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import * as Number from 'util/number'
import * as Size from 'model/size'
export interface Vec2 {
x: number,
y: number,
}
export const zero: Vec2 = {
x: 0,
y: 0,
}
export function equals(v1: Vec2, v2: Vec2): boolean {
return v1.x === v2.x && v1.y === v2.y
}
export function length(v: Vec2): number {
return Math.sqrt(v.x ** 2 + v.y ** 2)
}
export function normalize(v: Vec2): Vec2 {
if (v.x === 0 && v.y === 0) {
return zero
} else {
const im = 1 / length(v)
return {
x: v.x * im,
y: v.y * im
}
}
}
export function applyOnLength(f: (n: number) => number, v: Vec2): Vec2 {
return scale(normalize(v), f(length(v)))
}
export function sub(v1: Vec2, v2: Vec2): Vec2 {
return {
x: v1.x - v2.x,
y: v1.y - v2.y
}
}
export function div(v: Vec2, k: number): Vec2 {
return {
x: v.x / k,
y: v.y / k
}
}
export function add(v1: Vec2, v2: Vec2): Vec2 {
return {
x: v1.x + v2.x,
y: v1.y + v2.y
}
}
export function scale(v: Vec2, k: number): Vec2 {
return {
x: v.x * k,
y: v.y * k
}
}
export function clamp(v: Vec2, vMin: Vec2, vMax: Vec2): Vec2 {
return {
x: Number.clamp(v.x, vMin.x, vMax.x),
y: Number.clamp(v.y, vMin.y, vMax.y)
}
}
export function project(from: Size.Size, to: Size.Size, v: Vec2): Vec2 {
return {
x: v.x / from.width * to.width,
y: v.y / from.height * to.height
}
}
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