| /******************************************************************************* |
| * Copyright (c) 2014 Dirk Fauth, Edwin Park. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Dirk Fauth <dirk.fauth@googlemail.com> - initial API and implementation |
| * Edwin Park <esp1@cornell.edu> - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.nebula.widgets.nattable.core.geometry; |
| |
| /** |
| * Instances of this class represent rectangular areas in an (x, y) coordinate |
| * system. The top left corner of the rectangle is specified by its x and y |
| * values, and the extent of the rectangle is specified by its width and height. |
| * The values are stored as double values because newer UI toolkits use doubles |
| * to identify coordinates to support scaling. |
| * <p> |
| * There might be an implementation for this in every UI toolkit, like |
| * org.eclipse.swt.graphics.Rectangle or java.awt.Rectangle, but they are |
| * dependent to the UI toolkit because of their package and inheritance. That's |
| * why we re-implemented it again to make use of it in NatTable core without any |
| * further dependencies. |
| * </p> |
| */ |
| public class PixelRectangle { |
| |
| /** |
| * the x coordinate of the rectangle |
| */ |
| public double x; |
| |
| /** |
| * the y coordinate of the rectangle |
| */ |
| public double y; |
| |
| /** |
| * the width of the rectangle |
| */ |
| public double width; |
| |
| /** |
| * the height of the rectangle |
| */ |
| public double height; |
| |
| /** |
| * Construct a new instance of this class given the x, y, width and height |
| * values. |
| * |
| * @param x |
| * the x coordinate of the origin of the rectangle |
| * @param y |
| * the y coordinate of the origin of the rectangle |
| * @param width |
| * the width of the rectangle |
| * @param height |
| * the height of the rectangle |
| */ |
| public PixelRectangle(double x, double y, double width, double height) { |
| this.x = x; |
| this.y = y; |
| this.width = width; |
| this.height = height; |
| } |
| |
| /** |
| * Destructively replaces the x, y, width and height values in the receiver |
| * with ones which represent the union of the rectangles specified by the |
| * receiver and the given rectangle. |
| * <p> |
| * The union of two rectangles is the smallest single rectangle that |
| * completely covers both of the areas covered by the two given rectangles. |
| * </p> |
| * |
| * @param rect |
| * the rectangle to merge with the receiver |
| * |
| * @throws IllegalArgumentException |
| * if the specified rectangle is <code>null</code> |
| */ |
| public void add(PixelRectangle rect) { |
| if (rect == null) |
| throw new IllegalArgumentException("rectangle can not be null"); //$NON-NLS-1$ |
| double left = this.x < rect.x ? this.x : rect.x; |
| double top = this.y < rect.y ? this.y : rect.y; |
| double lhs = this.x + this.width; |
| double rhs = rect.x + rect.width; |
| double right = lhs > rhs ? lhs : rhs; |
| lhs = this.y + this.height; |
| rhs = rect.y + rect.height; |
| double bottom = lhs > rhs ? lhs : rhs; |
| this.x = left; |
| this.y = top; |
| this.width = right - left; |
| this.height = bottom - top; |
| } |
| |
| /** |
| * Returns <code>true</code> if the point specified by the arguments is |
| * inside the area specified by the receiver, and <code>false</code> |
| * otherwise. |
| * |
| * @param x |
| * the x coordinate of the point to test for containment |
| * @param y |
| * the y coordinate of the point to test for containment |
| * @return <code>true</code> if the rectangle contains the point and |
| * <code>false</code> otherwise |
| */ |
| public boolean contains(double x, double y) { |
| return (x >= this.x) && (y >= this.y) && x < (this.x + this.width) && y < (this.y + this.height); |
| } |
| |
| /** |
