Initial

src/game.nim

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+import dom, math, strformat
+
+import gamelight/[graphics, geometry, vec, utils]
+
+import libmttt
+
+type
+  Game* = ref object
+    renderer: Renderer2D
+    lastUpdate, totalTime: float
+    paused: bool
+    scene: Scene
+    state: GameState
+    timeElement: Element
+    onGameStart*: proc (game: Game)
+
+  Scene {.pure.} = enum
+    MainMenu, Game
+
+const
+  gameBgColor = "#e6e6e6"
+  font = "Helvetica, monospace"
+  padding = 10 # Padding around the game area in pixels
+
+var 
+  renderWidth, renderHeight: int ## Canvas render area in pixels
+
+proc toTimeString(milliseconds: float): string =
+  let seconds = ((milliseconds / 1000) mod 60).toInt()
+  let minutes = ((milliseconds / (1000 * 60)) mod 60).toInt()
+  let hours = ((milliseconds / (1000 * 60 * 60)) mod 24).toInt()
+  result = fmt"{hours}:{minutes}:{seconds}"
+
+proc switchScene(game: Game, scene: Scene) =
+  case scene:
+    of Scene.MainMenu:
+      discard
+    of Scene.Game:
+      var elements: seq[Element] = @[]
+
+      let timeTextPos = (padding.toFloat, padding.toFloat)
+      elements.add game.renderer.createTextElement("Time", timeTextPos, "#000000", 26, font)
+
+      let timePos = (padding.toFloat, padding.toFloat + 35.0)
+      game.timeElement = game.renderer.createTextElement("0", timePos, "#000000", 14, font)
+
+
+proc newGame*(canvasId: string, width, height: int): Game =
+  var 
+    player1 = Player(name: "Player 1")
+    player2 = Player(name: "Player 2")
+
+  renderWidth = width
+  renderHeight = height
+
+  result = Game(
+    renderer: newRenderer2D(canvasId, width, height),
+    scene: Scene.Game,
+    state: newGame(player1, player2),
+    paused: false
+  )
+  switchScene(result, Scene.Game)
+
+proc update(game: Game, time: float) =
+  # Update the game logic
+  # Return early if paused.
+  if game.paused or game.scene != Scene.Game: return
+
+  game.totalTime += time
+
+proc drawMainMenu(game: Game) =
+  discard
+
+proc drawGame(game: Game) =
+  # Draw changing UI Elements
+  game.timeElement.innerHTML = game.totalTime.toTimeString
+
+proc draw(game: Game) = 
+  # Draw the current screen on the canvas
+  # Fill background color.
+  game.renderer.fillRect(0.0, 0.0, renderWidth, renderHeight, gameBgColor)
+  case game.scene
+  of Scene.MainMenu:
+    drawMainMenu(game)
+  of Scene.Game:
+    drawGame(game)
+
+proc nextFrame*(game: Game, frameTime: float) = 
+  # Determine id an update is necessary
+  game.update(frameTime)
+  game.draw()