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Bindings - other languages => DotNet => Topic started by: RcColes on June 26, 2013, 01:21:56 pm

Title: 'System.AccessViolationException' when using Inversetransform on a sprite
Post by: RcColes on June 26, 2013, 01:21:56 pm

I'm not sure if this is a bug or if I'm fundamentally misunderstanding how this function works, but whenever I call InverseTransform on a sprite it crashes with  "'System.AccessViolationException' occurred in mscorlib.dll".

namespace Testcase
{
    class Program
    {
        static void Main(string[] args)
        {
            Sprite sp1 = new Sprite(new Texture("test.png")); //16*16 image

            sp1.Transform.Translate(1, 1); // make sure it has a transform applied

            Transform step1 = sp1.Transform;

            Transform step2 = step1.GetInverse(); //crashes here
        }
    }
}

Note that in the testcase I get the transform then call GetInverse, so that I could isolate the problem the the inversion of the transform.

Title: Re: 'System.AccessViolationException' when using Inversetransform on a sprite
Post by: Laurent on June 26, 2013, 01:33:23 pm

The Transform property is read-only (if only it was supported by C#...), you're not supposed to call Translate on it, the result is undefined.

Title: Re: 'System.AccessViolationException' when using Inversetransform on a sprite
Post by: RcColes on June 26, 2013, 02:39:00 pm

Unfortunately the problem is still occurring when the call to transform.translate is removed, and replaced with what I think is the correct method for translating sprites.

namespace Testcase
{
    class Program
    {
        static void Main(string[] args)
        {
            Sprite sp1 = new Sprite(new Texture("test.png")); //16*16 image
            sp1.Position = new Vector2f(1,1);

            Transform step1 = sp1.Transform;

            Transform step2 = step1.GetInverse(); //crashes here
        }
    }
}