3 files changed, 76 insertions, 64 deletions
diff --git a/public/map.css b/public/map.css
index d960ba8..972870d 100644
--- a/public/map.css
+++ b/public/map.css
@@ -147,6 +147,7 @@ polygon.firing-arc[data-allegiance="liao"] {
 #lines polyline, #lines line {
   fill: none;
   stroke: black;
+  stroke-width: 0.5;
 }
 
 #lines line {
diff --git a/public/map.svg b/public/map.svg
index 6cee83a..d927ae4 100644
--- a/public/map.svg
+++ b/public/map.svg
@@ -46,8 +46,6 @@
   </g>
 
   <g class="board">
-    <g id="test-arcs">
-    </g>
     <g id="firing-arcs">
       <g id="shapes"/>
       <g id="lines"/>
diff --git a/src/modules/game/firingArc.js b/src/modules/game/firingArc.js
index e37d2a8..cbde0d4 100644
--- a/src/modules/game/firingArc.js
+++ b/src/modules/game/firingArc.js
@@ -19,7 +19,7 @@ const svgns = "http://www.w3.org/2000/svg",
     liao: false
   },
 
-  clippedFiringArcRadius = 100;
+  clippedFiringArcRadius = 25;
 
 let svg;
 
@@ -38,7 +38,7 @@ function calculateAngle(xDiff, yDiff) {
   return angle;
 }
 
-function edgePoint([x1, y1], [x2, y2], { minX = 0, minY = 0, maxX, maxY } = {}) {
+function edgePoint({ x: x1, y: y1 }, { x: x2, y: y2 }, { x: [minX, maxX], y: [minY, maxY] }) {
   const xDiff = x2 - x1,
     yDiff = y2 - y1,
     xIntercept = y => (y - y1) * xDiff / yDiff + x1,
@@ -64,50 +64,69 @@ function edgePoint([x1, y1], [x2, y2], { minX = 0, minY = 0, maxX, maxY } = {})
     pointCoords = y <= maxY ? [minX, y] : [xIntercept(maxY), maxY];
   }
 
-  return pointCoords;
+  return new Point(...pointCoords);
 }
 
-function position(activeFiringArc, activeFiringArcOutline, aim, grid, e) {
+class Point {
+  constructor(x = 0, y = 0) {
+    this.x = +x;
+    this.y = +y;
+  }
+
+  toString() {
+    return `${this.x},${this.y}`;
+  }
+}
+
+function position(e, firingArc, firingArcOutline, aimLine, grid) {
   // TODO: handle exactly horizontal and vertical lines?
 
-  let pt = new DOMPoint(e.clientX, e.clientY);
-  let { x: pointerX, y: pointerY } = pt.matrixTransform(grid.getScreenCTM().inverse());
+  let pointer = new DOMPoint(e.clientX, e.clientY);
+  let pointerPt = pointer.matrixTransform(grid.getScreenCTM().inverse());
+
+  let pivotPt = new Point(aimLine.getAttribute('x1'), aimLine.getAttribute('y1'));
 
-  let pivotPt = [x1, y1] = [aim.getAttribute('x1'), aim.getAttribute('y1')].map(n => parseFloat(n));
   let { x, y, width, height } = grid.getBBox();
-  let [minX, minY, maxX, maxY] = [x, y, x + width, y + height];
-  let bounds = { minX, minY, maxX, maxY };
-  let cornerPoints = [[x, y], [x + width, y], [x + width, y + height], [x, y + height]];
 
-  let aimPt = [x2, y2] = edgePoint(pivotPt, [pointerX, pointerY], bounds);
+  const bounds = {
+    x: [x, x + width],
+    y: [y, y + height]
+  }
+
+  let cornerPoints = [
+    [x, y],
+    [x + width, y],
+    [x + width, y + height],
+    [x, y + height]
+  ].map(([x, y]) => new Point(x, y));
 
-  aim.setAttributeNS(null, 'x2', x2);
-  aim.setAttributeNS(null, 'y2', y2);
+  let aimPt = edgePoint(pivotPt, pointerPt, bounds);
+  aimLine.setAttributeNS(null, 'x2', aimPt.x);
+  aimLine.setAttributeNS(null, 'y2', aimPt.y);
 
-  let angle = calculateAngle(x2 - x1, y2 - y1);
-  let arcAngle = arcSize[activeFiringArc.dataset.size];
-  let distance = Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
+  let angle = calculateAngle(aimPt.x - pivotPt.x, aimPt.y - pivotPt.y);
+  let arcAngle = arcSize[firingArc.dataset.size];
+  let distance = Math.sqrt((aimPt.x - pivotPt.x) ** 2 + (aimPt.y - pivotPt.y) ** 2);
   let yDelta = distance * Math.cos(angle) * Math.tan(arcAngle);
   let xDelta = distance * Math.sin(angle) * Math.tan(arcAngle);
 
