function isEven(n) {
return n % 2 === 0;
}
function toFixed(n) {
return Number.parseFloat(n).toFixed(2);
}
function radToDeg(radians) {
return radians * 180 / Math.PI;
}
function edgePoint(x1, y1, x2, y2, maxX, maxY) {
let pointCoords,
xDiff = x2 - x1,
yDiff = y2 - y1,
xIntercept = y => (y - y1) * xDiff / yDiff + x1,
yIntercept = x => (x - x1) * yDiff / xDiff + y1;
if (xDiff > 0 && yDiff > 0) {
let x = xIntercept(maxY);
pointCoords = x <= maxX ? [x, maxY] : [maxX, yIntercept(maxX)];
} else if (xDiff > 0 && yDiff < 0) {
let y = yIntercept(maxX);
pointCoords = y >= 0 ? [maxX, y] : [xIntercept(0), 0];
} else if (xDiff < 0 && yDiff < 0) {
let x = xIntercept(0);
pointCoords = x >= 0 ? [x, 0] : [0, yIntercept(0)];
} else {
let y = yIntercept(0);
pointCoords = y <= maxY ? [0, y] : [xIntercept(maxY), maxY];
}
return pointCoords;
}
let getPointCoords = (x, y) => {
let point = document.querySelector(`[data-x="${x}"][data-y="${y}"]`);
return [point.x.baseVal.value, point.y.baseVal.value]
};
let svgns = "http://www.w3.org/2000/svg",
svg = document.querySelector('svg'),
rect = document.querySelector('rect#map');
const COLUMN_COUNT = 33,
ROW_COUNT = 25,
HORZ_POINT_DISTANCE = 1.005,
VERT_POINT_DISTANCE = Math.sqrt(3) * HORZ_POINT_DISTANCE / 2,
ALTERNATING_OFFSET = HORZ_POINT_DISTANCE / 2,
[X_OFFSET, Y_OFFSET] = [0.25, 0.45],
[COLUMNS, ROWS] = [COLUMN_COUNT, ROW_COUNT].map(n => [...Array(n).keys()]),
POINTS = ROWS.map(y => COLUMNS.map(x => [x, y]));
const FIRING_ARC_SIZE = {
'small': Math.atan(HORZ_POINT_DISTANCE / (6 * VERT_POINT_DISTANCE)),
'medium': Math.atan((HORZ_POINT_DISTANCE / 2) / VERT_POINT_DISTANCE),
'large': Math.atan((21 * HORZ_POINT_DISTANCE) / (6 * VERT_POINT_DISTANCE))
}
POINTS.forEach((row, index) => row.forEach(([x, y]) => {
var cx = x * HORZ_POINT_DISTANCE + X_OFFSET + (isEven(index) ? ALTERNATING_OFFSET : 0),
cy = y * HORZ_POINT_DISTANCE * VERT_POINT_DISTANCE + Y_OFFSET,
point = document.createElementNS(svgns, 'use');
point.setAttributeNS(null, 'href', `#point`);
point.setAttributeNS(null, 'x', `${cx}in`);
point.setAttributeNS(null, 'y', `${cy}in`);
point.dataset.x = x;
point.dataset.y = y;
point.addEventListener('click', e => {
let selectedSoldier = document.querySelector('.soldier-record.selected');
if (selectedSoldier) {
let counter = document.createElementNS(svgns, 'circle');
let text = document.createElementNS(svgns, 'text');
counter.setAttributeNS(null, 'cx', `${cx}in`);
counter.setAttributeNS(null, 'cy', `${cy}in`);
counter.setAttributeNS(null, 'r', '0.25in');
counter.dataset.troopNumber = selectedSoldier.dataset.troopNumber;
counter.dataset.troopAllegiance = selectedSoldier.dataset.troopAllegiance;
counter.classList.add('counter');
text.setAttributeNS(null, 'text-anchor', 'middle');
text.setAttributeNS(null, 'x', `${cx}in`);
text.setAttributeNS(null, 'y', `${cy + 0.25}in`);
text.dataset.troopNumber = selectedSoldier.dataset.troopNumber;
