Line Strips
A version of this page is also available for
4/8/2010
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 shows a rendered line strip.
.gif "Aa911032.d1bd5f78-bdc3-4708-8d86-c52eb91141b6(en-us,MSDN.10).gif")
The line strip primitive is identified by the D3DMPT_LINESTRIP element of the D3DMPRIMITIVETYPE enumeration.
The following code example 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 following code example shows how to use IDirect3DMobileDevice::DrawPrimitive to render this line strip.
//
// It is assumed that d3dmDevice is a valid
// pointer to a IDirect3DMobileDevice interface.
//
d3dmDevice->DrawPrimitive( D3DMPT_LINESTRIP, 0, 5 );