C#•4d ago

Windows Forms drawing not saving

When im drawing on the picturebox (pageImage) and im saving, the data is not saved

12 Replies

Silme94OP•4d ago

how i create Graphics instance

g = pageImage.CreateGraphics();

g = pageImage.CreateGraphics();

private bool isDrawing = false;
private Point pos;
private Pen drawingPen;


private void PageImage_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left) 
    {
        isDrawing = true;
        pos.X = e.X;
        pos.Y = e.Y;
    }
}

private void PageImage_MouseDrawMove(object sender, MouseEventArgs e)
{
    if (isDrawing)
    {
        g.DrawLine(drawingPen, pos, e.Location);

        pos = e.Location;
    }
}

private void PageImage_MouseUp(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        isDrawing = false;


        Bitmap bitmap = new Bitmap(pageImage.Image);
        bitmap.Save(pageImage.ImageLocation);
    }
}

private bool isDrawing = false;
private Point pos;
private Pen drawingPen;


private void PageImage_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left) 
    {
        isDrawing = true;
        pos.X = e.X;
        pos.Y = e.Y;
    }
}

private void PageImage_MouseDrawMove(object sender, MouseEventArgs e)
{
    if (isDrawing)
    {
        g.DrawLine(drawingPen, pos, e.Location);

        pos = e.Location;
    }
}

private void PageImage_MouseUp(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        isDrawing = false;


        Bitmap bitmap = new Bitmap(pageImage.Image);
        bitmap.Save(pageImage.ImageLocation);
    }
}

look at PageImage_MouseUp event im able to draw on the window, but when it comes to save, it does not work

MonJamp•4d ago

~~Does isDrawing ever get set to false?~~ nvm Can you clarify "does not work"? Does a bitmap image at least get created?

Silme94OP•4d ago

the image does not change, it keep original and the drawing does not affect like on the picturebox i see that i drew but when it comes to save it to a file the changes dont applies

MonJamp•4d ago

When you are drawing, I believe the drawing data gets saved to the g object. When you save, it looks like you're just saving the page but that doesn't contain the data which you drew Maybe I'm wrong?

Silme94OP•4d ago

i think so, but then how can i save the Graphics too?

MonJamp•4d ago

Are you able to convert g to a bitmap or image object?

Silme94OP•4d ago

uh i think

Silme94OP•4d ago

https://stackoverflow.com/questions/1535730/convert-graphics-object-to-bitmap-object

Stack Overflow

Convert graphics object to bitmap object

How can I convert graphics object to bitmap object using C#?

MonJamp•4d ago

https://learn.microsoft.com/en-us/dotnet/api/system.drawing.graphics?view=windowsdesktop-7.0

Graphics Class (System.Drawing)

Encapsulates a GDI+ drawing surface. This class cannot be inherited.

MonJamp•4d ago

Check out the documentation, I'm sure one of the methods will help you out here The second answer in the stackoverflow page sounds promising: Bitmap bmp = new Bitmap(100,100,graphics);

Silme94OP•4d ago

@MonJamp it just save a blank page Bitmap bitmap = new Bitmap(pageImage.Width, pageImage.Height, g); without the drawing man idk thank you for trying to help

MonJamp•4d ago

For sure There are many different ways you could go about to implement this, I'm not too familiar with how to use the Graphics object but maybe the best approach would be to save the pixel data in an array as you're drawing - just an idea Good luck

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Windows Forms drawing not saving