org.scijava.util.RealRect Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of scijava-common Show documentation
Show all versions of scijava-common Show documentation
SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2016 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
* %%
* 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;
}
}