| * Returns <code>true</code> if the given pixel coordinate is inside the |
| * area specified by the receiver, and <code>false</code> otherwise. |
| * |
| * @param pt |
| * the point to test for containment |
| * @return <code>true</code> if the rectangle contains the point and |
| * <code>false</code> otherwise |
| * |
| * @throws IllegalArgumentException |
| * if the specified point is <code>null</code> |
| */ |
| public boolean contains(PixelCoordinate pt) { |
| if (pt == null) |
| throw new IllegalArgumentException("pixel coordinate can not be null"); //$NON-NLS-1$ |
| return contains(pt.x, pt.y); |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver does not cover any area in the |
| * (x, y) coordinate plane, and <code>false</code> if the receiver does |
| * cover some area in the plane. |
| * <p> |
| * A rectangle is considered to <em>cover area</em> in the (x, y) coordinate |
| * plane if both its width and height are non-zero. |
| * </p> |
| * |
| * @return <code>true</code> if the receiver is empty, and |
| * <code>false</code> otherwise |
| */ |
| public boolean isEmpty() { |
| return (this.width <= 0) || (this.height <= 0); |
| } |
| |
| /** |
| * Destructively replaces the x, y, width and height values in the receiver |
| * with ones which represent the intersection of the rectangles specified by |
| * the receiver and the given rectangle. |
| * |
| * @param rect |
| * the rectangle to intersect with the receiver |
| * |
| * @throws IllegalArgumentException |
| * if the specified rectangle is <code>null</code> |
| */ |
| public void intersect(PixelRectangle rect) { |
| if (rect == null) |
| throw new IllegalArgumentException("rectangle can not be null"); //$NON-NLS-1$ |
| if (this == rect) |
| return; |
| double left = this.x > rect.x ? this.x : rect.x; |
| double top = this.y > rect.y ? this.y : rect.y; |
| double lhs = this.x + this.width; |
| double rhs = rect.x + rect.width; |
| double right = lhs < rhs ? lhs : rhs; |
| lhs = this.y + this.height; |
| rhs = rect.y + rect.height; |
| double bottom = lhs < rhs ? lhs : rhs; |
| this.x = right < left ? 0 : left; |
| this.y = bottom < top ? 0 : top; |
| this.width = right < left ? 0 : right - left; |
| this.height = bottom < top ? 0 : bottom - top; |
| } |
| |
| /** |
| * Returns a new rectangle which represents the intersection of the receiver |
| * and the given rectangle. |
| * <p> |
| * The intersection of two rectangles is the rectangle that covers the area |
| * which is contained within both rectangles. |
| * </p> |
| * |
| * @param rect |
| * the rectangle to intersect with the receiver |
| * @return the intersection of the receiver and the argument |
| * |
| * @throws IllegalArgumentException |
| * if the specified rectangle is <code>null</code> |
| */ |
| public PixelRectangle intersection(PixelRectangle rect) { |
| if (rect == null) |
| throw new IllegalArgumentException("rectangle can not be null"); //$NON-NLS-1$ |
| if (this == rect) |
| return new PixelRectangle(this.x, this.y, this.width, this.height); |
| double left = this.x > rect.x ? this.x : rect.x; |
| double top = this.y > rect.y ? this.y : rect.y; |
| double lhs = this.x + this.width; |
| double rhs = rect.x + rect.width; |
| double right = lhs < rhs ? lhs : rhs; |
| lhs = this.y + this.height; |
| rhs = rect.y + rect.height; |
| double bottom = lhs < rhs ? lhs : rhs; |
| return new PixelRectangle( |
| right < left ? 0 : left, |
| bottom < top ? 0 : top, |
| right < left ? 0 : right - left, |
| bottom < top ? 0 : bottom - top); |
| } |
| |
| /** |
| * Returns <code>true</code> if the rectangle described by the arguments |
| * intersects with the receiver and <code>false</code> otherwise. |
| * <p> |
| * Two rectangles intersect if the area of the rectangle representing their |
| * intersection is not empty. |
| * </p> |
| * |
| * @param x |
