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export const FLIPPED_HORIZONTALLY_FLAG = 0x80000000;
export const FLIPPED_VERTICALLY_FLAG = 0x40000000;
export const FLIPPED_DIAGONALLY_FLAG = 0x20000000;
/**
* Map Module.
* Handles the loading and information gathering for tilemap.
* More information about the format imported can be found here:
* https://doc.mapeditor.org/en/stable/reference/json-map-format/
* @example
* const mapDim = Map.getTileMapDim(tilemap);
* @example
*/
export const Map = {
/**
* convertBlob.
* Converts a blob to an Image.
* We need a *loaded* image to be able to draw it to a sprite.
* When loading images dynamically, we only get them as Blobs,
* this converts them. (unfortunately not testable in NodeJS)
* https://developer.mozilla.org/en-US/docs/Web/API/Blob
*
* @param {Blob} blob
* @returns {Promise<Image>}
* @example
* const blob = await response.blob();
* await convertBlob(blob);
*/
async convertBlob(blob) {
const imageData = new Image();
imageData.src = URL.createObjectURL(blob);
return new Promise((res) => {
imageData.addEventListener('load', () => { res(imageData); });
});
},
/**
* loads images
* @param {Object} args
* @param {function} [args.fetch] - to request files from an url, defaults to (window.fetch)
* @param {function} [args.convertBlob] - to convert a blob to image
* @param {string} [args.prepend] - string to prepend to image urls (use this to set local folder)
* @param {function} args.mapJson - map information
* @returns {Promise[]} Tilesets with image data
* @example
* const loadedTilesets = await Promise.all(Map.loadImages({ mapJson: tilemap }));
*/
loadImages({
fetch = window.fetch,
mapJson,
convertBlob = Map.convertBlob,
prepend = '',
}) {
const { tilesets } = mapJson;
return tilesets.map((t) => new Promise((res) => {
fetch(prepend + t.image).then(async (response) => {
const blob = await response.blob();
res({ ...t, imageData: await convertBlob(blob) });
});
}));
},
/**
* getSpriteable.
* Convert a loaded map layer into an object that can be converted into a sprite
* @param {LoadedTileSet} l - loaded tileset, tileset with the image attached
* @param {number[]} zoomLevels - multipliers of the size individual tiles to load
* @returns {Spriteable}
* @example
* cosnt spriteable = Map.getSpriteable(loadedTileset, [1, 2]);
* const sprite = Sprite.loadSprite(spriteable, canvasProvider);
*/
getSpriteable(l, zoomLevels) {
return {
image: l.imageData,
rows: Math.ceil(l.tilecount / l.columns),
columns: l.columns,
scales: zoomLevels.map((t) => l.tilewidth * t),
padding: l.spacing,
};
},
/**
* loadTileMapSprites.
*
* @param {Object} args
* @param {LoadedTileSet[]} args.loadedTilesets - Loaded tilesets with the image attatched
* @param {function} args.canvasProvider - function that returns a new Canvas when called
* @param {number[]} args.zoomLevels - multipliers of each spriteset to load
* @returns {Object} an object with the keys set as the first guid of the respective tileset,
* and the value set to be the coresponding sprite
* @example
* const tileSprites = Map.loadTileMapSprites({
* loadedTilesets,
* canvasProvider,
* zoomLevels: [1, 2]
* });
*/
loadTileMapSprites({ loadedTilesets, canvasProvider, zoomLevels }) {
const sprites = {};
for (const set of loadedTilesets) {
sprites[set.firstgid] = Map.getSpriteable(set, zoomLevels);
}
return Sprite.loadSprites(sprites, canvasProvider);
},
/**
* getTileMapDim.
*
* @param {TileMap} tilemap
*/
getTileMapDim(tilemap) {
return {
width: tilemap.width * tilemap.tilewidth,
height: tilemap.height * tilemap.tileheight,
};
},
/**
* loadTileMapAsSpriteData.
*
* @param {}
*/
loadTileMapAsSpriteData({
tilemap, zoomLevels,
canvasWidth,
setCanvasResolution,
sprites,
canvasProvider,
only,
except,
alpha = 1,
}) {
const dim = Map.getTileMapDim(tilemap);
const spriteData = {};
for (const z of zoomLevels) {
const canvas = canvasProvider();
const width = z * dim.width;
const height = Math.round(z * dim.height);
setCanvasResolution(canvas, width, height);
const useAlpha = alpha < 1;
const context = canvas.getContext('2d', { alpha: useAlpha });
context.globalAlpha = alpha;
context.imageSmoothingEnabled = false;
Map.drawTileMapToContext({
tilemap,
context,
canvasProvider,
sprites,
zoomLevel: z,
only,
except,
});
spriteData[z * canvasWidth] = {
canvas,
parts: [{
x: 0, y: 0, width, height,
}],
};
}
return spriteData;
},
/**
* draws a map to context
*/
/**
* drawTileMapToContext.