-  let [newY1, newX1] = [y2 - yDelta, x2 - xDelta];
-  let [newY2, newX2] = [y2 + yDelta, x2 + xDelta];
+  let arcPt1 = new Point(aimPt.x - xDelta, aimPt.y - yDelta);
+  let arcPt2 = new Point(aimPt.x + xDelta, aimPt.y + yDelta);
 
-  let arcPt1 = [newX1, newY1] = edgePoint(pivotPt, [newX1, newY1], bounds);
-  let arcPt2 = [newX2, newY2] = edgePoint(pivotPt, [newX2, newY2], bounds);
+  arcPt1 = edgePoint(pivotPt, arcPt1, bounds);
+  arcPt2 = edgePoint(pivotPt, arcPt2, bounds);
 
-  activeFiringArcOutline.setAttributeNS(null, 'points', `${newX1},${newY1} ${x1},${y1} ${newX2},${newY2}`);
+  firingArcOutline.setAttributeNS(null, 'points', `${arcPt1} ${pivotPt} ${arcPt2}`);
 
-  function touchSameEdge([x1, y1], [x2, y2]) {
+  function touchSameEdge({ x: x1, y: y1 }, { x: x2, y: y2 }) {
     return x1 === x2 || y1 === y2;
   }
 
-  function touchOrthogonalEdges([x1, y1], [x2, y2]) {
-    let xLimit = [minX, maxX], yLimit = [minY, maxY];
-    return (xLimit.includes(x1) && yLimit.includes(y2)) || (yLimit.includes(y1) && xLimit.includes(x2));
+  function touchOrthogonalEdges({ x: x1, y: y1 }, { x: x2, y: y2 }) {
+    return (bounds.x.includes(x1) && bounds.y.includes(y2)) || (bounds.y.includes(y1) && bounds.x.includes(x2));
   }
 
-  function shareValue([x1, y1], [x2, y2]) {
+  function shareValue({ x: x1, y: y1 }, { x: x2, y: y2 }) {
     return x1 === x2 || y1 === y2;
   }
 
@@ -115,25 +134,24 @@ function position(activeFiringArc, activeFiringArcOutline, aim, grid, e) {
   // if they share an x value, we will look for corner y value
   // if they share a y value, we will look for corner x value
   // is aim pt non-shared value greater or less than arcpt non-shared value?
-  function findSharedValue(pt, ...pts) {
-    const sharedValPt = pts.find(([ptX, ptY]) => pt.includes(ptX) || pt.includes(ptY));
+  function findWhichCorners(pt, ...pts) {
+    const ptVals = Object.values(pt),
+      sharedValPt = pts.find(({ x, y }) => ptVals.includes(x) || ptVals.includes(y));
 
     if (!sharedValPt) {
       return;
     }
 
-    const limits = [[minX, maxX], [minY, maxY]],
-      nonSharedValIndex = pt[0] === sharedValPt[0] ? 1 : 0;
-
+    const nonSharedValKey = pt.x === sharedValPt.x ? 'x' : 'y';
     let cornerVal;
 
-    if (pt[nonSharedValIndex] < sharedValPt[nonSharedValIndex]) {
-      cornerVal = Math.min(...limits[nonSharedValIndex])
+    if (pt[nonSharedValKey] < sharedValPt[nonSharedValKey]) {
+      cornerVal = Math.min(...bounds[nonSharedValKey]);
     } else {
-      cornerVal = Math.max(...limits[nonSharedValIndex]);
+      cornerVal = Math.max(...bounds[nonSharedValKey]);
     }
 
-    return cornerPoints.filter(cp => cp[nonSharedValIndex] === cornerVal);
+    return cornerPoints.filter(cp => cp[nonSharedValKey] === cornerVal);
   }
 
   let points;
@@ -155,7 +173,7 @@ function position(activeFiringArc, activeFiringArcOutline, aim, grid, e) {
   } else {
     if (touchSameEdge(aimPt, arcPt1) || touchSameEdge(aimPt, arcPt2)) {
       // 2-corner case, aim and an arc point touch the same edge
-      points = findSharedValue(aimPt, arcPt1, arcPt2);
+      points = findWhichCorners(aimPt, arcPt1, arcPt2);
       let index = points.findIndex(cp => shareValue(cp, arcPt2));
       points.splice(index + 1, 0, arcPt2, pivotPt, arcPt1);
     } else {
@@ -166,7 +184,7 @@ function position(activeFiringArc, activeFiringArcOutline, aim, grid, e) {
     }
   }
 
