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import { render } from './render.js';
const X_START = '0.7t+sin(t)-6';
const Y_START = '0.7t-6';
const PATH_LEN = 20;
const PATH_STEP = PATH_LEN/1000;
const SLOW_RAMP = 1;
const FAST_RAMP = 0.01;
export function setupLevel(resources, home) {
const level = {
resources: resources.map(position => ({ position, collected: false })),
home,
running: false,
completed: false,
index: 0,
equations: {
x: math.compile(X_START),
y: math.compile(Y_START),
},
};
level.path = computePath(level.equations);
return level;
}
export function setupLevelUi(level, root, audio) {
const ui = { audio };
ui.resourceAudio = document.getElementById('sfx-resource');
ui.resourceSource = audio.createMediaElementSource(ui.resourceAudio);
ui.resourceSource.connect(audio.destination);
ui.doneAudio = document.getElementById('sfx-done');
ui.doneSource = audio.createMediaElementSource(ui.doneAudio);
ui.doneSource.connect(audio.destination);
ui.wrongAudio = document.getElementById('sfx-wrong');
ui.wrongSource = audio.createMediaElementSource(ui.wrongAudio);
ui.wrongSource.connect(audio.destination);
ui.launchButton = document.createElement('input');
ui.launchButton.type = 'button';
ui.launchButton.value = 'Launch';
ui.launchButton.onclick = () => {
ui.message.innerText = '';
level.running = false;
setTimeout(() => { level.running=true; stepLevel(ui, level, 0); }, 20);
}
ui.xeq = document.createElement('input');
ui.xeq.value = X_START;
ui.xeq.onchange = (e) => {
try {
level.equations.x = math.compile(e.target.value);
} catch(err) { }
level.running = false;
level.path = computePath(level.equations);
render(ui.ctx, level, 0);
};
ui.xeq.onkeydown = ui.xeq.onchange;
ui.xeq.onkeyup = ui.xeq.onchange;
ui.yeq = document.createElement('input');
ui.yeq.value = Y_START;
ui.yeq.onchange = (e) => {
try {
level.equations.y = math.compile(e.target.value);
} catch(err) { }
level.running = false;
level.path = computePath(level.equations);
render(ui.ctx, level, 0);
};
ui.yeq.onkeydown = ui.yeq.onchange;
ui.yeq.onkeyup = ui.yeq.onchange;
ui.message = document.createElement('div');
ui.id = "level-message";
root.appendChild(ui.launchButton);
root.appendChild(ui.xeq);
root.appendChild(ui.yeq);
root.appendChild(ui.message);
ui.canvas = document.createElement('canvas');
ui.canvas.width = 600;
ui.canvas.height = 600;
root.appendChild(ui.canvas);
ui.ctx = ui.canvas.getContext('2d');
ui.ctx.translate(ui.canvas.width/2, ui.canvas.height/2)
ui.ctx.scale(ui.canvas.width/20, -ui.canvas.height/20);
render(ui.ctx, level, 0);
return ui;
}
function stepLevel(ui, level, index) {
render(ui.ctx, level, index);
const pos = level.path[index];
const distances = level.resources
.map((x, i) => [x, i])
.filter(([x, _]) => x.collected === false)
.map(([x, i]) => [ distance(pos, x.position), i ])
.forEach(([d, i]) => {
if (d < 0.4) {
ui.resourceAudio.load();
ui.resourceAudio.play();
level.resources[i].collected = true;
}
});
if (distance(pos, level.home) < 0.4) {
level.running = false;
finishLevel(ui, level);
render(ui.ctx, level, 0);
} else if (level.running && index < level.path.length-1) {
setTimeout(() => stepLevel(ui, level, index+1), 1);
} else {
level.running = false;
render(ui.ctx, level, 0);
}
}
function computePath(equations, start, end, step) {
try {
const ts = [...Array(Math.floor((PATH_LEN)/PATH_STEP)).keys()].map(k => PATH_STEP * k);
return ts.map(t => [ equations.x.eval({t}), equations.y.eval({t}) ]);
} catch (err) {
return [ [0, 0] ];
}
}
function distance(p1, p2) {
const [x1, y1] = p1;
const [x2, y2] = p2;
return Math.sqrt((x2-x1)**2 + (y2-y1)**2);
}
function finishLevel(ui, level) {
const uncollected = level.resources.reduce((acc, { collected }) => acc + (collected ? 0 : 1), 0);
if (uncollected > 0) {
ui.wrongAudio.load();
ui.wrongAudio.play();
ui.message.innerText = 'resources remaining!';
} else {
ui.doneAudio.load();
ui.doneAudio.play();
ui.message.innerText = 'mission complete!';
level.completed = true;
}
level.resources.forEach(x => x.collected = false);
}
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