load all fonts if there is not set any

faq_test.go

@@ -0,0 +1,27 @@
+package base64Captcha
+
+import "testing"
+
+func TestHandlerCaptchaGenerate(t *testing.T) {
+	s := DefaultMemStore
+
+	driver := &DriverString{
+		Height:          80,
+		Width:           240,
+		NoiseCount:      10,
+		ShowLineOptions: 10,
+		Length:          10,
+		Source:          "axclajsdlfkjalskjdglasdg",
+		BgColor:         nil,
+		Fonts:           nil,
+	}
+
+	c := NewCaptcha(driver, s)
+
+	id, _, err := c.Generate()
+	if err != nil {
+		t.Fatalf("some error: %s", err)
+	}
+
+	t.Logf("id: %s", id)
+}

fonts.go

@@ -49,6 +49,12 @@ func loadFontsByNames(assetFontNames []string) []*truetype.Font {
 //randFontFrom choose random font family.选择随机的字体
 func randFontFrom(fonts []*truetype.Font) *truetype.Font {
 	fontCount := len(fonts)
+
+	if fontCount == 0 {
+		//loading default fonts
+		fonts = fontsAll
+		fontCount = len(fontsAll)
+	}
 	index := rand.Intn(fontCount)
 	return fonts[index]
 }