Ely - Do you mean ChartItemEvent? I can't find ChartMouseEvent documented. ChartItemEvent gives me the HitData and access to the item, but I seem to lose the mouse tracking in the process.
- Tom Ely Greenfield wrote: > > > > > That depends on what you're trying to do specifically. > > The easy answer would be to say that this only works when the user > specifically clicks down and drags on an item in the chart. > > In that case, I'd modify my example below by: > > 1) listen to the chart's itemMouseDown event instead of mouseDown > 2) change the type of the event object in the mouse down handler to > ChartMouseEvent > 3) in the event object, there will be a hitData property. That should > tell you which item in your dataProvider you should be updating. > 4) store off a reference to that item. > 5) in your track function, use localToData to convert mouse > coordinates to data coordinates > 6) in track function, write those data coordinates back into the item > you stored off. > > Ely. > > > ------------------------------------------------------------------------ > *From:* [email protected] [mailto:[EMAIL PROTECTED] > *On Behalf Of *Tom Fitzpatrick > *Sent:* Wednesday, November 29, 2006 9:31 AM > *To:* [email protected] > *Subject:* Re: [flexcoders] Re: Hands-on charts > > Ely - > > Inching forward some more... > > I implemented your tracking code (very clever) but it's still unclear > how to use the Point data to rebuild the dataProvider. What is the hook > that lets the function know which item in the dataProvider array is > associated with the point data? > > - Tom > > Ely Greenfield wrote: > > > > > > Yup. To do mouse tracking, you generally need a mouse down, mouse > > move, and mouse up handler. Almost all of my code that does mouse > > tracking looks like this: > > > > > > <someComponent mouseDown="startTracking(event);" /> > > > > > > private function startTracking(e:MouseEvent):void > > { > > // listen to the systemManager so we get mouse move/up events even > > when the mouse moves outside the component. > > // listen on capture so we can cancel move/rollover events going > > to other components. > > systemManager.addEventListener(MouseEvent.MOUSE_MOVE,track,true); > > systemManager.addEventListener(MouseEvent.MOUSE_UP,endTracking,true); > > track(e); > > } > > > > private function track(e:MouseEvent):void > > { > > // update your data/UI here. > > } > > > > private function endTracking(e:MouseEvent):void > > { > > track(e); > > > > // remove the event listeners until we need to track again. > > systemManager.removeEventListener(MouseEvent.MOUSE_MOVE,track,true); > > > > > systemManager.removeEventListener(MouseEvent.MOUSE_UP,endTracking,true); > > > > } > > > > > > ---------------------------------------------------------- > > *From:* [email protected] > <mailto:flexcoders%40yahoogroups.com> > [mailto:[email protected] <mailto:flexcoders%40yahoogroups.com>] > > *On Behalf Of *Tom Fitzpatrick > > *Sent:* Tuesday, November 28, 2006 9:37 AM > > *To:* [email protected] <mailto:flexcoders%40yahoogroups.com> > > *Subject:* Re: [flexcoders] Re: Hands-on charts > > > > I'm trying out your suggested approach and ran into a conceptual > > problem. I can get the mouse coordinates and convert them to data on the > > mouseDown event - but then how do I track the mouse movement, since that > > uses a different event (mouseMove), and the function I'm working with is > > already tied to the mouseDown? The movement tracking seems necessary to > > get the "new" coordinates. > > > > - Tom > > > > Ely Greenfield wrote: > > > > > > > > > > > > It depends on just how much data you're trying to show in the chart, > > > but chances are good that it will be very responsive. > > > > > > Ely. > > > > > > > > > ---------------------------------------------------------- > > > *From:* [email protected] > <mailto:flexcoders%40yahoogroups.com> > > <mailto:flexcoders%40yahoogroups.com> > > [mailto:[email protected] > <mailto:flexcoders%40yahoogroups.com> > <mailto:flexcoders%40yahoogroups.com>] > > > *On Behalf Of *tom24569 > > > *Sent:* Monday, November 27, 2006 12:08 PM > > > *To:* [email protected] > <mailto:flexcoders%40yahoogroups.com> > <mailto:flexcoders%40yahoogroups.com> > > > *Subject:* [flexcoders] Re: Hands-on charts > > > > > > Would this happen fast enough that the chart would seem to be > > > responding to the mouse movement? > > > > > > - Tom > > > > > > --- In [email protected] > <mailto:flexcoders%40yahoogroups.com> > <mailto:flexcoders%40yahoogroups.com> > > > <mailto:flexcoders%40yahoogroups.com>, "Ely Greenfield" <[EMAIL > > > PROTECTED]> > > > wrote: > > > > > > > > > > > > > > > > Hi Tom. There's no interative modelling built in, but this should be > > > > pretty easy to do: > > > > > > > > 1) listen for itemMouseDown events. > > > > 2) track the mouse position > > > > 3) convert the mouse position into data coordinates using the > > > > chart.localToData() function. > > > > 4) write the new data coordinates into your dataProvider > > > > > > > > > > > > Ely. > > > > > > > > > > > > ________________________________ > > > > > > > > From: [email protected] > <mailto:flexcoders%40yahoogroups.com> > > <mailto:flexcoders%40yahoogroups.com> > > > <mailto:flexcoders%40yahoogroups.com> > > > [mailto:[email protected] > <mailto:flexcoders%40yahoogroups.com> > > <mailto:flexcoders%40yahoogroups.com> > > > <mailto:flexcoders%40yahoogroups.com>] On > > > > Behalf Of Tom Fitzpatrick > > > > Sent: Monday, November 27, 2006 6:34 AM > > > > To: [email protected] > <mailto:flexcoders%40yahoogroups.com> > > <mailto:flexcoders%40yahoogroups.com> > > <mailto:flexcoders%40yahoogroups.com> > > > > Subject: [flexcoders] Hands-on charts > > > > > > > > > > > > > > > > Flex charts work beautifully responding to dynamic changes in data. > > > > > > > > Using the current components, is there any way to use Flex charts to > > > > change data? > > > > > > > > As a conceptual model, I'm thinking of the way parametric equalizers > > > > work in some audio programs, where it's possible to drag nodes on > > a line > > > > > > > > graph vertically or horizontally to change the parametric data. > > > > > > > > - Tom > > > > > > > > > > > > > > > >
