Line Strips

A line strip is a primitive that is composed of connected line segments. Your application can use line strips for creating polygons that are not closed. A closed polygon is a polygon whose last vertex is connected to its first vertex by a line segment. If your application makes polygons based on line strips, the vertices are not guaranteed to be coplanar.

The following illustration depicts a rendered line strip.

The following code shows how to create vertices for this line strip.

struct CUSTOMVERTEX
{
    float x,y,z;
};

CUSTOMVERTEX Vertices[] = 
{
    {-5.0, -5.0, 0.0},
    { 0.0,  5.0, 0.0},
    { 5.0, -5.0, 0.0},
    {10.0,  5.0, 0.0},
    {15.0, -5.0, 0.0},
    {20.0,  5.0, 0.0}
};

The code example below shows how to use IDirect3DDevice9::DrawPrimitive to render this line strip.

//
// It is assumed that d3dDevice is a valid
// pointer to a IDirect3DDevice9 interface.
//
d3dDevice->DrawPrimitive( D3DPT_LINESTRIP, 0, 5 );