push-sprites.js

/* eslint-disable no-restricted-syntax */
this.hacks = this.hacks || {};
(function (exports, bitsy) {
'use strict';
var hackOptions = {
	// PUSH LOGIC

	playerPushesSprite: function (spr) {
		// return spr.name == 'cat'; // specific pushable sprite
		// return ['cat', 'dog', 'bird'].indexOf(spr.name) !== -1; // specific pushable sprite list
		// return spr.name && spr.name.indexOf('PUSHABLE') !== -1; // pushable flag in sprite name
		// if(!spr.name) return true; else return spr.name.indexOf('IMMOVABLE') == -1; // immovable flag in sprite name
		return true; // all sprites are pushable by player
	},

	spritePushesSprite: function (spr1, spr2) {
		return false; // sprites can't push other sprites
		// return spr1.name == 'dog'; // specific pushing sprite
		// return spr1.name == 'dog' && spr2.name == 'sheep'; // specific pair of pushing/pushable sprites
		// return ['dog', 'cat', 'horse'].indexOf(spr1.name) !== -1; // specific pushing sprite list
		// return spr1.name && spr1.name.indexOf('PUSHING') !== -1; // pushing flag in sprite name
		// return spr2.name && spr2.name.indexOf('PUSHABLE') !== -1; // pushable flag in sprite name
		// return true; // all sprites can push all other sprites
	},

	itemStopsSprite: function (itm, spr) {
		// return false; // no items are stopping
		// return itm.name == 'cup'; // specific stopping item
		// return ['cup', 'flower', 'hat'].indexOf(itm.name) !== -1; // specific stopping item list
		// return itm.name && itm.name.indexOf('STOPPING') !== -1; // stopping flag in item name
		return true; // all items are stopping
	},

	tileStopsSprite: function (til, spr) {
		// return false; // no tiles are stopping
		// return til.name == 'tree'; // specific stopping tile
		// return ['tree', 'bush', 'pond'].indexOf(til.name) !== -1; // specific stopping tile list
		// return til.name && til.name.indexOf('STOPPING') !== -1; // stopping flag in tile name
		return til.isWall; // all walls are stopping
		// if (til.name && til.name.indexOf('NONSTOPPING') !== -1) { return false; } else { return til.isWall; } // some walls are not stopping
		// return true; // all tiles are stopping
	},

	// EXIT HANDLING

	spriteCanExit: function (spr, ext) {
		// return false; // sprites can't be pushed through exits
		// return spr.name == 'cat'; // specific exiting sprite
		// return ['cat', 'dog', 'chicken'].indexOf(spr.name) !== -1; // specific exiting sprite list
		// return spr.name && spr.name.indexOf('EXITS') !== -1; // exiting flag in sprite name
		// return ['1','2'].indexOf(spr.room) !== -1; // specific exiting room list
		// return ['10','11'].indexOf(ext.dest.room) !== -1; // specific destination room list
		return true; // all sprites can use all exits
	},

