From bba8e32fb78b34237752702809cdb98931443371 Mon Sep 17 00:00:00 2001
From: Chris Wanstrath <chris@ozmm.org>
Date: Sun, 28 Sep 2025 23:42:13 -0700
Subject: [PATCH] more tetris

---
 app/nose/bin/tetris.ts | 83 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 74 insertions(+), 9 deletions(-)

diff --git a/app/nose/bin/tetris.ts b/app/nose/bin/tetris.ts
index daca53d..1201b28 100644
--- a/app/nose/bin/tetris.ts
+++ b/app/nose/bin/tetris.ts
@@ -9,12 +9,17 @@ const ROWS = 20
 const CELL = 25
 const DOWN_TICK = 10
 const MOVE_TICK = 3
+const TETRIS_FRAMES = 5
 
-let player: { x: number, y: number, shape: string, rotation: number }
+type Shape = { x: number, y: number, shape: string, rotation: number }
+
+let player: Shape
 let grid: string[][] = []
 let dead = false
 let downTick = 0
 let moveTick = 0
+let tetrisRows: number[] = []
+let tetrisTimer = 0
 
 const COLORS: Record<string, string> = {
   I: "cyan",
@@ -148,6 +153,22 @@ export function init() {
   dead = false
   downTick = 0
   moveTick = 0
+  tetrisTimer = TETRIS_FRAMES
+  tetrisRows.length = 0
+  grid.length = 0
+
+  grid[ROWS - 1] = [
+    "magenta",
+    "magenta",
+    "magenta",
+    "magenta",
+    "",
+    "magenta",
+    "magenta",
+    "magenta",
+    "magenta",
+    "magenta",
+  ]
 
   player = newShape()
 }
@@ -182,6 +203,17 @@ export function update(_delta: number, input: InputState) {
       }
     }
 
+    if (tetrisRows.length > 0) {
+      tetrisTimer--
+      if (tetrisTimer <= 0) {
+        removeTetrisRows()
+        tetrisRows = []
+      }
+    } else if (anyFullRows()) {
+      tetrisRows = findFullRows()
+      tetrisTimer = TETRIS_FRAMES
+    }
+
     if (hit) {
       const shape = SHAPES[player.shape]![player.rotation]!
       for (const row in shape) {
@@ -197,7 +229,6 @@ export function update(_delta: number, input: InputState) {
         }
       }
 
-
       player = newShape()
     }
   }
@@ -232,7 +263,9 @@ export function draw(game: GameContext) {
   // draw board
   for (let row = 0; row < ROWS; row++) {
     for (let col = 0; col < COLS; col++) {
-      drawBlock(game, col, row, grid[row]?.[col] || "gray")
+      let color = grid[row]?.[col] || "gray"
+      if (tetrisRows.includes(row)) color = "white"
+      drawBlock(game, col, row, color)
     }
   }
 
@@ -258,15 +291,47 @@ export function draw(game: GameContext) {
   }
 }
 
-function newShape() {
+function newShape(): Shape {
   const shape = randomElement(Object.keys(SHAPES))!
-  const newShape = { x: 3, y: 0, shape, rotation: randomIndex(SHAPES[shape]!)! }
-  // const shape = SHAPES["O"]
-  // const newShape = { x: 3, y: 0, shape, rotation: randomIndex(SHAPES[shape]!)! }
-  console.log("new shape", newShape)
-  return newShape
+  return { x: 3, y: 0, shape, rotation: randomIndex(SHAPES[shape]!)! }
 }
 
+function anyFullRows(): boolean {
+  return findFullRows().length > 0
+}
+
+function findFullRows(): number[] {
+  const rows: number[] = []
+  for (let y = 0; y < ROWS; y++) {
+    let full = true
+    for (let x = 0; x < COLS; x++) {
+      if (!grid[y]?.[x]) {
+        full = false
+        break
+      }
+    }
+    if (full) rows.push(y)
+  }
+  return rows
+}
+
+
+function removeTetrisRows() {
+  const newGrid: string[][] = []
+
+  for (let y = 0; y < ROWS; y++)
+    if (!tetrisRows.includes(y))
+      newGrid.push(grid[y] ?? [])
+
+  // add empty rows on top to restore height
+  while (newGrid.length < ROWS)
+    newGrid.unshift([])
+
+  grid = newGrid
+  tetrisRows = []
+}
+
+
 function drawBlock(game: GameContext, x: number, y: number, color: string) {
   game.rectfill(
     x * CELL,