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mouse position property set mouse position according to whole screen instead current windows form

Hello I have a windows form. I want to show a popup at the position of mouse but when I get the mouse position with mouseposition property,it doesnt show right below the cursor.
When I click the cell the popup should appear right below the cursor instead it shows at random places
I have a code like this:
Point p = new Point();
p = MousePosition;
if (e.Column.Name=="colnot_detay")
{
labelControl1.Text=gridView1.GetRowCellValue(gridView1.FocusedRowHandle,"not_detay").ToString();
popupContainerControl2.Location = p;
popupContainerControl2.Show();
}

WPF C# wrong mouse coordinates

So im trying to get mouse coordinates from a click on an image, and it gives the wrong coordinates. When i move the mouse to draw, the line appears away from the cursor.
This is the code i use to get the mouse coordinates:
private void ponaredek_MouseDown(object sender, MouseButtonEventArgs e)
{
mouseDown = true;
//x1 = System.Windows.Forms.Control.MousePosition;
x1 = new System.Drawing.Point((int)e.GetPosition(this).X, (int)e.GetPosition(this).Y);
}
x1 is of type System.Drawing.Point (i need the point from drawing, to use in emgucv). What do i have to do to correct the cursor location (i drew where the cursor was)

You want to get the mouse position relative to the Image element, not the Window. So replace
e.GetPosition(this)
by
e.GetPosition((IInputElement)sender)
or
e.GetPosition(ponaredek)
if that is the Image element.
It should look like this:
var pos = e.GetPosition((IInputElement)sender);
x1 = new System.Drawing.Point(pos.X, pos.Y);
Also make sure the Image element's Stretch property is set to None.

How to solve what y axis segment was clicked in LightningChart

I've started using LightningChart in my real time monitoring application. In my app there are many y axis which use segmented layout (one y axis per segment):
mainChart.ViewXY.AxisLayout.YAxesLayout = YAxesLayout.Segmented;
My goal is that when you mouse click a segment, it gets larger compared to other segments (kinda like zoom effect) and the other segments gets smaller. When you click it again it goes back to normal.
I know I can change the size of the segments with:
mainChart.ViewXY.AxisLayout.Segments[segmentNumber].Height = someValue;
That takes care of the zooming effect.
Now the problem is that how can I solve which segment was actually clicked? I figured out that you get mouse position via MouseClick -event (e.MousePos) but that seem to give only the screen coordinates so i'm not sure that it helps.
I'm using the LightningChart version 8.4.2

You are correct that getting mouse position via MouseClick event is the key here. The screen coordinates you get via e.GetPosition (not e.MousePos) can be converted to chart axis values with CoordToValue() -method. Then you just compare the y-coordinate to each y-axis minimum/maximum value to find out what segment was clicked. Here is an example:
_chart.MouseClick += _chart_MouseClick;
private void _chart_MouseClick(object sender, MouseButtonEventArgs e)
{
var mousePos = e.GetPosition(_chart).Y;
double axisPos = 0;
bool isWithinYRange = false;
foreach (AxisY ay in _chart.ViewXY.YAxes)
{
ay.CoordToValue((float)mousePos, out axisPos, true);
if (axisPos >= ay.Minimum && axisPos <= ay.Maximum)
{
// Segment clicked, get the index via ay.SegmentIndex;
isWithinYRange = true;
}
}
if (!isWithinYRange)
{
// Not in any segment
}
}
After finding out the segment index, you can modify its height as you described:
_chart.ViewXY.AxisLayout.Segments[0].Height = 1.5;
Note Height means segment height compared to other segments.
Hope this is helpful.

Show popup at mouse location

I want to show usercontrol as popup at mouse location.
However below code doesn't work for this;
System.Drawing.Point mousePos = System.Windows.Forms.Cursor.Position;
System.Drawing.Point formPos = this.Bounds.Location;
popupChart1.ultraLabel1.Text = e.DataRow.ToString() ;
popupChart1.Location = new System.Drawing.Point(mousePos.X - formPos.X, mousePos.Y - formPos.Y);
popupChart1.Show();
It doesn't throws any error, it just show it self at another place. What could be the reason ?

You should set the location after the form is rendered.
And if you want it to show at your mouse cursor position then simply use Cursor.Position instead of the math you did
popupChart1.Show();
popupChart1.Location = Cursor.Position;
OR
if you want to set the location before you show the window you can do
popupChart1.Location = Cursor.Position;
popupChart1.StartPosition = FormStartPosition.Manual;
popupChart1.Show();

Set UI Element Position to Mouse Position

I wrote a little Program that should display a Ellipse at the exact mouse position. The Problem is that, the way Iam doing it right now , The Mouse and Ellipse Position are only exact at the center of the Screen. If I put the mouse further away to the windowborder they drift further and further away.
I use the MouseOver Element to Update the Mouse Position.
Here is my code:
private void Window_MouseMove(object sender, MouseEventArgs e)
{
Main_Grid.Children.Clear();
MousePos_Ellipse = new Ellipse();
Point MousePos_Point = new Point();
MousePos_Point = Mouse.GetPosition(Main_Grid);
Main_Grid.Children.Remove(MousePos_Ellipse);
SolidColorBrush mySolidColorBrush = new SolidColorBrush();
mySolidColorBrush.Color = Color.FromArgb(55, 255, 255, 0);
MousePos_Ellipse.Fill = mySolidColorBrush;
MousePos_Ellipse.StrokeThickness = 2;
MousePos_Ellipse.Stroke = Brushes.Black;
// Set the width and height of the Ellipse.
MousePos_Ellipse.Width = 15;
MousePos_Ellipse.Height = 15;
// At this Point I do my Positioning
MousePos_Ellipse.Margin = new Thickness(left: MousePos_Point.X - ( Main_Grid.ActualWidth / 2) , top: MousePos_Point.Y - ( Main_Grid.ActualHeight / 2 ), right: 0 , bottom: 0);
//base.AddVisualChild(_circle);
// Add the Ellipse to the Grid
Main_Grid.Children.Add(MousePos_Ellipse);
}

I propose to use a Canvas instead of a grid.
With a canvas you can simply set the ellipse position like that:
Canvas.SetLeft(MousePos_Ellipse, MousePos_Point.X);
Canvas.SetTop(MousePos_Ellipse, MousePos_Point.Y);
The Grid control will do automatic positioning and sizing of child elements and is therefore not so suitable for your goal.

Disclaimer; while the answers above will fix your issue, the actual question is not properly resolved. The problem you are facing derives from your interpretation of the issue compared to how the computer sees it.
The position of your cursor relative to the grid is not the same as the position relative to your screen (i.e. different resolutions return different values). This is why our x and y values will be further off the further you get off center. You could fix this by defining that you want your X and Y position relative to the form, f.ex, like so:
var relativePoint = this.PointToClient(Cursor.Position);
The noticable difference here is that here, we Point to the client, and therefore get the Cursor's relative position within the form.