jozamudi/battle-royal-tetris
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Add ghost piece preview showing where block will land

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- Add getGhostY() method to TetrisGame class (game.js)
- Add ghostY to getState() output
- Add getGhostY() helper to server (server/index.js)
- Include ghostY in getStates() broadcast
- Add drawGhostPiece() and drawGhostCell() methods (renderer.js)
- Ghost renders as semi-transparent outline at landing position
This commit is contained in:
Josue Zamudio
2026-03-20 09:37:41 -07:00
parent 708b1466d6
commit 164ed790ed
4 changed files with 62 additions and 6 deletions
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public/index.html
+6 -6
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@@ -7,7 +7,7 @@
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap" rel="stylesheet">
<link rel="stylesheet" href="css/style.css?v=6">
<link rel="stylesheet" href="css/style.css?v=7">
</head>
<body>
<div id="app">
@@ -61,10 +61,10 @@
</div>
<script src="/socket.io/socket.io.js"></script>
<script src="js/network.js?v=3"></script>
<script src="js/game.js?v=3"></script>
<script src="js/renderer.js?v=3"></script>
<script src="js/ui.js?v=3"></script>
<script src="js/app.js?v=3"></script>
<script src="js/network.js?v=4"></script>
<script src="js/game.js?v=4"></script>
<script src="js/renderer.js?v=4"></script>
<script src="js/ui.js?v=4"></script>
<script src="js/app.js?v=4"></script>
</body>
</html>
public/js/game.js
+12
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@@ -280,6 +280,16 @@ class TetrisGame {
this.dropInterval = Math.max(100, 1000 - (this.level - 1) * 100);
}
getGhostY() {
if (!this.currentPiece) return null;
let ghostY = this.currentPiece.y;
while (this.isValidPosition(this.currentPiece.x, ghostY + 1, this.currentPiece.shape)) {
ghostY++;
}
return ghostY;
}
receiveGarbage(rows) {
if (this.gameOver) return;
@@ -328,10 +338,12 @@ class TetrisGame {
}
getState() {
const ghostY = this.currentPiece ? this.getGhostY() : null;
return {
playerId: this.playerId,
board: JSON.parse(JSON.stringify(this.board)),
currentPiece: this.currentPiece ? JSON.parse(JSON.stringify(this.currentPiece)) : null,
ghostY: ghostY,
nextPiece: this.nextPiece ? JSON.parse(JSON.stringify(this.nextPiece)) : null,
holdPiece: this.holdPiece ? JSON.parse(JSON.stringify(this.holdPiece)) : null,
canHold: this.canHold,
public/js/renderer.js
+33
View File
@@ -98,6 +98,11 @@ class TetrisRenderer {
this.drawBoard(ctx, gameState.board);
}
// Draw ghost piece (landing preview)
if (gameState && gameState.currentPiece && !gameState.gameOver && gameState.ghostY !== null) {
this.drawGhostPiece(ctx, gameState.currentPiece, gameState.ghostY);
}
// Draw current piece
if (gameState && gameState.currentPiece && !gameState.gameOver) {
this.drawPiece(ctx, gameState.currentPiece);
@@ -210,6 +215,34 @@ class TetrisRenderer {
ctx.strokeRect(px, py, CELL_SIZE, CELL_SIZE);
}
drawGhostPiece(ctx, piece, ghostY) {
for (let row = 0; row < piece.shape.length; row++) {
for (let col = 0; col < piece.shape[row].length; col++) {
if (piece.shape[row][col]) {
const x = piece.x + col;
const y = ghostY + row;
if (y >= 0) {
this.drawGhostCell(ctx, x, y, piece.color);
}
}
}
}
}
drawGhostCell(ctx, x, y, color) {
const px = x * CELL_SIZE;
const py = y * CELL_SIZE;
// Semi-transparent fill with outlined border effect
ctx.strokeStyle = color + '80'; // 50% opacity border
ctx.lineWidth = 2;
ctx.strokeRect(px + 2, py + 2, CELL_SIZE - 4, CELL_SIZE - 4);
// Light fill inside
ctx.fillStyle = color + '20'; // 12.5% opacity
ctx.fillRect(px + 3, py + 3, CELL_SIZE - 6, CELL_SIZE - 6);
}
drawNextPiece(ctx, piece) {
// Clear
ctx.fillStyle = '#000';