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Improve JS performance and fix draw order bug #112

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Improve JS performance and fix draw order bug #112

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32 changes: 7 additions & 25 deletions www/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -130,32 +130,14 @@ const drawCells = () => {
const cells = new Uint8Array(memory.buffer, cellsPtr, width * height);

ctx.beginPath();

// Alive cells.
ctx.fillStyle = ALIVE_COLOR;
for (let row = 0; row < height; row++) {
for (let col = 0; col < width; col++) {
const idx = getIndex(row, col);
if (cells[idx] !== Cell.Alive) {
continue;
}

ctx.fillRect(
col * (CELL_SIZE + 1) + 1,
row * (CELL_SIZE + 1) + 1,
CELL_SIZE,
CELL_SIZE
);
}
}

// Dead cells.
ctx.fillStyle = DEAD_COLOR;

for (let row = 0; row < height; row++) {
for (let col = 0; col < width; col++) {
const idx = getIndex(row, col);
if (cells[idx] !== Cell.Dead) {
continue;
if (cells[idx] === Cell.Alive) {
ctx.fillStyle = ALIVE_COLOR;
} else if(cells[idx] === Cell.Dead) {
ctx.fillStyle = DEAD_COLOR;
}

ctx.fillRect(
Expand Down Expand Up @@ -183,9 +165,9 @@ canvas.addEventListener("click", event => {
const col = Math.min(Math.floor(canvasLeft / (CELL_SIZE + 1)), width - 1);

universe.toggle_cell(row, col);

drawCells();

drawGrid();
drawCells();
});

play();