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| package main
import (
"flag"
"fmt"
"image"
"image/color"
"image/draw"
"image/jpeg"
"log"
"os"
)
type OutputStrategy interface {
Draw() error
}
type TextSquare struct{}
func (t *TextSquare) Draw() error {
println("Circle")
return nil
}
type ImageSquare struct {
DestinationFilePath string
}
func (t ImageSquare) Draw() error {
width := 800
height := 600
bgColor := image.Uniform{color.RGBA{R: 70, G: 70, B: 70, A: 0}}
origin := image.Point{0, 0}
quality := &jpeg.Options{Quality: 75}
bgRectangle := image.NewRGBA(image.Rectangle{
Min: origin,
Max: image.Point{X: width, Y: height},
})
draw.Draw(bgRectangle, bgRectangle.Bounds(), &bgColor, origin, draw.Src)
squareWidth := 200
squareHeight := 200
squareColor := image.Uniform{color.RGBA{R: 255, G: 0, B: 0, A: 1}}
square := image.Rect(0, 0, squareWidth, squareHeight)
square = square.Add(image.Point{
X: (width / 2) - (squareWidth / 2),
Y: (width / 2) - (squareHeight / 2),
})
squareImg := image.NewRGBA(square)
draw.Draw(bgRectangle, squareImg.Bounds(), &squareColor, origin, draw.Src)
w, err := os.Create(t.DestinationFilePath)
if err != nil {
return fmt.Errorf("Error opening image")
}
defer w.Close()
if err = jpeg.Encode(w, bgRectangle, quality); err != nil {
return fmt.Errorf("Error writing image to disk")
}
return nil
}
var output = flag.String("output", "console", "The output to use between 'console' and 'image' file")
func main() {
flag.Parse()
var activeStrategy OutputStrategy
switch *output {
case "console":
activeStrategy = &TextSquare{}
case "image":
activeStrategy = &ImageSquare{"/tmp/image.jpg"}
default:
activeStrategy = &TextSquare{}
}
err := activeStrategy.Draw()
if err != nil {
log.Fatal(err)
}
}
|