[OpenCV] Chapter01-06 Drawing 2d primitives_ markers, lines, ellipses, rectangles and text

Drawing 2d primitives_ markers, lines, ellipses, rectangles and text

Source Code

package main

import (
 "image"
 "image/color"
 "log"
 "math/rand"

 "gocv.io/x/gocv"
)

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("Drawing")
 defer window.Close()

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

 // Circle
 gocv.Circle(&mat, getRandomPoint(), 40, color.RGBA{255, 0, 0, 0}, 1)
 gocv.Circle(&mat, getRandomPoint(), 5, color.RGBA{255, 0, 0, 0}, 2)
 gocv.Circle(&mat, getRandomPoint(), 40, color.RGBA{255, 85, 85, 0}, 2)
 gocv.Circle(&mat, getRandomPoint(), 40, color.RGBA{255, 170, 170, 0}, 2)

 // Line
 gocv.Line(&mat, getRandomPoint(), getRandomPoint(), color.RGBA{0, 255, 0, 0}, 1)
 gocv.Line(&mat, getRandomPoint(), getRandomPoint(), color.RGBA{85, 255, 85, 0}, 3)
 gocv.Line(&mat, getRandomPoint(), getRandomPoint(), color.RGBA{255, 170, 170, 0}, 3)

 // ArrowLine
 gocv.ArrowedLine(&mat, getRandomPoint(), getRandomPoint(), color.RGBA{0, 0, 255, 0}, 3)

 // Rectangle
 gocv.Rectangle(&mat, getRandomRectangle(), color.RGBA{255, 255, 0, 0}, 3)

 // Ellipse
 gocv.Ellipse(&mat, getRandomPoint(), getRandomPoint(), rand.Float64(), 0, 360, color.RGBA{255, 255, 255, 0}, 3)

 // Text
 gocv.PutText(&mat, "OpenCV", getRandomPoint(), gocv.FontHersheySimplex, 1, color.RGBA{0, 0, 0, 0}, 3)

 for {
  window.IMShow(mat)

  key := window.WaitKey(3)
  if key == 27 {
   break
  }
 }
}

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