501 lines
13 KiB
JavaScript
501 lines
13 KiB
JavaScript
const Orientation = {
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UP: 'up',
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DOWN: 'down',
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LEFT: 'left',
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RIGHT: 'right'
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}
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// TODO: make these not global.
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let upArrowPressed = false;
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let downArrowPressed = false;
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let leftArrowPressed = false;
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let rightArrowPressed = false;
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class Input {
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constructor() {
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this.up = false;
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this.down = false;
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this.left = false;
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this.right = false;
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this.a = false;
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this.b = false;
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this.x = false;
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this.y = false;
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this.l = false;
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this.r = false;
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this.select = false;
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this.start = false;
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window.addEventListener('gamepadconnected', this.gamepadConnected);
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window.addEventListener('gamepaddisconnected', this.gamepadDisconnected);
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document.addEventListener('keydown', this.keyDown);
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document.addEventListener('keyup', this.keyUp);
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}
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keyDown(e) {
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if (e.key == 'ArrowUp' || e.key == 'w') {
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upArrowPressed = true;
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}
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if (e.key == 'ArrowDown' || e.key == 's') {
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downArrowPressed = true;
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}
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if (e.key == 'ArrowLeft' || e.key == 'a') {
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leftArrowPressed = true;
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}
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if (e.key == 'ArrowRight' || e.key == 'd') {
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rightArrowPressed = true;
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}
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}
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keyUp(e) {
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if (e.key == 'ArrowUp' || e.key == 'w') {
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upArrowPressed = false;
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}
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if (e.key == 'ArrowDown' || e.key == 's') {
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downArrowPressed = false;
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}
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if (e.key == 'ArrowLeft' || e.key == 'a') {
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leftArrowPressed = false;
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}
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if (e.key == 'ArrowRight' || e.key == 'd') {
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rightArrowPressed = false;
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}
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}
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update() {
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// TODO: have a config screen instead of hard-coding the 8Bitdo SNES30 pad.
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// TODO: handle connects / disconnects more correctly.
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this.up = upArrowPressed;
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this.down = downArrowPressed;
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this.left = leftArrowPressed;
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this.right = rightArrowPressed;
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const gamepad = navigator.getGamepads()[0];
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if (gamepad == null || !gamepad.connected || gamepad.axes.length < 2 ||
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gamepad.buttons.length < 12) {
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return;
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}
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this.up |= gamepad.axes[1] < 0;
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this.down |= gamepad.axes[1] > 0;
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this.left |= gamepad.axes[0] < 0;
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this.right |= gamepad.axes[0] > 0;
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this.a = gamepad.buttons[0].pressed;
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this.b = gamepad.buttons[1].pressed;
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this.x = gamepad.buttons[3].pressed;
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this.y = gamepad.buttons[4].pressed;
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this.l = gamepad.buttons[6].pressed;
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this.r = gamepad.buttons[7].pressed;
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this.select = gamepad.buttons[10].pressed;
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this.start = gamepad.buttons[11].pressed;
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debug(this.toString());
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}
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gamepadConnected(e) {
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debug('gamepad connected! :)');
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console.log('gamepad connected @ index %d: %d buttons, %d axes\n[%s]',
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e.gamepad.index, e.gamepad.buttons.length, e.gamepad.axes.length,
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e.gamepad.id);
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}
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gamepadDisconnected(e) {
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debug('gamepad disconnected :(');
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console.log('gamepad disconnected @ index %d:\n[%s]', e.gamepad.index,
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e.gamepad.id);
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}
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toString() {
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let result = '';
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if (this.up) {
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result += '^';
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} else if (this.down) {
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result += 'v';
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} else {
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result += '-';
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}
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if (this.left) {
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result += '<';
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} else if (this.right) {
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result += '>';
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} else {
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result += '-';
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}
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result += ' ';
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if (this.a) {
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result += 'A';
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}
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if (this.b) {
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result += 'B';
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}
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if (this.x) {
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result += 'X';
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}
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if (this.y) {
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result += 'Y';
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}
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if (this.l) {
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result += 'L';
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}
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if (this.r) {
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result += 'R';
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}
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if (this.select) {
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result += 's';
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}
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if (this.start) {
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result += 'S';
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}
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return result;
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}
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}
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class Graphics {
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constructor(canvas) {
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this.canvas_ = canvas;
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this.ctx_ = canvas.getContext('2d');
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}
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get width() {
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return this.canvas_.width;
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}
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get height() {
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return this.canvas_.height;
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}
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fill(color) {
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this.ctx_.fillStyle = color;
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this.ctx_.beginPath();
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this.ctx_.rect(0, 0, this.canvas_.width, this.canvas_.height);
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this.ctx_.fill();
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this.ctx_.closePath();
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}
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circle(x, y, radius, color) {
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this.ctx_.fillStyle = color;
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this.ctx_.beginPath();
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this.ctx_.arc(x, y, radius, 0, 2 * Math.PI)
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this.ctx_.fill();
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this.ctx_.closePath();
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}
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// TODO: replace with custom sprite-based text rendering.
