Develop Reference

Position of curson in clickevent

I want to fetch the position of Control in which click event is performed
for this I have tried following code
Xpos = Cursor.Position.X;
Ypos = Cursor.Position.Y;
but this is giving current position of cursor. then I tried following code
MouseEventArgs m = (MouseEventArgs)e;
Xpos=m.X;
Ypos=m.Y;
but this position is not with respect to whole screen.
How I can get position of control in which click event is performed?
edit
As the link provided for duplicate ,,,,It provides position of point where click action is performed,,,,It does not provide the position of control in which click is performed.

If your project is in WindowsFormApplicaiton then
If your control is button like in screen shot
Then you can access its location wrt to its primary screen also and form screen also
Below is the code
private void button1_Click(object sender, EventArgs e)
{
//This code gives you the location of button1 wrt your primary working screen
Point location = this.PointToScreen(button1.Location);
int x1 = location.X;
int y1 = location.Y;
MessageBox.Show($"X: {x1}, Y: {y1}");
//This code gives you the location of button1 wrt your forms upper-left corner
Point relativeLoc = new Point(location.X - this.Location.X, location.Y - this.Location.Y);
int x2 = relativeLoc.X;
int y2 = relativeLoc.Y;
MessageBox.Show($"X: {x2}, Y: {y2}");
//This code gives you the location of button1 wrt your forms client area
Point relativeLoc1 = new Point(button1.Location.X, button1.Location.Y);
int x3 = relativeLoc1.X;
int y3 = relativeLoc1.Y;
MessageBox.Show($"X: {x3}, Y: {y3}");
}
In above code I used this, you can use any forms object instead as your need
Edit:
If you don't know where your control will be clicked then you have to register one event for all of your controls inside forms like
In below code i used MouseHover event but you can used any event as your need
First of all register MouseHover event for all of your controls inside Form1_Load like
private void Form1_Load(object sender, EventArgs e)
{
foreach (Control c in this.Controls)
c.MouseHover += myMouseHoverEvent;
}
Then your custom MouseHover event is
private void myMouseHoverEvent(object sender, EventArgs e)
{
Control control = sender as Control;
int x = control.Location.X;
int y = control.Location.Y;
MessageBox.Show($"X: {x}, Y: {y}");
}
Try once may it help you

Can you try this? It should return what you're expecting (Left Top Point of the control you click).
XAML:
<TextBlock Text="Sample" Width="100" Height="50"
MouseLeftButtonDown="TextBlock_MouseLeftButtonDown"/>
XAML.cs
private void TextBlock_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var control = sender as FrameworkElement;
var positionToScreen = control.PointToScreen(new Point(0, 0));
}

This code should solve your problem if you let this event handler handle the MouseClick event of all the controls you are interested in.
If you want to include the position inside the clicked control. Then add the position included in the mouse event args (Se comment in code).
private void control_MouseClick(object sender, MouseEventArgs e)
{
Control control = sender as Control;
int posX = control.Location.X;
int posY = control.Location.Y;
//Add e.X respectivly e.Y if you want to add the mouse position within the control that generated the event.
while (control.Parent != null)
{
control = control.Parent;
posX += control.Location.X;
posY += control.Location.Y;
}
((Label)sender).Text = "X: " + posX + " Y: " + posY;
}

