《Cocos2d-x游戏开发实战精解》学习笔记2--在Cocos2d-x中显示一行文字 - andyou - 博客园
&在Cocos2d-x中要显示文字就需要用到Label控件。在3.x版本的Cocos2d中，舍弃了之前版本所使用的LabelTTF、LabelAtlas、LabelBMFont 3个用于显示文字的类，而使用一个新类Label取代。可想而知，Label实际上就是对之前3个类进行重新封装并统一渲染。
提示：实际上老版本的内容在3.x版本中依然是可以使用的。
下面是在Cocos2d-x中显示文字的一个例子，具体完整项目可在源文件本章目录下找到项目ChapterThree01查看。
【范例3-1&在Cocos2d-x中显示文字】
auto label1 = Label::create("this is the first label","Arial",36,
Size::ZERO,TextHAlignment::LEFT,TextVAlignment::TOP);
//创建标签
label1-&setPosition(210, 310);
//设置标签位置
addChild(label1);
//加入到场景中
//通过TTFConfig在标签中使用自定义字体
TTFConfig ttfconfig("fonts/chunkmuffinhollowwide.ttf", 36);
//创建TTFConfig对象
auto label2 = Label::createWithTTF(ttfconfig,"this is the second label");
//创建标签
label2-&setPosition(270,250);
//设置标签位置
addChild(label2);
//将标签加入到场景中
//使用createWithTTF方法创建使用自定义字体的标签
auto label3 = Label::createWithTTF("this is the third label","fonts/Marker Felt.ttf",36);
label3-&setPosition(200, 190);
addChild(label3);
//将标签加入到场景中
//为标签加入阴影和边框效果
auto label4 = Label::createWithTTF("this is the fourth label", "fonts/Marker Felt.ttf", 36);
label4-&setPosition(280,130);
//设置标签位置
label4-&enableShadow(Color4B::GREEN, Size(5, 5));
//设置阴影效果
label4-&enableOutline(Color4B::RED, 3);
//设置边框效果
addChild(label4);
//将标签加入到场景中
//创建带发光效果的标签
auto label5 = Label::createWithTTF("this is the fifth label", "fonts/Marker Felt.ttf", 36);
label5-&setPosition(200, 70);
//设置标签位置
label5-&enableGlow(Color4B::GREEN);
//设置光效
addChild(label5);
//将标签加入到场景中
运行之后的效果如图3-1所示。
图3-1&在屏幕上显示不同效果的标签
在一般情况下想要在屏幕上输出一行文字只需要按照第01~04行的方法来创建一个标签，然后再将它加入到场景中去就可以了。最简单的创建标签的方法如范例第01~02行所示，其中create方法的6个参数含义分别是：
l&&标签中所显示文字的内容
l&&标签字体
l&&标签内容字体大小
l&&标签尺寸
l&&标签中文字在横向和纵向的对齐方式
这看上去有点复杂，实在配不上&最简单&的创建方法，所以一般在使用时可以进一步简化，仅保留前3项参数，比如本范例第01行就可以改写成：
auto label1 = Label::create("this is the first label","Arial",36);
显示的文字如图3-1第一行所示，所以说在Cocos2d中显示文字是非常容易的。然而不能忘记的是，学习Cocos2d的目的主要还是为了做游戏，这样单调的文字自然是远远不能适应游戏的需要，所以就需要在标签中使用更加个性化的字体。
在Cocos2d 2.x版本中，可以使用LabelTTF类创建标签来使用TTF格式的字体，然而在Cocos2d 3.x中由于LabelTTF被取消（实际仍然可以使用），就要考虑使用其他办法来显示自定义字体。目前主要有两种方法：
l&&一种是通过TTFConfig配置来创建，如范例第06~09行所示；
l&&另一种是使用createWithTTF方法创建使用TTF字体的标签，如范例第11~13行所示。
这两种方法从本质上来说都是从资源目录下读取TTF格式的字体文件，可以在项目目录下找到Resources|fonts文件夹，将从网上下载的字体文件存放在这里。
为了让字体具有更强大的视觉冲击力，还可以给文字加入阴影和边框以及外发光的效果。如范例第17行就是给标签加入阴影，其中Color4B::GREEN是阴影的颜色而Size(5, 5)是阴影相对于文字的相对位置。第18行则是用来设置文字边框的，两个参数分别用来设置边框颜色和宽度。第23行为文字加入的外发光效果只有一个参数，那就是光效的颜色。Lamborghini recently unveiled their newest project, the Centenario. This car first enticed us at the Geneva Motor Show in March with the presentation of the 770-torque Centenario megacar, revealing a shut rooftop car yet encouraging us that an outstanding open-top Centenario Roadster would be coming soon. Most recently, the Lamborghini Centenario has gotten much more buzz since it appeared at Monterey Car Week.
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共9个车型，含35043张图片
找车&询价&购车计算
选择车型(选填)
记住该车辆信息
新车未上牌
按价格找车
扫二维码进入
查看更多车型
购车完全指南110期
说明：s5=5颗星，s4=4颗星，依此类推
14.98-16.98万元
18.98-31.69万元
39.6-57.9万元
7.78-9.48万元
9.98-15.38万元
19.98-31.58万元
21.99-34.99万元
9.28-16.38万元
17.98-26.98万元
38.34-56.7万元
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*手机号码：
*所在城市：
接收最新降价提醒
*底价将以短信的形式发送到您的手机，个人信息不会泄露给第三方
*手机号码：
*订阅信息将以短信的形式发送到您的手机，个人信息不会泄露给第三方}