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basic support for arrow in GR

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This commit is contained in:
Thomas Breloff 2016-11-02 13:22:50 -04:00
parent dfb89ef7f5
commit bf0f44773f
1 changed files with 6 additions and 2 deletions
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8
src/backends/gr.jl
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@ -30,6 +30,7 @@ const _gr_attr = merge_with_base_supported([
:normalize, :weights,
:inset_subplots,
:bar_width,
:arrow,
])
const _gr_seriestype = [
:path, :scatter,
@ -131,7 +132,7 @@ gr_set_textcolor(c) = GR.settextcolorind(gr_getcolorind(cycle(c,1)))
# draw line segments, splitting x/y into contiguous/finite segments
# note: this can be used for shapes by passing func `GR.fillarea`
function gr_polyline(x, y, func = GR.polyline)
function gr_polyline(x, y, func = GR.polyline; arrow=false)
iend = 0
n = length(x)
while iend < n-1
@ -159,6 +160,9 @@ function gr_polyline(x, y, func = GR.polyline)
# if we found a start and end, draw the line segment, otherwise we're done
if istart > 0 && iend > 0
func(x[istart:iend], y[istart:iend])
if arrow
GR.drawarrow(x[iend-1], y[iend-1], x[iend], y[iend])
end
else
break
end
@ -764,7 +768,7 @@ function gr_display(sp::Subplot{GRBackend}, w, h, viewport_canvas)
# draw the line(s)
if st == :path
gr_set_line(series[:linewidth], series[:linestyle], series[:linecolor]) #, series[:linealpha])
gr_polyline(x, y)
gr_polyline(x, y; arrow = isa(series[:arrow], Arrow))
end
end