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text(string, x, y, size, color) {
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this.ctx_.imageSmoothingEnabled = false;
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this.ctx_.fillStyle = color;
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this.ctx_.font = '' + size + 'px monospace';
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this.ctx_.fillText(string, x, y);
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}
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drawImage(image, dx, dy) {
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const src = image[0];
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const sx = image[1];
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const sy = image[2];
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const width = image[3];
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const height = image[4];
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this.ctx_.drawImage(
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src, sx, sy, width, height, dx, dy, width, height);
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}
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}
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class FpsCounter {
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constructor() {
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this.fps = 0;
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this.frameTimes_ = new Array(60);
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this.idx_ = 0;
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}
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update(timestampMs) {
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if (this.frameTimes_[this.idx_]) {
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const timeElapsed = (timestampMs - this.frameTimes_[this.idx_]) / 1000;
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this.fps = this.frameTimes_.length / timeElapsed;
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}
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this.frameTimes_[this.idx_] = timestampMs;
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this.idx_++;
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if (this.idx_ == this.frameTimes_.length) {
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this.idx_ = 0;
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}
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}
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draw(gfx) {
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const fpsDiv = document.getElementById('fps');
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fpsDiv.innerText = 'FPS: ' + Math.round(this.fps);
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}
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}
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class World {
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constructor() {
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this.state_ = null;
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this.fpsCounter_ = new FpsCounter();
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this.input_ = new Input();
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this.player_ = new Player();
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// TODO: move rendering stuff to a separate object.
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this.resources_ = new Resources();
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this.tileRenderer_ = new TileRenderer();
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this.playerRenderer_ = new PlayerRenderer();
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this.gamepadRenderer_ = new GamepadRenderer();
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}
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update(timestampMs) {
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this.fpsCounter_.update(timestampMs);
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this.input_.update();
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if (this.input_.left) {
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this.player_.moveLeft();
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}
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if (this.input_.right) {
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this.player_.moveRight();
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}
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if (this.input_.up) {
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this.player_.moveUp();
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}
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if (this.input_.down) {
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this.player_.moveDown();
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}
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}
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draw(gfx) {
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gfx.fill('black');
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this.tileRenderer_.draw(gfx, this.resources_.sprites);
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this.playerRenderer_.draw(gfx, this.resources_.sprites, this.player_);
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// this.gamepadRenderer_.draw(gfx, this.input_);
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this.fpsCounter_.draw(gfx);
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}
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}
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class Resources {
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constructor() {
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const atlantis = document.getElementById('atlantis');
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const ghost = document.getElementById('ghost');
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const ts = 16;
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this.sprites = {
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'ground0': [atlantis, 2 * ts, 1 * ts, 16, 16],
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'ground1': [atlantis, 3 * ts, 1 * ts, 16, 16],
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'ground2': [atlantis, 4 * ts, 1 * ts, 16, 16],
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'ground3': [atlantis, 5 * ts, 1 * ts, 16, 16],
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'ground4': [atlantis, 6 * ts, 1 * ts, 16, 16],
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'ground5': [atlantis, 7 * ts, 1 * ts, 16, 16],
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'ground6': [atlantis, 8 * ts, 1 * ts, 16, 16],
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'rock0': [atlantis, 1 * ts, 2 * ts, 16, 16],
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'rock1': [atlantis, 2 * ts, 2 * ts, 16, 16],
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'rock2': [atlantis, 3 * ts, 2 * ts, 16, 16],
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'anchor0': [atlantis, 21 * ts, 1 * ts, 16, 16],
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'seaweed0': [atlantis, 20 * ts, 2 * ts, 16, 32],
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'seaweed1': [atlantis, 16 * ts, 2 * ts, 16, 32],
