diagonal lines from the top right trying to draw on a UIView - ios

Question

I've got a tablet called a Slate that I can process x,y points from. I can pass these x,y points to my "drawShape" function, the equivalent of a touchesMoved function. I have a custom UIView class designed for this purpose with 4 main functions. The first three are touchesbegan/moved/ended and there is a drawRect.
Here's the source to the UIView subclass...
//
// DrawingLayerView.m
//
//
// Created by Monica Kachlon on 12/3/17.
//
#import "DrawingLayerView.h"
#include "UIBezierPath+Interpolation.h"
#interface StrokeA : NSObject
#property (assign, nonatomic) CGPoint startPoint;
- (id)initWithStartPoint:(CGPoint)point;
#property (strong, nonatomic) NSMutableArray * points;
#end
#implementation StrokeA
- (id)initWithStartPoint:(CGPoint)point {
self = [super init];
self.startPoint = point;
self.points = [NSMutableArray array];
return self;
}
#end
#implementation DrawingLayerView
NSMutableArray * strokes;
NSMutableArray * points;
StrokeA * currentStroke;
UIBezierPath * currentPath;
UIBezierPath *path;
UIBezierPath *pathTwo;
UIBezierPath *Newpath;
CAShapeLayer * currentLayer;
- (void) noodlez
{
path = [UIBezierPath bezierPath];
currentPath = [UIBezierPath bezierPath];
pathTwo = [UIBezierPath bezierPath];
Newpath = [UIBezierPath bezierPath];
strokes = [NSMutableArray array];
points = [NSMutableArray array];
}
- (void)startTouch: (CGPoint)point
{
currentStroke = [[StrokeA alloc] initWithStartPoint:point];
[strokes addObject:currentStroke];
}
- (UIBezierPath *)createPath {
UIBezierPath * bezierPath = [UIBezierPath bezierPath];
for (StrokeA * stroke in strokes) {
[bezierPath moveToPoint:stroke.startPoint];
for (NSValue * value in stroke.points) {
[bezierPath addLineToPoint:[value CGPointValue]];
}
}
return bezierPath;
}
- (void)endTouch: (CGPoint)point
{
[points removeAllObjects];
[self setNeedsDisplay];
}
- (void)drawShape: (CGPoint)point
{
if (!currentStroke) {
[self startTouch:point];
}
[currentStroke.points addObject:[NSValue valueWithCGPoint:point]];
pathTwo = [self createPath];
[self setNeedsDisplay];
}
- (void)drawRect:(CGRect)rect {
[[UIColor blackColor] setStroke];
[pathTwo stroke];
}
#end
And here's the screenshot.
I tried writing "Ok?" Just to illustrate the issue.

Answer 1

Despite the fact that the code is lacking some detail and the question is poorly worded, the screenshot is clearly showing that the initial point for the path is (0,0) in each case. Dump the points in the paths out to the console and you'll see it. Figure out how those (0,0)'s are getting in there and you'll solve the problem.