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84 lines
1.7 KiB
84 lines
1.7 KiB
# Snake Game
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Design a snake game that is to be played in web browser.
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Client: React + Redux
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Rendering:
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Pixel-based graphics. Depending on the intended resolution, can divide the screen into N \* M pixels. Can dynamically calculate the size of each pixel.
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Fruit: One pixel.
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Snake body: One pixel width made up of connected pixels.
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Model:
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```js
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{
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fruit: {
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x, y
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},
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snake: {
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points: [(x, y), ...] # head is at index 0
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direction: north/south/east/west
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}
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speed: 500,
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points: 0
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}
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```
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```js
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function update() {
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next_loc = points[0] + (x, y) # Depends on the direction
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if (snake.points.find(next_loc) > 0) {
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// die
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}
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let pts = snake.points;
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if (!isEqual(next_loc, fruit)) {
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pts = points.removeLast();
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} else {
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generateFruit();
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points++;
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}
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snake.points = [next_loc, ...pts];
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// Boundary checking -> die
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}
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```
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```js
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function generateFruit() {
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// Cannot generate on my own body.
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// First approach: while on body, generate
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let next_fruit_location = random_location();
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while (snake.points.find(next_fruit_location) > 0) {
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next_fruit_location = random_location();
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}
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fruit = next_fruit_location;
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// Second approach: brute force
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for (let i = 0; i < rows; i++) {
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for (let j = 0; j < cols; j++) {
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let point = { x: i, y: j };
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if (snake.points.find(next_fruit_location) === -1) {
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fruit = point;
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}
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}
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}
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// Third approach: brute force with random
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const available_points = [];
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for (let i = 0; i < rows; i++) {
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for (let j = 0; j < cols; j++) {
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let point = { x: i, y: j };
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if (snake.points.find(next_fruit_location) === -1) {
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available_points.push(point);
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}
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}
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}
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fruit = _.sample(available_points);
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}
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setInterval(update, speed);
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```
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