Test if two rectangles intersect. - Java java.lang

Java examples for java.lang:Math Geometry Shape

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Description

Test if two rectangles intersect.

Demo Code


//package com.java2s;
import java.awt.geom.*;

public class Main {
    /**/*from   ww w  .  j a  v a2  s  .c om*/
     * Test if two rectangles intersect. <br>
     * This test differs from Rectangle2D.intersects()in that it returns also true
     * if one of the rectangles has an height or a width that equals 0.
     * @param r1 Rectangle 1
     * @param r2 Rectangle 2.
     * @return true if the two rectangles intersect, false if the rectangles do
     * not intersect or if they are identical.
     */
    public static boolean rectanglesIntersect(Rectangle2D r1, Rectangle2D r2) {
        if (r1 == null || r2 == null) {
            return false;
        }

        final double xmin1 = r1.getMinX();
        final double xmax1 = r1.getMaxX();
        final double xmin2 = r2.getMinX();
        final double xmax2 = r2.getMaxX();

        final double xmin = xmin1 > xmin2 ? xmin1 : xmin2;
        final double xmax = xmax1 < xmax2 ? xmax1 : xmax2;
        if (xmin > xmax) {
            return false;
        }

        final double ymin1 = r1.getMinY();
        final double ymax1 = r1.getMaxY();
        final double ymin2 = r2.getMinY();
        final double ymax2 = r2.getMaxY();

        // test if rectangles are identical
        if (ymin1 == ymin2 && xmin1 == xmin2) {
            return false;
        }

        final double ymin = ymin1 > ymin2 ? ymin1 : ymin2;
        final double ymax = ymax1 < ymax2 ? ymax1 : ymax2;
        return (ymin <= ymax);
    }
}

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