Forums - C# Corner

Forum guidelines
learner learner

learner learner

  • 1.3k
  • 29
  • 121k

Crop area selection control(like photoshop's) in c# windows form

Mar 7 2012 8:34 AM
how to develop a crop selection control like photoshop's in c# 4.0 in widows form application.

I have a windows form application in c# 4.0 that can crop images. At first you have to draw a rectangle using mouse to select the cropped region.

 private Point _pt;
private Point _pt2;
private void picBoxImageProcessing_MouseDown(object sender, MouseEventArgs e)
{

if (e.Button == MouseButtons.Left)
{
int ix = (int)(e.X / _zoom);
int iy = (int)(e.Y / _zoom);

//reset _pt2
       _pt2
= new Point(0, 0);
       _pt
= new Point(ix, iy);

// pictureBox1.Invalidate();
       picBoxImageProcessing
.Invalidate();
}
}

private void picBoxImageProcessing_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left && _selecting)
{
       _selecting
= false;
}
}

private void picBoxImageProcessing_Paint(object sender, PaintEventArgs e)
{


if (_selecting &&_pt.X >= 0 && _pt.Y >= 0 && _pt2.X >= 0 && _pt2.Y >= 0)
{

            e
.Graphics.DrawRectangle(pen, _pt.X * _zoom, _pt.Y * _zoom,
(_pt2.X - _pt.X) *         _zoom, (_pt2.Y - _pt.Y) * _zoom);
}
}

private void picBoxImageProcessing_MouseMove(object sender, MouseEventArgs e)
{


if (e.Button == MouseButtons.Left)
{
         _selecting
= true;
int ix = (int)(e.X / _zoom);
int iy = (int)(e.Y / _zoom);

         _pt2
= new Point(ix, iy);

//  pictureBox1.Invalidate();
           picBoxImageProcessing
.Invalidate();
}
}

there is no problem to draw the rectangle by mouse dragging. But if i want to change the height or width of the rectangle then I have to draw a new rectangle, that i don't want. I want to change the height and width of the rectangle by modifying the drawn rectangle instead of drawing a new rectangle.

I don't want to know how to crop. I need to draw a resizable rectangle on the image as we can do in photoshop.

So I need a crop selection control like photoshop's crop control.




Unlimited Flat-Free License

SPONSORED BY

File APIs for .NET
Aspose are the market leader of .NET APIs for file business formats – natively work with DOCX, XLSX, PPT, PDF, MSG, MPP, images formats and many more!