cocos2d-x getBoundingBox getContentSize getTextureRect 解释

发布时间：2020-12-14 19:12:39 所属栏目：百科来源：网络整理

导读：这是cocos2d-x代码看注释的解释翻译的不到之处谅解后面在总结 getBoundingBox // 返回一个AABB(axis-aligned bounding-box)在其父母的坐标系统。Returns an AABB (axis-aligned bounding-box) in its parent's coordinate system. getContentSize //节点容

这是cocos2d-x代码看注释的解释翻译的不到之处谅解后面在总结
getBoundingBox // 返回一个AABB(axis-aligned bounding-box)在其父母的坐标系统。Returns an AABB (axis-aligned bounding-box) in its parent's coordinate system.
getContentSize //节点容量大小
getTextureRect //返回精灵矩形的点

例子1
{
图片 Icon-48.png 这种图片 48 × 48 pixels 标准icon中得一个
Sprite *pSpBox=Sprite::create("Icon-48.png");
pSpBox->setPosition(Vec2(m_pWinSize.width*0.5,m_pWinSize.height*0.5));
pSpBox->setScale(0.2f);
addChild(pSpBox);
{
CCLOG(" A");
Rectrect=pSpBox-> getBoundingBox();
Sizesize=pSpBox-> getContentSize();
Rectsizea=pSpBox-> getTextureRect();
CCLOG(" BoundingBox(%f,%f,%f)",rect.origin.x,rect.origin.y,rect.size.width,rect.size.height);
CCLOG(" ContentSize(%f,size.width,size.height);
CCLOG(" TextureRect(%f,sizea.origin.x,sizea.origin.y,sizea.size.width,sizea.size.height);
}
pSpBox->setScale(0.5f);
{
CCLOG("B");
Rectrect=pSpBox-> getBoundingBox();
Sizesize=pSpBox-> getContentSize();
Rectsizea=pSpBox-> getTextureRect();
CCLOG(" BoundingBox(%f,rect.size.height);
CCLOG(" ContentSize(%f,size.height);
CCLOG(" TextureRect(%f,sizea.size.height);
}

cocos2d: A
cocos2d: BoundingBox(475.200012,315.200012,9.600006,9.600006)
cocos2d: ContentSize(48.000000,48.000000)
cocos2d: TextureRect(0.000000,0.000000,48.000000,48.000000)
cocos2d: B
cocos2d: BoundingBox(468.000000,308.000000,24.000000,24.000000)
cocos2d: ContentSize(48.000000,48.000000)
}

例子2
{

图片 Icon-48.png 这种图片 48 × 48 pixels 标准icon中得一个

SpriteFrameCache::getInstance()->addSpriteFramesWithFile("haohaoxuexi.plist");//把现有的icon图片整到一个大图中测试
Sprite *pSpBox=Sprite::createWithSpriteFrameName("Icon-48.png");//create("Icon-48.png");
pSpBox->setPosition(Vec2(m_pWinSize.width*0.5,m_pWinSize.height*0.5));
pSpBox->setScale(0.2f);
addChild(pSpBox);

{
CCLOG(" A");
Rectrect=pSpBox-> getBoundingBox();
Sizesize=pSpBox-> getContentSize();
Rectsizea=pSpBox-> getTextureRect();
CCLOG(" BoundingBox(%f,sizea.size.height);
}
pSpBox->setScale(0.5f);
{
CCLOG(" B");
Rect rect=pSpBox-> getBoundingBox();
Size size=pSpBox-> getContentSize();
Rect sizea=pSpBox-> getTextureRect();
CCLOG(" BoundingBox(%f,sizea.size.height);
}
//输出结果
cocos2d: A
cocos2d: BoundingBox(475.200012,9.600006)
cocos2d: ContentSize(48.000000,48.000000)
cocos2d: TextureRect(447.000000,1616.000000,48.000000)
cocos2d: B
cocos2d: BoundingBox(468.000000,24.000000)
cocos2d: ContentSize(48.000000,48.000000)

//"haohaoxuexi.plist" 中图片Icon-48.png 数据做参考
<key>Icon-48.png</key>
<dict>
<key>frame</key>
<string>{{447,1616},{48,48}}</string>
<key>offset</key>
<string>{0,0}</string>
<key>rotated</key>
<false/>
<key>sourceColorRect</key>
<string>{{0,0},48}}</string>
<key>sourceSize</key>
<string>{48,48}</string>
</dict>
}

应该都知道什么意思了，还是总结一下吧

getBoundingBox 中得 Size.width .height 显示图片真实大小 (考虑缩放和不缩放)
getContentSize 纹理图片大小
getTextureRect 当前的纹理在总纹理的位置 (不考虑缩放不缩放)

图片有缩放就用 getBoundingBox ，不考虑缩放用 getContentSize
看需求用哪个？

getBoundingBox 中得 origin.x .y 本人也不知道什么意思，打印出来没有看懂。前做这点解释，知道后在更新

（编辑：李大同）

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