Type Alias Vector2

A pair of numbers [x, y] representing for example:

• position in 2D space
• width and height
• velocity

See Vec2 for full library.

Note that mutating Vector2 is allowed, but discouraged except for memory-demanding situations.

1. Setting position[0] has clunky syntax compared to the library
2. Any references to position will change their value.

Examples

Constructing a Vector2

const onionSize: Vector2 = [width, height];
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Deconstructing a Vector2

const [width, height] = onionSize;
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Making math less repetitive.

x += dx * speed;
y += dy * speed;
// becomes...
pos = Vec2.add(pos, Vec2.mul(delta, speed))
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Summing an array of Vector2

const vecs: Vector2[] = [[50, 100], [-5, -5], [0, 99]];
const sum = vecs.reduce(Vec2.add);
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Using LIKE graphics API

// Draw a circle in the center of the canvas.
const pos = Vec2.div(
  like.canvas.getSize(),
  2,
)
like.graphics.circle('fill', 'blue', pos, 20); 
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Getting the bounding box of an array of Vector2s

const upperLeft = myVector2List.reduce(Vec2.min);
const lowerRight = myVector2List.reduce(Vec2.max);
const boundingBox = Rect.fromPoints(upperLeft, lowerRight);
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Squaring each element of a Vector2

const squareVec2 = Vec2.map(a: number => a**2);
squareVec2([6, 7]) // returns [36, 49]
// one in one line...
Vec2.map(a: number => a**2)([6, 7]);
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