glowygraph 0.8.0

A library for drawing glowy graphs
Documentation 
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use glium::{self, Surface};
use cgmath;

/// Node is used to pass nodes into the renderer.
#[derive(Copy, Clone, Debug)]
pub struct Node {
    pub position: [f32; 3],
    pub inner_color: [f32; 4],
    /// Decreasing falloff makes the nodes brightness more centered at the middle and increasing it makes it consistent.
    pub falloff: f32,
    pub falloff_color: [f32; 4],
    pub falloff_radius: f32,
    pub inner_radius: f32,
}

impl From<cgmath::Point3<f32>> for Node {
    fn from(point: cgmath::Point3<f32>) -> Node {
        Node {
            position: point.into(),
            inner_color: [1.0, 1.0, 1.0, 1.0],
            falloff: 0.5,
            falloff_color: [1.0, 1.0, 1.0, 1.0],
            // These radii will only work in certian scenarios, but can be modified.
            falloff_radius: 0.01,
            inner_radius: 0.002,
        }
    }
}

implement_vertex!(
    Node,
    position,
    inner_color,
    falloff,
    falloff_color,
    falloff_radius,
    inner_radius
);

/// A Renderer is tied to the lifetime of the glium Display and making one builds a GLSL program internally.
pub struct Renderer<'a, D>
where
    D: 'a,
{
    display: &'a D,
    node_program: glium::Program,
    round_edge_program: glium::Program,
    flat_edge_program: glium::Program,
    params: glium::DrawParameters<'a>,
}

impl<'a, D> Renderer<'a, D>
where
    D: glium::backend::Facade,
{
    /// Make a new Renderer from a Facade.
    pub fn new(display: &'a D) -> Self {
        Renderer {
            display: display,
            node_program: glium::Program::from_source(
                display,
                include_str!("node.vert"),
                include_str!("node.frag"),
                Some(include_str!("node.geom")),
            ).unwrap(),
            round_edge_program: glium::Program::from_source(
                display,
                include_str!("node.vert"),
                include_str!("node.frag"),
                Some(include_str!("round_edge.geom")),
            ).unwrap(),
            flat_edge_program: glium::Program::from_source(
                display,
                include_str!("node.vert"),
                include_str!("node.frag"),
                Some(include_str!("flat_edge.geom")),
            ).unwrap(),
            params: glium::DrawParameters {
                blend: glium::Blend::alpha_blending(),
                ..Default::default()
            },
        }
    }

    /// Take a modelview matrix, projection matrix, and a series of nodes and draw them in parallel on the GPU.
    pub fn render_nodes<S>(
        &self,
        target: &mut S,
        modelview: [[f32; 4]; 4],
        projection: [[f32; 4]; 4],
        nodes: &[Node],
    ) where
        S: Surface,
    {
        let vertex_buffer = glium::VertexBuffer::new(self.display, nodes).unwrap();
        let indices = glium::index::NoIndices(glium::index::PrimitiveType::Points);

        let uniforms = uniform! {
            modelview: modelview,
            projection: projection,
        };
        target
            .draw(
                &vertex_buffer,
                &indices,
                &self.node_program,
                &uniforms,
                &self.params,
            )
            .unwrap();
    }

    /// Take a modelview matrix, projection matrix, and a series of lines (edges) and draw them in parallel on the GPU.
    ///
    /// These have round ends.
    pub fn render_edges_round<S>(
        &self,
        target: &mut S,
        modelview: [[f32; 4]; 4],
        projection: [[f32; 4]; 4],
        edges: &[Node],
    ) where
        S: Surface,
    {
        let vertex_buffer = glium::VertexBuffer::new(self.display, edges).unwrap();
        let indices = glium::index::NoIndices(glium::index::PrimitiveType::LinesList);

        let uniforms = uniform! {
            modelview: modelview,
            projection: projection,
        };
        target
            .draw(
                &vertex_buffer,
                &indices,
                &self.round_edge_program,
                &uniforms,
                &self.params,
            )
            .unwrap();
    }

    /// Take a modelview matrix, projection matrix, and a series of lines (edges) and draw them in parallel on the GPU.
    ///
    /// These have flat ends.
    pub fn render_edges_flat<S>(
        &self,
        target: &mut S,
        modelview: [[f32; 4]; 4],
        projection: [[f32; 4]; 4],
        edges: &[Node],
    ) where
        S: Surface,
    {
        let vertex_buffer = glium::VertexBuffer::new(self.display, edges).unwrap();
        let indices = glium::index::NoIndices(glium::index::PrimitiveType::LinesList);

        let uniforms = uniform! {
            modelview: modelview,
            projection: projection,
        };
        target
            .draw(
                &vertex_buffer,
                &indices,
                &self.flat_edge_program,
                &uniforms,
                &self.params,
            )
            .unwrap();
    }
}