C#でツールを作る その７ -グリッドと軸の描画-

C# DirectX


グリッドと軸

  • 3D頂点座標、頂点色
    • CustomVertex.PositionColored
  • １辺が１のラインをＸ方向、Ｚ方向にそれぞれ１１本＝１１＊２ライン
  • Ｘ軸、Ｙ軸、Ｚ軸＝３ライン
  • PrimitiveType.LineListで描画
  • とりあえず全体を５倍で描画
private VertexBuffer grid_axis = null;

private void CreateGridAndAxis()
{
    CustomVertex.PositionColored[] v = new CustomVertex.PositionColored[ 44 + 6 ];
    int color = Color.FromArgb( 0xcc, 0xcc, 0xcc ).ToArgb();
    float x = -0.5f, z = -0.5f;
    int index = 0;
    //
    //grid
    //
    for( int i = 0; i < 11; i ++ )
    {
        //X軸方向
        v[ index + 0 ] = new CustomVertex.PositionColored( -0.5f, 0.0f, z, color );
        v[ index + 1 ] = new CustomVertex.PositionColored(  0.5f, 0.0f, z, color );
        index += 2;
        z += 0.1f;
    }
    for( int i = 0; i < 11; i ++ )
    {
        //Z軸方向
        v[ index + 0 ] = new CustomVertex.PositionColored( x, 0.0f, -0.5f, color );
        v[ index + 1 ] = new CustomVertex.PositionColored( x, 0.0f, 0.5f, color );
        index += 2;
        x += 0.1f;
    }
    //
    //axis
    //
    v[ index + 0 ] = new CustomVertex.PositionColored( -1.0f, 0.0f, 0.0f, Color.Black.ToArgb() );
    v[ index + 1 ] = new CustomVertex.PositionColored( 1.0f, 0.0f, 0.0f, Color.Red.ToArgb() );
    v[ index + 2 ] = new CustomVertex.PositionColored( 0.0f, -1.0f, 0.0f, Color.Black.ToArgb() );
    v[ index + 3 ] = new CustomVertex.PositionColored( 0.0f, 1.0f, 0.0f, Color.FromArgb( 0, 255, 0 ).ToArgb() );
    v[ index + 4 ] = new CustomVertex.PositionColored( 0.0f, 0.0f, -1.0f, Color.Black.ToArgb() );
    v[ index + 5 ] = new CustomVertex.PositionColored( 0.0f, 0.0f, 1.0f, Color.Blue.ToArgb() );

    //
    //grid, axis用頂点バッファ生成
    //
    grid_axis = new VertexBuffer( typeof(CustomVertex.PositionColored), v.Length, device, Usage.None, CustomVertex.PositionColored.Format, Pool.Managed );
    using( GraphicsStream data = grid_axis.Lock( 0, 0, LockFlags.None ) )
    {
        data.Write( v );
        grid_axis.Unlock();
    }
}

if (grid_axis != null)
{
    grid_axis.Dispose();
    grid_axis = null;
}

device.Transform.World = Matrix.Scaling( 5.0f, 5.0f, 5.0f );//５倍
device.SetStreamSource( 0, grid_axis, 0 );
device.SetTexture( 0, null );
device.VertexFormat = CustomVertex.PositionColored.Format;
device.DrawPrimitives( PrimitiveType.LineList, 0, 22 + 3 );