小编给大家分享一下HTML5 Canvas如何实现图片缩放比例，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

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drawImage方法的又一变种是增加了两个用于控制图像在canvas中缩放的参数。

drawImage（图像，x，y，宽度，高度）

其中宽度和高度分别是图像在画布中显示大小。

注意：图像可能会因为大幅度的缩放而变得起杂点或者模糊。如果您的图像里面有文字，那么最好还是不要进行缩放，因为那样处理之后很可能图像里的文字就会变得无法辨认了。

图片缩放示例

说明

在这个例子里，我会用一张图片像背景一样在画布上以重复平铺开来。实现起来也很简单，只需要循环铺开通过缩放的图片即可。见下面的代码，第一层图像大小被缩放至原来的扩大，50x38像素。为循环是做行重复，第二层是做列重复的。

注：此例中的各个图片之间还有一定的间隙，目前还不知道如何去掉。

代码

< html >

  <头>

  < meta http-equiv = “ Content-Type” content = “ text / html; charset = utf-8” />    

<！-[如果是IE]>

基本 文件 流程 错误 SQL 调试

1. 请求信息 : 2026-06-07 12:22:44 HTTP/1.1 GET : /article/gigopg.html
2. 运行时间 : 1.7801s ( Load:0.0064s Init:1.1920s Exec:0.5727s Template:0.0091s )
3. 吞吐率 : 0.56req/s
4. 内存开销 : 2,222.59 kb
5. 查询信息 : 12 queries 5 writes
6. 文件加载 : 36
7. 缓存信息 : 0 gets 0 writes
8. 配置加载 : 130
9. 会话信息 : SESSION_ID=9ev6jcn6vcanods0dbb449c5i3

1. /www/wwwroot/tsicrk.com/index.php ( 1.09 KB )
2. /www/wwwroot/tsicrk.com/ThinkPHP/ThinkPHP.php ( 4.61 KB )
3. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )
4. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )
5. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )
6. /www/wwwroot/tsicrk.com/ThinkPHP/Mode/common.php ( 2.82 KB )
7. /www/wwwroot/tsicrk.com/ThinkPHP/Common/functions.php ( 53.56 KB )
8. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )
9. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )
10. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )
11. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )
12. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )
13. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )
14. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )
15. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )
16. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )
17. /www/wwwroot/tsicrk.com/ThinkPHP/Conf/convention.php ( 11.15 KB )
18. /www/wwwroot/tsicrk.com/App/Common/Conf/config.php ( 2.14 KB )
19. /www/wwwroot/tsicrk.com/ThinkPHP/Lang/zh-cn.php ( 2.55 KB )
20. /www/wwwroot/tsicrk.com/ThinkPHP/Conf/debug.php ( 1.49 KB )
21. /www/wwwroot/tsicrk.com/App/Home/Conf/config.php ( 0.31 KB )
22. /www/wwwroot/tsicrk.com/App/Home/Common/function.php ( 3.33 KB )
23. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )
24. /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php ( 6.02 KB )
25. /www/wwwroot/tsicrk.com/App/Home/Controller/CommController.class.php ( 1.60 KB )
26. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )
27. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )
28. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )
29. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )
30. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )
31. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )
32. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )
33. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )
34. /www/wwwroot/tsicrk.com/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 17.71 KB )
35. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )
36. /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )

1. [ app_init ] --START--
2. Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ]
3. [ app_init ] --END-- [ RunTime:0.000025s ]
4. [ app_begin ] --START--
5. Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000271s ]
6. [ app_begin ] --END-- [ RunTime:0.000288s ]
7. [ view_parse ] --START--
8. [ template_filter ] --START--
9. Run Behavior\ContentReplaceBehavior [ RunTime:0.000049s ]
10. [ template_filter ] --END-- [ RunTime:0.000069s ]
11. Run Behavior\ParseTemplateBehavior [ RunTime:0.006129s ]
12. [ view_parse ] --END-- [ RunTime:0.006153s ]
13. [ view_filter ] --START--
14. Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000153s ]
15. [ view_filter ] --END-- [ RunTime:0.000167s ]
16. [ app_end ] --START--

1. 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
2. 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
3. 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= )
4. [8] Undefined index: pid /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php 第 47 行.
5. [8] Undefined index: db_host /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 120 行.
6. [8] Undefined index: db_port /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 121 行.
7. [8] Undefined index: db_name /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 122 行.

1.7801s