add main.js & main.html
This commit is contained in:
Colin McMillen
parent
89cfccf433
commit
3cd1b66965
33
main.html
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33
main.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>snej</title>
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<style>
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* { padding: 0; margin: 0; }
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body { background: black; color: white; font-family: monospace; }
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div { text-align: center; }
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canvas {
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background: magenta;
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display: block;
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margin: 0 auto;
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margin-top: 8px;
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margin-bottom: 8px;
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padding: 1px;
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image-rendering: pixelated;
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}
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</style>
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</head>
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<body>
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<!-- SNES resolution: 256x224. 4x scaled: 1024 x 896. -->
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<canvas id="canvas" width="256" height="224"></canvas>
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<div id="debug"></div>
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<button id="1x">1x</button>
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<button id="2x">2x</button>
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<button id="3x">3x</button>
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<button id="4x">4x</button>
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<button id="5x">5x</button>
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<script src="main.js"></script>
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</body>
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</html>
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254
main.js
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254
main.js
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class Input {
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constructor() {
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this.left = false;
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this.right = false;
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this.up = false;
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this.down = 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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}
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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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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.left = gamepad.axes[0] < 0;
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this.right = gamepad.axes[0] > 0;
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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.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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const input = new Input();
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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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}
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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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gfx.text('FPS: ' + Math.round(this.fps), 8, 16, 16, 'yellow');
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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.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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}
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draw(gfx) {
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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 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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gfx.fill('black');
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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(4);
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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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