Estoy trabajando en una aplicación de dibujo, donde el usuario puede dibujar / escribir con su dedo o lápiz. Para esto he referido código dehttps://github.com/yusenhan/Smooth-Line-View, en mi solicitud.

El problema al que me enfrento es que, a veces, la escritura cuando se escribe muy de cerca no es muy fluida.

Así que creo que estoy cometiendo un error al obtener el punto de control.

Abajo esta mi codigo

// Encuentra el punto medio

CGPoint midPoint(CGPoint p1, CGPoint p2)
{
    return CGPointMake((p1.x + p2.x) * 0.5, (p1.y + p2.y) * 0.5);
}

#pragma mark Gesture handle
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    UITouch *touch = [touches anyObject];
    //LocationInView returns the current location of the reciever in coordinate system of the given View.
    m_previousPoint1 = [touch locationInView:self];
    m_previousPoint2 = [touch locationInView:self];
    m_currentPoint   = [touch locationInView:self];    

    [self touchesMoved:touches withEvent:event];}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{          
    //AnyObject:- Returns one of the objects in the set, or nil if the set contains no objects.
    UITouch *touch  = [touches anyObject];

    m_previousPoint2  = m_previousPoint1;
    m_previousPoint1  = m_currentPoint;
    m_currentPoint    = [touch locationInView:self];

    if(m_drawStep != ERASE)
    {
        m_drawStep = DRAW;
        m_drawing  = TRUE;        
    }    
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0.0);//creates a graphics context suitable for use as an image(size of the image,opquae,scale, if scale = 0.0, means platform will take care of scaling)
    [self.layer renderInContext:UIGraphicsGetCurrentContext()];
    m_curImage = UIGraphicsGetImageFromCurrentImageContext();// to turn the context into a UIImage    
    UIGraphicsEndImageContext();

 }

- (void)drawRect:(CGRect)rect
{
   CGPoint mid1 = midPoint(m_previousPoint1, m_previousPoint2);
   CGPoint mid2 = midPoint(m_currentPoint, m_previousPoint1);            

   [m_curImage drawAtPoint:CGPointMake(0, 0)];

   CGContextRef context = UIGraphicsGetCurrentContext();//Get a reference to current context(The context to draw)
   [self.layer renderInContext:context];
   //Simply keep referring to this context in below functions with proper arguments.
   CGContextMoveToPoint(context, mid1.x, mid1.y);//Position the current point
   CGContextAddQuadCurveToPoint(context, m_previousPoint1.x, m_previousPoint1.y, mid2.x, mid2.y);     
   CGContextSetLineCap(context, kCGLineCapRound);
   CGContextSetBlendMode(context, kCGBlendModeNormal);
   CGContextSetLineJoin(context, kCGLineJoinRound);
   CGContextSetLineWidth(context, self.lineWidth);
   CGContextSetStrokeColorWithColor(context, self.lineColor.CGColor);
   CGContextSetShouldAntialias(context, YES);
   CGContextSetAllowsAntialiasing(context, YES);
   CGContextSetAlpha(context, self.lineAlpha);           
   CGContextSetFlatness(context, 0.6);
   CGContextStrokePath(context);//paints(fills) the line along the current path.            
}

Según yo, los puntos que paso en elCGContextAddQuadCurveToPoint Se puede modificar, pero no puedo conseguirlo. Leí documentos para encontrar puntos de control paraBezier Curve, pero no estoy entendiendo.

Así que amigos, por favor, ayúdenme a entender en qué me estoy equivocando.