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/*
* Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javafx.scene.shape;
import com.sun.javafx.geom.BaseBounds;
import com.sun.javafx.geom.Line2D;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.scene.NodeHelper;
import com.sun.javafx.scene.shape.LineHelper;
import com.sun.javafx.sg.prism.NGLine;
import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.sg.prism.NGShape;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.DoublePropertyBase;
import javafx.css.StyleableProperty;
import javafx.scene.Node;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
/**
* This Line represents a line segment in {@code (x,y)}
* coordinate space. Example:
*
import javafx.scene.shape.*;
Line line = new Line();
line.setStartX(0.0f);
line.setStartY(0.0f);
line.setEndX(100.0f);
line.setEndY(100.0f);
}
* @since JavaFX 2.0
*/
public class Line extends Shape {
static {
LineHelper.setLineAccessor(new LineHelper.LineAccessor() {
@Override
public NGNode doCreatePeer(Node node) {
return ((Line) node).doCreatePeer();
}
@Override
public void doUpdatePeer(Node node) {
((Line) node).doUpdatePeer();
}
@Override
public BaseBounds doComputeGeomBounds(Node node,
BaseBounds bounds, BaseTransform tx) {
return ((Line) node).doComputeGeomBounds(bounds, tx);
}
@Override
public Paint doCssGetFillInitialValue(Shape shape) {
return ((Line) shape).doCssGetFillInitialValue();
}
@Override
public Paint doCssGetStrokeInitialValue(Shape shape) {
return ((Line) shape).doCssGetStrokeInitialValue();
}
@Override
public com.sun.javafx.geom.Shape doConfigShape(Shape shape) {
return ((Line) shape).doConfigShape();
}
});
}
private final Line2D shape = new Line2D();
{
// To initialize the class helper at the begining each constructor of this class
LineHelper.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 Line.
*/
public Line() {
}
/**
* Creates a new instance of Line.
* @param startX the horizontal coordinate of the start point of the line segment
* @param startY the vertical coordinate of the start point of the line segment
* @param endX the horizontal coordinate of the end point of the line segment
* @param endY the vertical coordinate of the end point of the line segment
*/
public Line(double startX, double startY, double endX, double endY) {
setStartX(startX);
setStartY(startY);
setEndX(endX);
setEndY(endY);
}
/**
* The X coordinate of the start point of the line segment.
*
* @defaultValue 0.0
*/
private final DoubleProperty startX = new DoublePropertyBase() {
@Override
public void invalidated() {
NodeHelper.markDirty(Line.this, DirtyBits.NODE_GEOMETRY);
NodeHelper.geomChanged(Line.this);
}
@Override
public Object getBean() {
return Line.this;
}
@Override
public String getName() {
return "startX";
}
};
public final void setStartX(double value) {
startX.set(value);
}
public final double getStartX() {
return startX.get();
}
public final DoubleProperty startXProperty() {
return startX;
}
/**
* The Y coordinate of the start point of the line segment.
*
* @defaultValue 0.0
*/
private final DoubleProperty startY = new DoublePropertyBase() {
@Override
public void invalidated() {
NodeHelper.markDirty(Line.this, DirtyBits.NODE_GEOMETRY);
NodeHelper.geomChanged(Line.this);
}
@Override
public Object getBean() {
return Line.this;
}
@Override
public String getName() {
return "startY";
}
};
public final void setStartY(double value) {
startY.set(value);
}
public final double getStartY() {
return startY.get();
}
public final DoubleProperty startYProperty() {
return startY;
}
/**
* The X coordinate of the end point of the line segment.
*
* @defaultValue 0.0
*/
private final DoubleProperty endX = new DoublePropertyBase() {
@Override
public void invalidated() {
NodeHelper.markDirty(Line.this, DirtyBits.NODE_GEOMETRY);
NodeHelper.geomChanged(Line.this);
}
@Override
public Object getBean() {
return Line.this;
}
@Override
public String getName() {
return "endX";
}
};
public final void setEndX(double value) {
endX.set(value);
}
public final double getEndX() {
return endX.get();
}
public final DoubleProperty endXProperty() {
return endX;
}
/**
* The Y coordinate of the end point of the line segment.
