drawText method
Implementation
@override
void drawText(Canvas canvas, KLineEntity data, double x) {
if (isLongPress) {
var index = calculateSelectedX(selectX);
data = getItem(index);
}
mMainRenderer.drawText(canvas, data, x);
mVolRenderer?.drawText(canvas, data, x);
mSecondaryRenderer?.drawText(canvas, data, x);
}