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30 lines
1.2 KiB
Racket
30 lines
1.2 KiB
Racket
#lang fontkit/racket
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(provide (all-defined-out))
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;; Represents positioning information for a glyph in a GlyphRun.
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(define-subclass object% (GlyphPosition
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;; The amount to move the virtual pen in the X direction after rendering this glyph.
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[xAdvance 0]
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;; The amount to move the virtual pen in the Y direction after rendering this glyph.
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[yAdvance 0]
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;; The offset from the pen position in the X direction at which to render this glyph.
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[xOffset 0]
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;; The offset from the pen position in the Y direction at which to render this glyph.
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[yOffset 0]
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[advanceWidth 0])
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(as-methods
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scale)
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)
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(define/contract (scale this factor)
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(number? . ->m . (is-a?/c GlyphPosition))
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(set-field! xAdvance this (* factor (· this xAdvance)))
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(set-field! yAdvance this (* factor (· this yAdvance)))
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(set-field! xOffset this (* factor (· this xOffset)))
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(set-field! yOffset this (* factor (· this yOffset)))
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(set-field! advanceWidth this (* factor (· this advanceWidth)))
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this)
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