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C H A P T E R 1 3
Drawing and Graphics
Using the Drawing Interface
13-11
For example, you might nest arrays to create the hierarchy of shapes and styles
depicted in Figure 13-9.
Figure 13-9
Example of nested shape arrays
If the nested shape array depicted in Figure 13-9 were passed to the
DrawShape
function, the results summarized in Table 13-1 would occur.
The Transform Slot in Nested Shape Arrays
13
Within a single shape array, the
transform
slot is treated like a style frame: only
one transform is active per array; if another transform is specified within the array,
the previous transform is overridden. Within nested arrays, however, the
transform
slot is treated a little differently than most style slots. As the
DrawShape
method
descends into nested arrays of shapes, changes to the
transform
slot are
cumulative; the resulting transform is the net sum of all the transforms in the
hierarchy. For example, if in Figure 13-9 startStyle has a transform of 10,10 and
Style 3 has a transform 50,0 then shapes 2a, 2b, 1, 3a would be drawn offset by
10,10 but Shape 3b would be drawn offset by 60,10.
Table 13-1
Summary of drawing results
Shape
Style
2a
2
2b
2
3a
startStyle
3b
3
1
startStyle
Style 2
Shape 3a
Shape 2a
Style 3
Shape 2b
Shape 3b
Start Style
Shape 1
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