1 files changed, 41 insertions, 14 deletions
diff --git a/src/modules/pan.js b/src/modules/pan.js
index 6f2cacf..4fcb416 100644
--- a/src/modules/pan.js
+++ b/src/modules/pan.js
@@ -2,6 +2,10 @@ import getComputedTransformMatrix from './utils.js';
 
 const minDistanceThreshold = 5;
 
+function mainButtonPressed(e) {
+  return e.button === 0;
+}
+
 function distanceBetween({ x: x1, y: y1 }, { x: x2, y: y2 }) {
   return Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
 }
@@ -20,15 +24,26 @@ function getTranslateMatrix(startPt, movePt) {
   return translateMatrix.translate(movePt.x - startPt.x, movePt.y - startPt.y);
 }
 
-export default function (svg, el, e) {
-  e.preventDefault();
+export function manualPan(gb, counter) {
+  const mtx = getComputedTransformMatrix(gb);
+  const inverseScreenCTM = gb.getScreenCTM().inverse();
 
-  const mtx = getComputedTransformMatrix(el),
-    inverseScreenCTM = el.getScreenCTM().inverse();
+  const counterRect = counter.getBoundingClientRect();
+  const mapRect = document.querySelector('object').getBoundingClientRect();
 
-  let startPt = new DOMPoint(e.clientX, e.clientY),
-    movePt = new DOMPoint(),
-    isPanning = false;
+  let startPt = new DOMPoint(counterRect.x + counterRect.width / 2, counterRect.y + counterRect.height / 2);
+  let movePt = new DOMPoint(mapRect.width / 2, mapRect.height / 2);
+
+  startPt = startPt.matrixTransform(inverseScreenCTM);
+  movePt = movePt.matrixTransform(inverseScreenCTM);
+
+  gb.style.transition = 'transform 0.5s';
+  gb.style.transform = mtx.multiply(getTranslateMatrix(startPt, movePt));
+  gb.addEventListener('transitionend', () => gb.style.transition = '', { once: true });
+}
+
+export default function (el) {
+  let mtx, inverseScreenCTM, startPt, movePt, isPanning;
 
   function pointerMove(e) {
     movePt.x = e.clientX;
@@ -36,7 +51,6 @@ export default function (svg, el, e) {
 
     if (!isPanning && minDistanceThresholdIsMet(startPt, movePt)) {
       isPanning = true;
-      e.target.setPointerCapture(e.pointerId);
 
       startPt.x = e.clientX;
       startPt.y = e.clientY;
@@ -54,11 +68,24 @@ export default function (svg, el, e) {
     }
   }
 
-  svg.addEventListener('pointermove', pointerMove);
+  return function(e) {
+    if (!mainButtonPressed(e)) return;
+    e.preventDefault();
+    e.target.setPointerCapture(e.pointerId);
+
+    isPanning = false;
+    mtx = getComputedTransformMatrix(el);
+    inverseScreenCTM = el.getScreenCTM().inverse();
 
-  svg.addEventListener(
-    'pointerup',
-    () => svg.removeEventListener('pointermove', pointerMove),
-    { once: true }
-  );
+    startPt = new DOMPoint(e.clientX, e.clientY);
+    movePt = new DOMPoint();
+
+    this.addEventListener('pointermove', pointerMove);
+
+    this.addEventListener(
+      'pointerup',
+      () => this.removeEventListener('pointermove', pointerMove),
+      { once: true }
+    );
+  }
 }