50 lines
2.0 KiB
Markdown
50 lines
2.0 KiB
Markdown
# orx-turtle
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Bezier (`ShapeContour`) backed [turtle graphics](https://en.wikipedia.org/wiki/Turtle_graphics).
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## The turtle language
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The basic turtle language consists of:
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* `rotate(degrees: Double)` to rotate
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* `forward(distance: Double` to walk forward
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* `penUp()` to raise the pen
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* `penDown()` to lower the pen, this will start a new contour
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Orientation/direction and position can be set directly
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* `position: Vector2` get/set position of the turtle, teleporting the turtle will start a new contour
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* `direction: Vector2` get/set direction of the turtle, setting direction will compute `orientation`
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* `orientation: Matrix44` the orientation matrix from which `direction` is evaluated
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* `isPenDown: Boolean`
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The language also holds some tools to manage the position and orientation of the turtle.
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* `resetOrientation()` will reset the orientation to the default orientation
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* `push()` push the position and orientation on the stack
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* `pop()` pop the position and orientation from the stack
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* `pushOrientation()` push the orientation on the stack
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* `popOrientation()` pop the orientation on the stack
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* `pushPosition()` push the position on the stack
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* `popPosition()` pop the position from the stack
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## The extended turtle language
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* `segment(s: Segment)` to draw a segment with its entrance tangent aligned to the turtle's orientation
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* `contour(c: ShapeContour)` to draw a contour with its entrance tangent aligned to the turtle's orientation
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<!-- __demos__ -->
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## Demos
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### DemoTurtle01
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[source code](src/jvmDemo/kotlin/DemoTurtle01.kt)
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### DemoTurtle02
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[source code](src/jvmDemo/kotlin/DemoTurtle02.kt)
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### DemoTurtle03
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[source code](src/jvmDemo/kotlin/DemoTurtle03.kt)
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