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'coral0': [atlantis, 15 * ts, 9 * ts, 32, 16],
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'rockpile0': [atlantis, 17 * ts, 10 * ts, 32, 32],
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'ghostdown0': [ghost, 0, 0, 24, 36],
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'ghostdown1': [ghost, 26, 0, 24, 36],
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'ghostdown2': [ghost, 52, 0, 24, 36],
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'ghostleft0': [ghost, 0, 36, 24, 36],
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'ghostleft1': [ghost, 26, 36, 24, 36],
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'ghostleft2': [ghost, 52, 36, 24, 36],
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'ghostright0': [ghost, 0, 72, 24, 36],
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'ghostright1': [ghost, 26, 72, 24, 36],
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'ghostright2': [ghost, 52, 72, 24, 36],
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'ghostup0': [ghost, 0, 108, 24, 36],
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'ghostup1': [ghost, 26, 108, 24, 36],
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'ghostup2': [ghost, 52, 108, 24, 36],
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}
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}
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}
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class Player {
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constructor() {
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this.x = (256 - 26) / 2;
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this.y = (224 - 36) / 2;
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this.orientation = Orientation.DOWN;
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}
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moveLeft() {
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this.orientation = Orientation.LEFT;
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this.x -= 2;
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if (this.x < -4) {
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this.x = -4;
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}
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}
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moveRight() {
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this.orientation = Orientation.RIGHT;
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this.x += 2;
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if (this.x > 256 - 21) {
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this.x = 256 - 21;
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}
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}
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moveUp() {
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this.orientation = Orientation.UP;
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this.y -= 2;
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if (this.y < -7) {
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this.y = -7;
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}
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}
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moveDown() {
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this.orientation = Orientation.DOWN;
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this.y += 2;
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if (this.y > 224 - 36) {
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this.y = 224 - 36;
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}
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}
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}
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class PlayerRenderer {
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constructor() {
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this.frameNum = 0;
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}
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draw(gfx, sprites, player) {
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let spriteIndex = Math.floor((this.frameNum % 40) / 10);
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if (spriteIndex == 3) { spriteIndex = 1; }
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const spriteName = 'ghost' + player.orientation + spriteIndex;
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gfx.drawImage(sprites[spriteName], player.x, player.y);
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this.frameNum++;
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}
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}
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class TileRenderer {
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draw(gfx, sprites) {
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const tileSize = 16;
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const rows = gfx.height / tileSize;
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const columns = gfx.width / tileSize;
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const layer1 = ["-,*-...*'.,-_'`o",
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"_..'-_**,',_.'oo",
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"-*-''_-'o,0O_```",
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"o`0_._,*O'`--'-'",
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"`0O-_'',`o*o*`-,",
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"*,`'---o'O'_*''-",
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"'-.**.'_'`.,'-.'",
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".O'``*``'`*,,_o`",
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"_*_''*O'`_OO-_'o",
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"0`0,*-,`_*'`O'*.",
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".o'-*.*_',`,,`.'",
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"`o`O',.`OO,*-'**",
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"-..*'-''',*'.'.O",
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"*-_'-0.--__O`O`_",
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"*-_,O_'*'`*'_._.",
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"-.*,`OO'_`'*-0-O"];
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const layer2 = [" ",
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" ",
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" iil ",
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" ",
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" A ",
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" ",
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" ",
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" ",
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" ",
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" i ",
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" l ",
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" ",
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" c R ",
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" c "];
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const spriteLookup = {
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'.': sprites.ground0,
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',': sprites.ground1,
