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OneThreeThreeSeven

XNA code not working

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using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

namespace WindowsGame2
{
/// <summary>
/// This is the main type for your game
/// </summary>
public class Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
KeyboardState kb;
VertexPositionColor[] vertices = new VertexPositionColor[4];
BasicEffect effect;

public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
}

/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected override void Initialize()
{
// TODO: Add your initialization logic here

effect = new BasicEffect(graphics.GraphicsDevice);
effect.VertexColorEnabled = true;
effect.Projection = Matrix.CreateOrthographicOffCenter(0, graphics.GraphicsDevice.Viewport.Width, graphics.GraphicsDevice.Viewport.Height, 0, 1, 0);

graphics.PreferredBackBufferWidth = 1024;
graphics.PreferredBackBufferHeight = 768;
Window.Title = "Matrix Math";
graphics.ApplyChanges();


vertices[0] = new VertexPositionColor(new Vector3(-2.0f, 2.0f, -1.5f), Color.CadetBlue);
vertices[1] = new VertexPositionColor(new Vector3(2.0f, 2.0f, -1.5f), Color.Blue);
vertices[2] = new VertexPositionColor(new Vector3(-2.0f, -2.0f, -1.5f), Color.Brown);
vertices[3] = new VertexPositionColor(new Vector3(2.0f, -2.0f, -1.5f), Color.Crimson);
kb = Keyboard.GetState();
base.Initialize();
}

/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);

// TODO: use this.Content to load your game content here
}

/// <summary>
/// UnloadContent will be called once per game and is the place to unload
/// all content.
/// </summary>
protected override void UnloadContent()
{
// TODO: Unload any non ContentManager content here
}

/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{

KeyboardState newstate = Keyboard.GetState();

if (newstate.IsKeyDown(Keys.Escape) && (graphics.IsFullScreen))
{
if (!kb.IsKeyDown(Keys.Escape))
{
graphics.IsFullScreen = false;
graphics.ApplyChanges();
}
}
else if (newstate.IsKeyDown(Keys.Escape) && (!graphics.IsFullScreen))
{
if (!kb.IsKeyDown(Keys.Escape))
{
graphics.IsFullScreen = true;
graphics.ApplyChanges();
}
}

kb = newstate;

// TODO: Add your update logic here

base.Update(gameTime);
}

/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.MediumAquamarine);

effect.CurrentTechnique.Passes[0].Apply();
graphics.GraphicsDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.TriangleStrip, vertices, 0, 2);
// TODO: Add your drawing code here

base.Draw(gameTime);
}
}
}



Trying to draw a square but it's not working.

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Hi OneThreeThreeSeven.

ok i havent used XNA for a couple months now, im installing it right now so
i should be able to give a awnser soon if nobody else has.

ive only got XNA 3.1 and gives issues with this code but
here are possible solutions,

<posible solutions>

ive noticed that you dont set a view matrix on your basic effect,
have you tried

effect.Begin();
and effect.End();

pass.Begin();
and pass.End();

and have you tried changeing the last param of DrawUserPrimitives,

</posible solutions>

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your Draw() needs to be more extensive, you need to tell all the "bones" in your model howto draw. this depends on your Effect



try this for basicEffect
foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
pass.Apply();

graphics.GraphicsDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.TriangleStrip, vertices, 0, 2);
}

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Dono if this will help but this is the code i used to draw models with,

public void RenderHLSLEffect(Matrix View, Matrix Projection, Model model, Effect effect)
{
effect.Begin(SaveStateMode.SaveState);

for (int p = 0; p < effect.CurrentTechnique.Passes.Count; p++)
effect.CurrentTechnique.Passes[p].Begin();

for (int i = 0; i < model.Meshes.Count; i++)
{
mesh = model.Meshes[i];
game.GraphicsDevice.Indices = mesh.IndexBuffer;

for (int j = 0; j < mesh.MeshParts.Count; j++)
{
part = mesh.MeshParts[j];

game.GraphicsDevice.VertexDeclaration = part.VertexDeclaration;
game.GraphicsDevice.Vertices[0].SetSource(
mesh.VertexBuffer,
part.StreamOffset,
part.VertexStride);

game.GraphicsDevice.DrawIndexedPrimitives(
PrimitiveType.TriangleList,
part.BaseVertex,
0,
part.NumVertices,
part.StartIndex,
part.PrimitiveCount);
}
}

game.GraphicsDevice.Vertices[0].SetSource(null, 0, 0);
game.GraphicsDevice.VertexDeclaration = null;
game.GraphicsDevice.Indices = null;

for (int p = 0; p < effect.CurrentTechnique.Passes.Count; p++)
effect.CurrentTechnique.Passes[p].End();

effect.End();
}

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