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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.
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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;
}
}