X-Git-Url: https://git-public.kairo.at/?p=lantea.git;a=blobdiff_plain;f=js%2Fmap.js;h=5c93ae5741dbf71885253461fbe3e7b6e2a4cd32;hp=3cc00c5384c6fd6b97bbf00496a5d91404819f6b;hb=362a6833c5e41dc0d006667b4ef8bb15d898dc4b;hpb=6ddefbf98ebff13592de1d87a3bfc2796ac06d84

diff --git a/js/map.js b/js/map.js
index 3cc00c5..5c93ae5 100644
--- a/js/map.js
+++ b/js/map.js
@@ -61,7 +61,7 @@ var gLoadingTile;
 var gMapPrefsLoaded = false;
 
 var gDragging = false;
-var gDragTouchID;
+var gDragTouchID, gPinchStartWidth;
 
 var gGeoWatchID;
 var gTrack = [];
@@ -163,13 +163,17 @@ function loadPrefs(aEvent) {
     });
     gWaitCounter++;
     var trackLoadStarted = false;
+    var redrawBase = 100;
     gTrackStore.getListStepped(function(aTPoint) {
       if (aTPoint) {
         // Add in front and return new length.
         var tracklen = gTrack.unshift(aTPoint);
-        // Redraw track every 100 values (initial paint will do first anyhow).
-        if (tracklen % 100 == 0)
+        // Redraw track periodically, larger distance the longer it gets.
+        // Initial paint will do initial track drawing.
+        if (tracklen % redrawBase == 0) {
           drawTrack();
+          redrawBase = tracklen;
+        }
       }
       else {
         // Last point received.
@@ -482,6 +486,14 @@ var mapEvHandler = {
       case "mousedown":
       case "touchstart":
         if (touchEvent) {
+          if (aEvent.targetTouches.length == 2) {
+            gPinchStartWidth = Math.sqrt(
+                Math.pow(aEvent.targetTouches.item(1).clientX -
+                         aEvent.targetTouches.item(0).clientX, 2) +
+                Math.pow(aEvent.targetTouches.item(1).clientY -
+                         aEvent.targetTouches.item(0).clientY, 2)
+            );
+          }
           gDragTouchID = aEvent.changedTouches.item(0).identifier;
           coordObj = aEvent.changedTouches.identifiedTouch(gDragTouchID);
         }
@@ -497,6 +509,47 @@ var mapEvHandler = {
         break;
       case "mousemove":
       case "touchmove":
+        if (touchEvent && aEvent.targetTouches.length == 2) {
+          curPinchStartWidth = Math.sqrt(
+              Math.pow(aEvent.targetTouches.item(1).clientX -
+                       aEvent.targetTouches.item(0).clientX, 2) +
+              Math.pow(aEvent.targetTouches.item(1).clientY -
+                       aEvent.targetTouches.item(0).clientY, 2)
+          );
+          if (!gPinchStartWidth)
+            gPinchStartWidth = curPinchStartWidth;
+
+          if (gPinchStartWidth / curPinchStartWidth > 1.7 ||
+              gPinchStartWidth / curPinchStartWidth < 0.6) {
+            var newZoomLevel = gPos.z + (gPinchStartWidth < curPinchStartWidth ? 1 : -1);
+            if ((newZoomLevel >= 0) && (newZoomLevel <= gMaxZoom)) {
+              // Calculate new center of the map - preserve middle of pinch.
+              // This means that pixel distance between old center and middle
+              // must equal pixel distance of new center and middle.
+              var x = (aEvent.targetTouches.item(1).clientX +
+                       aEvent.targetTouches.item(0).clientX) / 2 -
+                      gMapCanvas.offsetLeft;
+              var y = (aEvent.targetTouches.item(1).clientY +
+                       aEvent.targetTouches.item(0).clientY) / 2 -
+                      gMapCanvas.offsetTop;
+
+              // Zoom factor after this action.
+              var newZoomFactor = Math.pow(2, gMaxZoom - newZoomLevel);
+              gPos.x -= (x - gMapCanvas.width / 2) * (newZoomFactor - gZoomFactor);
+              gPos.y -= (y - gMapCanvas.height / 2) * (newZoomFactor - gZoomFactor);
+
+              if (gPinchStartWidth < curPinchStartWidth)
+                zoomIn();
+              else
+                zoomOut();
+
+              // Reset pinch start width and start another pinch gesture.
+              gPinchStartWidth = null;
+            }
+          }
+          // If we are in a pinch, do not drag.
+          break;
+        }
         var x = coordObj.clientX - gMapCanvas.offsetLeft;
         var y = coordObj.clientY - gMapCanvas.offsetTop;
         if (gDragging === true) {
@@ -525,6 +578,7 @@ var mapEvHandler = {
         break;
       case "mouseup":
       case "touchend":
+        gPinchStartWidth = null;
         gDragging = false;
         showUI();
         break;