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Snapfit to near by grid lines #22

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Snapfit to near by grid lines #22

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27 changes: 23 additions & 4 deletions draggable-points.js
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Original file line number Diff line number Diff line change
Expand Up @@ -33,8 +33,21 @@
dragX,
dragY,
dragPlotX,
dragPlotY;

dragPlotY,
//Change this flag to enable snap fit - neary by grid lines
snapToFit = false;
/*
* Get closest point of given tickPositions
*/
function getSnapPoint(points, goal) {
var closest = null;
for (i = 0; i < points.length; i++) {
if (closest == null || Math.abs(points[i] - goal) < Math.abs(closest - goal)) {
closest = points[i];
}
}
return closest;
}
function mouseDown(e) {
var hoverPoint = chart.hoverPoint,
options,
Expand Down Expand Up @@ -85,7 +98,10 @@

newX = filterRange(newX, series, 'X');
newY = filterRange(newY, series, 'Y');


if(snapToFit)
newY = getSnapPoint(chart.yAxis[0].tickPositions, newY);

// Fire the 'drag' event with a default action to move the point.
dragPoint.firePointEvent(
'drag', {
Expand Down Expand Up @@ -141,7 +157,10 @@

newX = filterRange(newX, series, 'X');
newY = filterRange(newY, series, 'Y');


if(snapToFit)
newY = getSnapPoint(chart.yAxis[0].tickPositions, newY);

dragPoint.update({
x: draggableX ? newX : dragPoint.x,
y: draggableY ? newY : dragPoint.y
Expand Down