circle Rect Collision - Java java.lang

Java examples for java.lang:Math Geometry Shape

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Description

circle Rect Collision

Demo Code

/*//from w ww.  ja  v a2  s .co  m
 * Copyright (c) 2003-onwards Shaven Puppy Ltd
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * 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.
 *
 * * Neither the name of 'Shaven Puppy' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * 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 OWNER 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.
 */
//package com.java2s;

public class Main {
    public static boolean circleRectCollision(float x, float y,
            float radius, float rx, float ry, float width, float height) {
        // 1. Corners in circle?
        if (pointInCircle(x, y, radius, rx, ry)) {
            return true;
        }
        if (pointInCircle(x, y, radius, rx + width, ry)) {
            return true;
        }
        if (pointInCircle(x, y, radius, rx + width, ry + height)) {
            return true;
        }
        if (pointInCircle(x, y, radius, rx, ry + height)) {
            return true;
        }

        // 2. Edge in circle?
        if (x >= rx && x < rx + width) {
            if (Math.abs(ry - y) < radius) {
                return true;
            }
            if (Math.abs(y - (ry + height)) < radius) {
                return true;
            }
        } else if (y >= ry && y < ry + height) {
            if (Math.abs(rx - x) < radius) {
                return true;
            }
            if (Math.abs(x - (rx + width)) < radius) {
                return true;
            }
        }

        // 3. Wholly contained?
        return x >= rx + radius && y >= ry + radius
                && x < rx + width - radius && y < ry + height - radius;

    }

    public static boolean pointInCircle(float x, float y, float radius,
            float px, float py) {
        float dx = px - x;
        float dy = py - y;
        return Math.sqrt(dx * dx + dy * dy) < radius;
    }
}

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