Visual Studio面板映射

Question

I have a program, where I can draw simple shapes on a panel , and it tracks my mouse movement.

 private void DrawingPanel_MouseMove(object sender, MouseEventArgs e)
 {
     toolStripStatusLabel1.Text= e.X + "," + e.Y;
 }

I was wondering if there is some way that I can "map" my panel. By mapping I mean creating areas (with rectangle coords fe) that will show some message or pop-up information on my cursor when I hover over this area.

Is it possible to do something like that?

EDIT: To be clear - I dont use mouseEvent to draw shape on my panel. I draw them with buttons created on side menu.

EDIT2: Example: I drew rectangle (10, 10, 20, 20). When i hover my mouse on those coords i would like to get a pop-up at my cursor. Somethinkg like:

System.Windows.Forms.ToolTip Rect = new System.Windows.Forms.ToolTip();
            ToolTip1.SetToolTip(this.Rect, "Reactangle 100 m2");

Answer 1

If you want to, you can create individual 'viewports' for your drawing panel.

For this your Paint event needs to set up the Graphics object and can then draw into those 'ports'.

Here is a minimal example..:

The Paint event draws the current ms into three different viewports:

private void drawPanel1_Paint(object sender, PaintEventArgs e)
{
    foreach (var v in ViewPorts)
    {
        int i = ViewPorts.IndexOf(v);
        e.Graphics.ResetClip();
        e.Graphics.ResetTransform();

        e.Graphics.SetClip(v);
        e.Graphics.TranslateTransform(v.X, v.Y);
        e.Graphics.Clear(colors[i]);
        e.Graphics.DrawString(DateTime.Now.Millisecond + "' - " +i, 
                              Font, Brushes.Black, 0,0);
    }
}

Note how I always can draw to coordinate (0,0) !

It uses a few variables:

List<Rectangle> ViewPorts = new List<Rectangle>();
List<Color> colors = new List<Color>();

Here is how I set up the lists and the animation timer:

colors.Add(Color.LightCoral);
colors.Add(Color.LightCyan);
colors.Add(Color.LightGreen);
ViewPorts.Add(new Rectangle(  0,   0, 200, 250));
ViewPorts.Add(new Rectangle(100, 100, 100,  50));
ViewPorts.Add(new Rectangle(210, 200, 100,  50));

Timer t = new Timer();
t.Interval = 250;
t.Tick += (ss, ee) => { drawPanel1.Invalidate(); };
t.Start();

You will not use a Timer but draw by changing viewport specific data and calling Invalidate on the Panel whenever the data change ..

I have added a BackColor , which, just as ForeColor , Fonts and then some, should better be part of a ViewPort class; such a class could also hold a Draw method which you would call from the panel's Paint event, passing out the e.Graphics parameter..

If you don't want/need your output to persist , which may well be the case for tooltips, you can skip the Paint event; for this case I would pass out the viewport, have a reference to the target panel in it and use CreateGraphics with pretty much the same code as above..

Answer 2

I figured that the easiest way to make a "map" of ma panel is to create areas in MouseMove event , and if a mouse move over that area the label with text is created. For example one area has coords of 100,150,200,250 and it looks like this:

 public void DrawingPanel2_MouseMove(object sender, MouseEventArgs e) 

    {
            if (e.X >= 100 && e.X <= 150 && e.Y >= 200 && e.Y <= 250)
                {
                    toolStripStatusLabel1.Text = "Point A";

                    Label lblA = new Label();
                    lblA.Text = "Point A";
                    lblA.Location = new System.Drawing.Point(e.X, e.Y);

                    lblA.AutoSize = true;
                    DrawingPanel2.Controls.Add(lblA);
                }

                else
                {
                    toolStripStatusLabel1.Text = e.X + "," + e.Y;
                    DrawingPanel2.Controls.Clear();
                }
        }