//

//  NSBezierPath_Polygons.m

//  Polygons

//

//  Created by jcr on Mon Apr 29 2002.

//  Copyright (c) 2002 Apple Computer, Inc. All rights reserved.

//

#import "NSBezierPath_Polygons.h"

@implementation NSBezierPath (Polygons)

+ (NSBezierPath *) polygonWithSides:(unsigned int) sides

// Returns a regular polygon, inscribed in the unit circle with the given number of sides.

  {

  if (sides > 0) // Sanity check.  Must have at least one side..

    {  

    float theta = M_PI * 2;  //This makes a full circle in radians.  See Math.h for the defintion of M_PI

    float sliceAngle = theta / sides;

    int index = sides;

    NSBezierPath *path = [self bezierPath];

    [path moveToPoint:NSMakePoint(1.0, 0)];  // start at a point on the circle..

    while (--index)  // count down

      {

      theta -= sliceAngle;

      [path lineToPoint: NSMakePoint(cos(theta),sin(theta))];

      }

    [path closePath];  // This gets you a proper linejoin for the last segment.

    return path;

    }

  return nil;

  }

+ (NSBezierPath *) meshedPolygonWithSides:(unsigned int) sides

  {

  if (sides > 0)  // Sanity check.  Must have at least one side..

    {

    int index = sides;

    float theta = M_PI * 2;  //This makes a full circle in radians.  See Math.h for the defintion of M_PI

    float sliceAngle = theta / sides;

    NSPoint *perimeterPoints;

    NSBezierPath *path = [self bezierPath];

    perimeterPoints = alloca (sides * sizeof(NSPoint));  

    while (index--)

      {

      theta -= sliceAngle;

      perimeterPoints[index] = NSMakePoint(cos(theta),sin(theta));

      }

    index = sides;

    while (index--)

      {

      int subIndex = index;

        while (subIndex--)

          {

          [path moveToPoint:perimeterPoints[index]];

          [path lineToPoint:perimeterPoints[subIndex]];

          }

      }

    return path;

    }

  return nil;

  }

@end

@implementation NSBezierPath (drawAtPoint)

- (void) strokeAtPoint:(NSPoint) where inView:(NSView *) aView

// translates the origin of aView's coordinate system to the given point, strokes the reciever, and restores the origin

  {

  NSPoint 

    stashOrigin = [aView bounds].origin;

  [aView translateOriginToPoint:where];

  [self stroke];

  [aView setBoundsOrigin:stashOrigin];

  }

- (void) fillAtPoint:(NSPoint) where inView:(NSView *) aView

  {

  NSPoint

    stashOrigin = [aView bounds].origin;

  [aView translateOriginToPoint:where];

  [self fill];

  [aView setBoundsOrigin:stashOrigin];

  }

@end

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