	// TARGET STATES

	//
	// Target conditions for triggering dialogs.
	//
	// Each property of `conditions` sets up a trigger for a potential pair of dialogs,
	// `dialog_stem_true` and `dialog_stem_false`, which will be called after each player
	// move, depending on whether the condition is satisfied or not. Dialogs are only
	// called if they are present in the game data.
	//
	// Each condition consists of a set of sprite_conditions, which must all be
	// satisfied for the condition to become TRUE.
	//
	// A sprite_condition consists of a sprite_group and an OR_list.
	// The sprite_group specifies the subset of sprites that will be acceptable on the targets.
	// This can be a substring which the sprite name must contain, or one of the special
	// groups 'anything' (any sprite is on the target) or 'nothing' (no sprite is on the target).
	//
	// An OR_list specifies a set of AND_lists, any of which can evaluate to TRUE.
	//
	// An AND_list specifies a set of targets, all of which must be covered by a suitable sprite.
	//
	// Examples:
	//
	// [[[r,x,y]]] => a single target
	// [[[r1,x1,y1],[r2,x2,y2]]] => both target1 and target2 must be covered
	// [[[r1,x1,y1]],[[r2,x2,y2],[r3,x3,y3]]] => target1 || (target2 && target3)
	//
	// In summary:
	//
	// conditions <- {condition (, condition,...)}
	// condition <- 'dialog_stem': sprite_conditions
	// sprite_conditions <- {sprite_condition (, sprite_condition,...)}
	// sprite_condition <- 'sprite_group': OR_list
	// OR_list <- [AND_list (, AND_list,...]
	// AND_list <- [target (, target,...) ]
	// target <- [room,x,y]
	//
	conditions: {
		// Replace these examples with your own conditions.
		//
		// In room 0, dialog cover_bases_true is triggered when positions (5,10), (7,10) and (9,10)
		// are covered by a sprite of any kind; otherwise cover_bases_false is triggered.
		cover_bases: {
			anything: [
				[
					[0, 5, 10],
					[0, 7, 10],
					[0, 9, 10],
				],
			],
		},
		//
		// In room 1, dialog perfect_match_true is triggered when (9,5) has a BELL, (9,7) has
		// a BOOK and (9,9) has a CANDLE; otherwise perfect_match_false is triggered.
		perfect_match: {
			BELL: [[[1, 9, 5]]],
			BOOK: [[[1, 9, 7]]],
			CANDLE: [[[1, 9, 9]]],
		},
		//
		// In room 2, dialog floor_empty_true is triggered when no sprite is located at
		// (3,6), (3,7) or (3,8); otherwise floor_empty_false is triggered.
		floor_empty: {
			nothing: [
				[
					[2, 3, 6],
					[2, 3, 7],
					[2, 3, 8],
				],
			],
		},
		//
		// In room 3, dialog diagonal_true is triggered when there are ROCKs at
		// (7,9) and (8,10) or when there are ROCKs at (7,10) and (8,9);
		// otherwise diagonal_false is triggered. Note that no other positions are checked
		// for these two cases, so e.g. (7,9),(7,10),(8,9),(8,10) will still evaluate to TRUE.
		diagonal: {
			ROCK: [
				[
					[3, 7, 9],
					[3, 8, 10],
				],
				[
					[3, 7, 10],
					[3, 8, 9],
				],
			],
		},
	},

	// SPRITE FLIPPING

	// If `horizontalFlipsAllowed` is true:
	// 	pushing left will make a sprite face backwards
	// 	pushing right will make a sprite face forwards
	horizontalFlipsAllowed: false,

	// If `verticalFlipsAllowed` is true:
	// 	pushing down will make a sprite upside-down
	// 	pushing up will make a sprite right-side up
	verticalFlipsAllowed: false,
};

/**
@file utils
@summary miscellaneous bitsy utilities
@author Sean S. LeBlanc
@version 22.1.0
@requires Bitsy 8.12

*/


/*
Helper for getting image by name or id

Args:
	name: id or name of image to return
	 map: map of images (e.g. `sprite`, `tile`, `item`)

Returns: the image in the given map with the given name/id
 */
function getImage(name, map) {
	var id = Object.prototype.hasOwnProperty.call(map, name)
		? name
		: Object.keys(map).find(function (e) {
				return map[e].name === name;
			});
	return map[id];
}

/**
@file edit image at runtime
@summary API for updating image data at runtime.
@author Sean S. LeBlanc
@version 22.1.0
@requires Bitsy 8.12

@description
Adds API for updating sprite, tile, and item data at runtime.

Individual frames of image data in bitsy are 8x8 1-bit 2D arrays in yx order
e.g. the default player is:
[
	[0,0,0,1,1,0,0,0],
	[0,0,0,1,1,0,0,0],
	[0,0,0,1,1,0,0,0],
	[0,0,1,1,1,1,0,0],
	[0,1,1,1,1,1,1,0],
	[1,0,1,1,1,1,0,1],
	[0,0,1,0,0,1,0,0],
	[0,0,1,0,0,1,0,0]
]
*/

/*
Args:
	   id: string id or name
	frame: animation frame (0 or 1)
	  map: map of images (e.g. `sprite`, `tile`, `item`)

Returns: a single frame of a image data
*/
function getImageData(id, frame, map) {
	return bitsy.renderer.GetDrawingSource(getImage(id, map).drw)[frame];
}

function getSpriteData(id, frame) {
	return getImageData(id, frame, bitsy.sprite);
}

/*
Updates a single frame of image data

Args:
	     id: string id or name
	  frame: animation frame (0 or 1)
	    map: map of images (e.g. `sprite`, `tile`, `item`)
	newData: new data to write to the image data
*/
function setImageData(id, frame, map, newData) {
	var drawing = getImage(id, map);
	var drw = drawing.drw;
	var img = bitsy.renderer.GetDrawingSource(drw).slice();
	img[frame] = newData;
	bitsy.renderer.SetDrawingSource(drw, img);
}

function setSpriteData(id, frame, newData) {
	setImageData(id, frame, bitsy.sprite, newData);
}