Zoom an image in a picture box

I know there are many discussion this topic already but still i could not find an answer. Hope someone have a idea.
I load a bitmap in a PictureBox (SizeMode Normal, DockStyle Fill) and use the Paint event to draw the image.
To zoom I use MouseWheel event and increase / decrease zoom factor (Like _zoomFac += 1). The goal is to zoom at the mouse position. So in the MouseWheel event I also save the mouse position (_imageZoomLocation). This is my code (only little test implementation):
public partial class Form1 : Form
{
private Image _image;
private float _zoomFac;
private PointF _imageZoomLocation;
public Form1()
{
InitializeComponent();
_image = null;
_zoomFac = 1F;
_imageZoomLocation = PointF.Empty;
pictureBox.MouseWheel += new MouseEventHandler(OnMouseWheel);
}
private void pb_Paint(object sender, PaintEventArgs e)
{
if (_image == null)
return;
e.Graphics.TranslateTransform(-_imageZoomLocation.X + _imageZoomLocation.X / _zoomFac, -_imageZoomLocation.Y + _imageZoomLocation.Y / _zoomFac);
e.Graphics.ScaleTransform(_zoomFac, _zoomFac, MatrixOrder.Append);
e.Graphics.DrawImage(_image, new Point(0,0));
}
private void fileToolStripMenuItem_Click(object sender, EventArgs e)
{
... Code for loading image
}
private void OnMouseWheel(object sender, MouseEventArgs e)
{
if (_image == null)
return;
_imageZoomLocation = e.Location;
if (e.Delta > 0)
_zoomFac += 1F;
else
if (_zoomFac - 1F < 1F)
_zoomFac = 1F;
else
_zoomFac -= 1F;
Refresh();
}
private void pb_MouseEnter(object sender, EventArgs e)
{
pictureBox.Focus();
}
}
This works well as long as _imageZoomLocation is not changed, means the mouse is not moved i can zoom in and out perfectly (I can change mouse position when zoom factor is 1 and everything still works). However when I move the mouse to different position in a zoomed state (e.g. zoom factor is 2) and scroll, the image jumpes once to a different position than the mouse is and after this "jump" everything works well again.
Can anyone explain this behaviour?

In the following line, you are dividing imageZoomLocation.X and .Y by the zoom factor only half the time. Instead, maybe you need a separate variable to keep the previous mouse location.
e.Graphics.TranslateTransform(-_imageZoomLocation.X + _imageZoomLocation.X / _zoomFac, _
-_imageZoomLocation.Y + _imageZoomLocation.Y / _zoomFac);

MouseMove event doesn't fired with TransparencyKey

I'm creating a simple application that draws a horizontal and a vertical line following the mouse.
The form is transparent using TransparencyKey, and the lines are drawn using the Paint event:
private void Form1_Paint(object sender, PaintEventArgs e)
{
Pen pen = new Pen(Color.Lime);
e.Graphics.DrawLine(pen, 0, py, this.Size.Width, py);
e.Graphics.DrawLine(pen, px, 0, px, this.Size.Height);
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
px = e.X; // get cursor X pos
py = e.Y; // get cursor Y pos
Invalidate(); // fire Paint event
}
But the MouseMove event only is fired when the mouse is over the lines drawn. How to make the form catch mouse events when transparent? (Only the mouse move, I want the form still click-through)

As you can read here: http://msdn.microsoft.com/en-us/library/system.windows.forms.form.transparencykey%28v=vs.110%29.aspx - "Any mouse actions, such as the click of the mouse, that are performed on the transparent areas of the form will be transferred to the windows below the transparent area". One way to accomplish your goal is to write your own method, that will check the cursor relative position to the form in a loop, here's what I mean (it worked for me with TransparencyKey, resizing and moving the form):
private void MouseMovedWithTransparency()
{
Point lastCursorPos = new Point(-1, -1); // Starting point.
while (this.Visible)
{
Point currentCursorPos = Cursor.Position;
if (this.ContainsFocus && currentCursorPos.X > this.Left && currentCursorPos.X < this.Left + this.Width &&
currentCursorPos.Y > this.Top && currentCursorPos.Y < this.Top + this.Height)
{
if ((currentCursorPos.X != lastCursorPos.X) || (currentCursorPos.Y != lastCursorPos.Y))
{
// Do actions as in MouseMoved event.
// Save the new position, so it won't be triggered, when user doesn't move the cursor.
lastCursorPos = currentCursorPos;
}
}
Application.DoEvents(); // UI must be kept responsive.
Thread.Sleep(1);
}
}
All you have to do now is to invoke this method from the Shown event - this.Visible has to be true, so it's the easiest way to make it work.

I have a pictureBox1_MouseDown event and when i click the mouse left button it dosent work good

