WIP

9 files changed, 208 insertions, 49 deletions

diff --git a/src/controls.ts b/src/controls.ts
index b575b3f..8ae0dbf 100644
--- a/src/controls.ts
+++ b/src/controls.ts
@@ -3,7 +3,7 @@ export interface Controls {
   right: boolean,
   down: boolean,
   left: boolean,
-  space: boolean,
+  spaceCount: number,
 }
 
 export let current = {
@@ -11,7 +11,7 @@ export let current = {
   right: false,
   down: false,
   left: false,
-  space: false,
+  spaceCount: 0,
 }
 
 document.addEventListener('keydown', event => {
@@ -31,8 +31,8 @@ function update(current: Controls, key: string, isDown: boolean): Controls {
     return { ...current, down: isDown }
   else if (key === 'ArrowLeft')
     return { ...current, left: isDown }
-  else if (key === ' ')
-    return { ...current, space: isDown }
+  else if (key === ' ' && !isDown)
+    return { ...current, spaceCount: current.spaceCount + 1 }
   else
     return current
 }
diff --git a/src/main.ts b/src/main.ts
index 53bc487..c235929 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -9,3 +9,10 @@ function loop(timestamp: number) {
 }
 
 window.requestAnimationFrame(loop)
+
+window.onresize = () => Scene.resize(
+  scene,
+  { width: window.innerWidth,
+    height: window.innerHeight
+  }
+)
diff --git a/src/model/size.ts b/src/model/size.ts
new file mode 100644
index 0000000..5e8a778
--- /dev/null
+++ b/src/model/size.ts
@@ -0,0 +1,8 @@
+export interface Size {
+  width: number,
+  height: number,
+}
+
+export function diagonal(size: Size): number {
+  return Math.sqrt(size.width ** 2 + size.height ** 2)
+}
diff --git a/src/model/vec2.ts b/src/model/vec2.ts
index 4bec53d..46ffc7e 100644
--- a/src/model/vec2.ts
+++ b/src/model/vec2.ts
@@ -1,15 +1,78 @@
+import * as Number from 'util/number'
+import * as Size from 'model/size'
+
 export interface Vec2 {
   x: number,
   y: number,
 }
 
-export function zero(): Vec2 {
-  return {
-    x: 0,
-    y: 0,
-  }
+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
+  }
+}
diff --git a/src/screen.ts b/src/screen.ts
index 930534e..0567ad9 100644
--- a/src/screen.ts
+++ b/src/screen.ts
@@ -1,4 +1,9 @@
-let canvas = document.querySelector('canvas') as HTMLCanvasElement
+export let size = {
+  x: window.innerWidth,
+  y: window.innerHeight
+}
 
-export let width: number = canvas.width
-export let height: number = canvas.height
+window.onresize = () => {
+  size.x = window.innerWidth
+  size.y = window.innerHeight
+}
diff --git a/src/util/physics.ts b/src/util/physics.ts
new file mode 100644
index 0000000..cbc82f7
--- /dev/null
+++ b/src/util/physics.ts
@@ -0,0 +1,40 @@
+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)
+  )
+}
diff --git a/src/view/colors.ts b/src/view/colors.ts
index c663d25..725e981 100644
--- a/src/view/colors.ts
+++ b/src/view/colors.ts
@@ -1,4 +1,4 @@
-export let colors = {
+export const colors = {
   blue: "#333388",
   red: "#CC3333",
 }
diff --git a/src/view/scene.ts b/src/view/scene.ts
index fe88c12..6d35edc 100644
--- a/src/view/scene.ts
+++ b/src/view/scene.ts
@@ -1,35 +1,53 @@
 import * as Ship from 'view/ship'
 import * as Colors from 'view/colors'
-import * as Screen from 'screen'
+import * as Vec2 from 'model/vec2'
+import * as Size from 'model/size'
 
 export interface State {
+  canvas: HTMLCanvasElement,
   context: CanvasRenderingContext2D,
   timestamp: number,
   ship: Ship.State,
+  windowSize: Size.Size,
 }
 
 export function init(): State {
-  let canvas = document.querySelector('canvas') as HTMLCanvasElement
-  let context = canvas.getContext("2d") as CanvasRenderingContext2D
+  const canvas = document.querySelector('canvas') as HTMLCanvasElement
+  const context = canvas.getContext("2d") as CanvasRenderingContext2D
+  const windowSize = {
+    width: window.innerWidth,
+    height: window.innerHeight
+  }
+  canvas.width = windowSize.width
+  canvas.height = windowSize.height
 
   return {
+    canvas,
     context,
     timestamp: 0,
-    ship: Ship.init(),
+    ship: Ship.init(windowSize),
+    windowSize
   }
 }
 
 export function update(state: State, timestamp: number) {
-  let delta = timestamp - state.timestamp
+  const dt = timestamp - state.timestamp
   state.timestamp = timestamp
 
-  Ship.update(state.ship, state.timestamp, delta)
+  Ship.update(state.ship, dt, state.windowSize)
+}
+
+export function resize(state: State, size: Size.Size) {
+  Ship.project(state.ship, state.windowSize, size)
+  state.windowSize = size
+  state.canvas.width = size.width
+  state.canvas.height = size.height
 }
 
 export function view(state: State) {
   // Clear
   state.context.fillStyle = Colors.colors.blue
-  state.context.fillRect(0, 0, Screen.width, Screen.height)
+  state.context.fillRect(0, 0, state.windowSize.width, state.windowSize.height)
 
