Horizontal Zooming - Drawing issue

[moelski.net]

TChart Version : 4.1.2014.2242

Hi !

I think there is a problem in the Zooming functions ... Just use the attached sample projekt and run it. Open the Editor and go to the General/Zoom tab.
Set the Direction to Horizontal and press close to end the editor.

Now just zoom within the chart. I got this rectangles on different computers:

Problem on Windows XP 32 Bit

TestOnXP.jpg (56.4 KiB) Viewed 16537 times

This is on windows XP (32 Bit)

Problem on Win7 64 Bit

2014-05-04_19-04-40.png (62.46 KiB) Viewed 16538 times

This is on my developement system with Win7 64Bit.

And I asked one of our users to test it, too. He has the same behaviour on a XP 32Bit system.

Can you confirm this issue and tell me a quick workaround or a new Tchart.dll with a fix?
We want to bring out our new software, soon. But this issue is a real blocking point for us.

Best regards
Dominik

[moelski.net]

Oh I forgot this:

IDE : VS 2012
Language : C#

Dominik

[Christopher]

Hello Dominik,

Oh I forgot this:

IDE : VS 2012
Language : C#

Yes, I've been able to reproduce this issue here and have added it to our bug database with ID=760. As you can read there, there is a temporary workaround to this issue:

Code: Select all

        private void button1_Click(object sender, EventArgs e)
        {
          this.editor1.CloseEditor += editor1_CloseEditor;
          this.editor1.ShowModal();
        }

        void editor1_CloseEditor(object sender, EventArgs e)
        {
          tChart1.Zoom.Pen.Visible = false;
        }

You will also be able to see that this issue is now fixed and will be available in the next maintenance release, due out within the next two working days.

[moelski.net]

Hi Christopher,

ok I think I can wait for the next release.

Thx for your help !

Dominik

[Christopher]

Hello Dominik,

ok I think I can wait for the next release.

Thx for your help !

That's good.

You're very welcome

[moelski.net]

Hi Christopher,

I think there is another issue on this zoom topic. I use this code to detect STRG and SHIFT key to set vertical or horizontal zooming:

Code: Select all

        private void tChart1_MouseDown(object sender, MouseEventArgs e)
        {
            var strgPressed = ModifierKeys == Keys.Control;
            var shiftPressed = ModifierKeys == Keys.Shift;
            var bothPressed = ModifierKeys == (Keys.Shift | Keys.Control);

            if (e.Button == MouseButtons.Left)
            {
                if (!strgPressed & !shiftPressed) { this.tChart1.Zoom.Direction = ZoomDirections.Both; }
                if (strgPressed) { this.tChart1.Zoom.Direction = ZoomDirections.Horizontal; }
                if (shiftPressed) { this.tChart1.Zoom.Direction = ZoomDirections.Vertical; }
            }
        }

But if I run this code the zoom rectangle is not drawn at the correct position:

Horizontal Error

Horizontal Error.png (52.97 KiB) Viewed 16515 times

Vertical Error

Vertical Error.png (48.5 KiB) Viewed 16508 times

I have placed some red marks. That would be what I would expect from the rectangle to be drawn.

You can test this with my sample application above.

Hope this can be fixed, too.

[moelski.net]

Oh and one additional thing if missing (which is important for zooming, too). The MouseWheel event is not visible in the IDE:

MouseWheel.png (5.27 KiB) Viewed 16530 times

But I think this is not a big deal ...

[Christopher]

Hello,

Hope this can be fixed, too.

Not so much fixed, but a technique that can be deployed:

Code: Select all

    private void tChart1_MouseDown(object sender, MouseEventArgs e)
    {
      var strgPressed = ModifierKeys == Keys.Control;
      var shiftPressed = ModifierKeys == Keys.Shift;
      var bothPressed = ModifierKeys == (Keys.Shift | Keys.Control);

      int x = e.X;
      int y = e.Y;

      Rectangle rect = tChart1.Chart.ChartRect;

      if (e.Button == MouseButtons.Left)
      {
        if (!strgPressed & !shiftPressed)
        {
          this.tChart1.Zoom.Direction = ZoomDirections.Both;
        }
        if (strgPressed)
        {
          this.tChart1.Zoom.Direction = ZoomDirections.Horizontal;
          y = rect.Top;
          tChart1.Zoom.Activate(x, y);
        }
        if (shiftPressed)
        {
          this.tChart1.Zoom.Direction = ZoomDirections.Vertical;
          x = rect.Left;
          tChart1.Zoom.Activate(x, y);
        }
      }
    }

This is happening because the TeeChart code in the OnMouseDown event is being called before your code in this tChart1_MouseDown event. This is inevitable. To correct for this we can copy a little of the necessary functionality, which includes the call to Zoom.Activate.

[Christopher]

Hello,

But I think this is not a big deal ...

This is strange, but as you can see from the documentation for the System.Windows.Forms.Control MouseWheel event, the BrowsableAttribute is set to false. I'm not sure why.

[moelski.net]

Hi !

the BrowsableAttribute is set to false

Can´t you change it so that it is visible for tchart?

will be available in the next maintenance release, due out within the next two working days

Hope to see a new version today

[Christopher]

Can´t you change it so that it is visible for tchart?

No, I cannot.

Hope to see a new version today

That will depend on how many questions I am asked today