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words.go
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words.go
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// Implementation of words exported to TCL.
package main
import (
"fmt"
"math"
"strconv"
"github.com/skx/critical/interpreter"
)
// set the direction, absolutely.
func direction(i *interpreter.Interpreter, args []string) (string, error) {
if len(args) != 1 {
return "", fmt.Errorf("direction requires a single (numeric) argument")
}
val, err := strconv.ParseFloat(args[0], 64)
if err != nil {
return "", err
}
// degree -> radians
val = val * (math.Pi / 180)
g.Direction(val)
return "", nil
}
// move forwards.
func forwards(i *interpreter.Interpreter, args []string) (string, error) {
if len(args) != 1 {
return "", fmt.Errorf("forwards requires a single (numeric) argument")
}
val, err := strconv.ParseFloat(args[0], 64)
if err != nil {
return "", err
}
g.Forward(val)
return "", nil
}
// pen teleports to x,y.
func move(i *interpreter.Interpreter, args []string) (string, error) {
if len(args) != 2 {
return "", fmt.Errorf("move requires a pair of (numeric) arguments")
}
x := 0.0
y := 0.0
var err error
x, err = strconv.ParseFloat(args[0], 64)
if err != nil {
return "", err
}
y, err = strconv.ParseFloat(args[1], 64)
if err != nil {
return "", err
}
g.Move(x, y)
return "", nil
}
// Set the pen up/down
func pen(i *interpreter.Interpreter, args []string) (string, error) {
if len(args) != 1 {
return "", fmt.Errorf("pen requires a single (numeric) argument")
}
val, err := strconv.Atoi(args[0])
if err != nil {
return "", err
}
if val == 0 {
g.PenUp()
} else {
g.PenDown()
}
return "", nil
}
// Save the image, and the animation.
func save(i *interpreter.Interpreter, args []string) (string, 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(i *interpreter.Interpreter, args []string) (string, error) {
if len(args) != 1 {
return "", fmt.Errorf("turn requires a single (numeric) argument")
}
val, err := strconv.ParseFloat(args[0], 64)
if err != nil {
return "", err
}
// degree -> radians
val = val * (math.Pi / 180)
g.Turn(val)
return "", nil
}