From 4e16438494df58fbd44d85a2916bd6b0f82ed9e4 Mon Sep 17 00:00:00 2001
From: tnnevol <greecenew@foxmail.com>
Date: Thu, 17 Nov 2022 23:51:34 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20#2390=20[Preview]=E7=BC=A9=E5=B0=8F?=
 =?UTF-8?q?=E5=90=8Escale=E4=B8=BA=E8=B4=9F=E5=80=BC=20(#2391)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/components/Preview/src/Functional.vue | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/components/Preview/src/Functional.vue b/src/components/Preview/src/Functional.vue
index 1c919297..2fcf7e39 100644
--- a/src/components/Preview/src/Functional.vue
+++ b/src/components/Preview/src/Functional.vue
@@ -141,8 +141,16 @@
       }
       // 缩放函数
       function scaleFunc(num: number) {
+        // 最小缩放
+        const MIN_SCALE = 0.02;
+        // 放大缩小的颗粒度
+        const GRA = 0.1;
         if (imgState.imgScale <= 0.2 && num < 0) return;
-        imgState.imgScale += num;
+        imgState.imgScale += num * GRA;
+        // scale 不能 < 0，否则图片会倒置放大
+        if (imgState.imgScale < 0) {
+          imgState.imgScale = MIN_SCALE;
+        }
       }
 
       // 旋转图片