text.dataset.troopAllegiance = selectedSoldier.dataset.troopAllegiance;
text.textContent = `${selectedSoldier.dataset.troopNumber}`;
text.classList.add('counter');
document.querySelectorAll(
`.counter[data-troop-number="${selectedSoldier.dataset.troopNumber}"][data-troop-allegiance="${selectedSoldier.dataset.troopAllegiance}"]`
).forEach(el => el.remove());
svg.appendChild(counter);
svg.appendChild(text);
}
});
svg.appendChild(point);
}));
rect.addEventListener('mousemove', e => {
var rect = e.target.getBoundingClientRect();
var pointerX = e.clientX - rect.left;
var pointerY = e.clientY - rect.top;
let [maxXpx, maxYpx] = [e.target.width, e.target.height].map(v => v.baseVal.value);
// console.log('x', `${toFixed(x / rect.width * maxX)}"`, 'y', `${toFixed(y / rect.height * maxY)}"`);
let p = document.querySelector('polygon.firing-arc.active');
// TODO: handle exactly horizontal and vertical lines
if (p) {
let {x: x1px, y: y1px} = p.points[1];
let [x2px, y2px] = [
pointerX / rect.width * maxXpx,
pointerY / rect.height * maxYpx
];
let xDiff = x2px - x1px;
let yDiff = -(y2px - y1px);
let angle = Math.abs(Math.atan(yDiff / xDiff));
if (xDiff < 0 && yDiff > 0) {
angle = Math.PI - angle;
} else if (xDiff < 0 && yDiff < 0) {
angle = Math.PI + angle;
} else if (xDiff > 0 && yDiff < 0) {
angle = 2 * Math.PI - angle;
}
console.log('angle:', `${toFixed(radToDeg(angle))}\u00B0`, `${angle}rad`);
let arcAngle = FIRING_ARC_SIZE[p.dataset.size];
let distance = Math.sqrt((x2px - x1px)**2 + (y2px - y1px)**2);
let yDelta = distance * Math.cos(angle) * Math.tan(arcAngle);
let xDelta = distance * Math.sin(angle) * Math.tan(arcAngle);
let [newY1, newX1] = [y2px + yDelta, x2px + xDelta];
let [newY2, newX2] = [y2px - yDelta, x2px - xDelta];
[newX1, newY1] = edgePoint(x1px, y1px, newX1, newY1, maxXpx, maxYpx);
[newX2, newY2] = edgePoint(x1px, y1px, newX2, newY2, maxXpx, maxYpx);
let oppositeEdgeConditions = [
newX1 == 0 && newX2 == maxXpx,
newX2 == 0 && newX1 == maxXpx,
newY1 == 0 && newY2 == maxYpx,
newY2 == 0 && newY1 == maxYpx
]
let orthogonalEdgeConditions = [
(newX1 == 0 || newX1 == maxXpx) && (newY2 == 0 || newY2 == maxYpx),
(newX2 == 0 || newX2 == maxXpx) && (newY1 == 0 || newY1 == maxYpx),
]
let points;
xDiff = x2px - x1px;
yDiff = y2px - y1px;
if (oppositeEdgeConditions.some(e => e)) {
let cornerPoints;
if (xDiff > 0 && yDiff > 0) {
if ((newY1 == 0 && newY2 == maxYpx) || (newY1 == maxYpx && newY2 == 0)) {
cornerPoints = [[maxXpx, 0], [maxXpx, maxYpx]];
} else {
cornerPoints = [[maxXpx, maxYpx], [0, maxYpx]];
}
points = `${newX1},${newY1} ${x1px},${y1px} ${newX2},${newY2} ${cornerPoints[0]} ${cornerPoints[1]}`;
} else if (xDiff > 0 && yDiff < 0) {
if ((newY1 == 0 && newY2 == maxYpx) || (newY1 == maxYpx && newY2 == 0)) {
cornerPoints = [[maxXpx, 0], [maxXpx, maxYpx]];
} else {
cornerPoints = [[0, 0], [maxXpx, 0]];
}
