erpsuiteios/common/SCShapeView.m

/*
 Copyright 2013 Scott Logic Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */


#import "SCShapeView.h"

@interface SCShapeView () {
    CAShapeLayer *_outline;
}
@end

@implementation SCShapeView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        _outline = [CAShapeLayer new];
        _outline.strokeColor = [[[UIColor blueColor] colorWithAlphaComponent:0.8] CGColor];
        _outline.lineWidth = 2.0;
        _outline.fillColor = [[UIColor clearColor] CGColor];
        [self.layer addSublayer:_outline];
    }
    return self;
}

- (void)setCorners:(NSArray *)corners
{
    if(corners != _corners) {
        _corners = corners;
        _outline.path = [[self createPathFromPoints:corners] CGPath];
    }
}

- (UIBezierPath *)createPathFromPoints:(NSArray *)points
{
    UIBezierPath *path = [UIBezierPath new];
    // Start at the first corner
    [path moveToPoint:[[points firstObject] CGPointValue]];
    
    // Now draw lines around the corners
    for (NSUInteger i = 1; i < [points count]; i++) {
        [path addLineToPoint:[points[i] CGPointValue]];
    }
    
    // And join it back to the first corner
    [path addLineToPoint:[[points firstObject] CGPointValue]];
    
    return path;
}

@end