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lasertank-js
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Using circular linked lists for tile animations 

This will drastically simplify animations and allow for a more basic mapping
of "game objects" to tiles
master
Mike Gerwitz 2012-03-14 20:37:31 -04:00
parent ae01d6ee08
commit 5e60d6c9e5
4 changed files with 150 additions and 125 deletions
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44
lib/ClassicTileDfn.js
View File

@ -30,8 +30,8 @@ ltjs.ClassicTileDfn = Class( 'ClassicTileDfn' )
*
* The definition should be an array of arrays, with the first index
* representing the tile id and the second index representing whether or not
* a mask should be applied (0 or 1). A list of standard tile ids are
* provided at the top of this file.
* a mask should be applied (0 or 1). Multiple tiles with the same id will
* be combined into frames for animation.
*
* The tiles are expected to be parsed per row, beginning at the upper-left
* corner. Specifying the tiles in this manner is both concise and helps to
@ -49,19 +49,19 @@ ltjs.ClassicTileDfn = Class( 'ClassicTileDfn' )
[ 'tdown', 1 ], /* tank down */
[ 'tleft', 1 ], /* tank left */
[ 'base', 0 ], /* base */
[ 'basealt', 0 ], /* base alt */
[ 'basealt2', 0 ], /* base alt 2 */
[ 'base', 0 ], /* base alt */
[ 'base', 0 ], /* base alt 2 */
[ 'water', 0 ], /* water */
[ 'wateralt', 0 ], /* water alt */
[ 'water', 0 ], /* water alt */
[ 'wateralt2', 0 ], /* water alt 2 */
[ 'water', 0 ], /* water alt 2 */
[ 'atdownb', 1 ], /* anti-tank, blown up, down */
[ 'block', 0 ], /* non-movable block */
[ 'mblock', 0 ], /* movable block */
[ 'brick', 0 ], /* brick */
[ 'atup', 1 ], /* anti-tank up */
[ 'atupalt', 1 ], /* anti-tank up alt */
[ 'atupalt2', 1 ], /* anti-tank up alt 2 */
[ 'atup', 1 ], /* anti-tank up alt */
[ 'atup', 1 ], /* anti-tank up alt 2 */
[ 'mblockw', 0 ], /* movable block in water */
[ 'mirrorul', 1 ], /* mirror up-left */
@ -69,28 +69,28 @@ ltjs.ClassicTileDfn = Class( 'ClassicTileDfn' )
[ 'mirrordr', 1 ], /* mirror down-right */
[ 'mirrordl', 1 ], /* mirror down-left */
[ 'owup', 0 ], /* one-way up */
[ 'owupalt', 0 ], /* one-way up alt */
[ 'owupalt2', 0 ], /* one-way up alt 2 */
[ 'owup', 0 ], /* one-way up alt */
[ 'owup', 0 ], /* one-way up alt 2 */
[ 'owright', 0 ], /* one-way right */
[ 'owrightalt', 0 ], /* one-way right alt */
[ 'owrightalt2', 0 ], /* one-way right alt 2 */
[ 'owright', 0 ], /* one-way right alt */
[ 'owright', 0 ], /* one-way right alt 2 */
[ 'owdown', 0 ], /* one-way down */
[ 'owdownalt', 0 ], /* one-way down alt */
[ 'owdownalt2', 0 ], /* one-way down alt 2 */
[ 'owdown', 0 ], /* one-way down alt */
[ 'owdown', 0 ], /* one-way down alt 2 */
[ 'owleft', 0 ], /* one-way left */
[ 'owleftalt', 0 ], /* one-way left alt */
[ 'owleftalt2', 0 ], /* one-way left alt 3 */
[ 'owleft', 0 ], /* one-way left alt */
[ 'owleft', 0 ], /* one-way left alt 3 */
[ 'atright', 1 ], /* anti-tank right */
[ 'atrightalt', 1 ], /* anti-tank right alt */
[ 'atrightalt2', 1 ], /* anti-tank right alt 2 */
[ 'atright', 1 ], /* anti-tank right alt */
[ 'atright', 1 ], /* anti-tank right alt 2 */
[ 'atdown', 1 ], /* anti-tank down */
[ 'atdownalt', 1 ], /* anti-tank down alt */
[ 'atdown', 1 ], /* anti-tank down alt */
[ 'atdownalt2', 1 ], /* anti-tank down alt 2 */
[ 'atdown', 1 ], /* anti-tank down alt 2 */
[ 'atleft', 1 ], /* anti-tank left */
[ 'atleftalt', 1 ], /* anti-tank left alt */
[ 'atleftalt2', 1 ], /* anti-tank left alt 2 */
[ 'atleft', 1 ], /* anti-tank left alt */
[ 'atleft', 1 ], /* anti-tank left alt 2 */
[ 'cblock', 0 ], /* crystal block */
[ 'cblockht', 0 ], /* crystal block hit by tank */
[ 'rmirrorul', 0 ], /* roto-mirror up-left */

