323 lines
11 KiB
JavaScript
323 lines
11 KiB
JavaScript
// 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 svgns = "http://www.w3.org/2000/svg",
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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 = 100;
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let svg;
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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 edgePoint(x1, y1, x2, y2, maxX, maxY, minX = 0, minY = 0) {
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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 pointCoords;
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}
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let cornerPoints;
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function position(e) {
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// TODO: handle exactly horizontal and vertical lines?
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let arcLayer = this.querySelector('#shapes');
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const activeFiringArc = arcLayer.querySelector('polygon.firing-arc.active');
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if (!activeFiringArc) {
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return;
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}
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let outlineLayer = this.querySelector('#lines');
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const { dataset: { allegiance, number }} = activeFiringArc,
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outlineSelector = `polyline[data-number="${number}"][data-allegiance="${allegiance}"]`,
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activeFiringArcOutline = outlineLayer.querySelector(outlineSelector);
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let grid = this.querySelector('.grid');
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let aim = outlineLayer.querySelector('line');
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let pt = new DOMPoint(e.clientX, e.clientY);
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let { x, y } = pt.matrixTransform(grid.getScreenCTM().inverse());
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let pivotPt = [x1, y1] = [aim.getAttribute('x1'), aim.getAttribute('y1')].map(n => parseFloat(n));
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let [maxX, maxY, minX, minY] = [
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grid.getBBox().x + grid.getBBox().width,
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grid.getBBox().y + grid.getBBox().height,
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grid.getBBox().x,
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grid.getBBox().y
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].map(n => parseFloat(n));
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let edgePointArgs = [aim.getAttribute('x1'), aim.getAttribute('y1'), x, y, maxX, maxY, minX, minY].map(n => parseFloat(n))
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let aimPt = [x2, y2] = edgePoint(...edgePointArgs);
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aim.setAttributeNS(null, 'x2', x2);
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aim.setAttributeNS(null, 'y2', y2);
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let angle = calculateAngle(x2 - x1, y2 - y1);
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let arcAngle = arcSize[activeFiringArc.dataset.size];
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let distance = Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
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let yDelta = distance * Math.cos(angle) * Math.tan(arcAngle);
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let xDelta = distance * Math.sin(angle) * Math.tan(arcAngle);
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let [newY1, newX1] = [y2 - yDelta, x2 - xDelta];
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let [newY2, newX2] = [y2 + yDelta, x2 + xDelta];
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let arcPt1 = [newX1, newY1] = edgePoint(x1, y1, newX1, newY1, maxX, maxY, minX, minY);
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let arcPt2 = [newX2, newY2] = edgePoint(x1, y1, newX2, newY2, maxX, maxY, minX, minY);
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activeFiringArcOutline.setAttributeNS(null, 'points', `${newX1},${newY1} ${x1},${y1} ${newX2},${newY2}`);
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function touchSameEdge([x1, y1], [x2, y2]) {
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return x1 === x2 || y1 === y2;
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}
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function touchOrthogonalEdges([x1, y1], [x2, y2]) {
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let xLimit = [minX, maxX], yLimit = [minY, maxY];
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return (xLimit.includes(x1) && yLimit.includes(y2)) || (yLimit.includes(y1) && xLimit.includes(x2));
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}
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function shareValue([x1, y1], [x2, y2]) {
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return x1 === x2 || y1 === y2;
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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 findSharedValue(pt, ...pts) {
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const sharedValPt = pts.find(([ptX, ptY]) => pt.includes(ptX) || pt.includes(ptY));
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if (!sharedValPt) {
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return;
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}
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const limits = [[minX, maxX], [minY, maxY]],
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nonSharedValIndex = pt[0] === sharedValPt[0] ? 1 : 0;
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let cornerVal;
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if (pt[nonSharedValIndex] < sharedValPt[nonSharedValIndex]) {
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cornerVal = Math.min(...limits[nonSharedValIndex])
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} else {
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cornerVal = Math.max(...limits[nonSharedValIndex]);
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}
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return cornerPoints.filter(cp => cp[nonSharedValIndex] === cornerVal);
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}
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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 = [arcPt2, pivotPt, arcPt1];
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} else if (touchOrthogonalEdges(arcPt1, arcPt2)) {
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if (touchSameEdge(aimPt, arcPt1) || touchSameEdge(aimPt, arcPt2)) {
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// 1-corner case
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let cp = cornerPoints.find(cp => shareValue(cp, arcPt1) && shareValue(cp, arcPt2));
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points = [arcPt2, pivotPt, arcPt1, cp];
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} else {
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// 3-corner case
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points = cornerPoints.filter(cp => !shareValue(cp, arcPt1) || !shareValue(cp, arcPt2));
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let index = points.findIndex(cp => shareValue(cp, arcPt2));
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points.splice(index + 1, 0, arcPt2, pivotPt, arcPt1);
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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 = findSharedValue(aimPt, arcPt1, arcPt2);
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let index = points.findIndex(cp => shareValue(cp, arcPt2));