   Ship.view(state.context, state.ship)
 }
diff --git a/src/view/ship.ts b/src/view/ship.ts
index 92590d3..5a8b86f 100644
--- a/src/view/ship.ts
+++ b/src/view/ship.ts
@@ -1,51 +1,64 @@
 import * as Controls from 'controls'
 import * as Vec2 from 'model/vec2'
+import * as Size from 'model/size'
 import * as Number from 'util/number'
-import * as Screen from 'screen'
 import * as Colors from 'view/colors'
+import * as Physics from 'util/physics'
 
-export const radius: number = 30
-export const fireDelay: number = 200
 export const missileWidth: number = 10
 export const missileHeight: number = 5
 
 export interface State {
+  speed: Vec2.Vec2,
   pos: Vec2.Vec2,
+  radius: number,
   missiles: Array<Vec2.Vec2>,
   lastFired: number,
 }
 
-export function init(): State {
+export function init(windowSize: Size.Size): State {
   return {
+    speed: { x: 0, y: 0 },
     pos: {
-      x: Screen.width / 6,
-      y: Screen.height / 2,
+      x: windowSize.width / 6,
+      y: windowSize.height / 2,
     },
+    radius: Size.diagonal(windowSize) / 30,
     missiles: [],
     lastFired: 0,
   }
 }
 
-export function update(state: State, timestamp: number, delta: number) {
-  move(state, delta)
-  updateMissiles(state, timestamp, delta)
+export function update(
+  state: State,
+  dt: number,
+  windowSize: Size.Size
+) {
+  move(state, dt, windowSize)
+  updateMissiles(state, dt, windowSize)
 }
 
-function move(state: State, delta: number) {
-  let dir = controlsDir(Controls.current)
+function move(state: State, dt: number, windowSize: Size.Size) {
+  const dir = controlsDir(Controls.current)
 
-  if (!Vec2.equals(dir, Vec2.zero())) {
-    let teta = Math.atan2(dir.y, dir.x)
-    state.pos.x += Math.cos(teta) * delta / 3
-    state.pos.y += Math.sin(teta) * delta / 3
-  }
+  const unitDt = 0.5
+  const steps = Math.round(dt / unitDt)
+
+  const acc = Physics.acc({ dt, speed: state.speed, dir })
+  Array(steps).fill(1).forEach(_ => {
+    state.speed = Physics.speed({ dt: unitDt, acc, speed: state.speed })
+    state.pos = Physics.pos({ dt: unitDt, acc, speed: state.speed, pos: state.pos })
+  })
 
-  state.pos.x = Number.clamp(state.pos.x, radius, Screen.width - radius)
-  state.pos.y = Number.clamp(state.pos.y, radius, Screen.height - radius)
+  state.pos = Vec2.clamp(
+    state.pos,
+    { x: state.radius, y: state.radius },
+    { x: windowSize.width - state.radius, y: windowSize.height - state.radius }
+  )
 }
 
 function controlsDir(c: Controls.Controls): Vec2.Vec2 {
-  let dir = Vec2.zero()
+  let dir = { x: 0, y: 0 }
 
   if (c.up && !c.down)
     dir.y = -1
@@ -57,26 +70,31 @@ function controlsDir(c: Controls.Controls): Vec2.Vec2 {
   else if (c.left && !c.right)
     dir.x = -1
 
-  return dir
+  return Vec2.normalize(dir)
 }
 
-function updateMissiles(state: State, timestamp: number, delta: number) {
-  if (Controls.current.space && state.lastFired + fireDelay < timestamp) {
-    state.missiles.push({x: state.pos.x + radius, y: state.pos.y})
-    state.lastFired = timestamp
+function updateMissiles(state: State, dt: number, windowSize: Size.Size) {
+  if (Controls.current.spaceCount > state.lastFired) {
+    state.missiles.push({x: state.pos.x + state.radius, y: state.pos.y})
+    state.lastFired = Controls.current.spaceCount
   }
 
   state.missiles = state.missiles
-    .map(missile => ({ ...missile, x: missile.x + delta}))
-    .filter(missile => missile.x < Screen.width)
+    .map(missile => ({ ...missile, x: missile.x + dt}))
+    .filter(missile => missile.x < windowSize.width)
+}
+
+export function project(state: State, from: Size.Size, to: Size.Size) {
+  state.pos = Vec2.project(from, to, state.pos)
+  state.radius = state.radius / Size.diagonal(from) * Size.diagonal(to)
 }
 
 export function view(context: CanvasRenderingContext2D, state: State) {
   context.fillStyle = Colors.colors.red
   context.beginPath()
-  context.moveTo(state.pos.x - radius, state.pos.y - radius)
-  context.lineTo(state.pos.x + radius, state.pos.y)
-  context.lineTo(state.pos.x - radius, state.pos.y + radius)
+  context.moveTo(state.pos.x - state.radius, state.pos.y - state.radius)
+  context.lineTo(state.pos.x + state.radius, state.pos.y)
+  context.lineTo(state.pos.x - state.radius, state.pos.y + state.radius)
   context.closePath()
   context.fill()