From 32ae474803883f4ad05d6d2e5eea1f4532f5bf07 Mon Sep 17 00:00:00 2001
From: sloop <GcsSloop@gmail.com>
Date: Fri, 12 Aug 2016 19:24:01 +0800
Subject: [PATCH] Update value compute

---
 CustomView/Advance/[10]Matrix_Method.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/CustomView/Advance/[10]Matrix_Method.md b/CustomView/Advance/[10]Matrix_Method.md
index eb819b2..727ebaa 100644
--- a/CustomView/Advance/[10]Matrix_Method.md
+++ b/CustomView/Advance/[10]Matrix_Method.md
@@ -289,6 +289,17 @@ mapRadius: 70.71068
 **3.mapRect**
 
 ``` java
+        RectF rect = new RectF(400, 400, 1000, 800);
+
+        // 构造一个matrix，x坐标缩放0.5
+        Matrix matrix = new Matrix();
+        matrix.setScale(0.5f, 1f);
+
+        Log.i(TAG, "mapRadius: "+rect.toString());
+
+        matrix.mapRect(rect);
+
+        Log.i(TAG, "mapRadius: "+rect.toString());
 ```
 
 测量矩形变换后位置。