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/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2023 SciJava developers.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
package org.scijava.util;
/**
* A class for representing a rectangular region, in real coordinates.
*
* @author Barry DeZonia
* @author Curtis Rueden
*/
public class RealRect {
// -- Fields --
public double x;
public double y;
public double width;
public double height;
// -- Constructor --
public RealRect() {
// default constructor - allow all instance vars to be initialized to 0
}
public RealRect(final double x, final double y, final double width,
final double height)
{
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
// -- RealRect methods --
/** Returns true if this rect intersects the given rect. */
public boolean intersects(final RealRect r) {
double tw = this.width;
double th = this.height;
double rw = r.width;
double rh = r.height;
if (rw <= 0 || rh <= 0 || tw <= 0 || th <= 0) {
return false;
}
final double tx = this.x;
final double ty = this.y;
final double rx = r.x;
final double ry = r.y;
rw += rx;
rh += ry;
tw += tx;
th += ty;
final boolean rtn =
(rw < rx || rw > tx) && (rh < ry || rh > ty) && (tw < tx || tw > rx) &&
(th < ty || th > ry);
return rtn;
}
/**
* Returns a Rect representing the intersection of this Rect with the given
* Rect. If the two Rects do not intersect, the result is an empty Rect.
*/
public RealRect intersection(final RealRect r) {
final double newX = Math.max(this.x, r.x);
final double newY = Math.max(this.y, r.y);
double newW = Math.min(this.x + this.width, r.x + r.width) - x;
double newH = Math.min(this.y + this.height, r.y + r.height) - y;
if (newW < 0) newW = 0;
if (newH < 0) newH = 0;
return new RealRect(newX, newY, newW, newH);
}
/** Tests whether the given coordinates lie within the rectangle. */
public boolean contains(final RealCoords coords) {
return coords.x >= this.x && coords.x < this.x + this.width &&
coords.y >= this.y && coords.y < this.y + this.height;
}
/** Gets the top left coordinate of the rectangle. */
public RealCoords getTopLeft() {
return new RealCoords(x, y);
}
/** Gets the bottom right coordinate of the rectangle. */
public RealCoords getBottomRight() {
return new RealCoords(x + width, y + height);
}
// -- Object methods --
@Override
public String toString() {
return "x=" + x + ", y=" + y + ", w=" + width + ", h=" + height;
}
@Override
public boolean equals(final Object o) {
if (!(o instanceof RealRect)) return false;
final RealRect rect = (RealRect) o;
return x == rect.x && y == rect.y && width == rect.width &&
height == rect.height;
}
@Override
public int hashCode() {
// combine 8 least significant bits of x, y, width and height
final int b1 = lsb(x);
final int b2 = lsb(y);
final int b3 = lsb(width);
final int b4 = lsb(height);
return b1 | (b2 << 8) | (b3 << 16) | (b4 << 24);
}
// -- Helper methods --
private int lsb(final double d) {
return (int) Double.doubleToLongBits(d) & 0xff;
}
}