plot multiple lines according to size, shape, and alpha

src/geom/line.jl

@@ -111,12 +111,16 @@ function Gadfly.Geom.render(geom::LineGeometry, theme::Gadfly.Theme, aes::Gadfly
     default_aes.group = IndirectArray([1])
     default_aes.color = [theme.default_color]
     default_aes.linestyle = theme.line_style[1:1]
+    default_aes.size = Measure[theme.point_size]
+    default_aes.shape = Function[theme.point_shapes[1]]
+    default_aes.alpha = [theme.alphas[1]]
     aes = inherit(aes, default_aes)
 
     # Render lines, using multivariate groupings:
     XT, YT = eltype(aes.x), eltype(aes.y)
-    GT, CT, LST = Int, eltype(aes.color), eltype(aes.linestyle)
-    groups = collect(Tuple{GT, CT, LST}, Compose.cyclezip(aes.group, aes.color, aes.linestyle))
+    GT, CT, LST, SzT, ShT, AT = Int, eltype(aes.color), eltype(aes.linestyle), eltype(aes.size), eltype(aes.shape), eltype(aes.alpha)
+    groups = collect(Tuple{GT, CT, LST, SzT, ShT, AT},
+                     Compose.cyclezip(aes.group, aes.color, aes.linestyle, aes.size, aes.shape, aes.alpha))
     ugroups = unique(groups)
     nugroups = length(ugroups)
     # Recycle groups

test/testscripts/twolines_size_shape_alpha.jl

@@ -0,0 +1,12 @@
+using Gadfly
+
+set_default_plot_size(12inch, 3inch)
+
+p_size = plot(x=[1,2,3,1,2,3], y=[1,2,3,4,5,6], size=[1,1,1,2,2,2],
+              Geom.line, Geom.point, Scale.size_discrete2(n->range(3pt, 8pt, length=n)))
+p_shape = plot(x=[1,2,3,1,2,3], y=[1,2,3,4,5,6], shape=[1,1,1,2,2,2],
+               Geom.line, Geom.point)
+p_alpha = plot(x=[1,2,3,1,2,3], y=[1,2,3,4,5,6], alpha=[1,1,1,0.5,0.5,0.5],
+               Geom.line, Geom.point)
+
+hstack(p_size, p_shape, p_alpha)