Go 方法参数和 float64 数组给出意外错误

Question

编译以下代码时...

package camera

type camera struct {
    position [3]float64
    viewWidth int
    viewHeight int
}

func (c camera) SwitchToCartesianThreeSpace(x, y int) [3]float64 { // LINE 9
    var x3 float64 = 0 // view is set to the origin
    var y3 float64 = float64(x) - (float64(c.viewWidth) / 2)
    var z3 float64 = float64(-y) + (float64(c.viewHeight) / 2)
    result := [3]float64{x3, y3, z3}                               // LINE 13
    return result
}

...出现以下错误。

camera/camera.go:9: undefined: x
camera/camera.go:9: undefined: y
camera/camera.go:11: undefined: x
camera/camera.go:12: undefined: y
camera/camera.go:13: cannot use x3 (type float64) as type [3]float64 in array element
camera/camera.go:13: cannot use y3 (type float64) as type [3]float64 in array element
camera/camera.go:13: cannot use z3 (type float64) as type [3]float64 in array element

到目前为止，我已经写了相当多的 Go 代码，但不明白为什么会出现第 9 行或第 13 行的错误!谁能解释一下？

Answer 1

隔离 in a playgroud ，它编译得很好，并且有预期的输出:

c := camera{}
res := c.SwitchToCartesianThreeSpace(2, 3)
// res is [0 2 -3]

您需要尝试使用包含仅该代码的camera.go，或者检查camera.go 文件如何适合您的current workspace .