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[Snippets/statShape] Draw slant line

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This commit is contained in:
Behdad Esfahbod 2022-08-24 16:32:09 -06:00
parent baecd8850b
commit 1500e35b1c
1 changed files with 18 additions and 2 deletions
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20
Snippets/statShape.py
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@ -36,8 +36,6 @@ with cairo.SVGSurface("example.svg", hhea.advanceWidthMax, hhea.ascent-hhea.desc
stats = StatisticsPen()
glyph.draw(stats)
context.save()
# https://cookierobotics.com/007/
a = stats.varianceX
b = stats.covariance
@ -59,6 +57,7 @@ with cairo.SVGSurface("example.svg", hhea.advanceWidthMax, hhea.ascent-hhea.desc
ellipse_area = math.sqrt(lambda1) * math.sqrt(lambda2) * math.pi/4 * mult * mult
context.save()
context.set_line_cap(cairo.LINE_CAP_ROUND)
context.transform(transform)
context.move_to(0, 0)
@ -66,5 +65,22 @@ with cairo.SVGSurface("example.svg", hhea.advanceWidthMax, hhea.ascent-hhea.desc
context.set_line_width(1)
context.set_source_rgba(1, 0, 0, abs(stats.area / ellipse_area))
context.stroke()
context.restore()
context.save()
context.set_line_cap(cairo.LINE_CAP_ROUND)
context.set_source_rgb(.8, 0, 0)
context.translate(stats.meanX, stats.meanY)
context.move_to(0, 0)
context.line_to(0, 0)
context.set_line_width(15)
context.stroke()
context.transform(cairo.Matrix(1, 0, stats.slant, 1, 0, 0))
context.move_to(0, -stats.meanY + font['hhea'].ascent)
context.line_to(0, -stats.meanY + font['hhea'].descent)
context.set_line_width(5)
context.stroke()
context.restore()