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import * as Vec2 from 'model/vec2'
interface AccParams {
dt: number,
speed: Vec2.Vec2,
dir: Vec2.Vec2
}
// max_acc = v_length(board_size) / 90000
const maxAcc: number = 0.04
const inertia: number = 200
export function acc({ dt, speed, dir }: AccParams): Vec2.Vec2 {
const v = Vec2.applyOnLength((x) => x * maxAcc, dir)
return Vec2.div(Vec2.sub(Vec2.scale(v, dt), speed), inertia)
}
interface SpeedParams {
dt: number,
acc: Vec2.Vec2,
speed: Vec2.Vec2
}
export function speed({ dt, acc, speed }: SpeedParams): Vec2.Vec2 {
return Vec2.add(Vec2.scale(acc, dt), speed)
}
interface PosParams {
dt: number,
acc: Vec2.Vec2,
speed: Vec2.Vec2,
pos: Vec2.Vec2
}
export function pos({ dt, acc, speed, pos }: PosParams): Vec2.Vec2 {
return Vec2.add(
Vec2.scale(acc, (dt ** 2) / 2),
Vec2.add(Vec2.scale(speed, dt), pos)
)
}
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