349 lines
11 KiB
JavaScript
349 lines
11 KiB
JavaScript
// source: https://www.redblobgames.com/grids/hexagons/
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// Horizontal distance between hex centers is sqrt(3) * size. The vertical
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// distance is 3 / 2 * size. When we calculate horzDist / vertDist, the size
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// cancels out, leaving us with a unitless ratio of sqrt(3) / (3 / 2), or
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// 2 * sqrt(3) / 3.
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const horzToVertDistRatio = 2 * Math.sqrt(3) / 3,
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arcSize = {
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'small': Math.atan(horzToVertDistRatio / 6),
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'medium': Math.atan(horzToVertDistRatio / 2),
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'large': Math.atan(7 * horzToVertDistRatio / 2)
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},
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firingArcVisibility = {
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davion: false,
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liao: false
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},
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clippedFiringArcRadius = 25;
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class Point {
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constructor(x = 0, y = 0) {
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this.x = +x;
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this.y = +y;
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}
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toString() {
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return `${this.x},${this.y}`;
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}
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}
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function calculateAngle(xDiff, yDiff) {
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yDiff = -yDiff;
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let angle = Math.abs(Math.atan(yDiff / xDiff));
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if (xDiff < 0 && yDiff > 0) {
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angle = Math.PI - angle;
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} else if (xDiff < 0 && yDiff < 0) {
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angle = Math.PI + angle;
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} else if (xDiff > 0 && yDiff < 0) {
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angle = 2 * Math.PI - angle;
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}
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return angle;
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}
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function calcEdgePt({ x: x1, y: y1 }, { x: x2, y: y2 }, { x: [minX, maxX], y: [minY, maxY] }) {
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const xDiff = x2 - x1,
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yDiff = y2 - y1,
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xIntercept = y => (y - y1) * xDiff / yDiff + x1,
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yIntercept = x => (x - x1) * yDiff / xDiff + y1;
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let pointCoords;
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if (xDiff > 0 && yDiff > 0) {
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let x = xIntercept(maxY);
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pointCoords = x <= maxX ? [x, maxY] : [maxX, yIntercept(maxX)];
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} else if (xDiff > 0 && yDiff < 0) {
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let y = yIntercept(maxX);
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pointCoords = y >= minY ? [maxX, y] : [xIntercept(minY), minY];
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} else if (xDiff < 0 && yDiff < 0) {
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let x = xIntercept(minY);
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pointCoords = x >= minX ? [x, minY] : [minX, yIntercept(minX)];
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} else {
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let y = yIntercept(minX);
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pointCoords = y <= maxY ? [minX, y] : [xIntercept(maxY), maxY];
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}
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return new Point(...pointCoords);
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}
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function touchSameEdge({ x: x1, y: y1 }, { x: x2, y: y2 }) {
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return x1 === x2 || y1 === y2;
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}
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function shareValue({ x: x1, y: y1 }, { x: x2, y: y2 }) {
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return x1 === x2 || y1 === y2;
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}
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function touchOrthogonalEdges({ x: x1, y: y1 }, { x: x2, y: y2 }, bounds) {
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return (bounds.x.includes(x1) && bounds.y.includes(y2)) || (bounds.y.includes(y1) && bounds.x.includes(x2));
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}
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function getCornerPts({ x: [xMin, xMax], y: [yMin, yMax] }) {
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const corners = [[xMin, yMin], [xMax, yMin], [xMax, yMax], [xMin, yMax]];
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return corners.map(([x, y]) => new Point(x, y));
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}
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function getBounds({ x, y, width, height }) {
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return {
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x: [x, x + width],
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y: [y, y + height]
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};
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}
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// which arcpt does aimpt share a value with?
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// if they share an x value, we will look for corner y value
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// if they share a y value, we will look for corner x value
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// is aim pt non-shared value greater or less than arcpt non-shared value?
