ArrayIndexOutOfBoundsException occurring only when using P2D scale()

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voxxel

ArrayIndexOutOfBoundsException occurring only when using P2D scale()

in Programming Questions • 2 years ago

I'm avoiding OPENGL because it has serious memory issues when dynamically loading images.

I don't seem to be able to use P3D as the ControlP5 menus are unreadable. However, scaling everything that is drawn on screen from 0->10.0 works fine.

When I switch to P2D, I get an "ArrayIndexOutOfBoundsException: 720" that occurs when I scale(5.7);

Does anyone have any ideas what could cause this behaviour? Why would an array behave fine under P3D scaling but not under P2D scaling?

Thanks

Replies(4)

amnon.owed

Re: ArrayIndexOutOfBoundsException occurring only when using P2D scale()

2 years ago

Do you have a small code example that shows this behaviour?

voxxel

Re: ArrayIndexOutOfBoundsException occurring only when using P2D scale()

2 years ago

for(int i=0; i<=Nrad; i++)
{
ellipse(0, 0, 2.0*ScreenRadii[i], 2.0*ScreenRadii[i]);
}

The ScreenRadii array length is equal to Nrad+1 (Nrad = 170), so the out-of-bounds should not even be happening, let alone at 720... ?

quarks

Re: ArrayIndexOutOfBoundsException occurring only when using P2D scale()

2 years ago

I don't seem to be able to use P3D as the ControlP5 menus are unreadable.

Try adding the statement below to setup it should solve this problem.

textMode(SCREEN);

The ScreenRadii array length is equal to Nrad+1 (Nrad = 170), so the out-of-bounds should not even be happening, let alone at 720... ?

Are you sure NRad = 170? Is NRad a calculated variable or a constant?

A safer way to iterate over arrays is to use the array length to stop the loop, using this then your example above becomes

for(int i=0; i< ScreenRadii.length ; i++)

{

ellipse(0, 0, 2.0*ScreenRadii[i], 2.0*ScreenRadii[i]);

}

Provided the array has been created it is now impossible for i to hold an invalid array index value.

voxxel

Re: ArrayIndexOutOfBoundsException occurring only when using P2D scale()

2 years ago

Try adding the statement below to setup it should solve this problem.

textMode(SCREEN);

This did not seem to help... I would love to be able to use P3D instead of OPENGL :(

Are you sure NRad = 170? Is NRad a calculated variable or a constant?

Yes, it is a constant. I'll iterate over the length instead though.

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