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float dashPhase = 0.0;
float dashLengths[] = {30, 30};
CGContextSetLineDash(context, dashPhase, dashLengths, 20.0);
self.previousPoint2 = self.previousPoint1;
self.previousPoint1 = previous;
self.currentPoint = current;
self.mid1 = [self pointBetween:self.previousPoint1 andPoint:self.previousPoint2];
self.mid2 = [self pointBetween:self.currentPoint andPoint:self.previousPoint1];
UIBezierPath* newPath = [UIBezierPath bezierPath];
[newPath moveToPoint:self.mid1];
[newPath addLineToPoint:self.mid2];
[newPath setLineWidth:self.brushSize];