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function findWhichTwoCorners(pt, bounds, ...pts) {
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const ptVals = Object.values(pt),
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sharedValPt = pts.find(({ x, y }) => ptVals.includes(x) || ptVals.includes(y));
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if (!sharedValPt) {
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return;
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}
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const nonSharedValKey = pt.x === sharedValPt.x ? 'y' : 'x';
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let cornerVal;
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if (pt[nonSharedValKey] < sharedValPt[nonSharedValKey]) {
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cornerVal = Math.min(...bounds[nonSharedValKey]);
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} else {
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cornerVal = Math.max(...bounds[nonSharedValKey]);
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}
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return getCornerPts(bounds).filter(cp => cp[nonSharedValKey] === cornerVal);
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}
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function selectCornerPoints(aimPt, arcPt1, arcPt2, bounds) {
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const cornerPts = getCornerPts(bounds);
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let points;
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if (touchSameEdge(arcPt1, arcPt2)) {
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// 0-corner case
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points = [];
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} else if (touchOrthogonalEdges(arcPt1, arcPt2, bounds)) {
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if (touchSameEdge(aimPt, arcPt1) || touchSameEdge(aimPt, arcPt2)) {
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// 1-corner case
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let cp = cornerPts.find(cp => shareValue(cp, arcPt1) && shareValue(cp, arcPt2));
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points = [cp];
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} else {
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// 3-corner case
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points = cornerPts.filter(cp => !shareValue(cp, arcPt1) || !shareValue(cp, arcPt2));
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}
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} else {
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if (touchSameEdge(aimPt, arcPt1) || touchSameEdge(aimPt, arcPt2)) {
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// 2-corner case, aim and an arc point touch the same edge
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points = findWhichTwoCorners(aimPt, bounds, arcPt1, arcPt2);
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} else {
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// 2-corner case, aim and both arc points all touch different edges
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points = cornerPts.filter(cp => shareValue(cp, aimPt) || shareValue(cp, aimPt));
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}
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}
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return points;
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}
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function orderPoints(arcPoints, cornerPts) {
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if (cornerPts.length === 0) {
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return arcPoints;
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}
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const index = cornerPts.findIndex(cp => shareValue(cp, arcPoints.at(0)));
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return cornerPts.slice(0, index + 1).concat(arcPoints).concat(cornerPts.slice(index + 1));
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}
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function calcArcLinePtDeltas(aimPt, pivotPt, size) {
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const angle = calculateAngle(aimPt.x - pivotPt.x, aimPt.y - pivotPt.y),
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arcAngle = arcSize[size],
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distance = Math.sqrt((aimPt.x - pivotPt.x) ** 2 + (aimPt.y - pivotPt.y) ** 2),
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yDelta = distance * Math.cos(angle) * Math.tan(arcAngle),
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xDelta = distance * Math.sin(angle) * Math.tan(arcAngle);
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return { xDelta, yDelta };
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}
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function calcPoints(e, aimLine, grid, size) {
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const pointer = new DOMPoint(e.clientX, e.clientY),
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pointerPt = pointer.matrixTransform(grid.getScreenCTM().inverse()),
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pivotPt = new Point(aimLine.getAttribute('x1'), aimLine.getAttribute('y1')),
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bounds = getBounds(grid.getBBox()),
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aimPt = calcEdgePt(pivotPt, pointerPt, bounds),
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{ xDelta, yDelta } = calcArcLinePtDeltas(aimPt, pivotPt, size),
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arcPt1 = calcEdgePt(pivotPt, new Point(aimPt.x - xDelta, aimPt.y - yDelta), bounds),
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arcPt2 = calcEdgePt(pivotPt, new Point(aimPt.x + xDelta, aimPt.y + yDelta), bounds),
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outlinePoints = [arcPt2, pivotPt, arcPt1],
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cornerPoints = selectCornerPoints(aimPt, arcPt1, arcPt2, bounds),
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arcPoints = orderPoints(outlinePoints, cornerPoints);
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return { aimPt, outlinePoints, arcPoints };
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}
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function setDataAttrs({ dataset: { allegiance, number }}, el) {
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el.dataset.allegiance = allegiance;
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el.dataset.number = number;
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}
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function getClipPathId({ dataset: { allegiance, number }}) {
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return `clip-path-${allegiance}-${number}`;
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}
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function getUnclipped(svg) {
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return svg.querySelectorAll('#firing-arcs #shapes polygon:not([clip-path]), #firing-arcs #lines polyline:not([clip-path])');
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};
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function createAimLine(x, y, container) {
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const aimLine = document.createElementNS(svgns, 'line');
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aimLine.setAttributeNS(null, 'x1', x);
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aimLine.setAttributeNS(null, 'y1', y);
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aimLine.setAttributeNS(null, 'x2', x);
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aimLine.setAttributeNS(null, 'y2', y);
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container.appendChild(aimLine);
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return aimLine;
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}
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function createClipPath(x, y, id, container) {
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const clipShape = document.createElementNS(svgns, 'circle'),
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clipPath = document.createElementNS(svgns, 'clipPath');
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clipShape.setAttributeNS(null, 'cx', x);
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clipShape.setAttributeNS(null, 'cy', y);
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clipShape.setAttributeNS(null, 'r', clippedFiringArcRadius);
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clipPath.setAttributeNS(null, 'id', id);