/**
 * Helper used to replace code in a script tag based on a search regex.
 * To inject code without erasing original string, using capturing groups; e.g.
 * ```js
 * inject(/(some string)/,'injected before $1 injected after');
 * ```
 * @param searcher Regex to search and replace
 * @param replacer Replacer string/fn
 */
function inject(searcher, replacer) {
    // find the relevant script tag
    var scriptTags = document.getElementsByTagName('script');
    var scriptTag;
    var code = '';
    for (var i = 0; i < scriptTags.length; ++i) {
        scriptTag = scriptTags[i];
        if (!scriptTag.textContent)
            continue;
        var matchesSearch = scriptTag.textContent.search(searcher) !== -1;
        var isCurrentScript = scriptTag === document.currentScript;
        if (matchesSearch && !isCurrentScript) {
            code = scriptTag.textContent;
            break;
        }
    }
    // error-handling
    if (!code || !scriptTag) {
        throw new Error('Couldn\'t find "' + searcher + '" in script tags');
    }
    // modify the content
    code = code.replace(searcher, replacer);
    // replace the old script tag with a new one using our modified code
    var newScriptTag = document.createElement('script');
    newScriptTag.textContent = code;
    scriptTag.insertAdjacentElement('afterend', newScriptTag);
    scriptTag.remove();
}
/**
 * Helper for getting an array with unique elements
 * @param  {Array} array Original array
 * @return {Array}       Copy of array, excluding duplicates
 */
function unique(array) {
    return array.filter(function (item, idx) {
        return array.indexOf(item) === idx;
    });
}
// Ex: inject(/(names.sprite.set\( name, id \);)/, '$1console.dir(names)');
/** test */
function kitsyInject(searcher, replacer) {
    if (!kitsy.queuedInjectScripts.some(function (script) {
        return searcher.toString() === script.searcher.toString() && replacer === script.replacer;
    })) {
        kitsy.queuedInjectScripts.push({
            searcher: searcher,
            replacer: replacer,
        });
    }
    else {
        console.warn('Ignored duplicate inject');
    }
}
// Ex: before('load_game', function run() { alert('Loading!'); });
//     before('show_text', function run(text) { return text.toUpperCase(); });
//     before('show_text', function run(text, done) { done(text.toUpperCase()); });
function before$1(targetFuncName, beforeFn) {
    kitsy.queuedBeforeScripts[targetFuncName] = kitsy.queuedBeforeScripts[targetFuncName] || [];
    kitsy.queuedBeforeScripts[targetFuncName].push(beforeFn);
}
// Ex: after('load_game', function run() { alert('Loaded!'); });
function after$1(targetFuncName, afterFn) {
    kitsy.queuedAfterScripts[targetFuncName] = kitsy.queuedAfterScripts[targetFuncName] || [];
    kitsy.queuedAfterScripts[targetFuncName].push(afterFn);
}
function applyInjects() {
    kitsy.queuedInjectScripts.forEach(function (injectScript) {
        inject(injectScript.searcher, injectScript.replacer);
    });
}
function applyHooks(root) {
    var allHooks = unique(Object.keys(kitsy.queuedBeforeScripts).concat(Object.keys(kitsy.queuedAfterScripts)));
    allHooks.forEach(applyHook.bind(this, root || window));
}
function applyHook(root, functionName) {
    var functionNameSegments = functionName.split('.');
    var obj = root;
    while (functionNameSegments.length > 1) {
        obj = obj[functionNameSegments.shift()];
    }
    var lastSegment = functionNameSegments[0];
    var superFn = obj[lastSegment];
    var superFnLength = superFn ? superFn.length : 0;
    var functions = [];
    // start with befores
    functions = functions.concat(kitsy.queuedBeforeScripts[functionName] || []);
    // then original
    if (superFn) {
        functions.push(superFn);
    }
    // then afters
    functions = functions.concat(kitsy.queuedAfterScripts[functionName] || []);
    // overwrite original with one which will call each in order
    obj[lastSegment] = function () {
        var returnVal;
        var args = [].slice.call(arguments);
        var i = 0;
        function runBefore() {
            // All outta functions? Finish
            if (i === functions.length) {
                return returnVal;
            }
            // Update args if provided.
            if (arguments.length > 0) {
                args = [].slice.call(arguments);
            }
            if (functions[i].length > superFnLength) {
                // Assume funcs that accept more args than the original are
                // async and accept a callback as an additional argument.
                return functions[i++].apply(this, args.concat(runBefore.bind(this)));
            }
            // run synchronously
            returnVal = functions[i++].apply(this, args);
            if (returnVal && returnVal.length) {
                args = returnVal;
            }
            return runBefore.apply(this, args);
        }
        return runBefore.apply(this, arguments);
    };
}
/**
@file kitsy-script-toolkit
@summary Monkey-patching toolkit to make it easier and cleaner to run code before and after functions or to inject new code into script tags
@license WTFPL (do WTF you want)
@author Original by mildmojo; modified by Sean S. LeBlanc
@version 22.1.0
@requires Bitsy 8.12

