From f794df4e6f74a2a5ff46d6f67c8d7f09e0d98456 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=A1=97=E8=A7=92=E5=B0=8F=E6=9E=97?= <1013335014@qq.com>
Date: Thu, 13 Jun 2024 19:12:24 +0800
Subject: [PATCH] =?UTF-8?q?Feat=EF=BC=9A=E6=96=B0=E5=A2=9E=E9=99=90?=
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---
 simple-mind-map/src/constants/defaultOptions.js |  4 ++++
 simple-mind-map/src/plugins/TouchEvent.js       | 16 ++++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/simple-mind-map/src/constants/defaultOptions.js b/simple-mind-map/src/constants/defaultOptions.js
index 44257b04..526665fe 100644
--- a/simple-mind-map/src/constants/defaultOptions.js
+++ b/simple-mind-map/src/constants/defaultOptions.js
@@ -323,6 +323,10 @@ export const defaultOpt = {
   // 禁止双指缩放，你仍旧可以使用api进行缩放
   // 需要注册TouchEvent插件后生效
   disableTouchZoom: false,
+  // 允许最大和最小的缩放值，百分数
+  // 传-1代表不限制
+  minTouchZoomScale: 20,
+  maxTouchZoomScale: -1,
 
   // 【Scrollbar插件】
   // 当注册了滚动条插件（Scrollbar）时，是否将思维导图限制在画布内，isLimitMindMapInCanvas不再起作用
diff --git a/simple-mind-map/src/plugins/TouchEvent.js b/simple-mind-map/src/plugins/TouchEvent.js
index 61fae73d..d13569ca 100644
--- a/simple-mind-map/src/plugins/TouchEvent.js
+++ b/simple-mind-map/src/plugins/TouchEvent.js
@@ -66,7 +66,13 @@ class TouchEvent {
       let touch = e.touches[0]
       this.dispatchMouseEvent('mousemove', touch.target, touch)
     } else if (len === 2) {
-      if (this.mindMap.opt.disableTouchZoom) return
+      let { disableTouchZoom, minTouchZoomScale, maxTouchZoomScale } =
+        this.mindMap.opt
+      if (disableTouchZoom) return
+      minTouchZoomScale =
+        minTouchZoomScale === -1 ? -Infinity : minTouchZoomScale / 100
+      maxTouchZoomScale =
+        maxTouchZoomScale === -1 ? Infinity : maxTouchZoomScale / 100
       let touch1 = e.touches[0]
       let touch2 = e.touches[1]
       let ox = touch1.clientX - touch2.clientX
@@ -101,8 +107,14 @@ class TouchEvent {
       if (Math.abs(distance - viewBefore.distance) <= 10) {
         scale = viewBefore.scale
       }
+      scale =
+        scale < minTouchZoomScale
+          ? minTouchZoomScale
+          : scale > maxTouchZoomScale
+          ? maxTouchZoomScale
+          : scale
       const ratio = 1 - scale / viewBefore.scale
-      view.scale = scale < 0.1 ? 0.1 : scale
+      view.scale = scale
       view.x =
         viewBefore.x +
         (cx - viewBefore.x) * ratio +