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iBooks Author has some basic drawing tools that allow us to create shapes and add them to our documents. Now, shapes can take one of two forms. They can either be open shapes or closed shapes. Open shapes are simply lines. They can be straight or curved, simple or complex, but all open shapes have two ends of their lines. These endpoints can be simple ends or they can be decorated with items like arrows, boxes, or circles. The line portion of a shape is called the Stroke.
Now, you can control the stroke of a shape over here in the Graphics Inspector. By selecting a line, you can control the style of the line, the color of the line, the thickness, and both of the Endpoints, both the left-hand endpoint and the right-hand endpoint. Closed Shapes on the other hand are simply lines that have no beginning and no end and thus form a completely Closed shape, such as a rectangle, a circle, a star, or a more complex shape.
With a Closed shape, the Stroke is the line that forms the outside edge of the shape. You can set all of the same Stroke options for the line of a Closed shape as you can for an open shape, with the exception of the endpoints. Since this is a continuous line, there are no endpoints, and so iBooks Author doesn't even show us the option to be able to select these. Closed shapes do have an active fill property, however. The fill includes all of the area inside of the line.
You can set a shape's fill to None to create a hollow shape or fill the area with a solid color, a gradient, you can even fill it with an image or apply a tint to an image, to give you a lot of creative options. Now, open shapes do have a fill property, but if you select the fill for most open shapes, there is no area to be filled, so it simply doesn't get applied. But on some more complex shapes, such as a curve, if you apply a fill, you'll see the areas that are under the curve get the fill applied.
Now, how do you figure out what the areas under the curve are? If you can imagine a line that would stretch from one endpoint of a line to the other, the areas that are underneath the curve are the areas that get filled.
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