TurtleBezierPath
TurtleBezierPath is a UIBezierPath subclass for Turtle Graphics: a simple, intuitive drawing system developed my Seymour Papert for the Logo programming language.
The Turtle is a drawing cursor that follows the commands: home, turn, forward, leftArc, rightArc, up and down. As the Turtle moves, it draws a path in its wake. Many shapes are much easier to draw this way.
Demo app
The app requires iOS 7 and allows you to explore Turtle Graphics drawing with simple controls. It's fun too!
Installation
Simply add TurtleBezierPath.h and TurtleBezierPath.m to your project, or add it as a Cocoapod named TurtleBezierPath.
TurtleBezierPath will work with both ARC and MRC projects.
@interface
Both NSCoding and NSCopying are fully supported.
@property( nonatomic, assign ) CGFloat bearing; // The compass bearing of the Turtle in degrees
- 0 - North
- 90 - East
- 180 - South
- 270 - West
@property( nonatomic, assign ) BOOL penUp; // When YES the Turtle will move but not draw
-(CGRect)boundsWithStroke; // The bounds rect of the path including the stroke width
-(void)home; // Move the Turtle to ( 0, 0 ) and set the bearing to 0 degrees
-(void)forward:(CGFloat)distance; // Move the Turtle forward distance points
-(void)turn:(CGFloat)angle; // Add angle degrees to the Turtle's bearing
-(void)leftArc:(CGFloat)radius turn:(CGFloat)angle; // Move the Turtle angle degrees in an anti-clockwise arc of radius points
-(void)rightArc:(CGFloat)radius turn:(CGFloat)angle; // Move the Turtle angle degrees in a clockwise arc of radius points
-(void)down; // Move the pen down
-(void)up; // Move the pen up
-(void)centreInBounds:(CGRect)bounds; // Transform the path so that the home position is in the centre of the bounds