bug in 2d lines

[CarloLucibello]

I'm trying to plot a graph using GLVisualize, and I was trying to display an edge as a line, that is something like

w, r = glscreen()
@async r()

s = Vec2f0(50)
N = nv(g)
v_pos = Point2f0[Point2f0((N*s[1]*rand(2))...) for i=1:N]
v = visualize(v_pos[1:2], :lines, scale=s)
view(v, method=:orthographic_pixel)

but all I get is a blank window. I'm on next2 branch

The same goes for v = visualize(v_pos[1:3], :lines, scale=s) while for 4 or more the piecewise line is displayed correctly.

PS
I tried to view a LineSegment from GeometryTypes but it didn't worked out

PPS
I've in mind to write something like

function plot(g::SimpleGraph)
    srand(17)
    w, r = glscreen()
    @async r()

    s = Vec2f0(50)
    N = nv(g)
    v_pos = Point2f0[Point2f0((N*s[1]*rand(2))...) for i=1:N]
    v_img = HyperSphere(Point2f0(0), 30f0)
    vis_nodes = visualize((v_img, v_pos), :lines, scale=s)
    view(vis_nodes, method=:orthographic_pixel)

    for e in edges(g)
        epos = [v_pos[src(e)], v_pos[dst(e)]]
        v = visualize(epos, :lines, scale=s)
        view(v, method=:orthographic_pixel)
    end
end

Since I'm new to GLVisualize (and to graphics in general) probably I"m doing it wrong, any suggestion is appreciated

[SimonDanisch]

Is N very big? Because then the points would be outside the window area...

[CarloLucibello]

It is small, N=10

Defining this function

function plot(m)
    srand(17)
    w, r = glscreen()
    @async r()
    s = Vec2f0(50)
    N = 10
    v_pos = Point2f0[Point2f0((N*s[1]*rand(2))...) for i=1:N]
    v_img = HyperSphere(Point2f0(0), 30f0)
    vis_nodes = visualize((v_img, v_pos), :lines, scale=s)
    view(vis_nodes, method=:orthographic_pixel)

    # m used here
    v = visualize(v_pos[1:m], :lines, scale=s)

    view(v, method=:orthographic_pixel)
end

I obtain

plot(5)

plot(4)

plot(3)

[SimonDanisch]

I guess your problem is that the primitives are not centered?
I should have fixed this in a newer commit, if you dare to checkout.
Also, when given a primitive with dimensions, you don't need to supply the scale!
In the newer commit, you can define the centering yourself. With the circle, it's centered at the middle point.

[CarloLucibello]

Oh yes, that was a problem, but the real problem is that with plot(3) I was expecting to see two segments

[SimonDanisch]

Ah yeah... That's actually what I wanted to work on today. That's a peculiarity of OpenGL and I want to make a proper work around and fix another issue while at it (being able to add a list of indexes and specifying which points are connected). The only work around you can use right away is, to never have less than 4 points...
There is this annoying temporary fix:

a,b = points 
ab = b-a
points = vcat(a-(ab*0.00001f0),a,b,b+(ab*0.00001f0)) #start and end have to be slightly different

[CarloLucibello]

ok thanks.

As an alternative, there is a way to visualize types from GeometryTypes.jl, like LineSegment?

[CarloLucibello]

(being able to add a list of indexes and specifying which points are connected).

that's exactly what I need to visualize a graph

[SimonDanisch]

Well, that's basically what I will be implementing.

[SimonDanisch]

Great! I can't promise anything, but I'm working on it ;)

[SimonDanisch]

Okay I fixed the line endings and made a step forward towards the segments ;) I just need to integrate a few changes into the rest of the infrastructure to make it work for the generic case.

[CarloLucibello]

nice!

still some sprites' offset after last patches

[SimonDanisch]

uh...have you removed scale=s ?

[CarloLucibello]

ouch, right, sorry, it works perfectly!

[musm]

@SimonDanisch
Any idea why I keep getting this?
julia julia> Pkg.checkout("GeometryTypes", "sd/typealias") INFO: Checking out GeometryTypes sd/typealias... WARNING: Cannot perform fast-forward merge. INFO: Pulling GeometryTypes latest sd/typealias... WARNING: Cannot perform fast-forward merge. INFO: No packages to install, update or remove

[SimonDanisch]

that's a julia/github issue. Sometimes it helped to first do Pkg.checkout("GeometryTypes", "master").
You can also try doing it manually. Just go into the GeometryTypes folder with your terminal and type:

git checkout sd/typealias

You might need to throw in a:

git reset --hard HEAD

If there have been changes in the sources.