-  activeFiringArc.setAttributeNS(null, 'points', points.join(' '));
+  firingArc.setAttributeNS(null, 'points', points.join(' '));
 }
 
 function setDataAttrs({ dataset: { allegiance, number }}, el) {
@@ -179,7 +197,7 @@ function getClipPathId({ dataset: { allegiance, number }}) {
 }
 
 function getUnclipped() {
-  return svg.querySelectorAll('#firing-arcs polygon:not([clip-path])');
+  return svg.querySelectorAll('#firing-arcs :not([clip-path])');
 };
 
 export default function (el) {
@@ -192,25 +210,23 @@ export default function (el) {
     let outlineLayer = svg.querySelector('#lines');
     let arcContainer = svg.querySelector('#firing-arcs');
     let grid = svg.querySelector('.grid');
-    let points = `${x},${y} ${x},${y} ${x},${y}`;
 
-    let aim = document.createElementNS(svgns, 'line');
-    aim.setAttributeNS(null, 'x1', x);
-    aim.setAttributeNS(null, 'y1', y);
-    aim.setAttributeNS(null, 'x2', x);
-    aim.setAttributeNS(null, 'y2', y);
-    outlineLayer.appendChild(aim);
+    let aimLine = document.createElementNS(svgns, 'line');
+    aimLine.setAttributeNS(null, 'x1', x);
+    aimLine.setAttributeNS(null, 'y1', y);
+    aimLine.setAttributeNS(null, 'x2', x);
+    aimLine.setAttributeNS(null, 'y2', y);
+    outlineLayer.appendChild(aimLine);
 
     let firingArc = document.createElementNS(svgns, 'polygon');
-    let firingArcOutline = document.createElementNS(svgns, 'polyline');
-
     setDataAttrs(counter, firingArc);
+    firingArc.setAttributeNS(null, 'points', `${x},${y}`);
     firingArc.dataset.size = size;
     firingArc.classList.add('firing-arc', 'active');
-    firingArc.setAttributeNS(null, 'points', points);
 
+    let firingArcOutline = document.createElementNS(svgns, 'polyline');
     setDataAttrs(counter, firingArcOutline);
-    firingArcOutline.setAttributeNS(null, 'points', points);
+    firingArcOutline.setAttributeNS(null, 'points', `${x},${y}`);
 
     let clipShape = document.createElementNS(svgns, 'circle');
     clipShape.setAttributeNS(null, 'cx', x);
@@ -226,31 +242,29 @@ export default function (el) {
     arcLayer.appendChild(firingArc);
     outlineLayer.appendChild(firingArcOutline);
 
-    const positionListener = position.bind(svg, firingArc, firingArcOutline, aim, grid);
+    // const positionListener = position.bind(svg, firingArc, firingArcOutline, aim, grid);
+    function positionListener(e) {
+      position(e, firingArc, firingArcOutline, aimLine, grid);
+    }
 
-    let firingArcPlacementListener = e => {
-      svg.querySelectorAll('.firing-arc.active').forEach(el => el.classList.remove('active'));
+    let placementListener = e => {
       grid.removeAttribute('style');
+      aimLine.remove();
+      svg.querySelectorAll('.firing-arc.active').forEach(el => el.classList.remove('active'));
       svg.removeEventListener('mousemove', positionListener);
-      firingArc.removeEventListener('click', firingArcPlacementListener);
-      firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
     };
 
-    let cancelFiringArcPlacement = e => {
+    let cancelPlacementListener = e => {
       e.preventDefault();
 
-      firingArc.removeEventListener('click', firingArcPlacementListener);
-      firingArc.removeEventListener('contextmenu', cancelFiringArcPlacement);
-
       this.get(counter).forEach(fa => fa.remove());
-
       grid.removeAttribute('style');
       svg.removeEventListener('mousemove', positionListener);
     };
 
     grid.style.pointerEvents = 'none';
-    firingArc.addEventListener('click', firingArcPlacementListener);
-    firingArc.addEventListener('contextmenu', cancelFiringArcPlacement);
+    firingArc.addEventListener('click', placementListener, { once: true });
+    firingArc.addEventListener('contextmenu', cancelPlacementListener, { once: true });
     svg.addEventListener('mousemove', positionListener);
   };
 
@@ -281,7 +295,6 @@ export default function (el) {
   };
 
   this.clipAll = function () {
-    console.log('clipall')
     let unclipped = getUnclipped();
 
     unclipped.forEach(el => {