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export const Camera = {
/**
* setCanvasResolution.
* receives a canvas and the resolution to set it to,
* then sets the width and height of that canvas.
*
* @param {Canvas} canvas
* @param {number} canvasWidth
* @param {number} canvasHeight
* @returns {undefined}
*/
setCanvasResolution(canvas, canvasWidth, canvasHeight) {
/* eslint-disable no-param-reassign */
// Set the new rounded size
canvas.style.width = canvasWidth;
canvas.style.height = canvasHeight;
// Set the resolution
canvas.width = canvasWidth;
canvas.height = canvasHeight;
/* eslint-enable no-param-reassign */
},
/**
* getCanvasData.
* This is used when initializing the game world.
* It should (generally) only be called once for each layer.
* @param {Canvas} canvas
* @returns {Object} - An object containing: context, bounds, ration, canvasWidth, canvasHeight
*/
getCanvasData(canvas) {
const bounds = canvas.getBoundingClientRect();
const ratio = bounds.width / bounds.height;
const canvasWidth = Math.round(Math.min(bounds.width, 800) * ratio);
const canvasHeight = Math.round(Math.min(bounds.height, 800));
const context = canvas.getContext('2d');
return { context, bounds, ratio, canvasWidth, canvasHeight };
},
/**
* getContextPixels.
* This returns an 2D array with the values of the alpha layer of a context.
* We use data calculated in this function to in the physics engine
* to do collision detection between actors and the terrain.
*
* @param {Object} arguments
* @param {CanvasRenderingContext2D} arguments.context - context to read the alpha pixels from
* @param {number} arguments.canvasWidth - absolute width of the canvas to process
* @param {number} arguments.canvasHeight - absolute height of the canvas to process
* @returns {Uint8Array[]}
*/
getContextPixels({ context, canvasWidth, canvasHeight }) {
const imageData = context.getImageData(0, 0, canvasWidth, canvasHeight);
const allAlpha = imageData.data
.filter((_, index) => (index + 1) % 4 === 0);
const pixels = {};
// Split them into the map for faster access
for (let i = 0; i < imageData.height; i++) {
const start = i * imageData.width;
const slice = allAlpha.slice(start, start + imageData.width);
if (slice.every((t) => t === 0)) { continue; }
pixels[i] = Uint8Array.from(allAlpha.slice(start, start + imageData.width));
}
return pixels;
},
/**
* updateViewport.
* Calculates what the new viewport should be.
*
* @param {Object} arguments
* @param {Viewport} arguments.oldViewport - old viewport which will be returned if there
* is no difference between the new and the old viewport
* @param {number} arguments.canvasWidth - absolute width of the canvas/screen
* @param {number} arguments.canvasHeight - absolute height of the canvas/screen
* @param {number} arguments.mapWidth - absolute width of the map
* @param {number} arguments.mapHeight - absolute height of the map
* @param {number} arguments.scale - an integer, 1 => no scaling
* @param {Actor} arguments.player - the player to center the viewport on
* @returns {Viewport}
*/
updateViewport({
oldViewport, player, mapWidth, mapHeight, scale, canvasWidth, canvasHeight,
}) {
const viewportWidth = canvasWidth / scale;
const viewportHeight = canvasHeight / scale;
// Constantly updating viewport
const centerx = Math.round((player.x + player.width / 2));
const centery = Math.round((player.y + player.height / 2));
const viewport = {
x: Math.min(
Math.max(0, Math.round(centerx - viewportWidth / 2)),
mapWidth - viewportWidth,
),
y: Math.min(
Math.max(0, Math.round(centery - viewportHeight / 2)),
mapHeight - viewportHeight,
),
width: Math.round(viewportWidth),
height: Math.round(viewportHeight),
scale,
};
if (oldViewport
&& oldViewport.x === viewport.x
&& oldViewport.y === viewport.y
&& oldViewport.width === viewport.width
&& oldViewport.height === viewport.height
&& oldViewport.scale === viewport.scale) {
return oldViewport;
}
return viewport;
},
/**
* drawScene.
* Draws an entire scene.
* This function should be called once per frame to redraw the three layers.
