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Added comments to the MCTPinch file.
This commit is contained in:
Shivam Dave 2015-09-02 12:58:56 -07:00
parent f9be00a70f
commit 052a359738
1 changed files with 35 additions and 6 deletions
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41
platform/features/plot-reborn/src/directives/MCTPlot.js
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@ -151,7 +151,8 @@ define(
dragStart = undefined;
$scope.$emit('user:viewport:change:end', $scope.viewport);
}
//
function trackTouchPosition(touchPosition, bounds) {
var positionOverElement,
positionAsPlotPoint,
@ -273,12 +274,17 @@ define(
updateAxesForCurrentViewport();
}
//
// Updates viewport based on touch location and current event bounds
function updatePan(touch, bounds) {
// Sets the panPosition plot point (relative to chart)
// and calculates domain/range by subtracting first touch's
// plot point and current touch's plot point
var panPosition = trackTouchPosition(touch, bounds).positionAsPlotPoint,
dDomain = firstTouch.domain - panPosition.domain,
dRange = firstTouch.range - panPosition.range;
// Viewport is set to calculated delta domain/range
$scope.viewport = {
topLeft: {
domain: (($scope.viewport.topLeft.domain) + dDomain),
@ -291,20 +297,26 @@ define(
};
}
// Starts the pan by emitting that viewport will be changed
// also sets the first touch variable
function startPan(touch, bounds) {
$scope.$emit('user:viewport:change:start');
firstTouch = trackTouchPosition(touch, bounds).positionAsPlotPoint;
}
//
//Receives the emit of single touch pan start
function onPanStart(event, touch) {
startPan(touch.touch, touch.bounds);
}
//Receives the emit of single touch pan change
function onPanChange(event, touch) {
updatePan(touch.touch, touch.bounds);
}
// Sets the dimensions of the midpoint's domain and range distance to the
// top left and bottom right corners of the viewport. Used to zoom relative to
// midpoint pinch gestures 2 touches.
function setDimensions(midpoint) {
return {
tl: {
@ -318,13 +330,21 @@ define(
};
}
// Calculates the viewport for a zoom gesture
function calculateViewport(midpoint, ratio) {
// Uses the distance ratio passed in and the
// zoom amount (variable set at top) to find the
// amount of zoom per change in pinch gesture and
// whether it is zooming in or out
var zoomTL, zoomBR,
dimensions = setDimensions(midpoint),
checkRatio = (ratio - 1) || 0,
type = (-1 * (checkRatio / Math.abs(checkRatio))) || 1,
zoomAmt = type * ZOOM_AMT;
// Sets the domain/range difference to applied to the
// top left and bottom right plot points
zoomTL = {
domain: zoomAmt * dimensions.tl.domain,
range: zoomAmt * dimensions.tl.range
@ -334,6 +354,8 @@ define(
range: zoomAmt * dimensions.br.range
};
// Applies and returns the changed for zoom top left and bottom right
// plot points
return {
topLeft: {
domain: (($scope.viewport.topLeft.domain) + zoomTL.domain),
@ -346,21 +368,28 @@ define(
};
}
// Updates the viewport based on the amount of zooming (pinching) user is doing
function updateZoom(midpoint, bounds, distance) {
// Gets the current midpoint and distance ratio to be used to
// calculate new viewport
var midpointPosition = trackTouchPosition(midpoint, bounds).positionAsPlotPoint,
distanceRatio = ((prevTouchDistance || firstTouchDistance) / distance);
// Sets the new viewport
$scope.viewport = calculateViewport(midpointPosition, distanceRatio);
}
// Starts the zoom by emitting that viewport will be changed
// also sets the first touch variable (midpoint) if panning will happen
// and sets the distance between the first touches occurring
function startZoom(midpoint, bounds, touches, distance) {
$scope.$emit('user:viewport:change:start');
firstTouchDistance = distance;
firstTouch = trackTouchPosition(midpoint, bounds).positionAsPlotPoint;
}
//
function onPinchStart(event, touch) {
$scope.$emit('user:viewport:change:start');
startZoom(touch.midpoint, touch.bounds, touch.touches, touch.distance);
}