Also if x is a float, make sure you use the proper type cast, or values, ie (
x = x + 120.00) or (x = y + (double)z , where x and y are double and z is an
int).
Remember int, float, double, are C types, and typecasting rules should be in
effect.
> From: gwes...@mac.com
> Date: Tue, 5 Oct 2010 09:27:31 -0400
> To: cocoa-dev@lists.apple.com
> Subject: Re: Confused about floats
>
> Amy Heavey wrote:
>
> > I've got two float values (x and y) that I'm using to change the
> > coordinates of a drawing action that is being looped through. I can
> > add a value to x and it draws the next image along, but I want to test
> > the value of x and if it is out of bounds I want to reset it to zero
> > and increase y, so I get a grid of images drawn.
> >
> > For some reason, even though I can do
> > x = x+128;
> > and it moves the image accross, x seems to be null so I can't test
> > against it, my if statement ' if (x > 300){' always fails.
> >
> > This must be something really simple I just can't see it this morning?
> > I'd appreciate any help.
>
> This doesn't make a whole lot of sense. There's no such thing as a null float
> value and you shouldn't need to be saying "x seems to be" any particular
> value given that you have a debugger and can actually examine the value.
>
> Frankly, my guess is that your problem is the second argument to the drawing
> method:
>
> > [img drawInRect:NSMakeRect(x,y,100,100)
> > fromRect:NSMakeRect(x,y,100,100)
> > operation:NSCompositeCopy
> > fraction:1];
>
> Are you sure that the interesting part of each source image is offset within
> its whole internal coordinate space by the same amount as you intend to draw
> it into the destination. Or should that second argument perhaps be replaced
> by a rectangle whose origin is at (0,0)?
>
>
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