How do I draw lines using XNA?

Question

I\'ve read a bunch of tutorials involving XNA (and it\'s various versions) and I still am a little confused on drawing primitives. Everything seems to be really convoluted.

Answer 1

found a tutorial for that http://www.bit-101.com/blog/?p=2832

its using a BasicEffect (shader) and the built in draw user primitive in XNA 4.0

some code samples i find helpful:

load content method

basicEffect = new BasicEffect(GraphicsDevice);
basicEffect.VertexColorEnabled = true;
basicEffect.Projection = Matrix.CreateOrthographicOffCenter
(0, GraphicsDevice.Viewport.Width,     // left, right
GraphicsDevice.Viewport.Height, 0,    // bottom, top
0, 1);   

draw method

basicEffect.CurrentTechnique.Passes[0].Apply();
var vertices = new VertexPositionColor[4];
vertices[0].Position = new Vector3(100, 100, 0);
vertices[0].Color = Color.Black;
vertices[1].Position = new Vector3(200, 100, 0);
vertices[1].Color = Color.Red;
vertices[2].Position = new Vector3(200, 200, 0);
vertices[2].Color = Color.Black;
vertices[3].Position = new Vector3(100, 200, 0);
vertices[3].Color = Color.Red;

GraphicsDevice.DrawUserPrimitives(PrimitiveType.LineList, vertices, 0, 2);

have fun and vote up if this helped you. also pay a visit to the tutorial i got this from.