/*
* Copyright 2009 Hao Nguyen
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package gwt.g2d.shared.math;
import gwt.g2d.shared.math.Vector2;
import java.io.Serializable;
import java.util.Arrays;
/**
* Represents a rectangle.
*
* @author hao1300@gmail.com
*/
public class Rectangle implements Serializable {
/** An empty rectangle. */
public static final Rectangle EMPTY_RECTANGLE = new ImmutableRectangle(0, 0, 0, 0);
private static final long serialVersionUID = 8819333315393490701L;
public double x, y, width, height;
public Rectangle() {
}
public Rectangle(Rectangle rhs) {
this(rhs.getX(), rhs.getY(), rhs.getWidth(), rhs.getHeight());
}
public Rectangle(Vector2 position, double width, double height) {
this(position.getX(), position.getY(), width, height);
}
public Rectangle(double x, double y, double width, double height) {
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
/**
* Creates a rectangle at the given center.
*
* @param x x-coordinate of the center of the rectangle.
* @param y y-coordinate of the center of the rectangle.
* @param halfWidth half the width of the rectangle.
* @param halfHeight half the height of the rectangle.
* @return the rectangle created.
*/
public static final Rectangle createAtCenter(double x, double y, double halfWidth,
double halfHeight) {
return new Rectangle(x - halfWidth, y - halfHeight, x + halfWidth, y + halfHeight);
}
/**
* Creates a rectangle at the given center.
*
* @param center the center of the rectangle.
* @param halfWidth half the width of the rectangle.
* @param halfHeight half the height of the rectangle.
* @return the rectangle created.
*/
public static final Rectangle createAtCenter(Vector2 center, double halfWidth,
double halfHeight) {
return createAtCenter(center.getX(), center.getY(), halfWidth, halfHeight);
}
/**
* Gets the top-left x-coordinate of the rectangle.
*/
public final double getX() {
return x;
}
/**
* Sets the top-left x-coordinate of the rectangle.
*/
public void setX(double x) {
this.x = x;
}
/**
* Gets the top-left y-coordinate of the rectangle.
*/
public final double getY() {
return y;
}
/**
* Sets the top-left y-coordinate of the rectangle.
*/
public void setY(double y) {
this.y = y;
}
/**
* Gets the width of the rectangle.
*/
public final double getWidth() {
return width;
}
/**
* Sets the width of the rectangle.
*/
public void setWidth(double width) {
this.width = width;
}
/**
* Gets the height of the rectangle.
*/
public double getHeight() {
return height;
}
/**
* Sets the height of the rectangle.
*/
public void setHeight(double height) {
this.height = height;
}
/**
* Get the location.
*/
public Vector2 getLoc() {
return new Vector2(x,y);
}
/**
* Get the size.
*/
public Vector2 getSize() {
return new Vector2(width, height);
}
/**
* Moves the top left corner of this rectangle to (x, y).
*
* @param x
* @param y
*/
public final void move(double x, double y) {
setX(x);
setY(y);
}
/**
* Moves the top left corner of this rectangle to the given position.
*
* @param position the position to move the rectangle to.
*/
public final void move(Vector2 position) {
move(position.getX(), position.getY());
}
@Override
public final boolean equals(Object obj) {
return (obj instanceof Rectangle) ? equals((Rectangle) obj) : false;
}
public final boolean equals(Rectangle rhs) {
return getX() == rhs.getX() && getY() == rhs.getY() && getWidth() == rhs.getWidth()
&& getHeight() == rhs.getHeight();
}
@Override
public final int hashCode() {
return Arrays.hashCode(new double[]{getX(), getY(), getWidth(), getHeight()});
}
@Override
public String toString() {
return "[[" + getX() + ", " + getY() + "], [" + getWidth() + ", " + getHeight() + "]]";
}
/**
* An immutable rectangle.
*/
private static class ImmutableRectangle extends Rectangle {
private static final long serialVersionUID = 7659507627055283854L;
private static final String MODIFICATION_ERROR_MESSAGE =
"Cannot modify an immutable rectangle";
public ImmutableRectangle(double x, double y, double width, double height) {
super(x, y, width, height);
}
@Override
public void setX(double arg0) {
throw new UnsupportedOperationException(MODIFICATION_ERROR_MESSAGE);
}
@Override
public void setY(double arg0) {
throw new UnsupportedOperationException(MODIFICATION_ERROR_MESSAGE);
}
@Override
public void setWidth(double arg0) {
throw new UnsupportedOperationException(MODIFICATION_ERROR_MESSAGE);
}
@Override
public void setHeight(double arg0) {
throw new UnsupportedOperationException(MODIFICATION_ERROR_MESSAGE);
}
}
}