I replied to the thread you mention below with the solution as well, but
here I'll paste below here as well...
Here are a few functions I wrote years ago for common chart
transformations... the function you're going to focus on for your solution
is chartToScreen...
/**
* Converts the screen position to chart value position
* @param thePos - Number - The position you want to convert
* @private
*/
private function getChartCoordinates(thePos:Point):Object
{
var tmpArray:Array =
dataTransform.invertTransform(thePos.x, thePos.y);
return {x:tmpArray[0], y:tmpArray[1]};
}
/**
* Takes a non-numeric chart value and returns a proper numeric value
* @param inValue - String - The display name of the instance showing
on the axis (eg. if we're showing months, it might be 'Sep - 06'
* @param theAxis - IAxis - The axis on which we're looking
*/
public function getNumericChartValue(inValue:String,
theAxis:IAxis):Object
{
var axisCache:Array = new Array({inValue: inValue})
if(!(theAxis is LinearAxis))
{
theAxis.mapCache(axisCache, "inValue", "outValue", true);
return {numericValue: axisCache[0].outValue}
}
else
{
return {numericValue: Number(inValue)};
}
}
/**
* Converts the chart values into screen coordinate values
* @param chartX - Number - The display name of the instance showing
on the axis (eg. if we're showing months, it might be 'Sep - 06'
* @param chartY - Number - The axis on which we're looking
*/
public function chartToScreen(chartX:Number, chartY:Number,
theSeries:Series):Point
{
var tmpCache:Array = new Array({chartX:chartX, chartY:chartY});
if(theSeries)
{
theSeries.dataTransform.transformCache(tmpCache,
"chartX", "screenX", "chartY", "screenY");
}
else
{
dataTransform.transformCache(tmpCache, "chartX",
"screenX", "chartY", "screenY");
}
return new Point(Math.round(tmpCache[0].screenX),
Math.round(tmpCache[0].screenY));
}
/**
* takes a point in mouse position, and runs it through converting to
chart coordinates, converts chart coordinate to numeric value if
needed
* and then back into mouse position to get the nearest axis snap point
* @param thePoint - Point - The position we're converting
* @private
*/
private function getSnapPosition(thePoint:Point):Point
{
var chartPoint:Object = getChartCoordinates(new
Point(thePoint.x, thePoint.y));
//if either of the axis chart results is not in numeric
format, we get the numeric equivalent of it
var chartX:* = chartPoint.x;
var chartY:* = chartPoint.y;
chartX = getNumericChartValue(chartPoint.x,
CartesianChart(this.chart).horizontalAxis).numericValue;
chartY = getNumericChartValue(chartPoint.y,
CartesianChart(this.chart).verticalAxis).numericValue;
return chartToScreen(chartX, chartY, null);
}
}
On Tue, Mar 6, 2012 at 9:28 AM, k.sigiscar <[email protected]> wrote:
> **
>
>
>
> Somebody asked the same question on the Adobe forum a while back, to no
> avail:
> http://forums.adobe.com/message/3435124
>
> Did somebody on this forum succeed in doing such a thing ?
>
>
>
