badger/main.go

package main

import (
	"fmt"
	"image/color"
	"log"
	"math/rand"
	"path/filepath"
	"strconv"

	"github.com/fogleman/gg"
	"github.com/gin-gonic/gin"
)

const (
	backgroundImageFilename = "images/bg.png"
	radius                  = 0
)

func main() {

	r := gin.Default()
	r.GET("/ping", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"message": "pong",
		})
	})
	r.GET("/hi.png", func(c *gin.Context) {
		if err := serveFile(c); err != nil {
			fmt.Println(err.Error())
		}
	})
	log.Fatal(r.Run())
}

func serveFile(c *gin.Context) error {
	dc := gg.NewContext(100, 20)
	// todo, more programming
	// backgroundImage, err := gg.LoadImage(backgroundImageFilename)
	// if err != nil {
	// 	return fmt.Errorf("failed to load background image %w", err)
	// }
	// dc.DrawImage(backgroundImage, 0, 0)

	// margin := 10.0
	// x := margin
	// y := margin
	// w := float64(dc.Width()) - (2.0 * margin)
	// h := float64(dc.Height()) - (2.0 * margin)
	dc.SetColor(color.RGBA{90, 90, 90, 255})
	dc.DrawRoundedRectangle(0, 0, float64(dc.Width()), float64(dc.Height()), radius)
	dc.Fill()

	//green
	dc.SetColor(color.RGBA{49, 197, 83, 255})
	labelStartX := float64(dc.Width()) * (1 - 0.618)
	dc.DrawRectangle(0, 0, labelStartX, float64(dc.Height()))
	dc.Fill()

	fontPath := filepath.Join("fonts", "SourceCodePro-Regular.ttf")
	if err := dc.LoadFontFace(fontPath, 14); err != nil {
		return fmt.Errorf("load font %w", err)
	}

	dc.SetColor(color.RGBA{255, 255, 255, 255})

	// label
	text := "Hi"
	marginX := 5.0
	marginY := -5.0
	_, textHeight := dc.MeasureString(text)

	y := float64(dc.Height()) - textHeight - marginY

	dc.DrawString(text, marginX, y)

	// value
	valueText := strconv.Itoa(rand.Intn(1000))
	valueWidth, valueHeight := dc.MeasureString(valueText)
	fmt.Println(valueWidth, valueHeight)
	dc.DrawString(valueText, float64(dc.Width())-valueWidth-marginX, float64(dc.Height())-valueHeight-marginY)
	w := c.Writer
	c.Status(200)
	w.Header().Set("Content-Type", "image/png")
	return dc.EncodePNG(w)
}