-Dygraph.prototype.idxToRow_ = function(idx) {
- if (idx < 0) return -1;
-
- // make sure that you get the boundaryIds record which is also defined (see bug #236)
- var boundaryIdx = -1;
- for (var i = 0; i < this.boundaryIds_.length; i++) {
- if (this.boundaryIds_[i] !== undefined) {
- boundaryIdx = i;
- break;
+Dygraph.prototype.findStackedPoint = function(domX, domY) {
+ var row = this.findClosestRow(domX);
+ var boundary = this.getLeftBoundary_();
+ var rowIdx = row - boundary;
+ var sets = this.layout_.points;
+ var closestPoint, closestSeries;
+ for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
+ var points = this.layout_.points[setIdx];
+ if (rowIdx >= points.length) continue;
+ var p1 = points[rowIdx];
+ if (!Dygraph.isValidPoint(p1)) continue;
+ var py = p1.canvasy;
+ if (domX > p1.canvasx && rowIdx + 1 < points.length) {
+ // interpolate series Y value using next point
+ var p2 = points[rowIdx + 1];
+ if (Dygraph.isValidPoint(p2)) {
+ var dx = p2.canvasx - p1.canvasx;
+ if (dx > 0) {
+ var r = (domX - p1.canvasx) / dx;
+ py += r * (p2.canvasy - p1.canvasy);
+ }
+ }
+ } else if (domX < p1.canvasx && rowIdx > 0) {
+ // interpolate series Y value using previous point
+ var p0 = points[rowIdx - 1];
+ if (Dygraph.isValidPoint(p0)) {
+ var dx = p1.canvasx - p0.canvasx;
+ if (dx > 0) {
+ var r = (p1.canvasx - domX) / dx;
+ py += r * (p0.canvasy - p1.canvasy);
+ }
+ }