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Added comments to the MCTPinch file.
This commit is contained in:
Shivam Dave 2015-09-02 13:37:17 -07:00
parent 908fbdbf73
commit 7288db1908
1 changed files with 21 additions and 8 deletions
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29
platform/features/plot-reborn/src/directives/MCTPlot.js
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@ -304,12 +304,12 @@ define(
firstTouch = trackTouchPosition(touch, bounds).positionAsPlotPoint; firstTouch = trackTouchPosition(touch, bounds).positionAsPlotPoint;
} }
//Receives the emit of single touch pan start // Receives the emit of single touch pan start
function onPanStart(event, touch) { function onPanStart(event, touch) {
startPan(touch.touch, touch.bounds); startPan(touch.touch, touch.bounds);
} }
//Receives the emit of single touch pan change // Receives the emit of single touch pan change
function onPanChange(event, touch) { function onPanChange(event, touch) {
updatePan(touch.touch, touch.bounds); updatePan(touch.touch, touch.bounds);
} }
@ -381,16 +381,17 @@ define(
} }
// Starts the zoom by emitting that viewport will be changed // Starts the zoom by emitting that viewport will be changed
// also sets the first touch variable (midpoint) if panning will happen // also sets the first touch variable (midpoint) if panning will
// and sets the distance between the first touches occurring // happen and sets the distance between the first touches occurring
function startZoom(midpoint, bounds, touches, distance) { function startZoom(midpoint, bounds, distance) {
$scope.$emit('user:viewport:change:start'); $scope.$emit('user:viewport:change:start');
firstTouchDistance = distance; firstTouchDistance = distance;
firstTouch = trackTouchPosition(midpoint, bounds).positionAsPlotPoint; firstTouch = trackTouchPosition(midpoint, bounds).positionAsPlotPoint;
} }
// Receives the emit of the start of pinch touch
function onPinchStart(event, touch) { function onPinchStart(event, touch) {
startZoom(touch.midpoint, touch.bounds, touch.touches, touch.distance); startZoom(touch.midpoint, touch.bounds, touch.distance);
} }
function comparePinchDrag(distance, prevDistance) { function comparePinchDrag(distance, prevDistance) {
@ -398,17 +399,29 @@ define(
((prevDistance - PINCH_DRAG_AMT) <= distance); ((prevDistance - PINCH_DRAG_AMT) <= distance);
} }
// Receives the emit of the change of pinch touch,
// differentiates between a pan and zoom
function onPinchChange(event, touch) { function onPinchChange(event, touch) {
// Will pan if change in distance is within PINCH_DRAG_AMT
// range relative to the previous distance
if(comparePinchDrag(Math.round(touch.distance), if(comparePinchDrag(Math.round(touch.distance),
Math.round(prevTouchDistance || firstTouchDistance))) { Math.round(prevTouchDistance || firstTouchDistance))) {
updatePan(touch.midpoint, touch.bounds); updatePan(touch.midpoint, touch.bounds);
} else { }
// Will pinch in any other situation that the distance between
// pinching touches is increasing or decreasing by more than
// PINCH_DRAG_AMT
else {
updateZoom(touch.midpoint, touch.bounds, touch.distance); updateZoom(touch.midpoint, touch.bounds, touch.distance);
} }
// Sets previous touch distance to current touch.distance
prevTouchDistance = touch.distance; prevTouchDistance = touch.distance;
} }
// // Receives emit for touch event ending and emits that the
// viewport has stopped changing.
function onTouchEnd() { function onTouchEnd() {
$scope.$emit('user:viewport:change:end', $scope.viewport); $scope.$emit('user:viewport:change:end', $scope.viewport);
} }