edwardinubuntu / painter Goto Github PK

// draws the given squiggle into the given context
- (void)drawSquiggle:(Squiggle *)squiggle inContext:(CGContextRef)context {
  ...
  // move to the point
  CGContextMoveToPoint(context, firstPoint.x, firstPoint.y);
  ...   
  // draw a line from each point to the next in order
  for (int i=1; i < [points count]; i++) {
    NSValue *value = [points objectAtIndex:i];
    CGPoint point;  // declare a new point
    [value getValue:&point];    // store the value in point

    // draw a line to the new point
    CGContextAddLineToPoint(context, point.x, point.y);
  }  // end for
  ...
  CGContextStrokePath(context);
  ...
}

- (void)resetView {
    [squiggles removeAllObjects];
    [finishedSquiggles removeAllObjects];
    [self setNeedsDisplay]; // refresh the display
}

// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code.
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    for (Squiggle *squiggle in finishedSquiggles)
        [self drawSquiggle:squiggle inContext:context];
    
    for (NSString *key in squiggles) {
        Squiggle *squiggle = [squiggles valueForKey:key];
        [self drawSquiggle:squiggle inContext:context];
    }
}