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cocos2d画图

2011-02-13 20:15:38| 分类： cocos2d | 标签： |举报 |字号大中小订阅

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－(void)drawRect:(CGRect)rect 只能在初始化时进行绘画，我这个做的是游戏，需要后期随时画图，而且画的线需要有动画效果，就是说要缓慢的画出来，而不是一蹴而就的。

kyle

2009-05-07 16:55

先subclass Layer类，把画线的动作放在draw函数中，并且利用schedule函数设定定时呼叫的函数以及呼叫间隔，在定时呼叫的函数中修改画线的终点，应该就可以达到动画效果。下面是个简单的例子：
//MyLayer.h
@interface MyLayer : Layer {
    CGPoint curpos;
    CGPoint originpos;
}

@end

//MyLayer.m

@implementation MyLayer
-(id)init{
    self = [super init];
    if(nil != self){
        curpos.x = 10.0f;
        curpos.y = 10.0f;
        originpos.x = 10.0f;
        originpos.y = 10.0f;

        [self schedule: @selector(tick:) interval:0.1];
    }
    return self;
}

-(void)tick:(ccTime)dt{
    curpos.y = curpos.y +1;
}

-(void)draw{
    glColor4f(0.8, 1.0, 0.76, 1.0);
    glLineWidth(2.0f);
    drawLine(originpos,curpos);
}

@end

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