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words.go
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words.go
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// Implementation of words exported to FORTH.
package main
import (
"math"
)
// set the direction, absolutely.
func direction() error {
val, err := e.Stack.Pop()
if err != nil {
return err
}
// degree -> radians
val = val * (math.Pi / 180)
g.Direction(val)
return nil
}
// move forwards.
func forward() error {
val, err := e.Stack.Pop()
if err != nil {
return err
}
g.Forward(val)
return nil
}
// pen teleports to x,y.
func move() error {
y, err := e.Stack.Pop()
if err != nil {
return err
}
x, err := e.Stack.Pop()
if err != nil {
return err
}
g.Move(x, y)
return nil
}
// Set the pen up/down
func pen() error {
val, err := e.Stack.Pop()
if err != nil {
return err
}
if val == 0 {
g.PenUp()
} else {
g.PenDown()
}
return nil
}
// Save the image, and the animation.
func save() error {
// write the image (PNG)
err := g.WriteImage("turtle.png")
if err != nil {
return err
}
// Write the animation (GIF).
err = g.WriteAnimation("turtle.gif")
if err != nil {
return err
}
saved = true
return nil
}
// turn
func turn() error {
val, err := e.Stack.Pop()
if err != nil {
return err
}
// degree -> radians
val = val * (math.Pi / 180)
g.Turn(val)
return nil
}