refactor: 优化 LastDiffToImage 函数，动态调整背景图大小以适应头像和文本，提升图像生成效果

service/beatleader/model.go

@@ -6,6 +6,7 @@ import (
 	"image/color"
 	"image/draw"
 	"log"
+	"math"
 	"os"
 	"strings"
 	"time"
@@ -542,14 +543,7 @@ func (p PlayerDataLite) LastDiffToImage(lastDayQueryData PlayerDataLite) string
 	// }
 
 	baseboard := sprite.NewNamedSpriteBoard()
-	background := image.NewRGBA(image.Rect(0, 0, 500, 1000))
+
-	draw.Draw(background, background.Bounds(), image.White, image.Point{}, draw.Src)
-	backgroundSpirit := sprite.Sprite{
-		Name:  "background",
-		Image: background,
-		Index: 0,
-	}
-	baseboard.AddSprite(&backgroundSpirit)
 	avatar, err := util.ResizeImageByMaxHeight2Image(filePath, 20)
 	if err != nil {
 		log.Default().Printf("缩放头像失败，url:%s,err:%v", p.Avatar, err)
@@ -621,10 +615,22 @@ func (p PlayerDataLite) LastDiffToImage(lastDayQueryData PlayerDataLite) string
 		Name:     "text",
 		Image:    textImg,
 		Index:    2,
-		Position: image.Point{X: 23, Y: 23},
+		Position: image.Point{X: 23, Y: 0},
 	}
 	baseboard.AddSprite(&textSpirit)
 
+	totalWidth := textImg.Bounds().Dx() + avatar.Bounds().Dx()
+	totalHeight := math.Max(float64(textImg.Bounds().Dy()), float64(avatar.Bounds().Dy()))
+
+	background := image.NewRGBA(image.Rect(0, 0, int(totalWidth), int(totalHeight)))
+	draw.Draw(background, background.Bounds(), image.White, image.Point{}, draw.Src)
+	backgroundSpirit := sprite.Sprite{
+		Name:  "background",
+		Image: background,
+		Index: 0,
+	}
+	baseboard.AddSprite(&backgroundSpirit)
+
 	if err := baseboard.SaveToPng(util.GenTempFilePath("cbl.png")); err != nil {
 		log.Default().Printf("保存图片失败，err:%v", err)
 	}