Scale Simon Says and Tic-Tac-Toe to fill screen

simon_says.lua:
- Removed hardcoded button positions
- Added get_buttons() function that calculates button size and position based on screen dimensions
- Buttons now use 10% screen padding and scale to fill available width
- 2x2 grid automatically scales with screen size

tic_tac_toe.lua:
- Replaced hardcoded CELL_SIZE with dynamic calculation
- Added get_cell_size() to compute size based on screen width
- Added get_grid_start_x/y() to center grid both horizontally and vertically
- Grid now scales to fill available space while maintaining 3x3 layout
- All cell positions updated to use dynamic functions

Both games now work on any screen size and scale proportionally.

games/lua_examples/simon_says.lua

@@ -8,18 +8,22 @@ local STATE_SHOWING = 2
 local STATE_GAME_OVER = 3
 
 -- Game constants
-local BUTTON_SIZE = 40
-local BUTTON_SPACING = 10
 local SHOW_DURATION = 30  -- Frames to show each button
 local WAIT_DURATION = 20  -- Frames between shows
 
--- Button positions (4 buttons in grid)
-local BUTTONS = {
-    {x = 20, y = 20, color = 1},      -- Top-left
-    {x = 80, y = 20, color = 2},      -- Top-right
-    {x = 20, y = 80, color = 3},      -- Bottom-left
-    {x = 80, y = 80, color = 4}       -- Bottom-right
-}
+-- Button positions (calculated dynamically based on screen size)
+local function get_buttons()
+    local padding = math.floor(game.width() / 10)
+    local button_size = math.floor((game.width() - padding * 3) / 2)
+    local spacing = padding
+    
+    return {
+        {x = padding, y = padding, size = button_size, color = 1},           -- Top-left
+        {x = padding + button_size + spacing, y = padding, size = button_size, color = 2},  -- Top-right
+        {x = padding, y = padding + button_size + spacing, size = button_size, color = 3},  -- Bottom-left
+        {x = padding + button_size + spacing, y = padding + button_size + spacing, size = button_size, color = 4}  -- Bottom-right
+    }
+end
 
 function init()
     game.vars.state = STATE_MENU
@@ -140,6 +144,7 @@ function draw()
     renderer.clear(false)  -- Black background
     
     local state = game.vars.state
+    local buttons = get_buttons()
     
     if state == STATE_MENU then
         renderer.text(game.width() / 2 - 40, game.height() / 2 - 40, "SIMON SAYS", true)
@@ -149,9 +154,9 @@ function draw()
     else
         -- Draw buttons with highlight
         for i = 1, 4 do
-            local btn = BUTTONS[i]
+            local btn = buttons[i]
             local filled = (game.vars.show_button == i)
-            renderer.rect(btn.x, btn.y, BUTTON_SIZE, BUTTON_SIZE, true, filled)
+            renderer.rect(btn.x, btn.y, btn.size, btn.size, true, filled)
         end
         
         -- Draw score
@@ -170,10 +175,11 @@ function draw()
 end
 
 function get_button_at(x, y)
+    local buttons = get_buttons()
     for i = 1, 4 do
-        local btn = BUTTONS[i]
-        if x >= btn.x and x < btn.x + BUTTON_SIZE and
-           y >= btn.y and y < btn.y + BUTTON_SIZE then
+        local btn = buttons[i]
+        if x >= btn.x and x < btn.x + btn.size and
+           y >= btn.y and y < btn.y + btn.size then
             return i
         end
     end