points = `${newX1},${newY1} ${x1px},${y1px} ${newX2},${newY2} ${cornerPoints[0]} ${cornerPoints[1]}`;
} else if (xDiff < 0 && yDiff > 0) {
if ((newY1 == 0 && newY2 == maxYpx) || (newY1 == maxYpx && newY2 == 0)) {
cornerPoints = [[0, maxYpx], [0, 0]];
} else {
cornerPoints = [[maxXpx, maxYpx], [0, maxYpx]];
}
points = `${newX1},${newY1} ${x1px},${y1px} ${newX2},${newY2} ${cornerPoints[0]} ${cornerPoints[1]}`;
} else {
if ((newY1 == 0 && newY2 == maxYpx) || (newY1 == maxYpx && newY2 == 0)) {
cornerPoints = [[0, maxYpx], [0, 0]];
} else {
cornerPoints = [[0, 0], [maxXpx, 0]];
}
points = `${newX1},${newY1} ${x1px},${y1px} ${newX2},${newY2} ${cornerPoints[0]} ${cornerPoints[1]}`;
}
} else if (orthogonalEdgeConditions.some(e => e)) {
let cornerPoint;
if (newX1 == 0 || newX1 == maxXpx) {
cornerPoint = [newX1, newY2];
} else {
cornerPoint = [newX2, newY1];
}
points = `${newX1},${newY1} ${x1px},${y1px} ${newX2},${newY2} ${cornerPoint}`;
} else {
points = `${newX1},${newY1} ${x1px},${y1px} ${newX2},${newY2}`;
}
p.setAttributeNS(null, 'points', points);
}
});
document.querySelectorAll('.soldier-record').forEach(el =>
el.addEventListener('click', e => {
if (e.target.classList.contains('selected')) {
e.target.classList.remove('selected');
} else {
document.querySelectorAll('.soldier-record.selected').forEach(el =>
el.classList.remove('selected')
);
e.target.classList.add('selected');
}
})
);
document.querySelectorAll('.set-firing-arc').forEach(el => el.addEventListener('click', e => {
let selectedSoldier = document.querySelector('.soldier-record.selected');
if (selectedSoldier) {
let {troopNumber, troopAllegiance} = selectedSoldier.dataset;
let existingArcs = document.querySelectorAll(
`.firing-arc[data-troop-number="${troopNumber}"][data-troop-allegiance="${troopAllegiance}"]`
);
if (existingArcs.length > 0) {
existingArcs.forEach(el => el.remove());
}
let counter = document.querySelector(
`circle.counter[data-troop-number="${troopNumber}"][data-troop-allegiance="${troopAllegiance}"]`
);
if (counter) {
let arcLayer = document.getElementById('firing-arcs');
let placeFiringArcListener = e => {
document.querySelectorAll('.firing-arc.active').forEach(el => el.classList.remove('active'));
document.querySelector('circle#point').style.display = '';
rect.removeEventListener('click', placeFiringArcListener);
};
rect.addEventListener('click', placeFiringArcListener);
let pivotPoint = [counter.cx.baseVal.value, counter.cy.baseVal.value];
let firingArc = document.createElementNS(svgns, 'polygon');
firingArc.classList.add('firing-arc', 'active');
firingArc.dataset.troopNumber = troopNumber;
firingArc.dataset.troopAllegiance = troopAllegiance;
firingArc.dataset.size = e.target.dataset.size;
firingArc.setAttributeNS(null, 'points', `${pivotPoint} ${pivotPoint} ${pivotPoint}`);
arcLayer.prepend(firingArc);
document.querySelector('circle#point').style.display = 'none';
}
}
}));