The idea is that in my program i have a button. When i click the button its drawing in the picutreBox1 paint event the point and add it on the pictureBox1 center + 10 pixels randomly around the center.
For example I clicked 5 times in a row and I see now 5 points.
In the button1 click event I also add the button location X,Y to two Lists<>
List<> X have the X location of the button and Y the Y location.
Now in the mouse down event I'm calculating the nearest point to the mouse location when I click the pictureBox1 and I also check if the lowest value distance is lower then 50 so if I click on a point ill be able to drag the point around the pictureBox1 but only if I clicked on the point somewhere between the point center and 5 pixels from the center. That way I know which point I want to drag.
In the mouse down event I also get the index of the lowest value distance and I set a flag movePoint to true and then in the mouse move event I update all the time the selectedIndex so only the selected clicked point will move. in the mouse move event I also check if the flag movePoint is true and then only start the movement.
In the mouse up I update once again the selectedIndex with the mouse location.
And I also set the flag movePoint to false.
The problem is when I'm running the program add one or more points but i don't click with the mouse on a point I click on EMPTY SPACE somewhere in the pictureBox1 and just click on it once or click and try to drag this empty space nothing happens since the flag movePoint is false.
** But in fact for some reason something does happen and if i click and drag empty space in the pictureBox1 area and then i click on one of the points and try to drag them the point jump to the location of where i dragged the empty space before !
I cant figure out why it happen. **
Its like I drag nothing its empty space i also don't see any point move. But then when I try to drag a point its jumping or another point is jumping to the location of where I ended dragging the empty space !!!!
This is the code of the mouse down mouse move mouse up and the paint events:
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
// find the index that is closest to the current mouse location
float MinDist = float.MaxValue;
for (int idx = 0; idx < Point_X.Count; ++idx)
{
float dx = Point_X[idx] - e.X;
float dy = Point_Y[idx] - e.Y;
float dist = (float)Math.Sqrt(dx * dx + dy * dy);
if (dist < MinDist)
{
MinDist = dist;
selectedIndex = idx;
}
}
if (MinDist < 5)
{
mouseMove = true;
OriginalX = Point_X[(int)selectedIndex];
OriginalY = Point_Y[(int)selectedIndex];
}
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (mouseMove == true)
{
Point NewPoint = e.Location;
Point_X[(int)selectedIndex] = NewPoint.X;
Point_Y[(int)selectedIndex] = NewPoint.Y;
pictureBox1.Refresh();
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
Point NewPoint = e.Location;
Point_X[(int)selectedIndex] = NewPoint.X;
Point_Y[(int)selectedIndex] = NewPoint.Y;
mouseMove = false;
}
private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
SolidBrush brush = new SolidBrush(Color.Red);
for (int idx = 0; idx < Point_X.Count; ++idx)
{
Point dPoint = new Point((int)Point_X[idx], (int)Point_Y[idx]);
dPoint.X = dPoint.X - 5; // was - 2
dPoint.Y = dPoint.Y - 5; // was - 2
Rectangle rect = new Rectangle(dPoint, new Size(10, 10));
g.FillEllipse(brush, rect);
}
}
** I made a small video yesterday that show the problem. look from the beginning but the problem start at second 17-19 thats where i click and drag empty space in the pictureBox1 and then try to drag the points again and cant move them and if i cant move one of them the other points jump to the location of the empty space i dragged.
http://www.youtube.com/watch?v=qZr6wdF8MNA&feature=youtu.be **

The method private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
Should contain the logic
if (mouseMove == true)
{
//Do stuff
}
That should fix the issue.

How to move PictureBox in C#?

i have used this code to move picture box on the pictureBox_MouseMove event
pictureBox.Location = new System.Drawing.Point(e.Location);
but when i try to execute the picture box flickers and the exact position cannot be identified. can you guys help me with it. I want the picture box to be steady...

You want to move the control by the amount that the mouse moved:
Point mousePos;
private void pictureBox1_MouseDown(object sender, MouseEventArgs e) {
mousePos = e.Location;
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e) {
if (e.Button == MouseButtons.Left) {
int dx = e.X - mousePos.X;
int dy = e.Y - mousePos.Y;
pictureBox1.Location = new Point(pictureBox1.Left + dx, pictureBox1.Top + dy);
}
}
Note that this code does not update the mousePos variable in MouseMove. Necessary since moving the control changes the relative position of the mouse cursor.

You have to do several things
Register the start of the moving operation in MouseDown and remember the start location of the mouse.
In MouseMove see if you are actually moving the picture. Move by keeping the same offset to the upper left corner of the picture box, i.e. while moving, the mouse pointer should always point to the same point inside the picture box. This makes the picture box move together with the mouse pointer.
Register the end of the moving operation in MouseUp.
private bool _moving;
private Point _startLocation;
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
_moving = true;
_startLocation = e.Location;
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
_moving = false;
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (_moving) {
pictureBox1.Left += e.Location.X - _startLocation.X;
pictureBox1.Top += e.Location.Y - _startLocation.Y;
}
}

Try to change SizeMode property from AutoSize to Normal