| * the x coordinate of the origin of the rectangle |
| * @param y |
| * the y coordinate of the origin of the rectangle |
| * @param width |
| * the width of the rectangle |
| * @param height |
| * the height of the rectangle |
| * @return <code>true</code> if the rectangle intersects with the receiver, |
| * and <code>false</code> otherwise |
| * |
| * @see #intersection(PixelRectangle) |
| * @see #isEmpty() |
| */ |
| public boolean intersects(double x, double y, double width, double height) { |
| return (x < this.x + this.width) && (y < this.y + this.height) && |
| (x + width > this.x) && (y + height > this.y); |
| } |
| |
| /** |
| * Returns <code>true</code> if the given rectangle intersects with the |
| * receiver and <code>false</code> otherwise. |
| * <p> |
| * Two rectangles intersect if the area of the rectangle representing their |
| * intersection is not empty. |
| * </p> |
| * |
| * @param rect |
| * the rectangle to test for intersection |
| * @return <code>true</code> if the rectangle intersects with the receiver, |
| * and <code>false</code> otherwise |
| * |
| * @throws IllegalArgumentException |
| * if the specified rectangle is <code>null</code> |
| * |
| * @see #intersection(PixelRectangle) |
| * @see #isEmpty() |
| */ |
| public boolean intersects(PixelRectangle rect) { |
| if (rect == null) |
| throw new IllegalArgumentException("rectangle can not be null"); //$NON-NLS-1$ |
| return rect == this || intersects(rect.x, rect.y, rect.width, rect.height); |
| } |
| |
| /** |
| * Returns a new rectangle which represents the union of the receiver and |
| * the given rectangle. |
| * <p> |
| * The union of two rectangles is the smallest single rectangle that |
| * completely covers both of the areas covered by the two given rectangles. |
| * </p> |
| * |
| * @param rect |
| * the rectangle to perform union with |
| * @return the union of the receiver and the argument |
| * |
| * @throws IllegalArgumentException |
| * if the specified rectangle is <code>null</code> |
| * |
| * @see #add(PixelRectangle) |
| */ |
| public PixelRectangle union(PixelRectangle rect) { |
| if (rect == null) |
| throw new IllegalArgumentException("rectangle can not be null"); //$NON-NLS-1$ |
| double left = this.x < rect.x ? this.x : rect.x; |
| double top = this.y < rect.y ? this.y : rect.y; |
| double lhs = this.x + this.width; |
| double rhs = rect.x + rect.width; |
| double right = lhs > rhs ? lhs : rhs; |
| lhs = this.y + this.height; |
| rhs = rect.y + rect.height; |
| double bottom = lhs > rhs ? lhs : rhs; |
| return new PixelRectangle(left, top, right - left, bottom - top); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| long temp; |
| temp = Double.doubleToLongBits(this.height); |
| result = prime * result + (int) (temp ^ (temp >>> 32)); |
| temp = Double.doubleToLongBits(this.width); |
| result = prime * result + (int) (temp ^ (temp >>> 32)); |
| temp = Double.doubleToLongBits(this.x); |
| result = prime * result + (int) (temp ^ (temp >>> 32)); |
| temp = Double.doubleToLongBits(this.y); |
| result = prime * result + (int) (temp ^ (temp >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| PixelRectangle other = (PixelRectangle) obj; |
| if (Double.doubleToLongBits(this.height) != Double.doubleToLongBits(other.height)) |
| return false; |
| if (Double.doubleToLongBits(this.width) != Double.doubleToLongBits(other.width)) |
| return false; |
| if (Double.doubleToLongBits(this.x) != Double.doubleToLongBits(other.x)) |
| return false; |
| if (Double.doubleToLongBits(this.y) != Double.doubleToLongBits(other.y)) |
| return false; |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "PixelRectangle {" + this.x + ", " + this.y + ", " + this.width + ", " + this.height + "}"; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ |
| } |
| |
| } |
