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c3_chart_internal_fn.initZoom = function () {
var $$ = this, d3 = $$.d3, config = $$.config, startEvent;
$$.zoom = d3.behavior.zoom()
.on("zoomstart", function () {
startEvent = d3.event.sourceEvent;
$$.zoom.altDomain = d3.event.sourceEvent.altKey ? $$.x.orgDomain() : null;
config.zoom_onzoomstart.call($$.api, d3.event.sourceEvent);
})
.on("zoom", function () {
$$.redrawForZoom.call($$);
})
.on('zoomend', function () {
var event = d3.event.sourceEvent;
// if click, do nothing. otherwise, click interaction will be canceled.
if (event && startEvent.clientX === event.clientX && startEvent.clientY === event.clientY) {
return;
}
$$.redrawEventRect();
$$.updateZoom();
config.zoom_onzoomend.call($$.api, $$.x.orgDomain());
});
$$.zoom.scale = function (scale) {
return config.axis_rotated ? this.y(scale) : this.x(scale);
};
$$.zoom.orgScaleExtent = function () {
var extent = config.zoom_extent ? config.zoom_extent : [1, 10];
return [extent[0], Math.max($$.getMaxDataCount() / extent[1], extent[1])];
};
$$.zoom.updateScaleExtent = function () {
var ratio = diffDomain($$.x.orgDomain()) / diffDomain($$.orgXDomain),
extent = this.orgScaleExtent();
this.scaleExtent([extent[0] * ratio, extent[1] * ratio]);
return this;
};
};
c3_chart_internal_fn.updateZoom = function () {
var $$ = this, z = $$.config.zoom_enabled ? $$.zoom : function () {};
$$.main.select('.' + CLASS.zoomRect).call(z).on("dblclick.zoom", null);
$$.main.selectAll('.' + CLASS.eventRect).call(z).on("dblclick.zoom", null);
};
c3_chart_internal_fn.redrawForZoom = function () {
var $$ = this, d3 = $$.d3, config = $$.config, zoom = $$.zoom, x = $$.x;
if (!config.zoom_enabled) {
return;
}
if ($$.filterTargetsToShow($$.data.targets).length === 0) {
return;
}
if (d3.event.sourceEvent.type === 'mousemove' && zoom.altDomain) {
x.domain(zoom.altDomain);
zoom.scale(x).updateScaleExtent();
return;
}
if ($$.isCategorized() && x.orgDomain()[0] === $$.orgXDomain[0]) {
x.domain([$$.orgXDomain[0] - 1e-10, x.orgDomain()[1]]);
}
$$.redraw({
withTransition: false,
withY: config.zoom_rescale,
withSubchart: false,
withEventRect: false,
withDimension: false
});
if (d3.event.sourceEvent.type === 'mousemove') {
$$.cancelClick = true;
}
config.zoom_onzoom.call($$.api, x.orgDomain());
};
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