js gamedev cheat sheet

SteelGolem

Jul 9th, 2021 (edited)

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// https://developer.mozilla.org/en-US/docs/Games/Tutorials/2D_Breakout_game_pure_JavaScript
// graphics output
<canvas id="canvas" width="480" height="320"></canvas>
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
var sprite_sheet = new Image; sprite_sheet.src = "http/link/to/image.png";
context.drawImage(sprite_sheet, src_x, src_y, src_w, src_h, dest_x, dest_y, dest_w, dest_h);
// game loop timing
setInterval(game_loop, 10); // fixed interval
requestAnimationFrame(game_loop); // variable interval
function game_loop() { move_stuff(); draw_stuff(); }
// keyboard input
document.addEventListener("keydown", key_down, false);
document.addEventListener("keyup", key_up, false);
function key_down(e) { if(e.key == "Right" || e.key == "ArrowRight") key_r = true; }
function key_up(e) { if(e.key == "Right" || e.key == "ArrowRight") key_r = false; }
// mouse input
document.addEventListener("mousemove", mouse_move);
function mouse_move(e) { player_x = e.clientX - canvas.offsetLeft; }
// mousedown, mouseup, click, dblclick, wheel
// TODO: https://developer.mozilla.org/en-US/docs/Web/API/Touch_events
// sound output
// TODO: https://www.w3schools.com/graphics/game_sound.asp

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