button and rectangle size are not as expected

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I have a Rectangle tmprect,then with it, I have drawn a rectangle as well as a button.
both of them have a same size. but actually the output of the button shows much smaller size than rectangle. I do not know why? Anyone can give me a hint?
whether here the unit are different for them?

//draw a rectangle
graphics.DrawRectangle(tmppen, tmprect.X, tmprect.Y, tmprect.Width, tmprect.Height);

//add a button
Button btn = new Button();
btn.Location = new Point(tmprect.X, tmprect.Y);
btn.Size = new Size(tmprect.Width, tmprect.Height);
this.Controls.Add(btn);

Posted 9-Jul-12 10:20am

Seraph_summer

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[no name] 9-Jul-12 16:48pm

I suspect that the difference in size is due to the size of the width of the pen that you are using to draw the rectangle.

Seraph_summer 9-Jul-12 17:07pm

no, pen's width is independent on rect size.

[no name] 9-Jul-12 17:17pm

Define "much smaller size than rectangle".... In my test code, the button was exactly smaller than the rectangle by the width of the pen. So you are using a pen to draw the rectangle are you not?

Seraph_summer 9-Jul-12 17:22pm

I do not understand what you mean, you mean if I change the widht of the pen, then rectangle's size will be changed? no, I do not think so, the pen width only change the line width and not the rectangle's width and height, right?

[no name] 9-Jul-12 17:28pm

No and I never said that. The pen and rectangle are 2 different things.

Seraph_summer 9-Jul-12 17:24pm

you mean the button size is only smaller than the rectangle by the width of the pen? really?, mine case: much smaller!

[no name] 9-Jul-12 17:26pm

How much is much smaller? Where is the code that demonstrates this issue? My code is the same as your code and the button is the exact same size as the rectangle.

Seraph_summer 10-Jul-12 13:52pm

thanks, you are right. actually, I found out the reason is the e.Graphics.PageUnit.

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Trak4Net · Accepted Answer · 2012-07-09T17:03:00

I think it might have something to do with how you are getting your graphics object. Using the graphics object from the paint eventargs has different results than using this.CreateGraphics. If you do NOT enable visual styles for the application then the results are the same.

C#

[STAThread]
static void Main()
{
    //Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
}

just by enabling/disabling visual styles you can see a difference

private void Form1_Paint(object sender, PaintEventArgs e)
       {

           //second graphics option
           System.Drawing.Graphics graphics = this.CreateGraphics();


           System.Drawing.Pen tmppen = new Pen(new SolidBrush(Color.Red), 2);

           System.Drawing.Rectangle tmprect = new Rectangle(5, 5, 125, 25);
           System.Drawing.Rectangle tmprect2 = new Rectangle(150, 5, 125, 25);

           //draw a rectangle
           e.Graphics.PageUnit = GraphicsUnit.Display;

           e.Graphics.DrawRectangle(tmppen, tmprect.X, tmprect.Y, tmprect.Width, tmprect.Height);
           graphics.DrawRectangle(tmppen, tmprect2.X, tmprect2.Y, tmprect2.Width, tmprect2.Height);

           //add a button
           Button btn = new Button();
           btn.Location = new Point(tmprect.X, tmprect.Y);
           btn.Size = new Size(tmprect.Width, tmprect.Height);
           btn.Text = e.Graphics.PageUnit.ToString() + e.Graphics.PageScale.ToString() + " " + e.Graphics.DpiX + "x" + e.Graphics.DpiY;
           this.Controls.Add(btn);

           Button btn2 = new Button();
           btn2.Location = new Point(tmprect2.X, tmprect2.Y);
           btn2.Size = new Size(tmprect2.Width, tmprect2.Height);
           btn2.Text = graphics.PageUnit.ToString() + graphics.PageScale.ToString() + " " + graphics.DpiX + "x" + graphics.DpiY;
           this.Controls.Add(btn2);



       }