When you want something in a layer to change, you need to
use a keyframe. Let’s add a keyframe to the circle layer at frame 20. Select frame
20 then press the F6 key.
THIS IS IMPORTANT: When you add a keyframe, Flash automatically creates
a keyframe that is an exact duplicate of the preceding keyframe.
In our example, when we insert a keyframe at frame 20 of the "circle"
layer, the size, color and location of the circle at keyframe 20 is
identical to the size, color and location of the circle on the first
keyframe (the keyframe that precedes frame 20).
Let’s add another keyframe at frame 15 of the circle layer.
After adding the keyframe, your timeline should look as follows:
Now lock the rectangle layer by clicking in the “lock”
column to the right of the layer name. This will make it easier to select
the circle on the stage, without selecting the rectangle.
Make sure your playhead is at frame 15 (the red line). Using the
selection tool (the black arrow) drag a selection around the circle.
With the
entire circle selected, press the "Delete" key. Look at
your timeline - you will see that the filled-in black keyframe at frame
15 is now a blank keyframe, but the first keyframe and the keyframe
on frame 20 are intact. Play your movie.
Select the blank keyframe at frame 15 of the circle layer. On the
toolbar, change the fill color, select the brush tool and paint a random
“squiggle” on the stage. Notice how the keyframe is now
filled.
Drag the playhead through your movie (drag the red box on top of the
red line). You will see that when you deleted the circle, it was only
deleted from the time of the keyframe until the next keyframe. When
you added the “squiggle” it was only added to that same
segment of time. At frame 20 the circle appears just as it did on the
first keyframe.
THIS IS AN IMPORTANT IDEA TO REMEMBER: When you are editing content
on a keyframe, you are only editing the content that exists between
the current keyframe and the frame before the next keyframe.
