tv_xiaoyouxi/games/symdsb/frameworks/cocos2d-html5/CCGeometry.js

/****************************************************************************
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2014 Chukong Technologies Inc.

 http://www.cocos2d-x.org

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 all copies or substantial portions of the Software.

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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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/**
 * cc.Point is the class for point object, please do not use its constructor to create points, use cc.p() alias function instead.
 * @class cc.Point
 * @param {Number} x
 * @param {Number} y
 * @see cc.p
 */
cc.Point = function (x, y) {
    this.x = x || 0;
    this.y = y || 0;
};

/**
 * Helper function that creates a cc.Point.
 * @function
 * @param {Number|cc.Point} x a Number or a size object
 * @param {Number} y
 * @return {cc.Point}
 * @example
 * var point1 = cc.p();
 * var point2 = cc.p(100, 100);
 * var point3 = cc.p(point2);
 * var point4 = cc.p({x: 100, y: 100});
 */
cc.p = function (x, y) {
    // This can actually make use of "hidden classes" in JITs and thus decrease
    // memory usage and overall performance drastically
    // return cc.p(x, y);
    // but this one will instead flood the heap with newly allocated hash maps
    // giving little room for optimization by the JIT,
    // note: we have tested this item on Chrome and firefox, it is faster than cc.p(x, y)
    if (x == undefined)
        return {x: 0, y: 0};
    if (y == undefined)
        return {x: x.x, y: x.y};
    return {x: x, y: y};
};

/**
 * Check whether a point's value equals to another
 * @function
 * @param {cc.Point} point1
 * @param {cc.Point} point2
 * @return {Boolean}
 */
cc.pointEqualToPoint = function (point1, point2) {
    return point1 && point2 && (point1.x === point2.x) && (point1.y === point2.y);
};


/**
 * cc.Size is the class for size object, please do not use its constructor to create sizes, use cc.size() alias function instead.
 * @class cc.Size
 * @param {Number} width
 * @param {Number} height
 * @see cc.size
 */
cc.Size = function (width, height) {
    this.width = width || 0;
    this.height = height || 0;
};

/**
 * Helper function that creates a cc.Size.
 * @function
 * @param {Number|cc.Size} w width or a size object
 * @param {Number} h height
 * @return {cc.Size}
 * @example
 * var size1 = cc.size();
 * var size2 = cc.size(100,100);
 * var size3 = cc.size(size2);
 * var size4 = cc.size({width: 100, height: 100});
 */
cc.size = function (w, h) {
    // This can actually make use of "hidden classes" in JITs and thus decrease
    // memory usage and overall performance drastically
    //return cc.size(w, h);
    // but this one will instead flood the heap with newly allocated hash maps
    // giving little room for optimization by the JIT
    // note: we have tested this item on Chrome and firefox, it is faster than cc.size(w, h)
    if (w === undefined)
        return {width: 0, height: 0};
    if (h === undefined)
        return {width: w.width, height: w.height};
    return {width: w, height: h};
};

/**
 * Check whether a point's value equals to another
 * @function
 * @param {cc.Size} size1
 * @param {cc.Size} size2
 * @return {Boolean}
 */
cc.sizeEqualToSize = function (size1, size2) {
    return (size1 && size2 && (size1.width == size2.width) && (size1.height == size2.height));
};


/**
 * cc.Rect is the class for rect object, please do not use its constructor to create rects, use cc.rect() alias function instead.
 * @class cc.Rect
 * @param {Number} width
 * @param {Number} height
 * @see cc.rect
 */
cc.Rect = function (x, y, width, height) {
    this.x = x||0;
    this.y = y||0;
    this.width = width||0;
    this.height = height||0;
};

/**
 * Helper function that creates a cc.Rect.
 * @function
 * @param {Number|cc.Rect} x a number or a rect object
 * @param {Number} y
 * @param {Number} w
 * @param {Number} h
 * @returns {cc.Rect}
 * @example
 * var rect1 = cc.rect();
 * var rect2 = cc.rect(100,100,100,100);
 * var rect3 = cc.rect(rect2);
 * var rect4 = cc.rect({x: 100, y: 100, width: 100, height: 100});
 */
cc.rect = function (x, y, w, h) {
    if (x === undefined)
        return {x: 0, y: 0, width: 0, height: 0};
    if (y === undefined)
        return {x: x.x, y: x.y, width: x.width, height: x.height};
    return {x: x, y: y, width: w, height: h };
};

/**
 * Check whether a rect's value equals to another
 * @function
 * @param {cc.Rect} rect1
 * @param {cc.Rect} rect2
 * @return {Boolean}
 */
cc.rectEqualToRect = function (rect1, rect2) {
    return rect1 && rect2 && (rect1.x === rect2.x) && (rect1.y === rect2.y) && (rect1.width === rect2.width) && (rect1.height === rect2.height);
};

cc._rectEqualToZero = function(rect){
    return rect && (rect.x === 0) && (rect.y === 0) && (rect.width === 0) && (rect.height === 0);
};