*/
var kitsy = (window.kitsy = window.kitsy || {
    queuedInjectScripts: [],
    queuedBeforeScripts: {},
    queuedAfterScripts: {},
    inject: kitsyInject,
    before: before$1,
    after: after$1,
    /**
     * Applies all queued `inject` calls.
     *
     * An object that instantiates an class modified via injection will still refer to the original class,
     * so make sure to reinitialize globals that refer to injected scripts before calling `applyHooks`.
     */
    applyInjects,
    /** Apples all queued `before`/`after` calls. */
    applyHooks,
});

var hooked = kitsy.hooked;
if (!hooked) {
	kitsy.hooked = true;
	var oldStartFunc = bitsy.startExportedGame;
	bitsy.startExportedGame = function doAllInjections() {
		// Only do this once.
		bitsy.startExportedGame = oldStartFunc;

		// Rewrite scripts
		kitsy.applyInjects();

		// recreate the script and dialog objects so that they'll be
		// referencing the code with injections instead of the original
		bitsy.scriptModule = new bitsy.Script();
		bitsy.scriptInterpreter = bitsy.scriptModule.CreateInterpreter();

		bitsy.dialogModule = new bitsy.Dialog();
		bitsy.dialogRenderer = bitsy.dialogModule.CreateRenderer();
		bitsy.dialogBuffer = bitsy.dialogModule.CreateBuffer();
		bitsy.renderer = new bitsy.TileRenderer(bitsy.tilesize);
		bitsy.transition = new bitsy.TransitionManager();

		// Hook everything
		kitsy.applyHooks();

		// Start the game
		bitsy.startExportedGame.apply(this, arguments);
	};
}

/** @see kitsy.inject */
kitsy.inject;
/** @see kitsy.before */
var before = kitsy.before;
/** @see kitsy.after */
var after = kitsy.after;

/**
@file transform sprite data
@summary Helpers for flipping and rotating sprite data
*/


// helper function to flip sprite data
function transformSpriteData(spriteData, v, h, rot) {
	var x;
	var y;
	var x2;
	var y2;
	var col;
	var tmp;
	var s = spriteData.slice();
	if (v) {
		for (y = 0; y < s.length / 2; ++y) {
			y2 = s.length - y - 1;
			tmp = s[y];
			s[y] = s[y2];
			s[y2] = tmp;
		}
	}
	if (h) {
		for (y = 0; y < s.length; ++y) {
			col = s[y] = s[y].slice();
			for (x = 0; x < col.length / 2; ++x) {
				x2 = col.length - x - 1;
				tmp = col[x];
				col[x] = col[x2];
				col[x2] = tmp;
			}
		}
	}
	return s;
}

/**
➡
@file push sprites
@summary sokoban-style sprite pushing
@license MIT
@author jan0sc
@version 22.1.0
@requires Bitsy 8.12


@description
Hack to make sprites pushable.

HOW TO USE:
1. Copy-paste into a script tag after the bitsy source
2. Edit hackOptions below to specify the push logic, exit handling, target states and whether to flip drawings

PUSH LOGIC:
functions to determine:
	1. the sprites that the player can push
	2. the sprites that a pushed sprite can push
	3. the items that stop a sprite from moving
	4. the tiles that stop a sprite from moving

EXIT HANDLING:
function to determine whether a sprite will be allowed to transit an exit

TARGET STATES:
object specifying which dialogs to trigger and under what conditions

