diff options
Diffstat (limited to 'jaws/src/collision_detection.js')
| -rwxr-xr-x | jaws/src/collision_detection.js | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/jaws/src/collision_detection.js b/jaws/src/collision_detection.js deleted file mode 100755 index 2f4588c..0000000 --- a/jaws/src/collision_detection.js +++ /dev/null @@ -1,226 +0,0 @@ -if(typeof require !== "undefined") { var jaws = require("./core.js"); }
-
-/**
- * @fileOverview Collision Detection
- *
- * Collision detection helpers.
- *
- * @example
- * // collision helper exampels:
- * collideOneWithOne(player, boss) // -> false
- * collideOneWithMany(player, bullets) // -> [bullet1, bullet1]
- * collideManyWithMany(bullets, enemies) // -> [ [bullet1, enemy1], [bullet2, enemy2] ]
- * collide(player, boss) // -> false
- * collide(player,
- * bullets,
- * function(player, bullet) {}) // Callback: arguments[0] -> player
- * // arguments[1] -> bullets[i]
- *
- */
-var jaws = (function(jaws) {
-
- /**
- * Collides two objects by reading x, y and either method rect() or property radius.
- * @public
- * @param {object} object1 An object with a 'radius' or 'rect' property
- * @param {object} object2 An object with a 'radius' or 'rect' property
- * @returns {boolean} If the two objects are colliding or not
- */
- jaws.collideOneWithOne = function(object1, object2) {
- if (object1.radius && object2.radius && object1 !== object2 && jaws.collideCircles(object1, object2))
- return true;
-
- if (object1.rect && object2.rect && object1 !== object2 && jaws.collideRects(object1.rect(), object2.rect()))
- return true;
-
- return false;
- };
-
- /**
- * Compares an object against a list, returning those from list that collide with object, and
- * calling 'callback' per collision (if set) with object and item from list.
- * (Note: Will never collide objects with themselves.)
- * @public
- * @param {object} object An object with a 'radius' or 'rect' property
- * @param {array|object} list A collection of objects with a 'length' property
- * @param {function} callback The function to be called per collison detected
- * @returns {array} A collection of items colliding with object from list
- * @example
- * collideOneWithMany(player, bullets) // -> [bullet1, bullet1]
- * collideOneWithMany(player, bullets, function(player, bullet) {
- * //player and bullet (bullets[i])
- * });
- */
- jaws.collideOneWithMany = function(object, list, callback) {
- var a = [];
- if (callback) {
- for (var i = 0; i < list.length; i++) {
- if (jaws.collideOneWithOne(object, list[i])) {
- callback(object, list[i]);
- a.push(list[i])
- }
- }
- return a;
- }
- else {
- return list.filter(function(item) {
- return jaws.collideOneWithOne(object, item);
- });
- }
- };
-
- /**
- * Compares two lists, returning those items from each that collide with each other, and
- * calling 'callback' per collision (if set) with item from list1 and item from list2.
- * (Note: Will never collide objects with themselves.)
