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Comments for some private functions in TiledImage.

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This commit is contained in:
Ryan Lester 2016-09-05 19:27:18 -04:00
parent 36aa63361d
commit b4d0104206
1 changed files with 147 additions and 3 deletions
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150
src/tiledimage.js
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@ -896,7 +896,13 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
};
},
// private
/**
* @private
* @inner
* Pretty much every other line in this needs to be documented so it's clear
* how each piece of this routine contributes to the drawing process. That's
* why there are so many TODO's inside this function.
*/
_updateViewport: function() {
this._needsDraw = false;
this._tilesLoading = 0;
@ -1042,6 +1048,21 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
}
});
/**
* @private
* @inner
* Updates all tiles at a given resolution level.
* @param {OpenSeadragon.TiledImage} tiledImage - Which TiledImage is being drawn.
* @param {Boolean} haveDrawn
* @param {Boolean} drawLevel
* @param {Number} level
* @param {Number} levelOpacity
* @param {Number} levelVisibility
* @param {OpenSeadragon.Point} viewportTL - The index of the most top-left visible tile.
* @param {OpenSeadragon.Point} viewportBR - The index of the most bottom-right visible tile.
* @param {Number} currentTime
* @param {OpenSeadragon.Tile} best - The current "best" tile to draw.
*/
function updateLevel(tiledImage, haveDrawn, drawLevel, level, levelOpacity,
levelVisibility, drawArea, currentTime, best) {
@ -1125,7 +1146,24 @@ function updateLevel(tiledImage, haveDrawn, drawLevel, level, levelOpacity,
return best;
}
function updateTile( tiledImage, drawLevel, haveDrawn, x, y, level, levelOpacity, levelVisibility, viewportCenter, numberOfTiles, currentTime, best){
/**
* @private
* @inner
* Update a single tile at a particular resolution level.
* @param {OpenSeadragon.TiledImage} tiledImage - Which TiledImage is being drawn.
* @param {Boolean} haveDrawn
* @param {Boolean} drawLevel
* @param {Number} x
* @param {Number} y
* @param {Number} level
* @param {Number} levelOpacity
* @param {Number} levelVisibility
* @param {OpenSeadragon.Point} viewportCenter
* @param {Number} numberOfTiles
* @param {Number} currentTime
* @param {OpenSeadragon.Tile} best - The current "best" tile to draw.
*/
function updateTile( tiledImage, haveDrawn, drawLevel, x, y, level, levelOpacity, levelVisibility, viewportCenter, numberOfTiles, currentTime, best){
var tile = getTile(
x, y,
@ -1219,6 +1257,21 @@ function updateTile( tiledImage, drawLevel, haveDrawn, x, y, level, levelOpacity
return best;
}
/**
* @private
* @inner
* Obtains a tile at the given location.
* @param {Number} x
* @param {Number} y
* @param {Number} level
* @param {OpenSeadragon.TileSource} tileSource
* @param {Object} tilesMatrix - A '3d' dictionary [level][x][y] --> Tile.
* @param {Number} time
* @param {Number} numTiles
* @param {Number} worldWidth
* @param {Number} worldHeight
* @returns {OpenSeadragon.Tile}
*/
function getTile( x, y, level, tileSource, tilesMatrix, time, numTiles, worldWidth, worldHeight ) {
var xMod,
yMod,
@ -1264,6 +1317,14 @@ function getTile( x, y, level, tileSource, tilesMatrix, time, numTiles, worldWid
return tile;
}
/**
* @private
* @inner
* Dispatch a job to the ImageLoader to load the Image for a Tile.
* @param {OpenSeadragon.TiledImage} tiledImage
* @param {OpenSeadragon.Tile} tile
* @param {Number} time
*/
function loadTile( tiledImage, tile, time ) {
tile.loading = true;
tiledImage._imageLoader.addJob({
@ -1278,6 +1339,16 @@ function loadTile( tiledImage, tile, time ) {
});
}
/**
* @private
* @inner
* Callback fired when a Tile's Image finished downloading.
* @param {OpenSeadragon.TiledImage} tiledImage
* @param {OpenSeadragon.Tile} tile
* @param {Number} time
* @param {Image} image
* @param {String} errorMsg
*/
function onTileLoad( tiledImage, tile, time, image, errorMsg ) {
if ( !image ) {
$.console.log( "Tile %s failed to load: %s - error: %s", tile, tile.url, errorMsg );
@ -1320,6 +1391,14 @@ function onTileLoad( tiledImage, tile, time, image, errorMsg ) {
}
}
/**
* @private
* @inner
* @param {OpenSeadragon.TiledImage} tiledImage
* @param {OpenSeadragon.Tile} tile
* @param {Image} image
* @param {Number} cutoff
*/
function setTileLoaded(tiledImage, tile, image, cutoff) {
var increment = 0;
@ -1370,6 +1449,16 @@ function setTileLoaded(tiledImage, tile, image, cutoff) {
getCompletionCallback()();
}
/**
* @private
* @inner
* @param {OpenSeadragon.Tile} tile
* @param {Boolean} overlap
* @param {OpenSeadragon.Viewport} viewport
* @param {OpenSeadragon.Point} viewportCenter
* @param {Number} levelVisibility
* @param {OpenSeadragon.TiledImage} tiledImage
*/
function positionTile( tile, overlap, viewport, viewportCenter, levelVisibility, tiledImage ){
var boundsTL = tile.bounds.getTopLeft();
@ -1400,7 +1489,23 @@ function positionTile( tile, overlap, viewport, viewportCenter, levelVisibility,
tile.visibility = levelVisibility;
}
/**
* @private
* @inner
* Updates the opacity of a tile according to the time it has been on screen
* to perform a fade-in.
