[gocv][golang-opencv]示例教程(1-7)处理键盘输入

package main

import (
 "gocv.io/x/gocv"
 "image"
 "image/color"
 "log"
 "math/rand"
)

var (
 width  int
 height int
)

func main() {
 imageFilePath := "../../data/Lena.png"
 mat := gocv.IMRead(imageFilePath, gocv.IMReadAnyColor)
 if mat.Empty() {
  log.Panic("Can not read Image file : ", imageFilePath)
  return
 }

 window := gocv.NewWindow("Handling user input from keyboard")
 defer window.Close()

 width, height = mat.Rows(), mat.Cols()

 matCopied := gocv.NewMat()
 mat.CopyTo(&matCopied)

 running := true

 for running {
  window.IMShow(matCopied)

  key := gocv.WaitKey(0)

  switch key {
  case int('p'):
   for i := 0; i < 10; i++ {
    gocv.Circle(&matCopied, getRandomPoint(), 3, color.RGBA{255, 0, 0, 0}, -1)
   }
  case int('l'):
   gocv.Line(&matCopied, getRandomPoint(), getRandomPoint(), color.RGBA{0, 255, 0, 0}, 3)
  case int('r'):
   gocv.Rectangle(&matCopied, getRandomRectangle(), color.RGBA{0, 0, 255, 0}, 3)
  case int('e'):
   gocv.Ellipse(&matCopied, getRandomPoint(), getRandomPoint(), rand.Float64(), 0, 360, color.RGBA{255, 255, 0, 0}, 3)
  case int('t'):
   gocv.PutText(&matCopied, "OpenCV", getRandomPoint(), gocv.FontHersheySimplex, 1, color.RGBA{0, 0, 0, 0}, 3)
  case int('c'):
   mat.CopyTo(&matCopied)
  case 27:
   running = false
  }
 }

}

func getRandomPoint() image.Point {
 return image.Point{X: rand.Intn(width), Y: rand.Intn(height)}
}

func getRandomRectangle() image.Rectangle {
 return image.Rect(rand.Intn(width), rand.Intn(height), rand.Intn(width), rand.Intn(height))
}

Execute Result