Initial

source/input.js

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+
+// We use the ev.code for keyboard input. This contains a string like "KeyW"
+// or "ArrowLeft", which is awkward to use, but it's keyboard layout neutral,
+// so that WASD should work with any layout.
+
+// We detect the 6th or 3rd char for each of those strings and map them to an
+// in-game button.
+
+// Movement, Action, Prev/Next, Jump
+let keymap = {
+		W: 1, p: 1, // Key[W] or ArrowU[p]
+		A: 2, e: 2, // Key[A] or ArrowL[e]ft
+		S: 3, o: 3, // Key[S] or ArrowR[i]ght
+		D: 4, i: 4, // Key[D] or ArrowD[o]wn
+		Q: 5,       // Key[Q]
+		E: 6,       // Key[E]
+		c: 9,       // KeySpa[c]e
+	},
+	keys = [
+		// Unused zeroth key, so we can test the keymap result for truthiness
+		0,
+
+		// WASD/Arrow Keys and prev next have to be set to zero, because we use 
+		// the value (0 or 1) to calculate the move direction or weapon switch
+		0,0,0,0,
+		0,0
+
+		// Following Keys (action, jump) to not have to be set here
+		// as they are just tested for truthiness
+	],
+	key_up = 1,
+	key_down = 3,
+	key_left = 2,
+	key_right = 4,
+	key_prev = 5,
+	key_next = 6,
+	key_action = 7, // ev.button = 0
+	key_jump = 9, // ev.button = 2
+	mouse_x = 0, 
+	mouse_y = 0,
+	last_wheel_event = 0;
+
+document.onkeydown = (ev) => {
+	let k = keymap[ev.code[6] || ev.code[3]];
+	if (k) {
+		ev.preventDefault();
+		keys[k] = 1;
+	}
+};
+
+document.onkeyup = (ev) => {
+	let k = keymap[ev.code[6] || ev.code[3]];
+	if (k) {
+		ev.preventDefault();
+		keys[k] = 0;
+	}
+};
+
+document.onwheel = (ev) => {
+	// Allow for one wheel event every 0.1s. This sucks, but prevents free
+	// spinning or touch scrolling mouses (eg. Apple Magic Mouse) from doing
+	// wild things.
+	if (game_time - last_wheel_event > 0.1) {
+		keys[key_prev + (ev.deltaY > 1 ? 1 : 0)] = 1;
+		last_wheel_event = game_time;
+	}
+};
+
+c.onmousemove = (ev) => {
+	mouse_x += ev.movementX;
+	mouse_y += ev.movementY;
+};
+
+c.onmousedown = (ev) => {
+	ev.preventDefault();
+	keys[key_action + ev.button] = 1;
+};
+
+c.onmouseup = (ev) => {
+	ev.preventDefault();
+	keys[key_action + ev.button] = 0;
+};
+