CANVAS:stroke_poly(xytable, color)
Stroke a polygon through the points defined in the xytable with a specific color.
The width of the line is the last value passed to CANVAS:set_line_width or
1 if no width has ever been specified.
Parameters:
xytable A Lua table {{x=x1,y=y1},{x=x2,y=y2}...}. Alternatively two tables of parameters containing an
array of points may be provided as in {x1,x2,..}, {y1,y2,..} similar to the section called “gre.poly_string”
color An RGB color value as an integer value.
-- Stroke a triangle using a polygon
function StrokeRedTrianglePoly(name)
local canvas = gre.get_canvas(name)
local size = canvas:get_dimensions()
local mid = size.width / 2
-- Shrink the bounds to make the lines visible
size.height = size.height - 2
size.width = size.width - 2
local pts = {}
table.insert(pts, {x=2,y=2})
table.insert(pts, {x=mid,y=size.height})
table.insert(pts, {x=size.width,y=2})
table.insert(pts, pts[1]) --Close the polygon
canvas:stroke_poly(pts, 0xff0000)
end