我想尝试使用 Go 的图形库。我找到了以下示例:
package main
import (
"image"
"image/color"
"image/png"
"log"
"os"
)
func main() {
width, height := 512, 512
canvas := NewCanvas(image.Rect(0, 0, width, height))
canvas.DrawGradient()
// Draw a series of lines from the top left corner to the bottom of the image
for x := 0; x < width; x += 8 {
canvas.DrawLine(color.RGBA{0, 0, 0, 255},
Vector{0.0, 0.0},
Vector{float64(x), float64(height)})
}
outFilename := "lines.png"
outFile, err := os.Create(outFilename)
if err != nil {
log.Fatal(err)
}
defer outFile.Close()
log.Print("Saving image to: ", outFilename)
png.Encode(outFile, canvas)
}
但是,构建时似乎缺少某些类。
D:\go\work>go build draw.go
# command-line-arguments
.\draw.go:13: undefined: NewCanvas
.\draw.go:19: undefined: Vector
.\draw.go:20: undefined: Vector
我的环境对于 HelloWorld 示例运行良好,但是在导入图像库时似乎缺少某些东西。对新手入门有什么帮助吗?
最佳答案
您需要按照依赖顺序包含每个 .go
文件。
假设您正在使用此库,请尝试按此顺序运行主要文件:https://github.com/felixpalmer/go_images
go run draw.go canvas.go vector.go
关于Go:未定义的类,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34922901/