Pixel grid replacement on common grid with grid autoscale and minor and major lines

[k-samsonov]

    protected virtual void DrawPixelGrid2(Graphics g)
    {
      float gridSize;


      Rectangle imageViewport = this.GetImageViewPort();
      int smallGridFillFactor = 1;


      if ((float)this.ZoomFactor <= 0.5f)
        smallGridFillFactor = 100;
      else if ((float)this.ZoomFactor <= 5)
        smallGridFillFactor = 10;
      else if ((float)this.ZoomFactor > 5)
        smallGridFillFactor = 1;

      float smallGridCell = (float)this.ZoomFactor * smallGridFillFactor;

      int largeGridFillFactor = smallGridFillFactor * 10;
      float largeGridCell = (float)this.ZoomFactor * largeGridFillFactor;


      float smallGridoffsetX = Math.Abs(this.AutoScrollPosition.X) % smallGridCell;
      float smallGridoffsetY = Math.Abs(this.AutoScrollPosition.Y) % smallGridCell;

      float largeGridoffsetX = Math.Abs(this.AutoScrollPosition.X) % largeGridCell;
      float largeGridoffsetY = Math.Abs(this.AutoScrollPosition.Y) % largeGridCell;
      Debug.WriteLine(string.Format("Small GridCell: {0}", smallGridCell));
      Debug.WriteLine(string.Format("Large GridCell: {0}", largeGridCell));

      Pen majorPen = GetMajorPen();
      Pen minorPen = GetMinorPen();


      for (float x = imageViewport.Left - smallGridoffsetX; x < imageViewport.Right; x += smallGridCell)
      {
        g.DrawLine(minorPen, x, imageViewport.Top, x, imageViewport.Bottom);
      }
      for (float y = imageViewport.Top - smallGridoffsetY; y < imageViewport.Bottom; y += smallGridCell)
      {
        g.DrawLine(minorPen, imageViewport.Left, y, imageViewport.Right, y);
      }


      for (float x = imageViewport.Left - largeGridoffsetX; x < imageViewport.Right; x += largeGridCell)
      {
        g.DrawLine(majorPen, x, imageViewport.Top, x, imageViewport.Bottom);
      }
      for (float y = imageViewport.Top - largeGridoffsetY; y < imageViewport.Bottom; y += largeGridCell)
      {
        g.DrawLine(majorPen, imageViewport.Left, y, imageViewport.Right, y);
      }

      g.DrawRectangle(minorPen, imageViewport);


      majorPen.Dispose();
      minorPen.Dispose();
      return;
    }

[cyotek]

Hello,

This is actually something I've considered adding in the past as it's something I wanted for a project but never had the time to implement it. Thanks for the suggestion, and the sample code - I like how your "major" lines are present even when zoomed out.

Many thanks for the suggestion!

Regards;
Richard Moss