- * @public
- * @param {array|object} list1 A collection of objects with a 'forEach' property
- * @param {array|object} list2 A collection of objects with a 'forEach' property
- * @param {function} callback The function to be called per collison detected
- * @returns {array} A collection of items colliding with list1 from list2
- * @example
- * jaws.collideManyWithMany(bullets, enemies) // --> [[bullet, enemy], [bullet, enemy]]
- */
- jaws.collideManyWithMany = function(list1, list2, callback) {
- var a = [];
-
- if (list1 === list2) {
- combinations(list1, 2).forEach(function(pair) {
- if (jaws.collideOneWithOne(pair[0], pair[1])) {
- if (callback) {
- callback(pair[0], pair[1]);
- }
- else {
- a.push([pair[0], pair[1]]);
- }
- }
- });
- }
- else {
- list1.forEach(function(item1) {
- list2.forEach(function(item2) {
- if (jaws.collideOneWithOne(item1, item2)) {
- if (callback) {
- callback(item1, item2);
- }
- else {
- a.push([item1, item2]);
- }
- }
- });
- });
- }
-
- return a;
- };
-
- /**
- * Returns if two circle-objects collide with each other
- * @public
- * @param {object} object1 An object with a 'radius' property
- * @param {object} object2 An object with a 'radius' property
- * @returns {boolean} If two circle-objects collide or not
- */
- jaws.collideCircles = function(object1, object2) {
- return (jaws.distanceBetween(object1, object2) < object1.radius + object2.radius);
- };
-
- /**
- * Returns if two Rects collide with each other or not
- * @public
- * @param {object} rect1 An object with 'x', 'y', 'right' and 'bottom' properties
- * @param {object} rect2 An object with 'x', 'y', 'right' and 'bottom' properties
- * @returns {boolean} If two Rects collide with each other or not
- */
- jaws.collideRects = function(rect1, rect2) {
- return ((rect1.x >= rect2.x && rect1.x <= rect2.right) || (rect2.x >= rect1.x && rect2.x <= rect1.right)) &&
- ((rect1.y >= rect2.y && rect1.y <= rect2.bottom) || (rect2.y >= rect1.y && rect2.y <= rect1.bottom));
- };
-
- /**
- * Returns the distance between two objects
- * @public
- * @param {object} object1 An object with 'x' and 'y' properties
- * @param {object} object2 An object with 'x' and 'y' properties
- * @returns {number} The distance between two objects
- */
- jaws.distanceBetween = function(object1, object2) {
- return Math.sqrt(Math.pow(object1.x - object2.x, 2) + Math.pow(object1.y - object2.y, 2));
- };
-
- /**
- * Creates combinations of items from a list of a specific size
- * @private
- * @param {array|object} list An object with a 'length' property
- * @param {number} n The size of the array to return
- * @returns {Array} An array of items having a specific size number of its own entries
- */
- function combinations(list, n) {
- var f = function(i) {
- if (list.isSpriteList !== undefined) {
- return list.at(i);
- } else { // s is an Array
- return list[i];
- }
- };
- var r = [];
- var m = new Array(n);
- for (var i = 0; i < n; i++)
- m[i] = i;
- for (var i = n - 1, sn = list.length; 0 <= i; sn = list.length) {
- r.push(m.map(f));
- while (0 <= i && m[i] === sn - 1) {
- i--;
- sn--;
- }
- if (0 <= i) {
- m[i] += 1;
- for (var j = i + 1; j < n; j++)
- m[j] = m[j - 1] + 1;
- i = n - 1;
- }
- }
- return r;
- }
-
- /**
- * If an object has items or not
- * @private
- * @param {array|object} array An object with a 'length' property
- * @returns {boolean} If the object has items (length > 0)
- */
- function hasItems(array) {
- return (array && array.length > 0);
- }
-
- /**
- * Compares two objects or lists, returning if they collide, and
- * calling 'callback' per collision (if set) between objects or lists.
- * @param {array|object} x An object with either 'rect' or 'forEach' property
- * @param {array|object} x2 An object with either 'rect' or 'forEach' property
- * @param {function} callback
- * @returns {boolean}
- * @examples
- * jaws.collide(player, enemy, function(player, enemy) { ... } )
- * jaws.collide(player, enemies, function(player, enemy) { ... } )
- * jaws.collide(bullets, enemies, function(bullet, enemy) { ... } )
- */
- jaws.collide = function(x, x2, callback) {
- if ((x.rect || x.radius) && x2.forEach)
- return (jaws.collideOneWithMany(x, x2, callback).length > 0);
- if (x.forEach && x2.forEach)
- return (jaws.collideManyWithMany(x, x2, callback).length > 0);
- if (x.forEach && (x2.rect || x2.radius))
- return (jaws.collideOneWithMany(x2, x, callback).length > 0);
- if ((x.rect && x2.rect) || (x.radius && x2.radius)) {
- var result = jaws.collideOneWithOne(x, x2);
- if (callback && result)
- callback(x, x2);
- else
- return result;
- }
- };
-
- return jaws;
-})(jaws || {});
-
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