Add combo system that tracks consecutive line clears with next piece

app/src/main/java/com/mintris/MainActivity.kt

@@ -203,6 +203,7 @@ class MainActivity : AppCompatActivity() {
         binding.scoreText.text = score.toString()
         binding.currentLevelText.text = level.toString()
         binding.linesText.text = lines.toString()
+        binding.comboText.text = gameBoard.getCombo().toString()
         
         // Force redraw of next piece preview
         binding.nextPieceView.invalidate()

app/src/main/java/com/mintris/game/TitleScreen.kt

@@ -10,6 +10,8 @@ import android.view.MotionEvent
 import android.view.View
 import java.util.Random
 import android.util.Log
+import com.mintris.model.HighScoreManager
+import com.mintris.model.HighScore
 
 class TitleScreen @JvmOverloads constructor(
     context: Context,
@@ -21,6 +23,7 @@ class TitleScreen @JvmOverloads constructor(
     private val glowPaint = Paint()
     private val titlePaint = Paint()
     private val promptPaint = Paint()
+    private val highScorePaint = Paint()
     private val cellSize = 30f
     private val random = Random()
     private var width = 0
@@ -108,6 +111,16 @@ class TitleScreen @JvmOverloads constructor(
             alpha = 180
         }
         
+        // High scores text settings
+        highScorePaint.apply {
+            color = Color.WHITE
+            textSize = 35f
+            textAlign = Paint.Align.CENTER
+            typeface = Typeface.create(Typeface.SANS_SERIF, Typeface.NORMAL)
+            isAntiAlias = true
+            alpha = 200
+        }
+        
         // General paint settings for tetrominos (white)
         paint.apply {
             color = Color.WHITE
@@ -239,8 +252,19 @@ class TitleScreen @JvmOverloads constructor(
             val titleY = height * 0.4f
             canvas.drawText("mintris", width / 2f, titleY, titlePaint)
             
+            // Draw high scores
+            val highScoreManager = HighScoreManager(context)
+            val highScores: List<HighScore> = highScoreManager.getHighScores()
+            val highScoreY = height * 0.5f
+            if (highScores.isNotEmpty()) {
+                highScores.forEachIndexed { index: Int, score: HighScore ->
+                    val y = highScoreY + (index * 35f)
+                    canvas.drawText("${index + 1}. ${score.name}: ${score.score}", width / 2f, y, highScorePaint)
+                }
+            }
+            
             // Draw "touch to start" prompt
-            canvas.drawText("touch to start", width / 2f, height * 0.6f, promptPaint)
+            canvas.drawText("touch to start", width / 2f, height * 0.7f, promptPaint)
             
             // Request another frame
             invalidate()

app/src/main/java/com/mintris/model/GameBoard.kt

@@ -37,6 +37,7 @@ class GameBoard(
     private var lastClearWasTetris = false
     private var lastClearWasPerfect = false
     private var lastClearWasAllClear = false
+    private var lastPieceClearedLines = false  // Track if the last piece placed cleared lines
     
     // Animation state
     var linesToClear = mutableListOf<Int>()
@@ -326,6 +327,18 @@ class GameBoard(
                 calculateScore(shiftAmount)
             }.start()
         }
+        
+        // Update combo based on whether this piece cleared lines
+        if (shiftAmount > 0) {
+            if (lastPieceClearedLines) {
+                combo++
+            } else {
+                combo = 1  // Start new combo
+            }
+        } else {
+            combo = 0  // Reset combo if no lines cleared
+        }
+        lastPieceClearedLines = shiftAmount > 0
     }
     
     /**
@@ -397,13 +410,6 @@ class GameBoard(
             score += finalScore
         }.start()
         
-        // Update combo counter
-        if (clearedLines > 0) {
-            combo++
-        } else {
-            combo = 0
-        }
-        
         // Update line clear state
         lastClearWasTetris = clearedLines == 4
         lastClearWasPerfect = isPerfectClear
@@ -528,6 +534,7 @@ class GameBoard(
         lastClearWasTetris = false
         lastClearWasPerfect = false
         lastClearWasAllClear = false
+        lastPieceClearedLines = false
         
         // Reset piece state
         holdPiece = null
@@ -545,4 +552,9 @@ class GameBoard(
     private fun clearLines(): Int {
         return linesToClear.size // Return the number of lines that will be cleared
     }
+    
+    /**
+     * Get the current combo count
+     */
+    fun getCombo(): Int = combo
 } 

app/src/main/res/layout/activity_main.xml

@@ -83,6 +83,15 @@
                 android:textSize="24sp"
                 android:fontFamily="sans-serif-light"
                 tools:text="Lines: 0" />
+
+            <TextView
+                android:id="@+id/comboText"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:textColor="@color/white"
+                android:textSize="24sp"
+                android:fontFamily="sans-serif-light"
+                tools:text="Combo: 0" />
         </LinearLayout>
 
         <!-- Next Piece Preview -->