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'_': sprites.ground2,
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'`': sprites.ground3,
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'-': sprites.ground4,
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'*': sprites.ground5,
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"'": sprites.ground6,
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'o': sprites.rock0,
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'O': sprites.rock1,
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'0': sprites.rock2,
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'A': sprites.anchor0,
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'i': sprites.seaweed0,
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'l': sprites.seaweed1,
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'c': sprites.coral0,
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'R': sprites.rockpile0,
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};
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for (let j = 0; j < columns; j++) {
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for (let i = 0; i < rows; i++) {
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const dx = tileSize * j;
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const dy = tileSize * i;
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const sprite = spriteLookup[layer1[i][j]];
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if (sprite) {
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gfx.drawImage(sprite, dx, dy);
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}
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}
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}
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for (let j = 0; j < columns; j++) {
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for (let i = 0; i < rows; i++) {
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const dx = tileSize * j;
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const dy = tileSize * i;
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const sprite = spriteLookup[layer2[i][j]];
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if (sprite) {
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gfx.drawImage(sprite, dx, dy);
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}
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}
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}
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}
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}
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class GamepadRenderer {
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draw(gfx, input) {
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const centerX = gfx.width / 2;
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const centerY = gfx.height / 2;
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// Select & Start
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gfx.circle(centerX + 12, centerY, 8, input.start ? 'cyan' : 'grey');
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gfx.circle(centerX - 12, centerY, 8, input.select ? 'cyan' : 'grey');
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// Y X B A
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gfx.circle(centerX + 48, centerY, 8, input.y ? 'cyan' : 'grey');
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gfx.circle(centerX + 64, centerY - 16, 8, input.x ? 'cyan' : 'grey');
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gfx.circle(centerX + 64, centerY + 16, 8, input.b ? 'cyan' : 'grey');
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gfx.circle(centerX + 80, centerY, 8, input.a ? 'cyan' : 'grey');
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// dpad
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gfx.circle(centerX - 48, centerY, 8, input.right ? 'cyan' : 'grey');
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gfx.circle(centerX - 64, centerY - 16, 8, input.up ? 'cyan' : 'grey');
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gfx.circle(centerX - 64, centerY + 16, 8, input.down ? 'cyan' : 'grey');
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gfx.circle(centerX - 80, centerY, 8, input.left ? 'cyan' : 'grey');
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// L & R
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gfx.circle(centerX + 30, centerY - 32, 8, input.r ? 'cyan' : 'grey');
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gfx.circle(centerX - 30, centerY - 32, 8, input.l ? 'cyan' : 'grey');
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}
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}
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function debug(message) {
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const debugDiv = document.getElementById('debug');
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debugDiv.innerText = message;
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}
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function loop(world, gfx) {
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return timestampMs => {
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world.update(timestampMs);
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world.draw(gfx);
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window.requestAnimationFrame(loop(world, gfx));
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};
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}
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function setCanvasScale(scale) {
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const snesWidth = 256;
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const snesHeight = 224;
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const canvas = document.getElementById('canvas');
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canvas.style.width = '' + snesWidth * scale + 'px';
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canvas.style.height = '' + snesHeight * scale + 'px';
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}
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function init() {
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const world = new World();
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const gfx = new Graphics(document.getElementById('canvas'));
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document.getElementById('1x').onclick = () => setCanvasScale(1);
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document.getElementById('2x').onclick = () => setCanvasScale(2);
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document.getElementById('3x').onclick = () => setCanvasScale(3);
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document.getElementById('4x').onclick = () => setCanvasScale(4);
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document.getElementById('5x').onclick = () => setCanvasScale(5);
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setCanvasScale(3);
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window.requestAnimationFrame(loop(world, gfx));
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debug('initialized!');
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}
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init();
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