const HORZ_POINT_DISTANCE = 1.005,
VERT_POINT_DISTANCE = Math.sqrt(3) * HORZ_POINT_DISTANCE / 2,
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))
};
function calculateAngle(xDiff, yDiff) {
yDiff = -yDiff;
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;
}
return angle;
}
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;
}
function position(e) {
let activeFiringArc = this.querySelector('polygon.firing-arc.active');
// TODO: handle exactly horizontal and vertical lines
if (activeFiringArc) {
let activeFiringArcOutline = this.querySelector(`#lines polygon[data-number="${activeFiringArc.dataset.number}"][data-allegiance="${activeFiringArc.dataset.allegiance}"]`),
board = this.querySelector('#image-maps'),
{ width, height } = board.getBBox(),
pt = new DOMPoint(e.clientX, e.clientY),
{ x: pointerX, y: pointerY } = pt.matrixTransform(board.getScreenCTM().inverse()),
[maxXpx, maxYpx] = [width, height],
{ x: x1px, y: y1px } = activeFiringArc.points[0];
let [x2px, y2px] = [
pointerX / width * maxXpx,
pointerY / height * maxYpx
];
let xDiff = x2px - x1px;
let yDiff = y2px - y1px;
let angle = calculateAngle(xDiff, yDiff);
let arcAngle = FIRING_ARC_SIZE[activeFiringArc.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;
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]];
}
} 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]];
}
} 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]];
}
} else {
if ((newY1 == 0 && newY2 == maxYpx) || (newY1 == maxYpx && newY2 == 0)) {
cornerPoints = [[0, maxYpx], [0, 0]];
} else {
cornerPoints = [[0, 0], [maxXpx, 0]];
}
}
points = `${x1px},${y1px} ${newX1},${newY1} ${cornerPoints[1]} ${cornerPoints[0]} ${newX2},${newY2}`;
} else if (orthogonalEdgeConditions.some(e => e)) {
let cornerPoints = [];
let cp1, cp2;
if (newX1 == 0 || newX1 == maxXpx) {
cp1 = [newX1, yDiff > 0 ? maxYpx : 0];
} else {
cp1 = [xDiff > 0 ? maxXpx : 0, newY1];
}
if (newX2 == 0 || newX2 == maxXpx) {
cp2 = [newX2, yDiff > 0 ? maxYpx : 0];
} else {
cp2 = [xDiff > 0 ? maxXpx : 0, newY2];
}
if (cp1[0] == cp2[0] && cp1[1] == cp2[1]) {
cornerPoints.push(cp1);
} else {
cornerPoints.push(cp1);
cornerPoints.push([xDiff > 0 ? maxXpx : 0, yDiff > 0 ? maxYpx : 0])
cornerPoints.push(cp2);
}
points = `${x1px},${y1px} ${newX1},${newY1} ${cornerPoints.join(' ')} ${newX2},${newY2}`;
} else {
points = `${x1px},${y1px} ${newX1},${newY1} ${newX2},${newY2}`;
}
activeFiringArcOutline.setAttributeNS(null, 'points', points);
activeFiringArc.setAttributeNS(null, 'points', points);
}
}
export default class FiringArc {
#firingArcVisibility = {
davion: false,
liao: false
};
constructor(svg) {
this.svg = svg;
}
set(size, { dataset: { allegiance, number }}, { x, y }) {
const svgns = "http://www.w3.org/2000/svg";
let existingArcs = this.svg.querySelectorAll(
`#firing-arcs [data-number="${number}"][data-allegiance="${allegiance}"]`
);
existingArcs.forEach(el => el.remove());
let arcLayer = this.svg.querySelector('#shapes');
let outlineLayer = this.svg.querySelector('#lines');
let arcContainer = this.svg.querySelector('#firing-arcs');
let grid = this.svg.querySelector('.board');
const transform = getComputedStyle(grid).transform.match(/-?\d+\.?\d*/g);
const pt = new DOMPoint(x, y);
const mtx = new DOMMatrix(transform);
let tPt = pt.matrixTransform(mtx);
let pivotPoint = [tPt.x, tPt.y];
let firingArc = document.createElementNS(svgns, 'polygon');
