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A clustering example for levels 0 and 1
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Let's say we start with the following character sequence and cluster
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values:
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A,B,C,D,E
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0,1,2,3,4
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We then map the characters to glyphs. For simplicity, let's assume
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that each character maps to the corresponding, identical-looking
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glyph:
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A,B,C,D,E
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0,1,2,3,4
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Now if, for example, B and C
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ligate, then the clusters to which they belong "merge".
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This merged cluster takes for its cluster number the minimum of all
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the cluster numbers of the clusters that went in. In this case, we
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get:
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A,BC,D,E
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0,1 ,3,4
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Now let's assume that the BC glyph decomposes
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into three components, and D also decomposes into
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two. The components each inherit the cluster value of their parent:
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A,BC0,BC1,BC2,D0,D1,E
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0,1 ,1 ,1 ,3 ,3 ,4
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Now if BC2 and D0 ligate, then
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their clusters (numbers 1 and 3) merge into
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min(1,3) = 1:
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A,BC0,BC1,BC2D0,D1,E
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0,1 ,1 ,1 ,1 ,4
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At this point, cluster 1 means: the character sequence
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BCD is represented by glyphs
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BC0,BC1,BC2D0,D1 and cannot be broken down any
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further.
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