*
* @defaultValue 0.0
*/
private final DoubleProperty endY = new DoublePropertyBase() {
@Override
public void invalidated() {
NodeHelper.markDirty(Line.this, DirtyBits.NODE_GEOMETRY);
NodeHelper.geomChanged(Line.this);
}
@Override
public Object getBean() {
return Line.this;
}
@Override
public String getName() {
return "endY";
}
};
public final void setEndY(double value) {
endY.set(value);
}
public final double getEndY() {
return endY.get();
}
public final DoubleProperty endYProperty() {
return endY;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private NGNode doCreatePeer() {
return new NGLine();
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private BaseBounds doComputeGeomBounds(BaseBounds bounds, BaseTransform tx) {
// Since line's only draw with strokes, if the mode is FILL or EMPTY
// then we simply return empty bounds
if (getMode() == NGShape.Mode.FILL || getMode() == NGShape.Mode.EMPTY ||
getStrokeType() == StrokeType.INSIDE)
{
return bounds.makeEmpty();
}
double x1 = getStartX();
double x2 = getEndX();
double y1 = getStartY();
double y2 = getEndY();
// Get the draw stroke, and figure out the bounds based on the stroke.
double wpad = getStrokeWidth();
if (getStrokeType() == StrokeType.CENTERED) {
wpad /= 2.0f;
}
// fast path the case of AffineTransform being TRANSLATE or identity
if (tx.isTranslateOrIdentity()) {
final double xpad;
final double ypad;
wpad = Math.max(wpad, 0.5f);
if (tx.getType() == BaseTransform.TYPE_TRANSLATION) {
final double ddx = tx.getMxt();
final double ddy = tx.getMyt();
x1 += ddx;
y1 += ddy;
x2 += ddx;
y2 += ddy;
}
if (y1 == y2 && x1 != x2) {
ypad = wpad;
xpad = (getStrokeLineCap() == StrokeLineCap.BUTT) ? 0.0f : wpad;
} else if (x1 == x2 && y1 != y2) {
xpad = wpad;
ypad = (getStrokeLineCap() == StrokeLineCap.BUTT) ? 0.0f : wpad;
} else {
if (getStrokeLineCap() == StrokeLineCap.SQUARE) {
wpad *= Math.sqrt(2);
}
xpad = ypad = wpad;
}
if (x1 > x2) { final double t = x1; x1 = x2; x2 = t; }
if (y1 > y2) { final double t = y1; y1 = y2; y2 = t; }
x1 -= xpad;
y1 -= ypad;
x2 += xpad;
y2 += ypad;
bounds = bounds.deriveWithNewBounds((float)x1, (float)y1, 0.0f,
(float)x2, (float)y2, 0.0f);
return bounds;
}
double dx = x2 - x1;
double dy = y2 - y1;
final double len = Math.sqrt(dx * dx + dy * dy);
if (len == 0.0f) {
dx = wpad;
dy = 0.0f;
} else {
dx = wpad * dx / len;
dy = wpad * dy / len;
}
final double ecx;
final double ecy;
if (getStrokeLineCap() != StrokeLineCap.BUTT) {
ecx = dx;
ecy = dy;
} else {
ecx = ecy = 0.0f;
}
final double corners[] = new double[] {
x1-dy-ecx, y1+dx-ecy,
x1+dy-ecx, y1-dx-ecy,
x2+dy+ecx, y2-dx+ecy,
x2-dy+ecx, y2+dx+ecy };
tx.transform(corners, 0, corners, 0, 4);
x1 = Math.min(Math.min(corners[0], corners[2]),
Math.min(corners[4], corners[6]));
y1 = Math.min(Math.min(corners[1], corners[3]),
Math.min(corners[5], corners[7]));
x2 = Math.max(Math.max(corners[0], corners[2]),
Math.max(corners[4], corners[6]));
y2 = Math.max(Math.max(corners[1], corners[3]),
Math.max(corners[5], corners[7]));
x1 -= 0.5f;
y1 -= 0.5f;
x2 += 0.5f;
y2 += 0.5f;
bounds = bounds.deriveWithNewBounds((float)x1, (float)y1, 0.0f,
(float)x2, (float)y2, 0.0f);
return bounds;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private Line2D doConfigShape() {
shape.setLine((float)getStartX(), (float)getStartY(), (float)getEndX(), (float)getEndY());
return shape;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private void doUpdatePeer() {
if (NodeHelper.isDirty(this, DirtyBits.NODE_GEOMETRY)) {
NGLine peer = NodeHelper.getPeer(this);
peer.updateLine((float)getStartX(),
(float)getStartY(),
(float)getEndX(),
(float)getEndY());
}
}
/***************************************************************************
* *
* 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 Line} object.
* @return a string representation of this {@code Line} object.
*/
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("Line[");
String id = getId();
if (id != null) {
sb.append("id=").append(id).append(", ");
}
sb.append("startX=").append(getStartX());
sb.append(", startY=").append(getStartY());
sb.append(", endX=").append(getEndX());
sb.append(", endY=").append(getEndY());
Paint stroke = getStroke();
if (stroke != null) {
sb.append(", stroke=").append(stroke);
sb.append(", strokeWidth=").append(getStrokeWidth());
}
return sb.append("]").toString();
}
}
