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I uploaded a fixed version of the tool (it is dynamically loaded at run time).
Please check this dedicated topic.

Hello,
I assume you are referring to the "Angle to Horizontal" tool. I reproduce a problem where moving the central point causes the drawing to disappear (reference line collapse to a single point). Is it the problem you are experiencing as well ?
Strangely enough the Angle to Vertical tool is not affected. I'll see where the problem is.

What version of Kinovea are you using? In recent versions you should be able to tap and drag the picture around and double tap to cycle between fitting the screen and 1x zoom.

Does the picture fill the capture screen but is so large that you cannot see the sides? Or is it that the picture is displayed inside a small rectangle within the capture screen?

On the desktop CTRL+Mouse wheel is bound to zooming. I don't know if the pinch gesture is emulating this or sending its own commands.

I cannot test for touch screens at the moment, I'll see if I can find an emulator somehow.

As an experiment you can also test the camera simulator (just added in 0.8.22). From the Camera tab, click on "Manual connection" button. In the "Type of camera" combo, choose "Camera simulator" and click "Create camera". Create two of them and go into dual camera mode.

From their configuration you can set them to HD 720 @ 30fps for example, and see if the framerate stays stable, with and without recording.

Distortion correction in action in a less rigorous setting.

Fig 1. Plane mapping on a video from a different camera and at different resolution than the camera used to compute the distortion coefficients.

Here for example I have downloaded a squash video off YouTube in a crappy resolution (426×240). The only thing I know about the video is that it was filmed with a GoPro at the "Wide" setting (170°).

I imported distortion coefficients from my own camera and added a grid tool (in green) simply placing its four corners at field marks. Even though the cameras used are not the same, the grid tool can still be used if the required accuracy is not down to the centimeter. For example coordinates of points on the grid could be used to create a heat map of foot positions (and see how "hot" is the T for a particular play).

For better accuracy the calibration should be done on the same camera. The assembly process introduces small differences from one camera to another.

Unfortunately I never had the chance to play with an HDV camera, so I never tested this first hand. I read here and there that grabbing the HDV stream in DirectShow is more involved than for DV, so I'm not convinced it ever worked.
If anyone has a working setup streaming HDV through Firewire in Kinovea please report.

I am making a rather large detour through projective geometry, homogenous coordinates and line clipping algorithms to fix the rendering of the coordinate system related to the plane calibration. Since the plane and the origin are user-defined, there is plenty of room for awkward cases and unusual sizes or orientations.

Fig 1. 0.8.22, with an example of a completely broken rendering of the coordinate system: Visible vanishing point, lines behind the camera projected above the horizon, limited extension of the grid on the plane yielding mostly empty space.

Fig 2. 0.8.23, better rendering of the same coordinate system. (No 3D framework involved, pure projective geometry).