//
//  MyPolygon.m
//  B-spline
//
//  Created by Alexander Powell on Mon Aug 26 2002.
//  Copyright (c) 2002 __MyCompanyName__. All rights reserved.
//

#import "MyPolygon.h"


@implementation MyPolygon

- (id)init
{
    if (self = [super init])
    {
        points = [[NSMutableArray alloc] init];
        return self;
    }
    return nil;
}

- (void)dealloc
{
    [points release];
    [super dealloc];
}

- (void)loadFromFile:(NSString *)filename
{
    int ii, numPoints;
    NSString *file, *trimmed;
    NSArray *pointsAsStrings;
    
    // Reset the points array
    [points release];
    points = [[NSMutableArray alloc] init];
    
    file = [NSString stringWithContentsOfFile: filename];
    //trimmed = [file stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
    trimmed = file;
    
    pointsAsStrings = [trimmed componentsSeparatedByString: @" : "];
    numPoints = [pointsAsStrings count];
    
    for (ii = 0; ii < numPoints; ii++)
    {
        MyPoint *newPoint;
        float currentZ = 0.0f;
        NSString *currentPointString = [pointsAsStrings objectAtIndex: ii];
        NSArray *currentPointAsStrings = [currentPointString componentsSeparatedByString: @","];
        
        // Read the first 2 components as x and y, respectively, and the third (if it exists)
        // as z....
        if ([currentPointAsStrings count] > 2)
            currentZ = [[currentPointAsStrings objectAtIndex: 2] floatValue];
        newPoint = [[MyPoint alloc] initWithX: [[currentPointAsStrings objectAtIndex: 0] floatValue] y: [[currentPointAsStrings objectAtIndex: 1] floatValue] z: currentZ];
        
        [points addObject: newPoint];
        [newPoint release];	// release now, since the point was retained when added to the array
    }
}

- (MyPolygon*)subdivideWith:(int)subdivisionType
{
    MyPolygon *newPolygon = [[MyPolygon alloc] init];
    
    switch (subdivisionType) {
        case SPLIT_AND_TWEAK:
            [newPolygon setPoints: splitAndTweak(points)];
            break;
        case FOUR_POINT:
            [newPolygon setPoints: fourPoint(points)];
            break;
    }
    
    return newPolygon;	// CAUTION: must be released by caller... this is kinda sloppy
}

- (void)setPoints:(NSMutableArray *)newPoints
{
    [newPoints retain];
    [points release];
    points = newPoints;
}

- (void)drawSelf
{
    int ii;
    
    glBegin(GL_LINE_LOOP);
        for (ii = 0; ii < [points count]; ii++)
        {
            MyPoint *currentPoint = [points objectAtIndex: ii];
            glVertex3f([currentPoint x], [currentPoint y], [currentPoint z]);
        }
    glEnd();
}

@end