orx/orx-turtle/README.md

orx-turtle

Bezier (ShapeContour) backed turtle graphics.

The turtle language

The basic turtle language consists of:

• rotate(degrees: Double) to rotate
• forward(distance: Double to walk forward
• penUp() to raise the pen
• penDown() to lower the pen, this will start a new contour

Orientation/direction and position can be set directly

• position: Vector2 get/set position of the turtle, teleporting the turtle will start a new contour
• direction: Vector2 get/set direction of the turtle, setting direction will compute orientation
• orientation: Matrix44 the orientation matrix from which direction is evaluated
• isPenDown: Boolean

The language also holds some tools to manage the position and orientation of the turtle.

• resetOrientation() will reset the orientation to the default orientation
• push() push the position and orientation on the stack
• pop() pop the position and orientation from the stack
• pushOrientation() push the orientation on the stack
• popOrientation() pop the orientation on the stack
• pushPosition() push the position on the stack
• popPosition() pop the position from the stack

The extended turtle language

• segment(s: Segment) to draw a segment with its entrance tangent aligned to the turtle's orientation
• contour(c: ShapeContour) to draw a contour with its entrance tangent aligned to the turtle's orientation

Demos

DemoTurtle01

source code

DemoTurtle02

source code

DemoTurtle03

source code