Function reference
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draw_key_pie() - Legend key for the pie glyphs
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geom_pie_glyph() - Scatter plot with points replaced by axis-invariant pie-chart glyphs
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geom_pie_interactive() - Scatter plots with interactive pie-chart glyphs
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pieGrob() - Create pie-chart glyph
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scale_radius_discrete()scale_radius_manual()scale_radius_continuous()scale_radius() - Scales for the pie glyph radius