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Re: confused about floats
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Re: confused about floats


  • Subject: Re: confused about floats
  • From: Kyle Sluder <email@hidden>
  • Date: Fri, 8 Oct 2010 12:13:42 -0700

Just wanted to confirm that this is a repost of the previous thread?

http://lists.apple.com/archives/cocoa-dev/2010/Oct/msg00117.html

--Kyle Sluder

On Tue, Oct 5, 2010 at 2:07 AM, Amy Heavey <email@hidden> 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.
>
> Many Thanks
>
> Amy
>
> Full code being used:
>        - (IBAction)generateKitImages:(id)sender;
> {
>        NSObject *kit;
>        kit = [[kits selectedObjects] objectAtIndex:0];
>
>        NSString* fileName = [[kit valueForKey:@"kitName"]
> stringByAppendingString:@".jpg"];
>        NSString* kitimagePath = [[[[self applicationSupportFolder]
> stringByAppendingPathComponent:@"images"]
> stringByAppendingPathComponent:@"kit"]
> stringByAppendingPathComponent:fileName];
>        //NSLog(@"Kit Image Path: %@", kitimagePath);
>        //create new image 300px square
>         NSImage *targetImage;
>         NSSize targetSize = NSMakeSize (300, 300);
>         targetImage = [[NSImage alloc] initWithSize:targetSize];
>
>
>        //select all images for kit
>         NSArray* kitImages = [kit
> valueForKeyPath:@"kitItems.kitItemProduct.productImage"];
>
>        //set coordinates to x,y -> 0,0 to start
>        float x = 0;
>        float y = 0;
>        //for each image
>        NSEnumerator *imageLoop = [kitImages objectEnumerator];
>        NSString *imgPath;
>        while ((imgPath = [imageLoop nextObject])) {
>                NSImage *img = [[NSImage
> alloc]initWithContentsOfFile:imgPath];
>                //NSLog(@"Image: %@",img);
>                //resize to 100px high
>                        //get original size
>                //NSSize *origSize;
>                //origSize = [img size];
>                        //calculate scale factor
>                        //[img setScalesWhenResized: YES];
>                        //[img setSize: NSMakeSize (100., 100.)];
>
>                //apply image to view
>                [targetImage lockFocus];
>                [img drawInRect:NSMakeRect(x,y,100,100)
>                                  fromRect:NSMakeRect(x,y,100,100)
>                                 operation:NSCompositeCopy
>                                  fraction:1];
>
>                [targetImage unlockFocus];
>
>                //set new coordinates
>                x = x+100;
>
>                //if coordinates are too wide, start new row - if x>300,
> reset x to 0 and add 100 to y
>                if(x > 300){
>                        x = 0;
>                        y = y+100;
>                }
>
>        }
>        //apply kit logo to view
>        //apply kit date (text) to view
>        //save files out
>        //create a NSBitmapImageRep
>        NSBitmapImageRep *bmpImageRep = [[NSBitmapImageRep
> alloc]initWithData:[targetImage TIFFRepresentation]];
>        //add the NSBitmapImage to the representation list of the target
>        [targetImage addRepresentation:bmpImageRep];
>
>        //get the data from the representation
>        NSData *data = [bmpImageRep representationUsingType: NSJPEGFileType
>
>             properties: nil];
>
>        //write the data to a file
>        [data writeToFile: kitimagePath
>                   atomically: NO];
>        //link images to kit
>        [kit setValue:kitimagePath forKey:@"kitImage"];
> }
>
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References: 
 >confused about floats (From: Amy Heavey <email@hidden>)

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