CODEWITHSUNDEEP
c#visual-studioscrollzoomingmousewheel
Wedge
Wedge

Reputation: 141

How to zoom with scroll wheel

I have a windows forms project in which I want to implement scrolling. I attempted to use the second answer from this question

so now my code looks like this:

  void pictureBox1_MouseWheel(object sender, MouseEventArgs e)
  {

      if (e.Delta != 0)
      {
          if (e.Delta <= 0)
          {
              //set minimum size to zoom
              if (pictureBox1.Width < 50)
                  return;
          }
          else
          {
              //set maximum size to zoom
              if (pictureBox1.Width > 500)
                  return;
          }
          pictureBox1.Width += Convert.ToInt32(pictureBox1.Width * e.Delta / 1000);
          pictureBox1.Height += Convert.ToInt32(pictureBox1.Height * e.Delta / 1000);
      }

but it only behaves like this

Upvotes: 3

Views: 665

Answers (1)

Jason Allen
Jason Allen

Reputation: 813

This depends on the SizeMode of your PictureBox. By default, this is the enum Normal. Given your demonstration, I suggest you use the Zoom enum value for the image to grow and shrink with your mouse wheel as the picture box is resized.

Upvotes: 1

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