Is it possible to draw a line on a clip?

Question

This relates to
OS X
Premier & Photoshop Elements 9
I want to create a line, with arrowhead, to point out something in a clip. My preference is to have the line appear as though it were being drawn, hence it might be a wipe.
I can see at least one method of simply adding a line. Take a frame and add the line in Photoshop E, then insert the frame back into the clip sequence.
However, I can't see if there is a way to make the line dynamic as described above. As an example think of the way sports commentators draw over a play to indicate the tactics that are being executed.
My question: Is there a way to accomplish a "dynamically appearing line" using Pre and PE?
Thanks

Answer 1

Now for the rest of your questions.
Yes, that "revealing" was what I was talking about, and Keyframing the Crop Effect should allow you to reveal over time, as you want.
As for the circle, there is a bit more involved, as the Crop, or Linear Wipe Transition will work in a linear fashion, unlike how a circle would be actually drawn. Same as with cursive Text, in a "handwriting" font. To do those, I first go into Photoshop, and create say my circle, as I want it to appear in the final. This will be my last Frame of the animation. Then, I create a Layer Mask to cover up the circle. This will be my first Frame. With say the Eraser Tool, set to a soft-edged Brush, I will Frame-by-Frame Erase parts of the Layer Mask, doing a Save_As PSD, for each step. This will yield every intermediate Frame in the process, and when Imported, and placed on the Timeline, will appear as the circle (or handwriting font), being drawn by hand. Before Import, adjust your Still Duration (in Edit>Preferences) to about 3 - 5 Frames, and then place a Cross-Dissolve between each Frame. I also temporarily set my Transition Duration to be very short. The exact Duration of the stills (the PSD's), and the Duration of the Transitions might require some tweaking, until you are satisfied with the smoothness.
I had to animate about 10 lines of cursive handwriting Text for a DVD Menu, and even with PS and my Layer Mask, it took several hours, then a bit more to find the right Duration and Transition Duration, but the effect was worth the effort. I then added an SFX of chalk striking a chalkboard (for the start of each letter/word), and an SFX of chalk writing on a chalkboard to complete the effect. A circle would be much easier.
Good luck, and hope that this helps.
Hunt
PS - I also used a bit of "distress" for the handwriting, so that it was not 100% on the edges, but that was an easy effect, as it only had to be applied to the complete Frame, and thus was visible as each part of each letter/word was "revealed" by the Layer Mask. I forget if PSE has Layer Mask, or not.