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Diffstat (limited to 'templates/project/assets/javascripts/gridster/jquery.collision.js')
| -rwxr-xr-x | templates/project/assets/javascripts/gridster/jquery.collision.js | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/templates/project/assets/javascripts/gridster/jquery.collision.js b/templates/project/assets/javascripts/gridster/jquery.collision.js new file mode 100755 index 0000000..5d37c61 --- /dev/null +++ b/templates/project/assets/javascripts/gridster/jquery.collision.js @@ -0,0 +1,224 @@ +/* + * jquery.collision + * https://github.com/ducksboard/gridster.js + * + * Copyright (c) 2012 ducksboard + * Licensed under the MIT licenses. + */ + +;(function($, window, document, undefined){ + + var defaults = { + colliders_context: document.body + // ,on_overlap: function(collider_data){}, + // on_overlap_start : function(collider_data){}, + // on_overlap_stop : function(collider_data){} + }; + + + /** + * Detects collisions between a DOM element against other DOM elements or + * Coords objects. + * + * @class Collision + * @uses Coords + * @param {HTMLElement} el The jQuery wrapped HTMLElement. + * @param {HTMLElement|Array} colliders Can be a jQuery collection + * of HTMLElements or an Array of Coords instances. + * @param {Object} [options] An Object with all options you want to + * overwrite: + * @param {Function} [options.on_overlap_start] Executes a function the first + * time each `collider ` is overlapped. + * @param {Function} [options.on_overlap_stop] Executes a function when a + * `collider` is no longer collided. + * @param {Function} [options.on_overlap] Executes a function when the + * mouse is moved during the collision. + * @return {Object} Collision instance. + * @constructor + */ + function Collision(el, colliders, options) { + this.options = $.extend(defaults, options); + this.$element = el; + this.last_colliders = []; + this.last_colliders_coords = []; + if (typeof colliders === 'string' || colliders instanceof jQuery) { + this.$colliders = $(colliders, + this.options.colliders_context).not(this.$element); + }else{ + this.colliders = $(colliders); + } + + this.init(); + } + + + var fn = Collision.prototype; + + + fn.init = function() { + this.find_collisions(); + }; + + + fn.overlaps = function(a, b) { + var x = false; + var y = false; + + if ((b.x1 >= a.x1 && b.x1 <= a.x2) || + (b.x2 >= a.x1 && b.x2 <= a.x2) || + (a.x1 >= b.x1 && a.x2 <= b.x2) + ) { x = true; } + + if ((b.y1 >= a.y1 && b.y1 <= a.y2) || + (b.y2 >= a.y1 && b.y2 <= a.y2) || + (a.y1 >= b.y1 && a.y2 <= b.y2) + ) { y = true; } + + return (x && y); + }; + + + fn.detect_overlapping_region = function(a, b){ + var regionX = ''; + var regionY = ''; + + if (a.y1 > b.cy && a.y1 < b.y2) { regionX = 'N'; } + if (a.y2 > b.y1 && a.y2 < b.cy) { regionX = 'S'; } + if (a.x1 > b.cx && a.x1 < b.x2) { regionY = 'W'; } + if (a.x2 > b.x1 && a.x2 < b.cx) { regionY = 'E'; } + + return (regionX + regionY) || 'C'; + }; + + + fn.calculate_overlapped_area_coords = function(a, b){ + var x1 = Math.max(a.x1, b.x1); + var y1 = Math.max(a.y1, b.y1); + var x2 = Math.min(a.x2, b.x2); + var y2 = Math.min(a.y2, b.y2); + + return $({ + left: x1, + top: y1, + width : (x2 - x1), + height: (y2 - y1) + }).coords().get(); + }; + + + fn.calculate_overlapped_area = function(coords){ + return (coords.width * coords.height); + }; + + + fn.manage_colliders_start_stop = function(new_colliders_coords, start_callback, stop_callback){ + var last = this.last_colliders_coords; + + for (var i = 0, il = last.length; i < il; i++) { + if ($.inArray(last[i], new_colliders_coords) === -1) { + start_callback.call(this, last[i]); + } + } + + for (var j = 0, jl = new_colliders_coords.length; j < jl; j++) { + if ($.inArray(new_colliders_coords[j], last) === -1) { + stop_callback.call(this, new_colliders_coords[j]); + } + + } + }; + + + fn.find_collisions = function(player_data_coords){ + var self = this; + var colliders_coords = []; + var colliders_data = []; + var $colliders = (this.colliders || this.$colliders); + var count = $colliders.length; + var player_coords = self.$element.coords() + .update(player_data_coords || false).get(); + + while(count--){ + var $collider = self.$colliders ? + $($colliders[count]) : $colliders[count]; + var $collider_coords_ins = ($collider.isCoords) ? + $collider : $collider.coords(); + var collider_coords = $collider_coords_ins.get(); + var overlaps = self.overlaps(player_coords, collider_coords); + + if (!overlaps) { + continue; + } + + var region = self.detect_overlapping_region( + player_coords, collider_coords); + + //todo: make this an option + if (region === 'C'){ + var area_coords = self.calculate_overlapped_area_coords( + player_coords, collider_coords); + var area = self.calculate_overlapped_area(area_coords); + var collider_data = { + area: area, + area_coords : area_coords, + region: region, + coords: collider_coords, + player_coords: player_coords, + el: $collider + }; + + if (self.options.on_overlap) { + self.options.on_overlap.call(this, collider_data); + } + colliders_coords.push($collider_coords_ins); + colliders_data.push(collider_data); + } + } + + if (self.options.on_overlap_stop || self.options.on_overlap_start) { + this.manage_colliders_start_stop(colliders_coords, + self.options.on_overlap_stop, self.options.on_overlap_start); + } + + this.last_colliders_coords = colliders_coords; + + return colliders_data; + }; + + + fn.get_closest_colliders = function(player_data_coords){ + var colliders = this.find_collisions(player_data_coords); + var min_area = 100; + colliders.sort(function(a, b){ + if (a.area <= min_area) { + return 1; + } + + /* if colliders are being overlapped by the "C" (center) region, + * we have to set a lower index in the array to which they are placed + * above in the grid. */ + if (a.region === 'C' && b.region === 'C') { + if (a.coords.y1 < b.coords.y1 || a.coords.x1 < b.coords.x1) { + return - 1; + }else{ + return 1; + } + } + + if (a.area < b.area){ + return 1; + } + + return 1; + }); + return colliders; + }; + + + //jQuery adapter + $.fn.collision = function(collider, options) { + return new Collision( this, collider, options ); + }; + + +}(jQuery, window, document)); |