Magnet for Horz line mouse click

[georged49]

This is some bits of code from other EFS by Garth Doverspike and Steve Hare. I'm trying to draw a horizontal line at the High or Low of a bar without hitting it right on with the mouse click. I couldn't find any documentation on how the CheckNear function works..
The line draws but the magnet part does not work..

TXs to anyone who has a suggestion! Don

function preMain()
{
setPriceStudy(true);
}
function main() {
}
function onLButtonDblClk(barIndex, yValue)
{
// CheckNear function - return the OHLC value closest to the mouse click
function CheckNear(yValue, nOpen,nClose,nHigh,nLow)
{
// Is click closer to High or Low?
if (Math.abs(yValue-nHigh) <= Math.abs(yValue-nLow))
// High Wins!
yValue==nHigh;
else // Low Wins!
yValue==nLow;
}
drawLineRelative( barIndex, yValue, 10, yValue, PS_SOLID, 2, Color.blue, "Testline");


}

Hi Don,

try this...

function preMain(){
 setPriceStudy(true);
}

function main() {
} 

function onLButtonDblClk(barIndex, yValue) 
{
 yValue = checkNear(barIndex, yValue); // calls checkNear Function and assigns yValue the return value
 drawLineRelative( barIndex, yValue, 10, yValue, PS_SOLID, 2, Color.blue, "Testline");
}

// checkNear function - return the HL value closest to the mouse click
function checkNear(barIndex, yValue){ 
 var tmp = null;
 // Is click closer to High or Low?
 if (Math.abs(yValue-high(barIndex)) <= Math.abs(yValue-low(barIndex))){ // High Wins!
  tmp = high(barIndex);
 }
 else{ // Low Wins!
  tmp = low(barIndex);
 }
 return tmp;
}