Short, frequent posts on what is new in Debrief v4, written in the same pull request as the work they describe.
A track can now be moved and rotated on the map: the whole track, or only its fixes in the time window. Drag a handle and the track follows, with the range and bearing (or the angle) shown as you go; let go and it's one step in the plot's history. Tracks can also be split at current time and merged again. Everything can be done from the keyboard or a form, and Ctrl+Z takes any of it back.
A track, or its fixes in the time window, can now be sheared: hold one end, drag the other, and every fix in between moves in proportion to its time from the end you held. A straight leg stays a straight leg, with a new course and speed, and the map tells you both as you drag. Stretch does the same with the speed alone. Each release is one step, and the keyboard and two small forms do it too.
Analysts can now add lines, areas, circles, ellipses, labels, markers and notes to a plot through a form, style them, give them a time, change and delete them. Each is one step in the plot's history, so Ctrl+Z takes it back. Notes are listed in a new Timeline, and legacy plots bring their circles, ellipses and styling with them.
Annotations can now be drawn straight onto the map: a line, an area, a circle, an ellipse, a label or a marker, with the range, bearing and size shown as you draw. Select one and handles appear, to drag a corner, move a circle or turn an ellipse. Each finished annotation is one step in the plot's history, and so is each change, so Ctrl+Z takes it back. Everything can also be done from the keyboard.
A plot is now one file an analyst can pass to a colleague, and its whole history goes with it. The colleague can undo a step the sender made, go back to any step, and see who did what, with nothing else beside the file.
Debrief now has a time controller. The analyst sets one time window for the whole plot, plays through it at a chosen speed, and hands the plot file to a colleague, who opens it on the same window.
Debrief v4 starts with foundations rather than features. Here is the shape everything else will hang from.
When you drag the time slider or a target solution, the numbers must keep up with your hand. We measured whether they will.
Debrief v4 measures ranges and bearings along the true shape of the Earth. Legacy Debrief did not, so some figures will change slightly.
Phase 1's job is to prove the architecture by walking one path all the way through. You open a catalogue, see a plot on a map, select tracks, run a Python tool, and see its result on the map. That now works in VS Code.