Auto-calculate board size

I updated GameLib for vec-xy

Dependencies/gamelib

@@ -1 +1 @@
-Subproject commit c3e921f9da474708a0f361ab5c8982f04297b155
+Subproject commit 81db0329e93f8ef802a6c162e731d63c50d7ee10

src/Main.cake

@@ -6,13 +6,31 @@
 ;; (add-cakelisp-search-directory "Dependencies/gamelib/Dependencies/cakelisp/runtime")
 (add-cakelisp-search-directory "src")
 
-(import "SDL.cake")
+(import "SDL.cake" "Math.cake")
 
 (c-import "<stdio.h>"
           "SDL.h" "SDL_syswm.h" "SDL_timer.h" "SDL_render.h")
 
-(var g-window-width int 1080)
-(var g-window-height int 2340)
+;; Made for OnePlus 6T screen
+(var g-window-width (const int) 1080)
+(var g-window-height (const int) 2340)
+(var g-window-safe-area-margin-px (const int) 40)
+
+;; Game board
+;; Note that these assume portrait aspect ratio by basing the size on the smaller dimension
+(var g-game-board-outer-size-px (const int) (- g-window-width (* 2 g-window-safe-area-margin-px)))
+(var g-game-board-outer-top-left-px (const vec2)
+     (array g-window-safe-area-margin-px (/ (- g-window-height g-game-board-outer-size-px) 2)))
+(var g-game-board-grid-size (const int) 6)
+;; Use the nearest even pixel for pixel-perfect game board
+(var g-game-board-margin-px (const int)
+     (/ (% g-game-board-outer-size-px g-game-board-grid-size) 2))
+;; With margins of 2px, that becomes 996, or 166 pixels per column
+(var g-game-board-cell-size-px (const int)
+     (/ (- g-game-board-outer-size-px g-game-board-margin-px) g-game-board-grid-size))
+(var g-game-board-inner-top-left-px (const vec2)
+     (array (+ (vec-x g-game-board-outer-top-left-px) g-game-board-margin-px)
+            (+ (vec-y g-game-board-outer-top-left-px) g-game-board-margin-px)))
 
 (define-constant DATA_DIR "data/")
 
@@ -54,13 +72,33 @@
   (return true))
 
 (defun main (&return int)
-  (printf "Kitty Gridlock\n
+  (printf "Kitty Gridlock\n\n
 Created by Macoy Madson <macoy@macoy.me>.\n
 https://macoy.me/code/macoy/kitty-gridlock\n
 Copyright (c) 2021 Macoy Madson.\n
 Licensed under GPL-3.0-or-later.\n
 Rush Hour database from Michael Fogleman.\n\n")
 
+  (printf "Window and board dimensions:\n
+\twindow width:                 %d\n
+\twindow height:                %d\n
+\twindow safe area margin px:   %d\n
+\tgame board outer size px:     %d\n
+\tgame board outer top left px: %.2f %.2f\n
+\tgame board grid size:         %d\n
+\tgame board margin px:         %d\n
+\tgame board cell size px:      %d\n
+\tgame board inner top left px: %.2f %.2f\n\n"
+          g-window-width
+          g-window-height
+          g-window-safe-area-margin-px
+          g-game-board-outer-size-px
+          (vec-xy g-game-board-outer-top-left-px)
+          g-game-board-grid-size
+          g-game-board-margin-px
+          g-game-board-cell-size-px
+          (vec-xy g-game-board-inner-top-left-px))
+
   ;;
   ;; Initialization
   ;;