* @param {Object} arguments
* @param {Actor} arguments.player,
* @param {Actor[]} arguments.characters,
* @param {Actor[]} arguments.items,
* @param {Actor[]} arguments.oldItems,
* @param {CanvasRenderingContext2D} arguments.context,
* @param {number} arguments.width,
* @param {number} arguments.height,
* @param {number} arguments.sprites,
* @param {Viewport} arguments.viewport,
* @param {Viewport} arguments.oldViewport,
* @param {CanvasRenderingContext2D} arguments.layoutContext,
* @param {CanvasRenderingContext2D} arguments.aboveContext,
* @param {function} arguments.drawActorToContext,
* @returns undefined
*/
drawScene({
player,
characters,
items,
oldItems,
context,
width,
height,
sprites,
viewport,
oldViewport,
layoutContext,
aboveContext,
drawActorToContext,
}) {
if (oldViewport !== viewport || oldItems !== items) {
if (aboveContext) {
aboveContext.clearRect(0, 0, width, height);
const aboveData = sprites.above[width * viewport.scale];
aboveContext.drawImage(
aboveData.canvas,
viewport.x * viewport.scale,
viewport.y * viewport.scale,
viewport.width * viewport.scale,
viewport.height * viewport.scale,
0, 0,
viewport.width * viewport.scale,
viewport.height * viewport.scale,
);
}
const layoutData = sprites.background[width * viewport.scale];
layoutContext.drawImage(
layoutData.canvas,
viewport.x * viewport.scale,
viewport.y * viewport.scale,
viewport.width * viewport.scale,
viewport.height * viewport.scale,
0, 0,
viewport.width * viewport.scale,
viewport.height * viewport.scale,
);
// Draw Items on the background
for (let i = 0; i < items.length; i++) {
const actor = items[i];
if (actor.inInventory || actor.hidden) { continue; }
if (!Camera.isWithinViewport({ viewport, actor })) { continue; }
drawActorToContext({
context: layoutContext,
sprites,
actor,
offset: viewport,
scale: viewport.scale,
defaultSprite: 'itemSprite',
color: 'lightblue',
});
}
}
// Remove old
context.clearRect(0, 0, width, height);
// Draw new position player position
drawActorToContext({
context,
sprites,
actor: player,
offset: viewport,
scale: viewport.scale,
defaultSprite: 'characterSprite',
color: 'white',
});
for (let i = 0; i < characters.length; i++) {
const actor = characters[i];
if (!Camera.isWithinViewport({ viewport, actor })) { continue; }
// Draw new position
drawActorToContext({
context,
sprites,
actor,
offset: viewport,
scale: viewport.scale,
defaultSprite: 'characterSprite',
color: actor.color || 'darkblue',
});
}
},
/**
* drawGraph.
* Draws out a graph of areas and their connection points.
* This function is used for debugging path-finding and player movement.
* @param {Object} args
* @param {Object[]} args.graph - the graph
* @param {CanvasRenderingContext2D} args.context the context to draw to
* @param {Object} args.viewport the vewport to draw in
* @returns {undefined}
*/
drawGraph({ graph, context, viewport }) {
graph.forEach((area) => {
context.strokeStyle = 'black';
context.strokeRect(
(area.x - viewport.x) * viewport.scale,
(area.y - viewport.y) * viewport.scale,
area.width * viewport.scale,
area.height * viewport.scale,
);
context.strokeStyle = 'red';
area.points.forEach((point) => {
context.strokeRect(
(point.x - viewport.x - 1) * viewport.scale,
(point.y - viewport.y - 1) * viewport.scale,
2,
2,
);
});
});
},
/**
* drawDestinations.
* Draws all of the characters paths and
* This function is used for debugging path-finding and player movement.
* @param {Object} args
* @param {Actor[]} args.characters
* @param {CanvasRenderingContext2D} args.context
* @param {Viewport} args.viewport
* @returns {undefined}
*/
drawDestinations({ characters, context, viewport }) {
context.clearRect(0, 0, context.canvas.width, context.canvas.height);
context.fillStyle = 'black';
const colors = ['lightblue', 'red', 'yellow', 'green', 'blue', 'brown', 'purple', 'pink', 'magenta'];
characters.forEach((c) => {
context.strokeStyle = 'black';
const dest = (c.waypoints && c.waypoints[c.waypoints.length - 1]) || c.destination;
if (!dest) { return; }
context.fillRect(
(dest.x - 5 - viewport.x) * viewport.scale,
(dest.y - 5 - viewport.y) * viewport.scale,
10 * viewport.scale,
10 * viewport.scale,
);
if (!c.waypoints) { return; }
context.strokeStyle = colors[c.waypoints.length % colors.length];
context.beginPath();
context.moveTo(
(Math.round(c.x + c.width / 2) - viewport.x) * viewport.scale,
(Math.round(c.y + c.height / 2) - viewport.y) * viewport.scale,
);
context.lineTo(
(c.destination.x - viewport.x) * viewport.scale,
(c.destination.y - viewport.y) * viewport.scale,
);
c.waypoints.forEach((t) => {
context.lineTo((t.x - viewport.x) * viewport.scale, (t.y - viewport.y) * viewport.scale);
});
context.stroke();
});
},
/**
* isWithinViewport.
* Returns truy if an actor is within a viewport.
* Used to select which actors to draw.
* @param {Object} args
* @param {Viewport} args.viewport
* @param {Actor} args.actor
* @returns {boolean}
*/
isWithinViewport({ viewport, actor }) {
if (viewport.x > (actor.x + actor.width) || (viewport.x + viewport.width) < actor.x) {
return false;
}
if (viewport.y > (actor.y + actor.height) || (viewport.y + viewport.height) < actor.y) {
return false;
}
return true;
},
};
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