93 lines
2 KiB
TypeScript
93 lines
2 KiB
TypeScript
import { cls, print, spr, use_texture } from "./graphics";
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import { load_texture } from "./assets";
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import { since_start } from "./time";
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import { btn, Button } from "./input";
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import { new_v2, vadd, vmul, vnorm } from "./vector";
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/// A nice looping frame counter.
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let clock = 0;
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let bot_sprite: number | undefined = undefined;
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// Note zelda overworld is 16x8 screens
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// zelda screen is 16x11 tiles
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// from a feeling point of view this is sufficient, apparently :D
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export function init() {
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print("Hello world!");
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// Start this load, but then...
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load_texture("./bot.png").then((n) => {
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print("Bot loaded at", since_start());
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bot_sprite = n;
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});
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}
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const friction = 0.6;
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let robo_vel = new_v2(0);
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let robo_pos = new_v2(10);
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export function update() {
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clock = (clock + 1) % 20160;
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// Acceleration from input
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let a = new_v2(0);
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if (btn(Button.Up)) {
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a.y -= 1;
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}
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if (btn(Button.Down)) {
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a.y += 1;
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}
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if (btn(Button.Left)) {
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a.x -= 1;
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}
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if (btn(Button.Right)) {
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a.x += 1;
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}
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vnorm(a);
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a = vmul(a, 0.4); // Speed.
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// Friction
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let v = vmul(robo_vel, friction);
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v = vadd(v, a);
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// Zero if we're smaller than some epsilon.
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if (Math.abs(v.x) < 0.01) {
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v.x = 0;
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}
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if (Math.abs(v.y) < 0.01) {
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v.y = 0;
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}
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// Motion
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let np = vadd(robo_pos, v);
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// TODO: Collide.
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robo_pos = np;
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robo_vel = v;
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}
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// GARBAGE OBVIOUSLY
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const robo_info = {
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width: 32,
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height: 32,
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animations: [
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{ start: 0, length: 2, speed: 20 },
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{ start: 2, length: 8, speed: 8 },
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],
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};
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export function draw() {
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cls(0.1, 0.2, 0.3);
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if (bot_sprite != undefined) {
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// ...it gets resolved here?
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use_texture(bot_sprite);
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const moving = robo_vel.x != 0 || robo_vel.y != 0;
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const anim = robo_info.animations[moving ? 1 : 0];
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const frame = (anim.start + ((clock / anim.speed) % anim.length)) >> 0;
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spr(robo_pos.x, robo_pos.y, 32, 32, frame * robo_info.width, 0, 32, 32);
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}
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// print("FRAME TIME:", since_last_frame());
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}
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