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All of the Paint tools, Clone and Blur and Erase, they are all really based on strokes. So let's take a look at what a stroke is. First of all, I'm going to select the Brush tool and just draw a stroke across the screen, and it shows up here in our list. When I finish the stroke, it stays in Brush tool, so I can immediately draw a couple of more if I want. Whichever stroke is currently selected, will be hooked up to the Common, Transform and Stroke tabs.
You can now adjust the parameters after the fact. So we could for example, change that Opacity, put that back, or change the blending mode. On the Transform Page, we can do a transformation, or on the Stroke Page, we could edit something like the Brush Size or the Brush Hardness, anything we want. Put that back to the Common tab. While the default lifetime of a shape is the full length of the clip, the default lifetime of a stroke is always one frame, the current frame, and you can see right here, these strokes are all created on Frame 1.
Now, let's take a look at how to edit the stroke points. First of all, we have to select our Selection tool. But you'll notice that we can't select any points. We don't have any points on our stroke. In order for you to see the points of a stroke, you have to turn on Allow Paint Selection here. Now we can edit the points of that stroke. We can also move the entire stroke around with the transform jack and we can select points using the transformation box, move them all as a group, or select points, hit the Delete key to erase them.
And I can insert points from the keyboard-- First, I'm going to have to select the stroke. By using the universal insert command, Alt+Command+Left Mouse Button, click, click, click. Now let's take a look at how we might animate a stroke. I'm going to delete these other two strokes here, get them out of our face, select them in the list, and hit the Delete key, and select Stroke1. If we're going to animate a stroke, the first thing we have to do is give it a life span of longer than one frame. Right? Okay. So let's do that.
Let's roll the playhead out here to Frame 20. And with Stroke1 selected, on the Common tab, we'll come to the Lifetime Type and we'll set it for here, for beginning to current frame, from the start frame to Frame 20. And now, as I scrub the playhead, we can see the stroke has a lifetime up to 20 and then it's gone. With the lifetime of the stroke set, I can now, for example, edit the control points. So let's select a bunch of control points, give it a real obvious change, and now we can see how the control points are animated over the lifetime of the stroke, right.
Next, let's take a look at animating the transform. Again, I'm on frame 20. I'll make sure, my stroke is selected, go to the Transform tab and let's say that I'm going to animate the Rotate on it. All right, now we have points and transforms animated. While we can select the Stroke tab and animate any of the properties that are here. We'll go back to the Common tab. I'll put the playhead back to Frame 1. I'm going to select the Brush tool again.
And remember that we said that the properties that are set up here will be used when it's drawn. So let's go here and change our color, close that, and we'll tap up the size, and let's change the hardness, okay. Now when we draw, we're going to get a brush that has that color, that size and that hardness. And of course, we can go edit that with any of the three tabs that we can use to edit the stroke.
And of course, we can swap the order layer and now Stroke1, the white stroke, is on top of Stroke2. After a stroke is drawn, its control points can be edited as well. We'll see how in the next movie.
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