bl/modules/player/controller/robot/gold_list.go

package robot

import (
	"blazing/cool"
	"blazing/modules/player/service"
	"bytes"
	"fmt"
	"time"

	"github.com/fogleman/gg"
	zero "github.com/wdvxdr1123/ZeroBot"
	"github.com/wdvxdr1123/ZeroBot/message"
)

func init() {
	zero.OnCommand("行情").
		Handle(func(ctx *zero.Ctx) {
			var msgs []string
			for _, v := range service.NewGoldListService(0).Get() {

				msgs = append(msgs, fmt.Sprintf("数量:%d 汇率:%.2f 所需金币:%.2f", v.ExchangeNum, 1/v.Rate, float64(v.ExchangeNum)*v.Rate))
			}

			// ======================
			// 生成行情图片
			// ======================
			const (
				width      = 400
				lineHeight = 24
				padding    = 15
			)
			lineCount := len(msgs)
			height := padding*2 + lineHeight*lineCount + 40

			// 创建图片
			img := gg.NewContext(width, height)
			// 背景色
			img.SetRGB255(245, 247, 250)
			img.Clear()

			// 标题
			img.SetRGB255(44, 62, 80)
			img.LoadFontFace("/opt/blazing/build/simhei.ttf", 20) // 黑体，解决中文乱码
			img.DrawString("骄阳号金豆集市行情列表", padding, 30)            //📊

			// 画内容
			img.SetRGB255(30, 30, 30)
			img.LoadFontFace("/opt/blazing/build/simhei.ttf", 16)
			for i, line := range msgs {
				y := 60 + i*lineHeight
				img.DrawString(line, padding, float64(y))
			}

			// 保存为图片到内存（不落地文件）
			var buf bytes.Buffer
			img.EncodePNG(&buf) // 👈 就是你要的这个方法！

			// ======================
			// 发送图片（zeroBot 标准方式）
			// ======================
			msg := ctx.Send(message.ImageBytes(buf.Bytes()))
			cool.Cron.AfterFunc(20*time.Second, func() {
				ctx.DeleteMessage(ctx.Event.MessageID)
				ctx.DeleteMessage(msg)
			})
		})
}