250 lines
8.5 KiB
JavaScript
250 lines
8.5 KiB
JavaScript
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-troop-number="${activeFiringArc.dataset.troopNumber}"][data-troop-allegiance="${activeFiringArc.dataset.troopAllegiance}"]`),
|
|
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 {
|
|
constructor(svg) {
|
|
this.svg = svg;
|
|
}
|
|
|
|
set(size, troopAllegiance, troopNumber, { x, y }) {
|
|
const svgns = "http://www.w3.org/2000/svg";
|
|
|
|
let existingArcs = this.svg.querySelectorAll(
|
|
`#firing-arcs [data-troop-number="${troopNumber}"][data-troop-allegiance="${troopAllegiance}"]`
|
|
);
|
|
|
|
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.troopNumber = troopNumber;
|
|
firingArc.dataset.troopAllegiance = troopAllegiance;
|
|
firingArc.dataset.size = size;
|
|
firingArc.setAttributeNS(null, 'points', `${pivotPoint} ${pivotPoint} ${pivotPoint}`);
|
|
|
|
firingArcOutline.dataset.troopNumber = troopNumber;
|
|
firingArcOutline.dataset.troopAllegiance = troopAllegiance;
|
|
firingArcOutline.setAttributeNS(null, 'points', `${pivotPoint} ${pivotPoint} ${pivotPoint}`);
|
|
|
|
let clipShape = document.createElementNS(svgns, 'circle');
|
|
clipShape.setAttributeNS(null, 'cx', tPt.x);
|
|
clipShape.setAttributeNS(null, 'cy', tPt.y);
|
|
clipShape.setAttributeNS(null, 'r', 100);
|
|
|
|
let clipPath = document.createElementNS(svgns, 'clipPath');
|
|
clipPath.setAttributeNS(null, 'id', `clip-path-${troopAllegiance}-${troopNumber}`);
|
|
clipPath.dataset.troopNumber = troopNumber;
|
|
clipPath.dataset.troopAllegiance = troopAllegiance;
|
|
clipPath.appendChild(clipShape);
|
|
|
|
arcContainer.appendChild(clipPath);
|
|
arcLayer.appendChild(firingArc);
|
|
outlineLayer.appendChild(firingArcOutline);
|
|
|
|
let firingArcPlacementListener = e => {
|
|
this.svg.querySelectorAll('.firing-arc.active').forEach(el => el.classList.remove('active'));
|
|
grid.removeAttribute('style');
|
|
this.svg.removeEventListener('mousemove', position);
|
|
firingArc.removeEventListener('click', firingArcPlacementListener);
|
|
firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
|
|
};
|
|
|
|
let cancelFiringArcPlacement = e => {
|
|
e.preventDefault();
|
|
|
|
firingArc.removeEventListener('click', firingArcPlacementListener);
|
|
firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
|
|
|
|
let existingArcs = this.svg.querySelectorAll(
|
|
`#firing-arcs [data-troop-number="${troopNumber}"][data-troop-allegiance="${troopAllegiance}"]`
|
|
);
|
|
|
|
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);
|
|
}
|
|
}
|