SPRITE FLIPPING:
allow or disallow drawing flips when a sprite is pushed

*/




before('movePlayer', function (direction) {
	var spriteId = null;

	switch (direction) {
		case bitsy.Direction.Up:
			spriteId = bitsy.getSpriteUp();
			break;
		case bitsy.Direction.Down:
			spriteId = bitsy.getSpriteDown();
			break;
		case bitsy.Direction.Left:
			spriteId = bitsy.getSpriteLeft();
			break;
		case bitsy.Direction.Right:
			spriteId = bitsy.getSpriteRight();
			break;
	}

	if (spriteId && hackOptions.playerPushesSprite(bitsy.sprite[spriteId])) {
		var success = pushSprite(bitsy.sprite[spriteId], direction);
		if (!success) {
			// flip the sprite even if it doesn't move
			updateImage(bitsy.sprite[spriteId]);
		}
	}
});

//
// push handling
//

function pushSprite(spr, direction) {
	var sprs;
	var newx;
	var newy;

	switch (direction) {
		case bitsy.Direction.Up:
			newx = spr.x;
			newy = spr.y - 1;
			break;
		case bitsy.Direction.Down:
			newx = spr.x;
			newy = spr.y + 1;
			break;
		case bitsy.Direction.Left:
			newx = spr.x - 1;
			newy = spr.y;
			break;
		case bitsy.Direction.Right:
			newx = spr.x + 1;
			newy = spr.y;
			break;
	}

	if (moveOK(spr, newx, newy, direction)) {
		sprs = getAllSpritesAt(spr.room, spr.x, spr.y);
		sprs.forEach(function (s) {
			updateImage(s);
			s.x = newx;
			s.y = newy;
		});
		checkExit(spr, direction);
		bitsy.drawRoom(bitsy.room[bitsy.state.room], { redrawAll: true });
		return true;
	}
	return false;
}

function moveOK(spr, newx, newy, direction) {
	var next = getFirstSpriteAt(spr.room, newx, newy);
	// either there is a space or the next sprite moves
	return (!next && itemOK(spr, newx, newy) && tileOK(spr, newx, newy)) || (next && spriteOK(spr, next) && pushSprite(next, direction));
}

function spriteOK(spr1, spr2) {
	return hackOptions.spritePushesSprite(spr1, spr2);
}

function itemOK(spr, x, y) {
	var items = bitsy.room[spr.room].items;
	if (items.length > 0) {
		for (var itm of items) {
			if (hackOptions.itemStopsSprite(bitsy.item[itm.id], spr) && itm.x === x && itm.y === y) {
				return false;
			}
		}
	}
	return true;
}

function tileOK(spr, x, y) {
	if (x < 0 || y < 0 || x >= bitsy.mapsize || y >= bitsy.mapsize) {
		return false;
	} // can't push sprite off the edge
	var tileid = bitsy.room[spr.room].tilemap[y][x];
	if (tileid === '0') {
		return true;
	} // no tile => no problem
	if (hackOptions.tileStopsSprite(bitsy.tile[tileid], spr)) {
		return false;
	}
	return true;
}

function getFirstSpriteAt(r, x, y) {
	return Object.values(bitsy.sprite).find(function (spr) {
		return spr.room === r && spr.x === x && spr.y === y;
	});
}

function getAllSpritesAt(r, x, y) {
	return Object.values(bitsy.sprite).filter(function (spr) {
		return spr.room === r && spr.x === x && spr.y === y;
	});
}

//
// exit handling
//

function checkExit(spr, direction) {
	var source = spr.room;
	var ext = bitsy.room[source].exits.find(function (e) {
		return spr.x === e.x && spr.y === e.y;
	});

	if (ext) {
		// move sprite through exit to the destination
		spr.room = ext.dest.room;
		spr.x = ext.dest.x;
		spr.y = ext.dest.y;

		// try to push one cell in same direction
		var success = pushSprite(spr, direction);

		if (success) {
			// if it succeeds, move any remaining sprites across to join it
			var sprs = getAllSpritesAt(source, ext.x, ext.y);
			sprs.forEach(function (s) {
				s.room = spr.room;
				s.x = spr.x;
				s.y = spr.y;
			});
		} else {
			// if it fails, sprite cannot transit so move it back
			spr.room = source;
			spr.x = ext.x;
			spr.y = ext.y;
		}
	}
}