* Updates coverage once a tile is fully opaque.
* Returns whether the fade-in has completed.
*
* @param {OpenSeadragon.TiledImage} tiledImage
* @param {OpenSeadragon.Tile} tile
* @param {Number} x
* @param {Number} y
* @param {Number} level
* @param {Number} levelOpacity
* @param {Number} currentTime
* @returns {Boolean}
*/
function blendTile( tiledImage, tile, x, y, level, levelOpacity, currentTime ){
var blendTimeMillis = 1000 * tiledImage.blendTime,
deltaTime,
@ -1441,6 +1546,12 @@ function blendTile( tiledImage, tile, x, y, level, levelOpacity, currentTime ){
* Note that out-of-bounds tiles provide coverage in this sense, since
* there's no content that they would need to cover. Tiles at non-existent
* levels that are within the image bounds, however, do not.
*
* @param {Object} coverage - A '3d' dictionary [level][x][y] --> Boolean.
* @param {Number} level - The resolution level of the tile.
* @param {Number} x - The X position of the tile.
* @param {Number} y - The Y position of the tile.
* @returns {Boolean}
*/
function providesCoverage( coverage, level, x, y ) {
var rows,
@ -1480,6 +1591,12 @@ function providesCoverage( coverage, level, x, y ) {
* Returns true if the given tile is completely covered by higher-level
* tiles of higher resolution representing the same content. If neither x
* nor y is given, returns true if the entire visible level is covered.
*
* @param {Object} coverage - A '3d' dictionary [level][x][y] --> Boolean.
* @param {Number} level - The resolution level of the tile.
* @param {Number} x - The X position of the tile.
* @param {Number} y - The Y position of the tile.
* @returns {Boolean}
*/
function isCovered( coverage, level, x, y ) {
if ( x === undefined || y === undefined ) {
@ -1498,6 +1615,12 @@ function isCovered( coverage, level, x, y ) {
* @private
* @inner
* Sets whether the given tile provides coverage or not.
*
* @param {Object} coverage - A '3d' dictionary [level][x][y] --> Boolean.
* @param {Number} level - The resolution level of the tile.
* @param {Number} x - The X position of the tile.
* @param {Number} y - The Y position of the tile.
* @param {Boolean} covers - Whether the tile provides coverage.
*/
function setCoverage( coverage, level, x, y, covers ) {
if ( !coverage[ level ] ) {
@ -1521,6 +1644,9 @@ function setCoverage( coverage, level, x, y, covers ) {
* Resets coverage information for the given level. This should be called
* after every draw routine. Note that at the beginning of the next draw
* routine, coverage for every visible tile should be explicitly set.
*
* @param {Object} coverage - A '3d' dictionary [level][x][y] --> Boolean.
* @param {Number} level - The resolution level of tiles to completely reset.
*/
function resetCoverage( coverage, level ) {
coverage[ level ] = {};
@ -1531,6 +1657,10 @@ function resetCoverage( coverage, level ) {
* @inner
* Determines whether the 'last best' tile for the area is better than the
* tile in question.
*
* @param {OpenSeadragon.Tile} previousBest
* @param {OpenSeadragon.Tile} tile
* @returns {OpenSeadragon.Tile} The new best tile.
*/
function compareTiles( previousBest, tile ) {
if ( !previousBest ) {
@ -1548,6 +1678,13 @@ function compareTiles( previousBest, tile ) {
return previousBest;
}
/**
* @private
* @inner
* Draws a TiledImage.
* @param {OpenSeadragon.TiledImage} tiledImage
* @param {OpenSeadragon.Tile[]} lastDrawn - An unordered list of Tiles drawn last frame.
*/
function drawTiles( tiledImage, lastDrawn ) {
if (lastDrawn.length === 0) {
return;
@ -1720,6 +1857,13 @@ function drawTiles( tiledImage, lastDrawn ) {
drawDebugInfo( tiledImage, lastDrawn );
}
/**
* @private
* @inner
* Draws special debug information for a TiledImage if in debug mode.
* @param {OpenSeadragon.TiledImage} tiledImage
* @param {OpenSeadragon.Tile[]} lastDrawn - An unordered list of Tiles drawn last frame.
*/
function drawDebugInfo( tiledImage, lastDrawn ) {
if( tiledImage.debugMode ) {
for ( var i = lastDrawn.length - 1; i >= 0; i-- ) {