In this lesson, I will show you how to smoothen lines and drawings. First, draw a line with the pencil tool or brush tool. The outline of the drawing doesn't look smooth, does it?
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Figure 4.1
To smoothen the drawing/line, right click the drawing and click smooth.
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Figure 4.2
After that, it should look like this:

Figure 4.3
Compare the drawing that is smoothened with the previous drawing, does it look smoother?
To straighten a drawing, just click straighten after right-clicking the drawing. After that, it should look like this:

Figure 4.4
Now, you can use this method to improve the quality of the drawings you draw in flash, though it is also good if you use other programs to draw pictures.