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//
// RegularPolyShape.m
// TikZiT
//
// Copyright 2011 Aleks Kissinger
// Copyright 2012 Alex Merry
// All rights reserved.
//
// This file is part of TikZiT.
//
// TikZiT is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// TikZiT is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with TikZiT. If not, see <http://www.gnu.org/licenses/>.
//
#import "RegularPolyShape.h"
#import "Node.h"
#import "Edge.h"
#import "util.h"
@implementation RegularPolyShape
- (id)initWithSides:(int)sides rotation:(int)rotation {
self = [super init];
if (self == nil)
return nil;
// TikZ draws regular polygons using a radius inscribed
// _inside_ the shape (touching middles of edges), not
// outside (touching points)
const float innerRadius = 0.2f;
NSMutableArray *nodes = [NSMutableArray arrayWithCapacity:sides];
NSMutableArray *edges = [NSMutableArray arrayWithCapacity:sides];
float dtheta = (M_PI * 2.0f) / ((float)sides);
float theta = (dtheta/2.0f) - (M_PI / 2.0f);
theta += degreesToRadians(rotation);
// radius of the outer circle
float radius = ABS(innerRadius / cos(dtheta));
for (int i = 0; i < sides; ++i) {
NSPoint p;
p.x = radius * cos(theta);
p.y = radius * sin(theta);
[nodes addObject:[Node nodeWithPoint:p]];
theta += dtheta;
}
for (int i = 0; i < sides; ++i) {
[edges addObject:[Edge edgeWithSource:[nodes objectAtIndex:i]
andTarget:[nodes objectAtIndex:(i+1)%sides]]];
}
paths = [[NSSet alloc] initWithObjects:edges,nil];
styleTikz = [[NSString alloc] initWithFormat:
@"regular polygon,regular polygon sides=%d,shape border rotate=%d",
sides, rotation];
return self;
}
@end
// vi:ft=objc:ts=4:noet:sts=4:sw=4
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