array in struct C#

Question

I 've problem with array in C#. I'm quite new in C# I'm used to do programs in java. I'm trying to transfer this code from C++ to C#. This is code in C++

typedef struct point_3d {           // Structure for a 3-dimensional point (NEW)
    double x, y, z;
} POINT_3D;

typedef struct bpatch {             // Structure for a 3rd degree bezier patch (NEW)
    POINT_3D    anchors[4][4];          // 4x4 grid of anchor points
    GLuint      dlBPatch;               // Display List for Bezier Patch
    GLuint      texture;                // Texture for the patch
} BEZIER_PATCH;

I have struct Vector3 in C# which is float x,y,z (I don't need double ...) Now I'm trying to make structure bpatch and I have problems with the declaration of array

[StructLayout(LayoutKind.Sequential)]
struct BPatch
{
  Vector3[][] anchors = new Vector3[4][4]; //there is the problem
  uint dblPatch; // I'll probably have to change this two lines but it doesn't matter now
  uint texture; 

}

what do I do wrong?? I need aray 4x4 in structure, its type should be structure Vector3 which is declared as float x, float y, float z. Thanks

What makes you think that the C++ POINT_3D translates to the .NET Vector3? — Oded
– Oded, Commented Dec 31, 2011 at 15:58
Why not? I work according this tutorial from NEHE nehe.gamedev.net/tutorial/bezier_patches__fullscreen_fix/18003 and point3D has coordinates x,y,z and Vector3 I mentioned is ready to use in library which made gave to us our teacher at university, also with operations add and others.. so I used it. — user1097772
– user1097772, Commented Dec 31, 2011 at 16:45

Tudor · Accepted Answer · 2011-12-31 16:02:17Z

3

You can use:

Vector3[,] anchors = new Vector3[4,4];

answered Dec 31, 2011 at 16:02

Tudor

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1 Comment

Ivo Over a year ago

Exactly! that's a matrix in c#

Ivo · Accepted Answer · 2011-12-31 16:01:32Z

1

In C#, Vector3[][] is not a matrix but an array of arrays. So, you will need to do this:

anchors = new Vector3[4][];
for(var i=0;i<anchors.Length;i++)
    anchors[i] = new Vector3[4];

Here's some documentation from msdn http://msdn.microsoft.com/en-us/library/2s05feca.aspx

Another way, inline:

Vector3[][] anchors = new Vector3[][]{new Vector3[4],new Vector3[4],new Vector3[4],new Vector3[4]};

Hope it helps.

answered Dec 31, 2011 at 16:01

Ivo

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