//
// target handling
//

var targetsLookup;

function checkTargets() {
	var spr;
	var k;
	var s;
	targetsLookup = [];
	for (var id in bitsy.sprite) {
		if (Object.prototype.hasOwnProperty.call(bitsy.sprite, id)) {
			spr = bitsy.sprite[id];
			if (spr.name) {
				targetsLookup[spr.room] = targetsLookup[spr.room] || [];
				targetsLookup[spr.room][spr.x] = targetsLookup[spr.room][spr.x] || [];
				targetsLookup[spr.room][spr.x][spr.y] = spr.name;
			}
		}
	}
	targetsLookup[bitsy.state.room] = targetsLookup[bitsy.state.room] || [];
	targetsLookup[bitsy.state.room][bitsy.player().x] = targetsLookup[bitsy.state.room][bitsy.player().x] || [];
	targetsLookup[bitsy.state.room][bitsy.player().x][bitsy.player().y] = bitsy.playerId;

	for (k in hackOptions.conditions) {
		if (Object.prototype.hasOwnProperty.call(hackOptions.conditions, k)) {
			var result = true;
			for (s in hackOptions.conditions[k]) {
				if (Object.prototype.hasOwnProperty.call(hackOptions.conditions[k], s)) {
					result = result && checkOR(s, hackOptions.conditions[k][s]);
				}
			}
			var dialogId;
			if (result) {
				dialogId = k + '_true';
			} else {
				dialogId = k + '_false';
			}

			if (bitsy.dialog[dialogId]) {
				var dialogStr = bitsy.dialog[dialogId];
				bitsy.startDialog(dialogStr, dialogId);
			}
		}
	}
}

after('movePlayer', function (direction) {
	if (!bitsy.isNarrating && !bitsy.isDialogMode) checkTargets();
});

function check(s, xyz) {
	if (s === 'nothing') {
		return targetsLookup[xyz[0]] === undefined || targetsLookup[xyz[0]][xyz[1]] === undefined || targetsLookup[xyz[0]][xyz[1]][xyz[2]] === undefined;
	}
	return targetsLookup[xyz[0]] && targetsLookup[xyz[0]][xyz[1]] && targetsLookup[xyz[0]][xyz[1]][xyz[2]] && isCompatible(s, targetsLookup[xyz[0]][xyz[1]][xyz[2]]);
}

function checkAND(s, xyzs) {
	var result = true;
	for (var xyz of xyzs) {
		result = result && check(s, xyz);
		if (!result) {
			return false;
		}
	}
	return true;
}

function checkOR(s, xyzss) {
	for (var xyzs of xyzss) {
		if (checkAND(s, xyzs)) {
			return true;
		}
	}
	return false;
}

function isCompatible(p, q) {
	if (p === 'anything') {
		return true;
	}
	if (p === bitsy.playerId) {
		return q === bitsy.playerId;
	}
	return q.includes(p);
}

//
// sprite flipping
//

var originalAnimations = [];
var hflips = [];
var vflips = [];

before('onready', function () {
	var i;
	for (var id in bitsy.sprite) {
		if (Object.prototype.hasOwnProperty.call(bitsy.sprite, id)) {
			var spr = bitsy.sprite[id];

			originalAnimations[spr.id] = {
				frames: [],
			};
			for (i = 0; i < spr.animation.frameCount; ++i) {
				originalAnimations[spr.id].frames.push(getSpriteData(spr.id, i));
			}

			hflips[spr.id] = false;
			vflips[spr.id] = false;
		}
	}
});

function updateImage(spr) {
	// determine which directions need flipping
	switch (bitsy.curPlayerDirection) {
		case bitsy.Direction.Up:
			if (hackOptions.verticalFlipsAllowed) {
				vflips[spr.id] = false;
			}
			break;
		case bitsy.Direction.Down:
			if (hackOptions.verticalFlipsAllowed) {
				vflips[spr.id] = true;
			}
			break;
		case bitsy.Direction.Left:
			if (hackOptions.horizontalFlipsAllowed) {
				hflips[spr.id] = true;
			}
			break;
		case bitsy.Direction.Right:
			if (hackOptions.horizontalFlipsAllowed) {
				hflips[spr.id] = false;
			}
			break;
	}

	// update sprite with flipped frames
	for (var i = 0; i < originalAnimations[spr.id].frames.length; ++i) {
		setSpriteData(spr.id, i, transformSpriteData(originalAnimations[spr.id].frames[i], vflips[spr.id], hflips[spr.id]));
	}
}

exports.hackOptions = hackOptions;

})(this.hacks["push-sprites"] = this.hacks["push-sprites"] || {}, window);