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clipPath.appendChild(clipShape);
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container.appendChild(clipPath);
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return clipPath;
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}
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function createFiringArc(x, y, size, container) {
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const firingArc = document.createElementNS(svgns, 'polygon');
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firingArc.setAttributeNS(null, 'points', `${x},${y}`);
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firingArc.dataset.size = size;
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firingArc.classList.add('firing-arc', 'active');
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container.appendChild(firingArc);
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return firingArc;
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}
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function createFiringArcOutline(x, y, container) {
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const firingArcOutline = document.createElementNS(svgns, 'polyline');
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firingArcOutline.setAttributeNS(null, 'points', `${x},${y}`);
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container.appendChild(firingArcOutline);
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return firingArcOutline;
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}
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function queryContainers(svg) {
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const grid = svg.querySelector('.grid'),
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arcContainer = svg.querySelector('#firing-arcs'),
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arcLayer = arcContainer.querySelector('#shapes'),
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outlineLayer = arcContainer.querySelector('#lines');
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return { grid, containers: { arcContainer, arcLayer, outlineLayer }};
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}
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function create(x, y, size, counter, { arcContainer, arcLayer, outlineLayer }) {
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const aimLine = createAimLine(x, y, outlineLayer),
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firingArc = createFiringArc(x, y, size, arcLayer),
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firingArcOutline = createFiringArcOutline(x, y, outlineLayer),
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clipPath = createClipPath(x, y, getClipPathId(counter), arcContainer);
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setDataAttrs(counter, firingArc);
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setDataAttrs(counter, firingArcOutline);
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setDataAttrs(counter, clipPath);
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return { aimLine, firingArc, firingArcOutline };
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}
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function set(svg, size, counter, { x, y }) {
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get(svg, counter).forEach(el => el.remove());
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const { grid, containers } = queryContainers(svg),
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{ aimLine, firingArc, firingArcOutline } = create(x, y, size, counter, containers);
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function positionListener(e) {
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const { aimPt, outlinePoints, arcPoints } = calcPoints(e, aimLine, grid, size);
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aimLine.setAttributeNS(null, 'x2', aimPt.x);
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aimLine.setAttributeNS(null, 'y2', aimPt.y);
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firingArcOutline.setAttributeNS(null, 'points', outlinePoints.join(' '));
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firingArc.setAttributeNS(null, 'points', arcPoints.join(' '));
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}
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function placementListener() {
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aimLine.remove();
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firingArc.classList.remove('active');
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grid.removeAttribute('style');
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svg.removeEventListener('mousemove', positionListener);
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}
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function cancelPlacementListener(e) {
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e.preventDefault();
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get(counter).forEach(el => el.remove());
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grid.removeAttribute('style');
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svg.removeEventListener('mousemove', positionListener);
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}
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grid.style.pointerEvents = 'none';
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firingArc.addEventListener('click', placementListener, { once: true });
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firingArc.addEventListener('contextmenu', cancelPlacementListener, { once: true });
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svg.addEventListener('mousemove', positionListener);
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}
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function clear(svg, allegiance) {
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const selector = `#firing-arcs [data-allegiance="${allegiance}"]`;
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svg.querySelectorAll(selector).forEach(el => el.remove());
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}
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function get(svg, { dataset: { allegiance, number }}) {
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return svg.querySelectorAll(`#firing-arcs [data-number="${number}"][data-allegiance="${allegiance}"], #firing-arcs line`);
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}
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function toggleVisibility(svg, allegiance) {
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const vis = firingArcVisibility[allegiance],
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clipPaths = svg.querySelectorAll(`clipPath[data-allegiance="${allegiance}"]`);
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clipPaths.forEach(cp => cp.style.display = !vis ? 'none' : '');
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firingArcVisibility[allegiance] = !vis;
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}
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function toggleCounterVisibility(svg, { dataset: { number, allegiance }}, vis) {
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const cp = svg.querySelector(`#clip-path-${allegiance}-${number}`),
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display = vis ? 'none' : '';
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if (cp) {
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cp.style.display = firingArcVisibility[allegiance] ? 'none' : display;
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}
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}
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function clipAll(svg) {
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getUnclipped(svg).forEach(el => {
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const { number, allegiance } = el.dataset,
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clipPathId = `clip-path-${allegiance}-${number}`,
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isVisible = firingArcVisibility[allegiance];
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if (isVisible) {
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svg.querySelector(`#${clipPathId}`).style.display = 'none';
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}
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el.setAttributeNS(null, 'clip-path', `url(#${clipPathId})`);
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});
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}
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export { set, clear, get, toggleVisibility, toggleCounterVisibility, clipAll };
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