+/**
+ * Called in response to an interaction model operation that
+ * responds to an event that ends panning.
+ *
+ * It's used in the default callback for "mouseup" operations.
+ * Custom interaction model builders can use it to provide the default
+ * panning behavior.
+ *
+ * @param { Event } event the event object which led to the startZoom call.
+ * @param { Dygraph} g The dygraph on which to act.
+ * @param { Object} context The dragging context object (with
+ * dragStartX/dragStartY/etc. properties). This function modifies the context.
+ */
+Dygraph.Interaction.endPan = function(event, g, context) {
+ context.dragEndX = g.dragGetX_(event, context);
+ context.dragEndY = g.dragGetY_(event, context);
+
+ var regionWidth = Math.abs(context.dragEndX - context.dragStartX);
+ var regionHeight = Math.abs(context.dragEndY - context.dragStartY);
+
+ if (regionWidth < 2 && regionHeight < 2 &&
+ g.lastx_ != undefined && g.lastx_ != -1) {
+ Dygraph.Interaction.treatMouseOpAsClick(g, event, context);
+ }
+
+ // TODO(konigsberg): Clear the context data from the axis.
+ // (replace with "context = {}" ?)
+ // TODO(konigsberg): mouseup should just delete the
+ // context object, and mousedown should create a new one.
+ context.isPanning = false;
+ context.is2DPan = false;
+ context.initialLeftmostDate = null;
+ context.dateRange = null;
+ context.valueRange = null;
+ context.boundedDates = null;
+ context.boundedValues = null;
+};
+
+/**
+ * Called in response to an interaction model operation that
+ * responds to an event that starts zooming.
+ *
+ * It's used in the default callback for "mousedown" operations.
+ * Custom interaction model builders can use it to provide the default
+ * zooming behavior.
+ *
+ * @param { Event } event the event object which led to the startZoom call.
+ * @param { Dygraph} g The dygraph on which to act.
+ * @param { Object} context The dragging context object (with
+ * dragStartX/dragStartY/etc. properties). This function modifies the context.
+ */
+Dygraph.Interaction.startZoom = function(event, g, context) {
+ context.isZooming = true;
+};
+
+/**
+ * Called in response to an interaction model operation that
+ * responds to an event that defines zoom boundaries.
+ *
+ * It's used in the default callback for "mousemove" operations.
+ * Custom interaction model builders can use it to provide the default
+ * zooming behavior.
+ *
+ * @param { Event } event the event object which led to the moveZoom call.
+ * @param { Dygraph} g The dygraph on which to act.
+ * @param { Object} context The dragging context object (with
+ * dragStartX/dragStartY/etc. properties). This function modifies the context.
+ */
+Dygraph.Interaction.moveZoom = function(event, g, context) {
+ context.dragEndX = g.dragGetX_(event, context);
+ context.dragEndY = g.dragGetY_(event, context);
+
+ var xDelta = Math.abs(context.dragStartX - context.dragEndX);
+ var yDelta = Math.abs(context.dragStartY - context.dragEndY);
+
+ // drag direction threshold for y axis is twice as large as x axis
+ context.dragDirection = (xDelta < yDelta / 2) ? Dygraph.VERTICAL : Dygraph.HORIZONTAL;
+
+ g.drawZoomRect_(
+ context.dragDirection,
+ context.dragStartX,
+ context.dragEndX,
+ context.dragStartY,
+ context.dragEndY,
+ context.prevDragDirection,
+ context.prevEndX,
+ context.prevEndY);
+
+ context.prevEndX = context.dragEndX;
+ context.prevEndY = context.dragEndY;
+ context.prevDragDirection = context.dragDirection;
+};
+
+Dygraph.Interaction.treatMouseOpAsClick = function(g, event, context) {
+ var clickCallback = g.attr_('clickCallback');
+ var pointClickCallback = g.attr_('pointClickCallback');
+
+ var selectedPoint = null;
+
+ // Find out if the click occurs on a point. This only matters if there's a pointClickCallback.
+ if (pointClickCallback) {
+ var closestIdx = -1;
+ var closestDistance = Number.MAX_VALUE;
+
+ // check if the click was on a particular point.
+ for (var i = 0; i < g.selPoints_.length; i++) {
+ var p = g.selPoints_[i];
+ var distance = Math.pow(p.canvasx - context.dragEndX, 2) +
+ Math.pow(p.canvasy - context.dragEndY, 2);
+ if (closestIdx == -1 || distance < closestDistance) {
+ closestDistance = distance;
+ closestIdx = i;