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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;
	}

}