phaser
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A fast, free and fun HTML5 Game Framework for Desktop and Mobile web browsers from the team at Phaser Studio Inc.
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JavaScript
/**
* @author Richard Davey <rich@phaser.io>
* @copyright 2013-2025 Phaser Studio Inc.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
var FLIPPED_HORIZONTAL = 0x80000000;
var FLIPPED_VERTICAL = 0x40000000;
var FLIPPED_ANTI_DIAGONAL = 0x20000000; // Top-right is swapped with bottom-left corners
/**
* See Tiled documentation on tile flipping:
* http://docs.mapeditor.org/en/latest/reference/tmx-map-format/
*
* @function Phaser.Tilemaps.Parsers.Tiled.ParseGID
* @since 3.0.0
*
* @param {number} gid - A Tiled GID.
*
* @return {Phaser.Types.Tilemaps.GIDData} The GID Data.
*/
var ParseGID = function (gid)
{
var flippedHorizontal = Boolean(gid & FLIPPED_HORIZONTAL);
var flippedVertical = Boolean(gid & FLIPPED_VERTICAL);
var flippedAntiDiagonal = Boolean(gid & FLIPPED_ANTI_DIAGONAL);
gid = gid & ~(FLIPPED_HORIZONTAL | FLIPPED_VERTICAL | FLIPPED_ANTI_DIAGONAL);
// Parse the flip flags into something Phaser can use
var rotation = 0;
var flipped = false;
if (flippedHorizontal && flippedVertical && flippedAntiDiagonal)
{
rotation = Math.PI / 2;
flipped = true;
}
else if (flippedHorizontal && flippedVertical && !flippedAntiDiagonal)
{
rotation = Math.PI;
flipped = false;
}
else if (flippedHorizontal && !flippedVertical && flippedAntiDiagonal)
{
rotation = Math.PI / 2;
flipped = false;
}
else if (flippedHorizontal && !flippedVertical && !flippedAntiDiagonal)
{
rotation = 0;
flipped = true;
}
else if (!flippedHorizontal && flippedVertical && flippedAntiDiagonal)
{
rotation = 3 * Math.PI / 2;
flipped = false;
}
else if (!flippedHorizontal && flippedVertical && !flippedAntiDiagonal)
{
rotation = Math.PI;
flipped = true;
}
else if (!flippedHorizontal && !flippedVertical && flippedAntiDiagonal)
{
rotation = 3 * Math.PI / 2;
flipped = true;
}
else if (!flippedHorizontal && !flippedVertical && !flippedAntiDiagonal)
{
rotation = 0;
flipped = false;
}
return {
gid: gid,
flippedHorizontal: flippedHorizontal,
flippedVertical: flippedVertical,
flippedAntiDiagonal: flippedAntiDiagonal,
rotation: rotation,
flipped: flipped
};
};
module.exports = ParseGID;