Usage of gchart:
-area
area chart
-areaop float
area opacity (default 50)
-bar
bar chart
-barwidth float
bar width (default 0.5)
-bgcolor string
background color (default "white")
-bottom float
bar width (default 40)
-chartitle string
chart title
-color string
color (default "steelblue")
-dotsize float
bar width (default 0.5)
-frame float
frame opacity
-grid
show y axis grid
-h int
canvas height (default 1000)
-hbar
horizontal bar
-labelcolor string
label color (default "rgb(100,100,100)")
-left float
bar width (default 10)
-line
line chart
-linewidth float
bar width (default 0.25)
-ls float
bar width (default 2)
-pie
show a pie chart
-piesize float
pie chart radius (default 2)
-right float
bar width (default 90)
-scatter
scatter chart
-textsize float
bar width (default 1.5)
-title
show the title (default true)
-top float
bar width (default 80)
-ty float
title position relative to the top (default 5)
-w int
canvas width (default 1000)
-xlabel int
x-xaxis label (default 1)
-yfmt string
yaxis format (default "%v")
-yrange string
y axis range (min,max,step
-zero
zero minumum (default true)