let firingArcOutline = document.createElementNS(svgns, 'polygon');
firingArc.classList.add('firing-arc', 'active');
firingArc.dataset.number = number;
firingArc.dataset.allegiance = allegiance;
firingArc.dataset.size = size;
firingArc.setAttributeNS(null, 'points', `${pivotPoint} ${pivotPoint} ${pivotPoint}`);
firingArcOutline.dataset.number = number;
firingArcOutline.dataset.allegiance = allegiance;
firingArcOutline.setAttributeNS(null, 'points', `${pivotPoint} ${pivotPoint} ${pivotPoint}`);
let clipShape = document.createElementNS(svgns, 'circle');
clipShape.setAttributeNS(null, 'cx', tPt.x);
clipShape.setAttributeNS(null, 'cy', tPt.y);
clipShape.setAttributeNS(null, 'r', 100);
let clipPath = document.createElementNS(svgns, 'clipPath');
clipPath.setAttributeNS(null, 'id', `clip-path-${allegiance}-${number}`);
clipPath.dataset.number = number;
clipPath.dataset.allegiance = allegiance;
clipPath.appendChild(clipShape);
arcContainer.appendChild(clipPath);
arcLayer.appendChild(firingArc);
outlineLayer.appendChild(firingArcOutline);
let firingArcPlacementListener = e => {
this.svg.querySelectorAll('.firing-arc.active').forEach(el => el.classList.remove('active'));
grid.removeAttribute('style');
this.svg.removeEventListener('mousemove', position);
firingArc.removeEventListener('click', firingArcPlacementListener);
firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
};
let cancelFiringArcPlacement = e => {
e.preventDefault();
firingArc.removeEventListener('click', firingArcPlacementListener);
firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
let existingArcs = this.svg.querySelectorAll(
`#firing-arcs [data-number="${number}"][data-allegiance="${allegiance}"]`
);
existingArcs.forEach(el => el.remove());
grid.removeAttribute('style');
this.svg.removeEventListener('mousemove', position);
};
grid.style.pointerEvents = 'none';
this.svg.addEventListener('mousemove', position);
firingArc.addEventListener('click', firingArcPlacementListener);
firingArc.addEventListener('contextmenu', cancelFiringArcPlacement);
}
clear(allegiance) {
const selector = `#firing-arcs [data-allegiance="${allegiance}"]`;
this.svg.querySelectorAll(selector).forEach(el => el.remove());
}
get({ dataset: { allegiance, number }}) {
return this.svg.querySelectorAll(`#firing-arcs polygon[data-number="${number}"][data-allegiance="${allegiance}"]`);
}
getUnclipped() {
return this.svg.querySelectorAll('#firing-arcs polygon:not([clip-path])');
}
toggleVisibility(allegiance) {
const vis = this.#firingArcVisibility[allegiance],
clipPaths = this.svg.querySelectorAll(`clipPath[data-allegiance="${allegiance}"]`);
clipPaths.forEach(cp => cp.style.display = !vis ? 'none' : '');
this.#firingArcVisibility[allegiance] = !vis;
}
toggleCounterVisibility({ dataset: { number, allegiance }}, vis) {
const cp = this.svg.querySelector(`#clip-path-${allegiance}-${number}`),
display = vis ? 'none' : '';
if (cp) {
cp.style.display = this.#firingArcVisibility[allegiance] ? 'none' : display;
}
}
clipAll() {
let unclipped = this.getUnclipped();
unclipped.forEach(el => {
const { number, allegiance } = el.dataset,
clipPathId = `clip-path-${allegiance}-${number}`,
isVisible = this.#firingArcVisibility[allegiance];
if (isVisible) {
this.svg.querySelector(`#${clipPathId}`).style.display = 'none';
}
el.setAttributeNS(null, 'clip-path', `url(#${clipPathId})`);
});
}
}