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points.splice(index + 1, 0, arcPt2, pivotPt, arcPt1);
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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 = cornerPoints.filter(cp => shareValue(cp, aimPt) || shareValue(cp, aimPt));
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let index = points.findIndex(cp => shareValue(cp, arcPt2));
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points.splice(index + 1, 0, arcPt2, pivotPt, arcPt1);
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}
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}
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activeFiringArc.setAttributeNS(null, 'points', points.join(' '));
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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() {
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return svg.querySelectorAll('#firing-arcs polygon:not([clip-path])');
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};
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export default function (el) {
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svg = el;
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this.set = function (size, counter, { x, y }) {
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this.get(counter).forEach(fa => fa.remove());
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let arcLayer = svg.querySelector('#shapes');
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let outlineLayer = svg.querySelector('#lines');
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let arcContainer = svg.querySelector('#firing-arcs');
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let grid = svg.querySelector('.grid');
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let aim = document.createElementNS(svgns, 'line');
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aim.setAttributeNS(null, 'x1', x);
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aim.setAttributeNS(null, 'y1', y);
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aim.setAttributeNS(null, 'x2', x);
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aim.setAttributeNS(null, 'y2', y);
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outlineLayer.appendChild(aim);
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cornerPoints = (function () {
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let { x, y, width, height } = grid.getBBox();
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return [[x, y], [x + width, y], [x + width, y + height], [x, y + height]];
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})();
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let firingArc = document.createElementNS(svgns, 'polygon');
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let firingArcOutline = document.createElementNS(svgns, 'polyline');
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setDataAttrs(counter, firingArc);
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firingArc.dataset.size = size;
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firingArc.classList.add('firing-arc', 'active');
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firingArc.setAttributeNS(null, 'points', `${x},${y} ${x},${y} ${x},${y}`);
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setDataAttrs(counter, firingArcOutline);
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firingArcOutline.setAttributeNS(null, 'points', `${x},${y} ${x},${y} ${x},${y}`);
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let clipShape = document.createElementNS(svgns, 'circle');
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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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let clipPath = document.createElementNS(svgns, 'clipPath');
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setDataAttrs(counter, clipPath);
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clipPath.setAttributeNS(null, 'id', getClipPathId(counter));
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clipPath.appendChild(clipShape);
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arcContainer.appendChild(clipPath);
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arcLayer.appendChild(firingArc);
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outlineLayer.appendChild(firingArcOutline);
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let firingArcPlacementListener = e => {
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svg.querySelectorAll('.firing-arc.active').forEach(el => el.classList.remove('active'));
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grid.removeAttribute('style');
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svg.removeEventListener('mousemove', position);
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firingArc.removeEventListener('click', firingArcPlacementListener);
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firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
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};
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let cancelFiringArcPlacement = e => {
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e.preventDefault();
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firingArc.removeEventListener('click', firingArcPlacementListener);
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firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
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this.get(counter).forEach(fa => fa.remove());
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grid.removeAttribute('style');
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svg.removeEventListener('mousemove', position);
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};
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grid.style.pointerEvents = 'none';
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svg.addEventListener('mousemove', position);
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firingArc.addEventListener('click', firingArcPlacementListener);
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firingArc.addEventListener('contextmenu', cancelFiringArcPlacement);
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};
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this.clear = function (allegiance) {
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const selector = `#firing-arcs [data-allegiance="${allegiance}"]`;
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svg.querySelectorAll(selector).forEach(el => el.remove());
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};
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this.get = function ({ dataset: { allegiance, number }}) {
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return svg.querySelectorAll(`#firing-arcs [data-number="${number}"][data-allegiance="${allegiance}"], #firing-arcs line`);
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};
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this.toggleVisibility = function (allegiance) {
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const vis = firingArcVisibility[allegiance],
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clipPaths = svg.querySelectorAll(`clipPath[data-allegiance="${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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this.toggleCounterVisibility = function ({ 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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this.clipAll = function () {
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console.log('clipall')
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let unclipped = getUnclipped();
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unclipped.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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}
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