/**
 * Check whether the rect1 contains rect2
 * @function
 * @param {cc.Rect} rect1
 * @param {cc.Rect} rect2
 * @return {Boolean}
 */
cc.rectContainsRect = function (rect1, rect2) {
    if (!rect1 || !rect2)
        return false;
    return !((rect1.x >= rect2.x) || (rect1.y >= rect2.y) ||
        ( rect1.x + rect1.width <= rect2.x + rect2.width) ||
        ( rect1.y + rect1.height <= rect2.y + rect2.height));
};

/**
 * Returns the rightmost x-value of a rect
 * @function
 * @param {cc.Rect} rect
 * @return {Number} The rightmost x value
 */
cc.rectGetMaxX = function (rect) {
    return (rect.x + rect.width);
};

/**
 * Return the midpoint x-value of a rect
 * @function
 * @param {cc.Rect} rect
 * @return {Number} The midpoint x value
 */
cc.rectGetMidX = function (rect) {
    return (rect.x + rect.width / 2.0);
};
/**
 * Returns the leftmost x-value of a rect
 * @function
 * @param {cc.Rect} rect
 * @return {Number} The leftmost x value
 */
cc.rectGetMinX = function (rect) {
    return rect.x;
};

/**
 * Return the topmost y-value of a rect
 * @function
 * @param {cc.Rect} rect
 * @return {Number} The topmost y value
 */
cc.rectGetMaxY = function (rect) {
    return(rect.y + rect.height);
};

/**
 * Return the midpoint y-value of `rect'
 * @function
 * @param {cc.Rect} rect
 * @return {Number} The midpoint y value
 */
cc.rectGetMidY = function (rect) {
    return rect.y + rect.height / 2.0;
};

/**
 * Return the bottommost y-value of a rect
 * @function
 * @param {cc.Rect} rect
 * @return {Number} The bottommost y value
 */
cc.rectGetMinY = function (rect) {
    return rect.y;
};

/**
 * Check whether a rect contains a point
 * @function
 * @param {cc.Rect} rect
 * @param {cc.Point} point
 * @return {Boolean}
 */
cc.rectContainsPoint = function (rect, point) {
    return (point.x >= cc.rectGetMinX(rect) && point.x <= cc.rectGetMaxX(rect) &&
        point.y >= cc.rectGetMinY(rect) && point.y <= cc.rectGetMaxY(rect)) ;
};

/**
 * Check whether a rect intersect with another
 * @function
 * @param {cc.Rect} rectA
 * @param {cc.Rect} rectB
 * @return {Boolean}
 */
cc.rectIntersectsRect = function (ra, rb) {
    var maxax = ra.x + ra.width,
        maxay = ra.y + ra.height,
        maxbx = rb.x + rb.width,
        maxby = rb.y + rb.height;
    return !(maxax < rb.x || maxbx < ra.x || maxay < rb.y || maxby < ra.y);
};

/**
 * Check whether a rect overlaps another
 * @function
 * @param {cc.Rect} rectA
 * @param {cc.Rect} rectB
 * @return {Boolean}
 */
cc.rectOverlapsRect = function (rectA, rectB) {
    return !((rectA.x + rectA.width < rectB.x) ||
        (rectB.x + rectB.width < rectA.x) ||
        (rectA.y + rectA.height < rectB.y) ||
        (rectB.y + rectB.height < rectA.y));
};

/**
 * Returns the smallest rectangle that contains the two source rectangles.
 * @function
 * @param {cc.Rect} rectA
 * @param {cc.Rect} rectB
 * @return {cc.Rect}
 */
cc.rectUnion = function (rectA, rectB) {
    var rect = cc.rect(0, 0, 0, 0);
    rect.x = Math.min(rectA.x, rectB.x);
    rect.y = Math.min(rectA.y, rectB.y);
    rect.width = Math.max(rectA.x + rectA.width, rectB.x + rectB.width) - rect.x;
    rect.height = Math.max(rectA.y + rectA.height, rectB.y + rectB.height) - rect.y;
    return rect;
};

/**
 * Returns the overlapping portion of 2 rectangles
 * @function
 * @param {cc.Rect} rectA
 * @param {cc.Rect} rectB
 * @return {cc.Rect}
 */
cc.rectIntersection = function (rectA, rectB) {
    var intersection = cc.rect(
        Math.max(cc.rectGetMinX(rectA), cc.rectGetMinX(rectB)),
        Math.max(cc.rectGetMinY(rectA), cc.rectGetMinY(rectB)),
        0, 0);

    intersection.width = Math.min(cc.rectGetMaxX(rectA), cc.rectGetMaxX(rectB)) - cc.rectGetMinX(intersection);
    intersection.height = Math.min(cc.rectGetMaxY(rectA), cc.rectGetMaxY(rectB)) - cc.rectGetMinY(intersection);
    return intersection;
};