Clear all Bitmap drawings using push button

Question

I made several drawings using Windows forms application visual studio Bitmap, my goal is to clear all drawings when I press the push button (make the background clear) The Following code is not exactly what my original code but this is how I created each drawing

Rectangle area;
Bitmap creature;//this only one drawing but I have several
Graphics scG;
Bitmap background;
private void Form1_Load(object sender, EventArgs e)
{
  background = new Bitmap(Width, Height);
  area = new Rectangle(50, 50, 50, 50);
  creature = new Bitmap(@"C:\Users\Desktop\Image.png");
}

public Bitmap Draw()
{
  Graphics scG = Graphics.FromImage(background);
  scG.DrawImage(creature, area);

        return background;
    }
}

private void Button_Click(object sender, EventArgs e)
{
  // I want to clear all the drawings by push this button
}

Since you are drawing into a Bitmap you created from scratch you just fill that Bitmap with a Color, like white or transparent: graphics.Clear(yourColor) or re-create it from scratch. You can't take back a single drawing, though. You need to cache the previous step if you need that. — TaW, Jul 09 '16 at 05:47

Tommy · Answer 1 · 2016-07-09T06:55:34.850

1

There is no way to remove things drawn on a bitmap.

Why don't just dump the old background bitmap and create a new one?

edited Jul 09 '16 at 06:55

answered Jul 09 '16 at 06:27

Tommy

3,044
1
14
13

How can I do that? – Mohanad Al Nuaimi Jul 09 '16 at 06:29
Dump by `background.Dispose` and then create a new one like you did in `Form1_Load` – Tommy Jul 09 '16 at 06:30

score 0 · Answer 2 · answered Jul 09 '16 at 03:48

0

The real way is to use event Paint:

private void Form1_Paint(object sender, PaintEventArgs e)
{
  e.Graphics.DrawImage(creature, area); // draw your image here...
}

To delete, just do nothing in Form1_Paint, and call Refresh();

answered Jul 09 '16 at 03:48

1

No, it is perfectly fine to draw into a Bitmap. – TaW Jul 09 '16 at 05:46

score 0 · Accepted Answer · edited May 23 '17 at 10:28

0

this is duplicate , see this link : How to delete a drawn circle in c# windows form?

or test these Code :

Graphics.Clear();

or

Control.Invalidate();

or

this.Invalidate();

edited May 23 '17 at 10:28

Community

1
1

answered Jul 09 '16 at 03:49

mohammad

275
3
16

no one of these does work with my code I got an error: there is no argument given that corresponds to the required formal parameter 'color' of 'Graphic.Clear (Color)' – Mohanad Al Nuaimi Jul 09 '16 at 04:55
@MohanadAlNuaimi use two button , first for drow and secont for clean , remove anything in form load and paste in first and in the second button white this.Invalidate(); – mohammad Jul 09 '16 at 05:18
I found a way to solve the problem, Thank you for trying to help – Mohanad Al Nuaimi Jul 09 '16 at 08:23

Clear all Bitmap drawings using push button

3 Answers3