xcode cocos2d 创建一个圆形并将其用作精灵
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cocos2d create a circle shape and use it as a sprite
提问by greg rock
so I would like to create a circle shape with primitives on cocos2d and then use it as a sprite, How can I do it please ? I know that I have to use something like this :
所以我想在 cocos2d 上用图元创建一个圆形，然后将它用作精灵，我该怎么做？我知道我必须使用这样的东西：
glLineWidth(16);
glColor4ub(0, 255, 0, 255);
drawCircle( ccp(s.width/2, s.height/2), 100, 0, 10, NO);
But it's hard for me to understand how it works and How to use it as a sprite
glLineWidth(16);
glColor4ub(0, 255, 0, 255);
drawCircle( ccp(s.width/2, s.height/2), 100, 0, 10, NO);
但是我很难理解它是如何工作的以及如何将它用作精灵
回答by Morion
do you really need CCSprite instance? you can create a subclass of CCNode, then in its
你真的需要 CCSprite 实例吗？你可以创建一个 CCNode 的子类，然后在它的
- (void) draw
method put your code there. your circle will have it's center position (0.f, 0.f)
方法把你的代码放在那里。你的圆圈将有它的中心位置 (0.f, 0.f)
@implementation MyScene
- (void) onEnter
{
[super onEnter];
CCNode* myNode = [MyNodeSubclass node];
[node setPosition: someRandomPosition ];
[self addChild: node];
}
@end
@implementation MyNodeSubclass
- (void) draw
{
glColor4f(255, 255, 255, 255);
CCPoint center = ccp(0.f, 0.f);
CGFloat radius = 10.f;
CGFloat angle = 0.f;
NSInteger segments = 10;
BOOL drawLineToCenter = YES;
ccDrawCircle(center, radius, angle, segments, drawLineToCenter);
}
@end
wrote this piece of code right here, didn't copy from xcode, but it should work as you want. ccDrawCircle is a cocos2d function, declared in CCDrawingPrimitives.h
在这里写了这段代码，不是从 xcode 复制的，但它应该可以正常工作。ccDrawCircle 是一个 cocos2d 函数，在 CCDrawingPrimitives.h 中声明
