Method _drawSegment

core/2d/DrawNode.cpp:1070–1199

}

void DrawNode::_drawSegment(const Vec2& from,
                            const Vec2& to,
                            const Color4F& color,
                            float thickness,
                            DrawNode::EndType etStart,
                            DrawNode::EndType etEnd)
{
    if (thickness < 1.0f)
        thickness = 1.0f;

    if (thickness == 1.0f && !properties.drawOrder)
    {
        _drawLine(from, to, color); // fastest way to draw a line
    }
    else
    {
        Vec2 vertices[2] = {from, to};
        applyTransform(vertices, vertices, 2);

        float width = thickness / (2 * properties.factor);

        Vec2 a  = vertices[0];
        Vec2 b  = vertices[1];
        Vec2 n  = ((b - a).getPerp()).getNormalized();
        Vec2 t  = n.getPerp();
        Vec2 nw = n * width;
        Vec2 tw = t * width;
        Vec2 v0 = b - (nw + tw);
        Vec2 v1 = b + (nw - tw);
        Vec2 v2 = b - nw;
        Vec2 v3 = b + nw;
        Vec2 v4 = a - nw;
        Vec2 v5 = a + nw;
        Vec2 v6 = a - (nw - tw);
        Vec2 v7 = a + (nw + tw);

        unsigned int vertex_count = 3 * ((etStart != DrawNode::EndType::Butt) ? 2 : 0) + 3 * 2 +
                                    3 * ((etEnd != DrawNode::EndType::Butt) ? 2 : 0);
        auto triangles = reinterpret_cast<V2F_C4B_T2F_Triangle*>(expandBufferAndGetPointer(_triangles, vertex_count));
        _trianglesDirty = true;

        int ii = 0;
        switch (etEnd)
        {
        case DrawNode::EndType::Butt:
            break;

        case DrawNode::EndType::Square:
            triangles[ii++] = {
                {v0, color, Vec2::ZERO},
                {v1, color, -n},
                {v2, color, n},
            };

            triangles[ii++] = {
                {v3, color, n},
                {v1, color, Vec2::ZERO},
                {v2, color, -n},