If Greenshot had a Polyline/Polygon markup option, it was make it easy for me to switch completely to Greenshot.

If you need a good example of a combined Polyline/Polygon tool, look at Microsoft Word (I'm using 2010): Insert -> Shapes -> Freeform (listed under "Lines" heading). Similar to the Line tool, you simply select the tool, then click on the image where you want to start the line. Then, where you click the next point, it draws the line between them, but the Polyline would allow you to keep drawing more segments of the line with each click. When complete, you just double-click and the drawing stops drawing at the spot you double-click. A polyline should have the same formatting options as the Line (line color, width, etc). If you are drawing a polyline, and end up clicking on the same spot you started (single click), it will complete the drawing as a "closed" Polygon shape. A polygon would still have the formatting options of line color/line width for the outline, but would also have the "fill" option like a circle or rectangular shape, as well as transparency (for highlighting). You can also edit the Polyline/Polygon after drawing it by highlighting the shape, going to the Format tab -> Edit Shape -> Edit Points. This allows you to see the points and drag them around. You hold CTRL and click a point to delete it, or hold CTRL and click a spot on the line where there is no point to create one.

You could also look to Adobe Reader (XI) for another example. Open a document in Adobe Reader, click the "Comment" button at the top right, then expand "Drawing Markups". Instead of a combined Polyline/Polygon tool, Adobe Reader separates these into two separate tools, which works just as well. In the Drawing Markups list, you'll see the Circle, Rectangle, Cloud, then Polygon and Polyline tools.

Right now I take screenshots and paste them into Word for drawing on them, only to screenshot the finished product again when complete. Being able to keep everything within the Greenshot editor would be a big help.

Thank you for your efforts!

Robin,regarding your list:

1. Yes I would make a new button, it's independent of a line.

2. yes

3. excatly

4. I would use the "Enter" Key to stop the polyline at the last picked point( most CAD apps like AutoCAD work like that)

this above is the essential implementation, the following is optional:

1. when a Polyline is already selected (corner grips show in black) a individual corner grip can be moved by draging the mouse exactly on it. Draging the Mouse on the linear segment would move the hole polyline.

2. Arrows can be added to the ends like with lines

3. delete removes the hole polyline (removing and adding points would be not essential, for now)

4. polyline can be closed by clicking a point very close to the startpoint

5. A polyline can be converted to a degree 3 spline in the menu (next to where i pick the end style and thickness)

Robin is this description what you expected?

@Gos Thanks, but not really, I know what a polyline is

I need things, for example like:

1. There is a new polyline button under the line button.

2. When pressing this button I can start drawing a polyline.

3. The part of the polyline which I am drawing stops where I click a second time, and a next part starts

4. When I ??? the drawing stops. How do we stop, ESC?

5. Every single endpoint can be moved separately.
   What about arrows?
   What does a delete do, how can I remove parts of the polyline?

Your example would influence all the people who draw normal lines dramatically, they would no need to press enter or double click...

The same goes for a spline, I know what it is... but as a user how do you want to define one?

Drawing a Polyline is similar to drawing a line. It starts the same way but after picking the end point the drawing does not stop. Instead the next point can be drawn and will be connected to the previous endpoint. And so on.. the last point of the poly line can be set by double clicking. Or the points picking loop could be exited by pressing enter.

Robin is this the kind of description you where looking for?

Can someone describe how this should work from a user point of view?
Like, how does one go from a straight line, to a Spline?
What do you expect from a polyline?