Creating a level in kaboomJS with a extensive tile map collisions can sometimes result in slower performance. I'm exploring options to optimize this process, such as potentially merging multiple tiles together so that a whole row of blocks could function as one large block. Do you have any suggestions for achieving this more efficiently?
In order to streamline the number of game objects within a scene, consider using a single symbol in your level definition to represent a game object that spans across multiple grid tiles. For instance, if you require platforms that are 3 grid squares wide, you can signify this with just one character instead of creating three separate objects per platform:
import kaboom from "kaboom"
// Initialize context
kaboom()
// Load assets
loadSprite("bean", "sprites/bean.png")
addLevel(
// Note: The hyphens here serve as placeholders to indicate that
// the game objects created by ➁ and ➂ occupy 2 and 3 grid squares.
[
" ⚥ ",
" ",
" ➂-- ",
" ",
" ➁- ",
" ",
" ",
"################################",
],
{
width: 32,
height: 32,
"⚥": () => [
sprite("bean"),
area(),
body(),
"player"
],
"#": () => [
rect(32, 32),
outline(2),
area(),
solid(),
],
"➁": () => [
rect(32 * 2, 32),
outline(2),
area(),
solid(),
],
"➂": () => [
rect(32 * 3, 32),
outline(2),
area(),
solid(),
],
}
);
const player = get("player")[0];
player.onUpdate(() => {
const left = isKeyDown('left') || isKeyDown('a');
const right = isKeyDown('right') || isKeyDown('d');
if (left && !right) {
player.move(-500, 0);
} else if (right && !left) {
player.move(500, 0);
}
camPos(player.pos);
});
onKeyPress("space", () => {
if (player.isGrounded()) {
player.jump();
}
});
If you have various shapes and sizes, this approach may become cumbersome.
Encountering a similar issue on a recent Kaboom project, I opted to revamp the built-in addLevel() function with a custom implementation that loaded data from a bitmap rather than strings. Furthermore, I structured the level data into a quadtree for efficient identification of chunks overlapping the visible area, allowing for dynamic loading and unloading of game objects based on visibility. The complexity of the technique and code warrants a more detailed examination, so I invite you to explore the resources provided:
Repl link, level-loader.ts source code, lib-quad-tree.ts source code, and the usage in level-one.js.
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