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const panel = document.querySelector('aside.layout');
const svg = document.getElementById('diagram');
const arrows = Array.from(svg.querySelectorAll('.arrow'));
const preset = panel.querySelector('.control--preset select');
const controls = Array.from(panel.querySelectorAll('.control--axis'));
const steps = Array.from(panel.querySelectorAll('.control--axis > input'));
const dirs = Array.from(panel.querySelectorAll('.control--axis .dir input'));
const turnCCW = document.getElementById('turn-ccw');
const turnCW = document.getElementById('turn-cw');
let state = [ 7, 2, null ];
let last = 0;
let selected = null;
let rot = 0;
let targetRot = 30;
const completeState = ([a, b, c]) => {
if (a == null) {
a = b - c;
} else if (b == null) {
b = c + a;
} else {
c = b - a;
}
return [a, b, c, -a, -b, -c];
};
const PRESETS = {
'wicki-hayden': [ 7, 2, null ],
'janko': [ 1, 2, null ],
'harmonic': [ 7, 4, null ],
'gerhard': [ 4, 3, null ],
};
const updateValues = () => {
const full = completeState(state);
full.forEach((val, i) => {
arrows[i].querySelector('text').textContent = val;
if (i < steps.length) steps[i].value = Math.abs(val);
if (i < dirs.length) {
dirs[i].checked = val < 0;
dirs[i].disabled = val == 0;
}
});
const presetName = Object.keys(PRESETS).find(k => completeState(PRESETS[k]).join(',') === full.join(','));
preset.value = presetName ?? 'custom';
updateFocus();
};
const updateFocus = () => {
const full = completeState(state);
controls.forEach((control, i) => {
let className = 'control control--axis';
if (state[i] == null) className += ' driven';
else if (i == selected) className += ' selected';
if (state[i] == 0) className += ' dir-disabled';
control.className = className;
});
full.forEach((val, i) => {
const positive = val > 0 || (val == 0 && i < 3);
let className = 'arrow';
if (state[i%3] == null) className += ' driven';
if (!positive) className += ' negative';
if (i%3 == selected) className += ' selected';
arrows[i].className.baseVal = className;
});
};
const select = (i) => {
if (state[i] != null) return false;
const newState = [null, null, null];
newState[i] = completeState(state)[i];
newState[last] = state[last];
state = newState;
last = i;
return true;
};
export const turn = (dir) => {
targetRot += dir * 30;
}
arrows.forEach((arrow, i) => {
arrow.onclick = () => steps[i%3].focus();
});
controls.forEach((control, i) => {
control.addEventListener('focusin', () => { selected = i; select(i); updateFocus(); });
control.addEventListener('focusout', () => { selected = null; updateFocus(); });
});
steps.forEach((input, i) => {
input.onchange = () => {
select(i);
state[i] = +input.value;
if (dirs[i].checked) state[i] = -state[i];
updateValues();
};
});
dirs.forEach((input, i) => {
input.onchange = () => {
select(i);
state[i] = state[i] * -1;
updateValues();
};
});
preset.onchange = () => {
const nextState = PRESETS[preset.value];
if (nextState) {
state = nextState.slice();
last = state.findIndex(s => s != null);
updateValues();
}
};
preset.value = 'wicki-hayden';
preset.onchange();
turnCCW.onclick = () => turn(-1);
turnCW.onclick = () => turn(1);
export const update = () => {
const delta = targetRot - rot;
if (Math.abs(delta) < 1) rot = targetRot;
else rot += delta * 0.1;
if (rot < 60 && rot > -60) return;
const full = completeState(state);
let driven = state.indexOf(null);
// cw rotation
while (rot >= 60) {
rot -= 60;
targetRot -= 60;
full.unshift(full.pop());
driven++;
}
// cw rotation
while (rot <= -60) {
rot += 60;
targetRot += 60;
full.push(full.shift());
driven = (driven-1+3) % 3;
}
state = full.slice(0, 3);
state[driven%3] = null;
updateValues();
};
export const getSteps = () => completeState(state);
export const getRot = () => rot / 180 * Math.PI;
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