
if (path2d == null) {
path2d = PathUtils.configShape(getElements(), getFillRule() == FillRule.EVEN_ODD);
} else {
path2d.setWindingRule(getFillRule() == FillRule.NON_ZERO ?
Path2D.WIND_NON_ZERO : Path2D.WIND_EVEN_ODD);
}
return path2d;
} else {
return new Path2D();
}
}
private Bounds doComputeLayoutBounds() {
if (isPathValid) {
return null; // Helper will need to call its super's compute layout bounds
}
return new BoundingBox(0, 0, -1, -1); //create empty bounds
}
private boolean isFirstPathElementValid() {
ObservableList _elements = getElements();
if (_elements != null && _elements.size() > 0) {
PathElement firstElement = _elements.get(0);
if (!firstElement.isAbsolute()) {
System.err.printf("First element of the path can not be relative. Path: %s\n", this);
return false;
} else if (firstElement instanceof MoveTo) {
return true;
} else {
System.err.printf("Missing initial moveto in path definition. Path: %s\n", this);
return false;
}
}
return true;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private void doUpdatePeer() {
if (NodeHelper.isDirty(this, DirtyBits.NODE_CONTENTS)) {
NGPath peer = NodeHelper.getPeer(this);
if (peer.acceptsPath2dOnUpdate()) {
peer.updateWithPath2d((Path2D) ShapeHelper.configShape(this));
} else {
peer.reset();
if (isPathValid) {
peer.setFillRule(getFillRule());
for (final PathElement elt : getElements()) {
elt.addTo(peer);
}
peer.update();
}
}
}
}
/* *************************************************************************
* *
* Stylesheet Handling *
* *
**************************************************************************/
/*
* Some sub-class of Shape, such as {@link Line}, override the
* default value for the {@link Shape#fill} property. This allows
* CSS to get the correct initial value.
*
* Note: This method MUST only be called via its accessor method.
*/
private Paint doCssGetFillInitialValue() {
return null;
}
/*
* Some sub-class of Shape, such as {@link Line}, override the
* default value for the {@link Shape#stroke} property. This allows
* CSS to get the correct initial value.
*
* Note: This method MUST only be called via its accessor method.
*/
private Paint doCssGetStrokeInitialValue() {
return Color.BLACK;
}
/**
* Returns a string representation of this {@code Path} object.
* @return a string representation of this {@code Path} object.
*/
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("Path[");
String id = getId();
if (id != null) {
sb.append("id=").append(id).append(", ");
}
sb.append("elements=").append(getElements());
sb.append(", fill=").append(getFill());
sb.append(", fillRule=").append(getFillRule());
Paint stroke = getStroke();
if (stroke != null) {
sb.append(", stroke=").append(stroke);
sb.append(", strokeWidth=").append(getStrokeWidth());
}
return sb.append("]").toString();
}
}
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