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Rotation problem


Hi people!

I have a file that contains data as char (-128 to 127) about a design that I want create in a View with Cocoa.

The file contains X and Y movements as tenths of millimeters (0.1mm).

I used the following code to do it:

  #define		XFORM_FACTOR		2.58 (pixel dimension of my screen)
  #define		MM2PX( val )		( val / XFORM_FACTOR)

  float coordX, coordY;
  float centerX, centerY;
  char buf[10000];
  int i=0;

  // class to construct the NSbezierpath of type line
  LineaC *path;

  NSData *data = [NSData dataWithContentsOfFile:pathFile];		
  [data getBytes:buf];
  centerX = 833; //generic point of myView to center the design
  centerY = 833;

  while (i<10000)
	{
      coordX = centerX+buf[i];
      i++;
      coordY = centerY+buf[i];

path = [[ LineaC alloc] initStartPt: NSMakePoint(MM2PX(centerX), MM2PX(centerY)) toPt: NSMakePoint( MM2PX(coordX), MM2PX(coordY) ) ] ;
[disegno addElement:path];
centerX = coordX;
centerY = coordY;
i++;
}

 and it's all ok.
 Then I want rotate the design  and I use the following code that is ok:

- (void)rotation:(float)grado
{
NSPoint center = NSMakePoint(833,833);

LineaC *elem;

NSPoint st[1];
NSPoint end[1];
int numElem = [disegno count];
NSBezierPath *path;
unsigned int i = 0;
NSAffineTransform *aff, *aff1, *aff2;

// scorro il vettore degli elementi grafici
for ( i = 0 ; i < numElem ; i ++ )
{
aff = [NSAffineTransform transform];
[aff translateXBy:-(center.x) yBy:-(center.y)];
aff1 = [NSAffineTransform transform];
[aff1 rotateByDegrees:-grado];
[aff appendTransform:aff1];
aff2 = [NSAffineTransform transform];
[aff2 translateXBy: center.x yBy: center.y];
[aff appendTransform:aff2];
elem = [ disegno objectAtIndex: i ];
NSBezierPath *path1 = [elem theLine];
path = [aff transformBezierPath:path1];

[path elementAtIndex:0 associatedPoints:st];
[path elementAtIndex:1 associatedPoints:end];

// costruisco un nuovo elemento linea con le nuove coordinate
elem = [[ LineaC alloc] initStartPt: NSMakePoint( st->x,st->y) toPt: NSMakePoint(end->x, end->y)] ;

[disegno replaceObjectAtIndex:i withObject:elem];
}
}

Well I need to save the design with rotation into a file as byte of type char:

#define		XFORM_FACTOR		2.58
#define		PX2MM( val )		( val * XFORM_FACTOR)

- (void)writeDesign
{
    unsigned char *byte;
	NSData *myData;
    byte = malloc(1);
    NSBezierPath *path;
    LineaC *elem;

    float centerX, centerY;
    NSPoint punto[1];

	elem = [disegno objectAtIndex: 0 ];
    path = [elem theLine];
    [path elementAtIndex:0 associatedPoints:punto];

    centerX = punto->x;
    centerY = punto->y;

    int xVal,yVal;
    float x,y;
   	int totale = [disegno count];

    for ( i = 0 ; i < totale ; i ++ )
    {
     elem = [disegno objectAtIndex: i ];
	 path = [elem theLine];
     [path elementAtIndex:1 associatedPoints:punto];

     x = PX2MM(((punto->x) - centerX));
     y = PX2MM(((punto->y) - centerY));
	
     NSString *xs = [NSString stringWithFormat:@"%.f", x];
     NSString *ys = [NSString stringWithFormat:@"%.f", y];

     xVal = [xs intValue];
     yVal = [ys intValue];

     // to have a char (-128 to 127)
	 if (xVal < 0)
          xVal = xVal+256;

     if (yVal < 0)
          yVal = yVal+256;
       		
     *byte = xVal ;
     [myData appendBytes:byte length: sizeof(unsigned char)];

     *byte = yVal ;
     [myData appendBytes:byte length: sizeof(unsigned char)];

     centerX = punto->x;
     centerY = punto->y;
    }


Some movements are wrong as dimension and the effect is a kind of trasposition (if it is the right name) of all path.

If someone could help me I can then sent an image as example of the design resulting.

Thanks,
Alessandra


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