log pinch widths

[lantea.git] / js / map.js

diff --git a/js/map.js b/js/map.js
index 41a413d7aa1481e1c6cdf41c9e75663c35d9afd3..77585e27c7eb345cfbc7c346259537f23d50b7bc 100644 (file)
--- 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 = [];
@@ -162,15 +162,26 @@ function loadPrefs(aEvent) {
       gAction.dispatchEvent(throwEv);
     });
     gWaitCounter++;
-    gTrackStore.getList(function(aTPoints) {
-      if (gDebug)
-        console.log(aTPoints.length + " points loaded.");
-      if (aTPoints.length) {
-        gTrack = aTPoints;
+    var trackLoadStarted = false;
+    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)
+          drawTrack();
+      }
+      else {
+        // Last point received.
+        drawTrack();
+      }
+      if (!trackLoadStarted) {
+        // We have the most recent point, if present, rest will load async.
+        trackLoadStarted = true;
+        gWaitCounter--;
+        var throwEv = new CustomEvent("prefs-step");
+        gAction.dispatchEvent(throwEv);
       }
-      gWaitCounter--;
-      var throwEv = new CustomEvent("prefs-step");
-      gAction.dispatchEvent(throwEv);
     });
   }
 }
@@ -355,6 +366,10 @@ function drawMap(aPixels, aOverdraw) {
       }
     }
   }
+  drawTrack();
+}
+
+function drawTrack() {
   gLastDrawnPoint = null;
   gCurPosMapCache = undefined;
   gTrackContext.clearRect(0, 0, gTrackCanvas.width, gTrackCanvas.height);
@@ -467,6 +482,15 @@ 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)
+            );
+            console.log('!!!' + gPinchStartWidth);
+          }
           gDragTouchID = aEvent.changedTouches.item(0).identifier;
           coordObj = aEvent.changedTouches.identifiedTouch(gDragTouchID);
         }
@@ -482,6 +506,41 @@ 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)
+          );
+          console.log(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();
+            }
+          }
+          break;
+        }
         var x = coordObj.clientX - gMapCanvas.offsetLeft;
         var y = coordObj.clientY - gMapCanvas.offsetTop;
         if (gDragging === true) {
@@ -756,7 +815,7 @@ function endTracking() {
 function clearTrack() {
   gTrack = [];
   gTrackStore.clear();
-  drawMap({left: 0, right: 0, top: 0, bottom: 0});
+  drawTrack();
 }
 
 var gTileService = {