36
lib/TileDfn.js
View File

@ -28,9 +28,13 @@
* add additional features to the game, or even to simply restructure the tile
* positions of the current one), we have them covered.
*
* Many tiles are used for the purpose of creating animations. In order to
* support an arbitrary number of frame tiles for any type of tile, animations
* will be created from tiles that share the same id. When a tile is encountered
* with a duplicate id, it is added to any previous tiles to create animation
* frames in the order in which they appear in the definition.
*
* Below is a list of standard ids that must be mapped for classic game play.
* The *alt tiles are used in animation (the terminology comes from the original
* game sources).
*
* dirt - dirt
* tup - tank up
@ -38,55 +42,30 @@
* tdown - tank down
* tleft - tank left
* base - base
* basealt - base alt
* basealt2 - base alt 2
* water - water
* wateralt - water alt
*
* wateralt2 - water alt 2
* atdownb - anti-tank down
* block - block
* mblock - movable block
* brick - brick
* atup - anti-tank up
* atupalt - anti-tank up alt
* atupalt2 - anti-tank up alt 2
* mblockw - movable block in water
* mirrorul - mirror up-left
*
* mirrorur - mirror up-right
* mirrordr - mirror down-right
* mirrordl - mirror down-left
* owup - one-way up
* owupalt - one-way up alt
* owupalt2 - one-way up alt 2
* owright - one-way right
* owrightalt - one-way right alt
* owrightalt2 - one-way right alt 2
* owdown - one-way down
*
* owdownalt - one-way down alt
* owdownalt2 - one-way down alt 2
* owleft - one-way left
* owleftalt - one-way left alt
* owleftalt2 - one-way left alt 3
* atright - anti-tank right
* atrightalt - anti-tank right alt
* atrightalt2 - anti-tank right alt 2
* atdown - anti-tank down
* atdownalt - anti-tank down alt
*
* atdownalt2 - anti-tank down alt 2
* atleft - anti-tank left
* atleftalt - anti-tank left alt
* atleftalt2 - anti-tank left alt 2
* cblock - crystal block
* cblockht - crystal block hit by tank
* rmirrorul - roto-mirror up-left
* rmirrorur - roto-mirror up-right
* rmirrordr - roto-mirror down-right
* rmirrordl - roto-mirror down-left
*
* cblockhat - crystal block hit by anti-tank
* atrightb - anti-tank, blown up, right
* atleftb - anti-tank, blown up, left
@ -112,7 +91,8 @@ ltjs.TileDfn = Interface( 'TileDfn',
* The definition should be an array of arrays, with the first index
* representing the tile id and the second index representing whether or not
* a mask should be applied (0 or 1). A list of standard tile ids are
* provided at the top of this file.
* provided at the top of this file. Multiple tiles with the same id will be
* combined into frames to create an animation.
*
* The tiles are expected to be parsed per row, beginning at the upper-left
* corner. Specifying the tiles in this manner is both concise and helps to

39
lib/TileMasker.js
View File

@ -258,7 +258,7 @@ ltjs.TileMasker = Class( 'TileMasker',
// create each tile (preserving order, thus no decrementing)
while ( ++i < len )
{
var name = tdata[ i ][ 0 ],
var id = tdata[ i ][ 0 ],
mask = tdata[ i ][ 1 ],
// calculate the X and Y position of this tile based on the tile
@ -268,15 +268,48 @@ ltjs.TileMasker = Class( 'TileMasker',
// the third index indicates whether or not a mask should be applied
// to the tile
tiles[ name ] = ( mask === 1 )
this.appendTileFrame( tiles, id, ( mask === 1 )
? this.getMaskedTileData( data_mask, x, y )
: this.getTileData( x, y );
: this.getTileData( x, y )
);
}
callback( tiles );
},
/**
* Adds a tile frame to the set, permitting animation
*
* This creates a circular linked list with each of the frames for a given
* tile id. This structure is ideal for looping animations. One can simply
* check to see if the tile has a single frame by performing a strict
* equality check on the current tile and its 'next' entry.
*
* @param {Object.<string>} set set to append tile frame to
* @param {string} id tile id
* @param {Object} data tile ImageData
*
* @return {undefined}
*/
'protected appendTileFrame': function( set, id, data )
{
var prev = set[ id ];
set[ id ] = { data: data };
// If there is a previous frame, set the 'next' entry to its 'next'
// entry to maintain the circular reference. Otherwise, set to self.
set[ id ].next = ( prev )
? prev.next
: set[ id ];
// if there was a previous entry, set its 'next' entry to our new frame,
// expanding the linked list
prev && ( prev.next = set[ id ] )
},
/**
* Retrieve a tile with the mask applied
*

20
test/ltgloader-demo.html
View File

@ -97,15 +97,27 @@
// clear canvas to erase any previous LTG contents
ctx.clearRect( 0, 0, ctx.canvas.width, ctx.canvas.height );
var i = 0;
var i = j = 0;
for ( var tile in tiles )
{
var x = ( ( i % 10 ) * 50 ),
y = ( Math.floor( i / 10 ) * 50 );
var cur, end;
ctx.putImageData( tiles[ tile ], x, y );
// the default position is the last tile in the animation, so
// advance one before beginning output to keep consistent with the
// tile set
end = cur = tiles[ tile ].next;
do
{
var x = ( ( j % 10 ) * 50 ),
y = ( Math.floor( j / 10 ) * 50 );
ctx.putImageData( cur.data, x, y );
ctx.fillText( tile, x, ( y + 43 ), 50 );
j++;
} while ( ( cur = cur.next ) !== end )
i++;
}
} );