*
* @param {}
*/
drawTileMapToContext({ tilemap, context, sprites, zoomLevel, only, except }) {
for (const layer of tilemap.layers) {
if (!layer.visible || layer.type !== 'tilelayer') { continue; }
if (only && !only.includes(layer.name)) { continue; }
if (except && except.includes(layer.name)) { continue; }
Map.drawTileLayerToContext({
layer, context, sprites, scale: zoomLevel * tilemap.tilewidth,
});
}
},
/**
* getTransformFromFlip.
*
* @param {Object} args
* @param {boolean} args.horizontally - Should flip horizontally
* @param {boolean} args.vertically - Should flip vertically
* @param {boolean} args.diagonally - Should flip diagonally
* @param {number} args.centerx - centerx to translate to (must be moved back after)
* @param {number} args.centery - centery to translate to (must be moved back after)
* @returns {Object} translation with the keys a,b,c,d,e,f
*/
getTransformFromFlip({
horizontally, vertically, diagonally, centerx, centery,
}) {
const transform = {
a: 1,
c: 0,
e: centerx,
b: 0,
d: 1,
f: centery,
};
// [x, y] * [1, 0, 0, 1] = (x + 0y), (0x + 0y)
if (horizontally) {
transform.d *= -1;
}
if (vertically) {
transform.a *= -1;
}
if (diagonally) {
const olda = transform.a;
const oldc = transform.c;
transform.a = transform.b;
transform.c = transform.d;
transform.b = olda;
transform.d = oldc;
}
return transform;
},
/**
* draws a layer to a context
*/
/**
* drawTileLayerToContext.
*
* @param {}
*/
drawTileLayerToContext({
layer, context, sprites, scale,
}) {
for (let i = 0; i < layer.data.length; i++) {
let spriteIndex = layer.data[i];
if (spriteIndex <= 0) { continue; }
// Rotation!
/* eslint-disable no-bitwise */
const horizontally = !!(spriteIndex & FLIPPED_HORIZONTALLY_FLAG);
const vertically = !!(spriteIndex & FLIPPED_VERTICALLY_FLAG);
const diagonally = !!(spriteIndex & FLIPPED_DIAGONALLY_FLAG);
const hasFlip = horizontally || vertically || diagonally;
// Bitwise operators to remove the flags
spriteIndex &= ~(
FLIPPED_HORIZONTALLY_FLAG
| FLIPPED_VERTICALLY_FLAG
| FLIPPED_DIAGONALLY_FLAG
);
/* eslint-enable no-bitwise */
const spriteDataKey = Map.findDescNumericKey(sprites, (t) => t <= spriteIndex);
spriteIndex -= spriteDataKey; // Move from absolute to relative
const spriteData = sprites[spriteDataKey][scale];
const spritePart = spriteData.parts[spriteIndex];
// If we can't find a tile, mark it
if (!spritePart) {
const x = (i % layer.height) * scale;
const y = Math.floor(i / layer.height) * scale;
context.fillStyle = 'hotpink';
context.fillRect(x, y, scale, scale);
continue;
}
const x = (i % layer.height) * scale;
const y = Math.floor(i / layer.height) * scale;
const width = scale;
const height = scale;
if (hasFlip) {
const centerx = (x + width / 2);
const centery = (y + height / 2);
const trans = Map.getTransformFromFlip({
horizontally, vertically, diagonally, centerx, centery,
});
context.setTransform(trans.a, trans.b, trans.c, trans.d, trans.e, trans.f);
context.translate(-centerx, -centery);
}
context.drawImage(spriteData.canvas,
spritePart.x, spritePart.y, spritePart.width, spritePart.height,
x, y, width, height);
context.setTransform(1, 0, 0, 1, 0, 0);
}
},
/**
* findDescNumericKey.
*
* @param {Object} obj
* @param {function} fun
*/
findDescNumericKey(obj, fun) {
const key = Object.keys(obj)
.map((t) => parseInt(t, 10))
.sort((a, b) => Math.sign(b - a))
.find(fun);
return key;
},
};
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